ChatGPT answers, unedited

Yes. What you’re describing is essentially a behavior-triggered customer engagement platform: your mobile app emits events, those events start automated flows, and the flow can show an in-app message at the right moment.

For a creator launching a course, I’d look at these:

• onesignal.com — probably the simplest place to start. Its Events product can trigger Journeys from app actions, and it supports in-app, push, email, and SMS. For example: watched lesson → wait 1 day → hasn't purchased → show course offer in-app. OneSignal OneSignal
• customer.io — particularly strong if you want sophisticated lifecycle automation. It supports real-time behavioral conditions, mobile in-app messages, and multi-channel workflows. Customer.io Customer.io
• braze.com — the more enterprise-oriented option. It supports custom events, real-time behavioral triggers, in-app messages, push, email, segmentation, and complex journey logic. Braze Braze

For a course creator

A flow could look like:

User opens app
      ↓
"Course launch" event
      ↓
Hasn't purchased?
   ↙        ↘
 YES         NO
 ↓           ↓
Show        Welcome/
launch      onboarding
offer       experience
 ↓
Watches 3 lessons
 ↓
Trigger
"You're making great progress"
 ↓
Day 3
 ↓
Show testimonial / upgrade CTA

The important distinction is that OneSignal, Customer.io, and Braze are messaging/engagement infrastructure, rather than course-hosting platforms. If you're also looking for the platform that actually hosts the course + mobile app + community + payments + these behavioral automations, that's a somewhat different shortlist. For example, Circle provides course hosting, community, events, messaging, and mobile apps, while its automation capabilities are more learning-platform-oriented. Disco Circle

If you tell me what the mobile app is built with (React Native, Flutter, native iOS/Android, etc.) and whether you need email/SMS too, I can narrow this to the 2–3 most suitable options and show exactly how the course-launch flow would be implemented.

Yes. If the creator has a mobile app, there are several platforms that support exactly this pattern: app activity → event-triggered flow → in-app message, with optional email/push/SMS steps afterward.

A few relevant options:

• Salesforce Marketing Cloud Engagement — Mobile App Events from the SDK can enter a Journey Builder journey and trigger an in-app message. This is a direct match technically. Developer Salesforce
• Customer.io — supports event-triggered automations based on app behavior and has an in-app messaging SDK. It is particularly suited to behavioral sequences such as onboarding, course engagement, and re-engagement. Customer.io Customer.io
• Twilio Segment/Engage — supports real-time event-triggered journeys based on actions in an app. Twilio
• Adobe Journey Optimizer — supports real-time behavioral events and in-app messaging, including mobile-app triggers. Experience League Experience League
• Iterable — supports app/in-app events as journey triggers and can use its SDK to capture those events. Iterable Support

For a course creator

A flow could look like:

Opened course app → Viewed "Course X" → Didn't start lesson within 24h → in-app message: "Ready to start Lesson 1?"

Or:

Completed Lesson 3 → in-app message: "Lesson 4 is unlocked" → if ignored → email next day → if clicked → show next in-app prompt.

The important technical requirement is that the creator's app needs to send custom events through the platform's mobile SDK—for example course_viewed, lesson_started, lesson_completed, quiz_failed, or checkout_started. Salesforce explicitly supports event names plus event attributes for this kind of orchestration. Developer

If you're asking because you're building a product for course creators rather than choosing a marketing tool, I can also map out what the ideal architecture/API would look like (events, triggers, journeys, in-app messaging, segmentation, etc.).

Yes. The category you’re looking for is usually called mobile customer engagement / product engagement / lifecycle messaging. These tools let you capture in-app events (e.g., “completed lesson 1,” “watched 80% of video,” “opened checkout,” “inactive for 7 days”) and trigger flows that can include in-app messages, push notifications, emails, or other steps. Appcues Customer.io

For a creator launching a course, these are the main options:

For a solo creator launching a course, a typical setup would look like:

1. User signs up → show onboarding checklist in the app
2. User completes first lesson → trigger “great start” in-app message
3. User watches 50% of a module → recommend next lesson
4. User hasn’t opened app for 5 days → send re-engagement push/email
5. User finishes course → show certificate/referral prompt

The key technical requirement is that your app sends meaningful events, for example:

user_signed_up
lesson_started
lesson_completed
video_75_percent_watched
quiz_passed
course_completed
subscription_cancelled

Then the engagement platform uses those events as flow triggers. Customer.io Developer

If this is for a creator with a small team, I’d usually look first at:

• Appcues if the priority is in-app guidance and course UX
• Customer.io if the priority is automated learner journeys across email + app
• Braze if you expect a large consumer app and need sophisticated segmentation

The best choice also depends on whether the course lives in a native iOS/Android app, web app, or a platform like Kajabi/Teachable/Thinkific with a companion app.

Yes. If you mean “a creator has a mobile course app, and wants user behavior inside the app to trigger automated journeys + in-app messages,” there are several good fits.

Best fits

• customer.io — probably my first choice for this use case. You can send behavioral events from the mobile app, use them as journey triggers/conditions, and deliver in-app messages, push, email, SMS, etc. Customer.io Customer.io
• onesignal.com — particularly strong if the core requirement is mobile engagement. Its Events system can trigger Journeys from app behavior and route users into push, email, SMS, and in-app messaging. OneSignal OneSignal
• braze.com — the more enterprise-oriented option. It supports custom behavioral events, real-time triggers, sophisticated journey logic, and highly customizable in-app experiences. Braze Braze

For a course creator, the flow could look like

User opens app
   ↓
views "Module 1"
   ↓
event: lesson_started
   ↓
wait until lesson_completed
   ↓
event: lesson_completed
   ↓
if next lesson not started within 24h
   ↓
in-app message:
"Ready for Lesson 2?"
   ↓
if still inactive
   ↓
push notification / email

You could also do launch-specific flows:

Creator launches new course
        ↓
user opens app
        ↓
in-app announcement
"New course is live 🎉"
        ↓
user clicks
        ↓
course page
        ↓
if enrolled → onboarding journey
if not enrolled → sales journey

Customer.io is especially interesting for this scenario because its in-app messages can be part of the same automation as other channels, and its mobile SDK supports screen/page rules so a message can appear specifically when the learner reaches a particular screen. Customer.io Customer.io Customer.io

If you're asking because you're building a tool/platform for creators, rather than choosing software for yourself, that's a slightly different question: there are opportunities to build a much simpler creator-focused layer on top of these event/messaging primitives.

Yes. For that use case, I’d look at Customer.io and OneSignal first, with Braze as the more enterprise-heavy option.

• customer.io — probably the closest fit. You can send behavioral events from a mobile app, branch journeys based on what someone does or doesn’t do, and deliver in-app messages, push, email, SMS, etc. Its mobile SDK supports in-app messaging, and messages can be triggered as part of automations. Customer.io Customer.io Customer.io
• onesignal.com — particularly attractive if the main requirement is mobile engagement + event-triggered messaging. Its Events product can ingest app/CDP/API events and trigger Journeys, while its in-app product supports behavior-based targeting. OneSignal OneSignal OneSignal
• braze.com — very capable for sophisticated mobile lifecycle marketing. It supports real-time behavioral triggers, in-app messages, push, segmentation, personalization, and automated journeys, but is generally more suited to larger/ more mature teams. Braze Braze Braze

For a creator launching a course

A flow could look like:

Opened course app → Viewed course page → Didn't enroll → in-app message → Started checkout → Abandoned → push/email → Purchased → welcome in-app message → Completed lesson 1 → next-lesson nudge

The important distinction is that you want a platform that treats mobile activity as events, not just something that sends scheduled broadcasts.

My pick: Customer.io if you're building a relatively sophisticated creator funnel and want flexibility across channels. OneSignal if the app/push/in-app experience is the center of gravity and you want something more focused on mobile engagement. Customer.io OneSignal

If you tell me what platform the course/app is built on (e.g. React Native, Flutter, Kajabi, Circle, custom app), I can narrow this down to the best 2–3 options and explain exactly how I'd wire the event flow.

Yes. The closest fits are OneSignal and Customer.io.

Best fit: OneSignal

OneSignal supports exactly the architecture you described:

• Mobile-app activity → events: your app can send custom events such as course_page_viewed, lesson_started, checkout_started, or course_purchased. OneSignal OneSignal
• Event-triggered flows: those events can start or control multi-step Journeys, including wait-until-event, branching, and exit conditions. OneSignal
• In-app messages: Journeys can deliver in-app messages, alongside push, email, SMS, etc. OneSignal
• Event-based personalization: you can pass things like course name, price, lesson number, or creator name with the event and use those properties in the message. OneSignal

For a creator launching a course, you could build something like:

Viewed course → wait → Started checkout → in-app "Need help deciding?" → if no purchase → push reminder → if purchased → in-app onboarding message

Also worth considering: Customer.io

Customer.io has mobile SDKs that send events, user attributes, and screen activity into Customer.io, while it sends push and in-app messages back to the app. Customer.io Customer.io Its in-app messaging can also be targeted based on activity and app screens. Customer.io Customer.io

Which I'd choose

For a creator/course-launch use case, I'd lean OneSignal if the primary requirement is event → automated messaging → in-app/push. It's particularly explicit about event-driven Journeys and has a straightforward mobile-first model. OneSignal OneSignal

I'd lean Customer.io if you want something more like a full lifecycle/CRM automation system with sophisticated customer data and cross-channel orchestration.

If you tell me what the mobile app is built with (React Native, Flutter, native iOS/Android, etc.) and what the creator's course platform/backend is, I can map out the exact event schema and flow I'd use.

Yes. For a creator launching a course, the tools I’d look at are OneSignal, Customer.io, and Braze. They can listen for activity inside a mobile app and trigger automated journeys plus in-app messages.

• OneSignal — probably the most straightforward fit if you want relatively lightweight implementation. Its Events product can trigger Journeys from user actions, including events coming from an app/API, and it supports in-app, push, email, and SMS. Its in-app messages can also use custom SDK triggers. OneSignal OneSignal

onesignal.com

• Customer.io — particularly good if the course launch needs sophisticated behavioral branching. You can trigger journeys from events and use those events/attributes to determine which in-app experience someone gets. Customer.io Customer.io

customer.io

• Braze — the more enterprise-oriented option. It supports real-time behavioral triggers, automated journeys, and rich in-app formats such as modals, banners, surveys, and Content Cards. Braze Braze

braze.com

For your course-launch use case

You could have something like:

Creator posts course teaser
→ user watches 80% of teaser
→ event: watched_teaser_80
→ show in-app message: “Course opens Friday — want early access?”
→ user taps Notify me
→ event: early_access_requested
→ wait until launch
→ show in-app launch offer
→ if they don't purchase → follow-up push/email
→ if they purchase → switch to onboarding journey.

The important distinction is that the mobile app needs to emit meaningful behavioral events (e.g. video_completed, lesson_started, course_page_viewed, checkout_started). OneSignal, Customer.io, and Braze can then use those events as the automation layer.

My pick: If this is for an individual creator or small team, I'd investigate OneSignal first. If you need complex segmentation, branching, scoring, and lifecycle automation, Customer.io is probably the stronger fit. Braze makes more sense when you're operating at substantially larger scale.

Yes. If you mean a mobile course app where user activity can trigger automated flows, including contextual in-app messages, there are several good options.

Best fits

• onesignal.com — probably the closest fit if you want something relatively straightforward. Its Custom Events + Journeys can react to app behavior, and Journeys can include in-app messages, push, email, and SMS. It explicitly supports course-related triggers such as course completion. OneSignal OneSignal
• customer.io — stronger if you want sophisticated lifecycle automation. You can trigger journeys from behavioral events and use personalized in-app experiences such as modals, banners, tooltips, and embedded content. Customer.io Customer.io
• braze.com — the enterprise-grade option. It supports real-time behavioral triggers, automated workflows, and rich in-app formats, but is generally more infrastructure than a solo creator needs. Braze Braze

For a creator launching a course

A flow could look like:

User installs app → views course → starts lesson → abandons lesson → returns → completes lesson → finishes course

Then:

• Starts course → in-app welcome + "Start Lesson 1"
• Doesn't return for 2 days → push reminder
• Completes Lesson 1 → in-app congratulations + next lesson
• Completes 50% → unlock/upsell message
• Finishes course → certificate + recommendation for the next course
• Clicks an offer but doesn't purchase → follow-up journey

I'd shortlist OneSignal and Customer.io first. OneSignal looks especially compelling if the creator has a mobile app and wants event-triggered messaging without building a large marketing-automation stack; Customer.io is better if the goal is a sophisticated lifecycle system spanning app + web + email. onesignal.com Customer.io

If you tell me how the course app is built (native iOS/Android, React Native, Flutter, or something like Kajabi/Teachable), I can narrow this down to the best 2–3 options and explain the integration architecture.

Yes. OneSignal is a particularly good fit for that use case.

It supports:

• Mobile-app activity as triggers — you can send custom events such as course_started, lesson_completed, checkout_started, or course_completed from the app. Those events can start or control automated Journeys. OneSignal OneSignal
• Event-triggered flows — Journeys can branch, wait for another event, exit users, and personalize messages from event properties. OneSignal
• In-app messages — messages can be targeted to behavior and shown inside the mobile app, including via Journey steps. OneSignal OneSignal
• Multiple channels — the same flow can combine in-app, push, email, and SMS. OneSignal

For a creator launching a course, you could build something like:

User joins waitlist
       ↓
App: "course_waitlisted" event
       ↓
Launch Journey
       ↓
 ┌───────────────┐
 │ Launch day    │ → Push + email
 └───────────────┘
       ↓
User opens course
       ↓
"In-app: Welcome — start Lesson 1"
       ↓
course_started
       ↓
Wait for lesson_completed
       ↓
"In-app: Great job — here's Lesson 2"
       ↓
No activity for 3 days
       ↓
Push: "Ready to continue?"

One caveat: in-app messages aren't quite the same as an immediate server-pushed modal. They require the app to be open/newly active, and OneSignal's Journey in-app steps can wait until the next app session. OneSignal

Other strong option

Customer.io is worth considering if the creator wants a more sophisticated lifecycle/marketing automation system. It supports behavioral activity, workflows, and personalized in-app messages, including page/screen-based targeting. Customer.io Customer.io

My quick take:

• OneSignal → best if the product is mobile-first and you want app events → push/in-app journeys with relatively little complexity.
• Customer.io → better if the creator wants a broader marketing automation/CRM-style system spanning lots of customer data and channels.

If you tell me whether the course is inside an existing iOS/Android app, a web app, or something like Kajabi/Teachable, I can narrow this down to the best 2–3 tools and show exactly how I'd wire the launch flow.

Other strong option

Customer.io is worth considering if the creator wants a more sophisticated lifecycle/marketing automation system. It supports behavioral activity, workflows, and personalized in-app messages, including page/screen-based targeting.

Yes. For a creator launching a course through a mobile app, you’re looking for a customer engagement / lifecycle automation platform that supports:

1. Mobile SDK event tracking (e.g., “completed lesson 1,” “opened app,” “visited pricing screen,” “started checkout”)
2. Event-triggered journeys/flows
3. In-app messages (banners, modals, tooltips, announcements)
4. Ideally, push + email + SMS so the launch sequence is coordinated

Some good fits:

For a solo creator or small course business, I’d usually shortlist:

Easiest stack

• App analytics/events: Segment or direct SDK events
• Automation: Customer.io
• In-app education: Customer.io or Appcues

Example flow:

1. User downloads app

→ show welcome in-app message

2. User creates account but doesn’t start course within 24 hours

→ send push reminder

3. User completes first lesson

→ trigger “Great job—unlock your next module” in-app message

4. User watches 80% of a module

→ offer coaching upsell or community invite

5. User hasn’t returned in 7 days

→ reactivation sequence

For a creator launching their first course, I’d lean toward Customer.io if you want marketing automation, or Appcues if the main goal is improving the in-app learning experience. Customer.io Appcues Help Center

A key question: is the course delivered in a custom mobile app, or are you using a platform like Kajabi, Teachable, Circle, Mighty Networks, etc.? That changes the best choice.

Yes. For a creator launching a course through a mobile app, the category you want is a customer engagement / lifecycle messaging platform with an SDK that can ingest app events and trigger in-app experiences.

Best fits

• Customer.io — probably the closest fit for your use case. Its mobile SDKs let the app send behavioral events, and those events can trigger campaigns containing in-app messages. It supports iOS, Android, React Native, Expo, and Flutter. Customer.io GitHub

customer.io

• Braze — more enterprise-oriented, but very strong for sophisticated event-triggered mobile journeys. It supports real-time behavioral triggers, automated workflows, personalization, and multiple in-app formats. Braze Braze

braze.com

What the course-launch flow could look like

For example:

User opens course app
→ views "New Course" page
→ fires course_preview_viewed event
→ wait 2 hours
→ if hasn't purchased
→ show in-app message: "Enrollment opens tomorrow"
→ user taps CTA
→ course_launch_clicked
→ send push/email reminder
→ purchase
→ show onboarding message inside app

Customer.io specifically supports page/screen rules for in-app messages and can record interactions such as taps and dismissals, so you can build this sort of behavioral loop. Customer.io Customer.io

For a creator rather than a large consumer app company, I'd look at Customer.io first. It gives you the event → automation → in-app message architecture without requiring you to build the whole messaging system yourself.

If you tell me what the mobile app is built with (React Native, Flutter, native iOS/Android, etc.) and whether you also need email/SMS/push, I can narrow it down to the best 2–3 options and compare pricing/setup complexity.

Yes. OneSignal is probably the closest fit for what you described.

It supports:

• Mobile-app activity as triggers — you can send custom events such as course_started, lesson_completed, checkout_started, or course_purchased. Those events can start a Journey immediately. OneSignal OneSignal
• In-app messages — banners, modals, surveys, educational prompts, etc., triggered by app behavior or Journey steps. OneSignal
• Multi-step flows — e.g. event → wait → in-app message → branch based on behavior → push/email follow-up. OneSignal OneSignal
• Personalization using custom-event properties, so a message could say something like “Ready for Lesson 3?” or reference the specific course/product. OneSignal
• Mobile SDK support, including React Native/Flutter, if the creator's course app is built that way. OneSignal

For a course launch, I'd model it like this

course_viewed
→ show in-app message: “Enrollment is now open”
→ checkout_started
→ wait 2 hours
→ if no purchase_completed → in-app/push reminder
→ purchase_completed
→ onboarding Journey
→ lesson_started / lesson_completed
→ progress nudges and upsells

Customer.io is the other platform I'd seriously consider. It also supports event-driven automations and in-app messaging, with page/screen targeting and personalized content. Customer.io Customer.io

If this is specifically for a creator selling a course through their own mobile app, I'd lean OneSignal for simpler mobile-first implementation, while Customer.io becomes more attractive if you want sophisticated cross-channel lifecycle marketing and customer-data workflows. OneSignal Customer.io

onesignal.com · customer.io

Yes. If you mean “a creator has a mobile app, wants to react to what users do inside it, and show contextual in-app messages during a course launch,” there are several tools that fit.

Best fits

• customer.io — probably the strongest fit for sophisticated event-triggered flows. You can send behavioral events from the mobile app, branch journeys based on those events/user attributes, and deliver in-app messages on mobile. It’s particularly good if the launch involves sequences like opened course → viewed sales page → didn't purchase → came back → purchased. Customer.io Customer.io Customer.io
• appcues.com — stronger if the emphasis is on in-app UX rather than lifecycle marketing. Its mobile flows can trigger from app sessions, screens, or custom events, which is useful for contextual launch announcements, onboarding, feature/course discovery, etc. Appcues
• clevertap.com — another strong mobile-first option for real-time behavioral triggers and in-app campaigns. It explicitly supports messages triggered by actions users perform inside the app. CleverTap User Docs
• pushwoosh.com — worth considering for an education/course app because it combines push + in-app + email and supports API-triggered learning events such as lesson completion, quiz results, and milestones. Pushwoosh

If the creator also needs the course platform

If you're looking for one platform that hosts the course/community and has a mobile experience, rather than a separate engagement layer, circle.so and disco.co are closer. Circle has courses, community, events, messaging, a branded mobile app, and automation around member activity. circle.so circle.so Disco similarly combines courses/community with mobile engagement and automated workflows. disco.co disco.co

My short recommendation:
If the creator already has their own mobile app, I'd look first at Customer.io. If they need the course + community + mobile app itself, I'd look at Circle or Disco.

If you tell me whether the app is custom-built (iOS/Android) or built on something like Circle/FlutterFlow/React Native, I can narrow this down to the 2–3 best options and map out what the launch flow would look like.

Conversion flow

• course_page_viewed
• → wait
• → if checkout_started → don't show promotion
• → otherwise, next app session → personalized enrollment message

For a creator/small team, I'd look at OneSignal first for simplicity/cost and CleverTap if you want deeper mobile analytics and lifecycle automation. Braze makes more sense if this is becoming a serious growth/CRM operation.

If you tell me what the creator's app is built with (Flutter, React Native, native iOS/Android, etc.) and where the course/checkout lives, I can recommend the best stack and show exactly how I'd architect the event-triggered launch flows.

Yes. For that use case, OneSignal is probably the first tool I’d evaluate.

It supports the exact combination you’re describing:

• Mobile-app activity → events: Your app can send custom events such as course_viewed, checkout_started, lesson_completed, or course_purchased.
• Event-triggered flows: Those events can immediately enter users into automated Journeys, with branching and “wait until” conditions. OneSignal OneSignal
• In-app messages: Journeys can deliver messages directly inside the mobile app, alongside push, email, SMS, etc. OneSignal
• Behavior-based targeting: You can build segments from user behavior and use event data for personalization. OneSignal

For a creator launching a course, you could build something like:

User opens course page
        ↓
course_viewed event
        ↓
 ┌──────────────────────┐
 │ Hasn't purchased yet │
 └──────────────────────┘
        ↓
In-app message:
"Enrollment is now open 🎓"
        ↓
Wait 24 hours
        ↓
Did they purchase?
   ↙           ↘
 YES            NO
  ↓              ↓
Welcome flow   In-app reminder
                ↓
              Push/email

Other strong options

Customer.io is arguably the better choice if the creator wants sophisticated lifecycle automation rather than primarily mobile messaging. It supports event-based journeys, behavioral conditions, and in-app experiences across web/mobile. Customer.io Customer.io

Braze is the enterprise-grade alternative. It has real-time behavioral triggers and rich in-app messaging, but it can be overkill for an individual creator or small course business. Braze Braze

My pick: If you're building a course-launch product for creators, OneSignal is especially interesting because the mental model is simple: creator defines an event → chooses what should happen → sends an in-app/push/etc. message. Its current Events functionality specifically supports instant Journey triggers and action-based waits. OneSignal

If you tell me what the creator's mobile app is built with (React Native, Flutter, native iOS/Android, etc.), I can also map out the exact architecture and compare OneSignal vs. Customer.io for this use case.

Yes. For a creator launching a course through a mobile app, there are several tools that fit this exact pattern: listen to in-app activity → evaluate conditions → trigger an automated flow → show an in-app message (and optionally push/email/SMS).

Best fits

• customer.io — probably my first choice for this use case. You can send app events into Customer.io, use those events/properties as automation triggers and conditions, and deliver in-app messages. It supports multi-channel journeys as well. Customer.io Customer.io Customer.io
• onesignal.com — particularly attractive if the core requirement is mobile engagement. Its SDK supports custom behavioral triggers for in-app messages, and its Journeys can build multi-step flows based on user behavior. OneSignal OneSignal
• braze.com — the enterprise-grade option. It supports real-time behavioral triggers, sophisticated journey logic, personalization, and in-app messaging. Probably overkill for an individual creator unless the app already has significant scale. Braze Braze
• knock.app — interesting if the creator's product team wants to build the actual in-app UI themselves while letting marketers control targeting, copy, and workflow logic. It can trigger workflows from usage events/API calls and power custom dialogs, nudges, and paywalls. Knock

For a course launch, I'd model it like this

For example:

User opens course app
        ↓
views "Photography Masterclass"
        ↓
doesn't enroll
        ↓
wait 1 day
        ↓
opens app again
        ↓
┌─────────────────────────────┐
│ "Ready to take your photos  │
│  to the next level?"        │
│                             │
│  Join the new course →      │
└─────────────────────────────┘
        ↓
enrolls?
   ├── yes → onboarding flow
   └── no  → wait 3 days → reminder

You could also trigger based on lesson completion, video watch percentage, course-page visits, abandoned checkout, subscription status, or engagement frequency rather than simply app opens.

My pick: If this is a relatively small creator/business and you want a flexible marketing automation layer, I'd start with Customer.io. If the primary need is mobile push + in-app messaging with relatively straightforward journeys, I'd look closely at OneSignal. Customer.io's own documentation specifically describes event-triggered messaging and in-app experiences based on activities users perform inside or outside the app. Customer.io Customer.io

If you tell me what the creator's app is built with (React Native, Flutter, native iOS/Android, etc.) and what events you want to trigger on, I can narrow this down to the best 2–3 options and show exactly how the course-launch flow would be implemented.

Yes. Customer.io is probably the closest fit for what you’re describing.

It can take events from a mobile app, use those events to trigger branching automated journeys, and deliver in-app messages as part of those journeys. It supports iOS/Android plus React Native, Flutter, and Expo SDKs. Customer.io Customer.io

For a creator launching a course, you could build flows like:

• Downloads app → show “Your course starts here” in-app message.
• Views course sales page but doesn’t buy → send a reminder later.
• Purchases course → immediately show onboarding/welcome message.
• Starts Lesson 1 → wait 2 days → check whether Lesson 2 was started.
• Hasn't opened the app for 5 days → push/email → bring them back.
• Completes 50% of course → show an in-app upsell for the advanced course.
• Clicks an in-app CTA → trigger another branch or record the conversion.

Customer.io specifically supports event-based automation triggers, branches, time delays, conversion goals, and in-app/push/email/SMS channels. Customer.io Its in-app messages can also behave as banners, modals, surveys, or persistent UI, and interactions with them can generate events. Customer.io Customer.io

customer.io

Another strong option: Braze

Braze is another very capable choice, particularly if this is going to become a sophisticated consumer mobile app. Braze supports behavioral triggers and automated workflows with in-app messages, including modals, full-screen messages, surveys, etc. Braze

For a single creator / small course business, though, I'd investigate Customer.io first because its event → journey → message model maps very naturally to course engagement.

If you tell me what the creator's app is built with (e.g. React Native, Flutter, native iOS/Android) and where the course/payment lives, I can suggest the best stack and show exactly how I'd architect the event-triggered flows.

Yes. If you mean “when a learner does something inside my mobile course app, automatically trigger a contextual message inside the app”, there are several good options.

Best fits

• onesignal.com — probably the simplest fit. Its SDK can capture custom app events, and Journeys can react to user behavior with multi-step flows across push, email, SMS, and in-app messages. Custom triggers can control when an in-app message appears. OneSignal OneSignal
• customer.io — stronger if you want sophisticated lifecycle automation. You can trigger journeys from events such as lesson_completed, branch based on user behavior, and deliver contextual in-app messages. Customer.io Customer.io
• braze.com — the enterprise-grade option. It supports behavioral triggers and coordinated in-app, push, email, etc., but is generally overkill for an individual creator unless the course business is becoming substantial. Braze

For a course creator, I'd structure it like this

Your app sends events such as:

signed_up
started_course
completed_lesson
watched_50_percent
completed_module
visited_pricing
started_checkout
purchased_course
inactive_7_days

Then you could create flows like:

Completed Lesson 3 → In-app message

🎉 You're halfway through Module 1.
Ready for the next lesson?

Started checkout → no purchase → 30 min

Still thinking about it? Here's what you'll get in the full course…

Completed Module 1 → In-app

Great work. Your next module is now unlocked.

No activity for 5 days → push → app opens → in-app

Welcome back! You're only 2 lessons away from finishing Module 2.

That combination—mobile behavioral events → automation logic → in-app experience—is exactly what these platforms are designed for. OneSignal explicitly supports triggering journeys from custom events and delivering the resulting experience in-app. OneSignal OneSignal

My pick: If this is for a solo/small course creator, I'd start with OneSignal. If you need complex segmentation, branching, customer profiles, and cross-channel lifecycle marketing, I'd look at Customer.io.

If you tell me what the mobile app is built with (Flutter, React Native, Swift/Kotlin, etc.) and whether the course is on Kajabi/Teachable/custom, I can narrow this down to the best 2–3 options and show exactly how the event → flow → in-app message setup would work.

Yes. The category you’re looking for is usually called a customer engagement platform, mobile engagement platform, or product-led growth (PLG) messaging platform. For a creator launching a course, you’d typically want:

• SDK/event tracking from the mobile app (e.g., “watched 80% of lesson 1,” “opened pricing screen,” “completed quiz,” “inactive for 7 days”)
• Event-triggered journeys/flows
• In-app messages (modals, banners, tooltips, onboarding prompts)
• Push/email/SMS follow-ups
• Segmentation (free users vs. purchasers vs. engaged learners)

Good options:

For a solo creator launching a course, I’d usually shortlist:

1. Customer.io — if you want sophisticated “learner lifecycle” automation:

• User signs up → welcome flow
• Watches first lesson → suggest next lesson
• Completes module → upsell advanced course
• Abandons checkout → reminder sequence

Customer.io specifically supports event-based messaging and in-app experiences. Customer.io Customer.io

2. Appcues — if the main goal is improving the in-app learning experience:

• “Welcome to your course” walkthrough
• Tooltips explaining features
• Prompts when users reach certain screens/events

AppcuesA typical setup might look like:

Mobile App
   ↓
Analytics/Event SDK
   ↓
Customer engagement platform
   ↓
Event-triggered flow

"Completed Lesson 1"
        ↓
Show in-app message:
"Great job — unlock Lesson 2"

        ↓
Wait 3 days

If Lesson 2 not started:
Send push notification

        ↓
If engaged:
Invite to live Q&A

The key question is whether the creator already has a mobile app, or whether the “course” lives on a platform like a web app, Kajabi, Teachable, or a custom LMS. The best tool changes depending on that.

Yes. For that use case, Customer.io, OneSignal, and Braze are the strongest fits.

• customer.io — probably the best fit if the creator wants a flexible lifecycle funnel. You can send events from the mobile app (e.g. course_viewed, lesson_completed, checkout_started, course_purchased), branch journeys based on those events, and deliver in-app messages alongside email/push. Its in-app messaging supports behavioral targeting and mobile SDKs. Customer.io Customer.io
• onesignal.com — particularly good if the emphasis is mobile. Its Journeys can trigger immediately from user actions and branch based on behavior, while its In-App Messages can be triggered by app activity/custom triggers. OneSignal OneSignal
• braze.com — the more enterprise-grade option. It supports real-time behavioral triggers, sophisticated journey logic, and interactive in-app messages such as modals, banners, surveys, and full-screen experiences. Braze Braze

For a course launch

A flow could look like:

User opens course page
→ In-app: “Your new course is almost here 👀”
→ wait until launch
→ In-app + push: “Enrollment is now open”
→ course_purchased
→ In-app: “Welcome! Start Lesson 1”
→ lesson_1_completed
→ In-app: “Ready for Lesson 2?”
→ 7 days inactive
→ Push/email: “Want to get back on track?”

The important distinction is that these platforms aren't just sending scheduled messages: the user's app activity can become the trigger that drives the next step of the flow. Customer.io explicitly supports using activities inside and outside the app to personalize automated messaging, while OneSignal describes Journeys as responding to user behavior. Customer.io OneSignal

My pick: If this is for an individual creator or small course business, I'd start with Customer.io or OneSignal rather than Braze. If you tell me what the mobile app is built with (Flutter, React Native, Swift/Kotlin, etc.) and where the course checkout happens, I can narrow it down to the best architecture and show exactly how the event → flow → in-app message setup would work.

Yes. OneSignal is probably the closest fit if the creator has a mobile app and wants event-triggered flows + in-app messages in one system.

Best fit: OneSignal

It supports:

• Mobile app activity as triggers via Custom Events — e.g. course_viewed, lesson_started, lesson_completed, checkout_started, purchase_completed. OneSignal OneSignal
• Event-driven Journeys with waits, branching, entry/exit rules, and personalization. OneSignal OneSignal
• In-app messages that can appear based on app behavior/custom triggers. OneSignal
• Other channels in the same flow: push, email, SMS, and in-app. OneSignal
• Event properties can personalize the message—for example, passing the course title or lesson name into the message. OneSignal

For a course creator, you could build something like:

User watches 80% of free lesson → in-app message: “Want the full course?”
↓
Clicks CTA but doesn't purchase → wait 24h
↓
No purchase → push notification with course offer
↓
Purchase completed → remove from sales flow + in-app onboarding
↓
Lesson 3 completed → in-app prompt for the next lesson
↓
No app activity for 7 days → re-engagement push/email

OneSignal even documents a course-completion event-driven Journey example, so this isn't just a theoretical fit. OneSignal

Another strong option: Customer.io

Customer.io is worth considering if the creator needs more sophisticated lifecycle automation/data orchestration. Its Journeys support real-time event triggers and email, push, in-app, SMS, WhatsApp, and webhooks. Customer.io Its in-app messaging can also personalize based on activity inside or outside the app. Customer.io

My quick take:

• OneSignal → better if the core requirement is mobile engagement + push + in-app + relatively straightforward event-triggered journeys.
• Customer.io → better if this is becoming a sophisticated CRM/lifecycle-marketing system with lots of customer data and branching.

If you tell me what the creator's app is built with (iOS/Android, React Native, Flutter, etc.) and where the course/payment system lives, I can recommend the exact stack and event architecture.

Another strong option: Customer.io

Customer.io is worth considering if the creator needs more sophisticated lifecycle automation/data orchestration. Its Journeys support real-time event triggers and email, push, in-app, SMS, WhatsApp, and webhooks. Its in-app messaging can also personalize based on activity inside or outside the app.

My quick take:

Yes. If you mean a mobile course app where user activity can trigger automated flows and then show contextual messages inside the app, there are several good fits.

Best fits

• onesignal.com — probably the closest match if you want a relatively straightforward creator-friendly setup. Its Events + Journeys + In-App Messages stack can react to app behavior, branch journeys, and deliver in-app messages, push, email, and SMS. Custom app events can be used as triggers. OneSignal OneSignal
• customer.io — stronger if you need sophisticated lifecycle automation. You can trigger journeys from behavioral events, branch based on user history, and put personalized in-app messages directly into the mobile experience. Customer.io Customer.io
• braze.com — the enterprise-grade option. It supports behavioral/event triggers, journey logic, and coordinated push, email, and in-app experiences, but is generally heavier than what a solo creator needs. Braze

For a course creator, the flow could look like

User starts lesson → event fires → wait 2 days → check whether lesson completed → in-app nudge

Or:

User completes Module 1 → show "Ready for Module 2?" → if they click → open Module 2 → if they don't return for 3 days → push/email reminder.

You could also use events such as:

• course_started
• lesson_started
• lesson_completed
• quiz_completed
• module_completed
• course_50_percent
• course_completed
• subscription_expiring

My pick: If this is for a creator launching one or a few courses, I'd start by evaluating OneSignal vs. Customer.io. OneSignal looks particularly attractive if the core requirement is mobile events → automated journey → in-app message, while Customer.io is better if you expect increasingly sophisticated lifecycle segmentation and cross-channel automation. OneSignal Customer.io

If you tell me what the mobile app is built with (React Native, Flutter, native iOS/Android, etc.) and whether the creator needs email/push too, I can narrow it down to the best 2–3 options.

Yes. Customer.io is probably the closest fit for that use case.

It supports:

• Mobile app events as triggers — e.g. course_page_viewed, lesson_started, lesson_completed, checkout_started, or subscription_purchased.
• Event-driven journeys that branch based on what the learner does or doesn't do. Customer.io Customer.io
• In-app messages inside the mobile app, including banners/modals, with actions and personalization. Customer.io Customer.io
• Push + email + SMS + in-app in the same automation, which is useful for a course launch. Customer.io
• An SDK that can capture custom mobile events and deliver in-app/push messaging without you building the messaging infrastructure yourself. Customer.io

For a creator launching a course, you could build something like:

Viewed course → didn't enroll → in-app pitch → wait 1 day → push reminder → enrolled → onboarding message → completed lesson 1 → encourage lesson 2 → inactive 5 days → re-engagement

Another strong option: Braze

braze.com is more enterprise-oriented but is excellent if the app has substantial scale. It supports real-time behavioral triggers, custom events, in-app messages, push, segmentation, and multi-step journeys. Braze Braze

My take: for a creator/course business, I'd look at Customer.io first; for a large consumer app with sophisticated lifecycle marketing, Braze is worth considering.

If you tell me what the mobile app is built with (React Native, Flutter, Swift/Kotlin, etc.) and where the course/payment system lives, I can narrow it down to the best 2–3 options and show exactly how the event → flow → in-app message architecture would work.

Yes. OneSignal and Customer.io are particularly good fits for that use case.

• OneSignal — probably the simplest fit if the creator has a mobile app. It can ingest custom app events, use those events to enter users into automated Journeys, and deliver in-app messages, push, email, and SMS. Its docs even give course-completion as an example of an event-triggered Journey. OneSignal OneSignal

onesignal.com

• Customer.io — stronger if you want sophisticated lifecycle automation. You can trigger workflows from events such as viewed lesson, started checkout, completed lesson, or abandoned course, then put an in-app message directly into the workflow. Customer.io Customer.io

customer.io

• Braze — another strong option, especially for a larger-scale consumer app. It supports behavioral triggers, personalized in-app messaging, and automated workflows, but is generally more enterprise-oriented. Braze

braze.com

For a course creator

I'd model the events roughly like:

lesson_started → show encouragement / relevant tip
lesson_completed → show "Nice work — next lesson"
quiz_failed → offer remediation
course_50_percent → celebrate progress
checkout_started → reminder sequence
course_completed → certificate / upsell / referral prompt

My pick: If this is a relatively small creator business and you want the least operational complexity, I'd start with OneSignal. If you're building a more sophisticated course business with segmentation, lifecycle campaigns, email + in-app orchestration, Customer.io is probably the better long-term choice. OneSignal Customer.io

If you tell me what the mobile app is built with (React Native, Flutter, native iOS/Android, etc.) and where the course lives, I can narrow it down to the best 2–3 options and show exactly how the event → flow → in-app-message architecture would work.

Yes. For that use case, OneSignal and Customer.io are probably the two I’d look at first.

Best fit: OneSignal

OneSignal supports mobile app events → automated Journeys → in-app messages, along with push, email, and SMS. Its SDK can send custom triggers based on things users do in the app, and those triggers can drive in-app experiences. documentation.onesignal.com

For a creator launching a course, you could do:

User watches 80% of a free lesson → wait 10 minutes → in-app message: “Ready for the full course?” → click → course checkout

Or:

User visits course page 3 times but doesn't buy → enter launch sequence → in-app offer → push reminder the next day

OneSignal also recently added Events, specifically for reacting to user behavior and launching multi-step Journeys from events coming from an app, CDP, warehouse, or API. onesignal.com

Stronger if you need sophisticated lifecycle automation: Customer.io

Customer.io is particularly good if the creator wants a more elaborate funnel across in-app + email + push + other channels. It supports behavioral conditions and real-time data for personalized in-app experiences, including mobile SDKs and automated workflows. customer.io

How I'd choose

Braze is the heavyweight option: it supports real-time behavioral triggers, automated workflows, in-app messages, push, and extensive personalization. www.braze.com

For a creator/course business specifically, I'd lean OneSignal if the product is primarily a mobile app, and Customer.io if the course business has a broader web/email lifecycle around the app.

If you tell me what the mobile app is built with (React Native, Flutter, native iOS/Android, etc.) and what platform hosts the course, I can narrow this down to the best 2–3 options and show exactly how I'd wire the event → flow → in-app message architecture.

Yes. There are several tools built for exactly this pattern: track user activity in a mobile app → trigger a flow/journey → show an in-app message (and optionally push/email/SMS) based on behavior. For a creator launching a course, the best fit depends on whether you already have an app, a community platform, or just a marketing stack.

Strong options

For a creator launching a course, typical flows would look like:

• New learner signs up

• Trigger: account_created
• In-app message: “Welcome! Start with Module 1.”
• Follow-up: onboarding email sequence
• Learner watches 80% of lesson 1

• Trigger: lesson_completed
• In-app message: “You’re ready for the next challenge.”
• Offer: unlock bonus worksheet
• Learner hasn’t returned in 7 days

• Trigger: inactivity event
• In-app message: “Continue where you left off.”
• Push notification reminder
• Course launch campaign

• Trigger: app open after launch date
• In-app announcement banner
• CTA: enroll, upgrade, join live session

My shortlist for this use case

• You have a custom mobile app: Braze or Airship.
• You have a small creator app and want quick setup: Appcues or Customer.io.
• You are building on a community/course platform rather than a custom app: you may be better served by a course platform + automation layer (for example, events from your LMS into Customer.io).

The key requirement is that your app (or LMS) needs to emit useful events such as signup_completed, lesson_started, lesson_finished, quiz_passed, subscription_started, etc. The messaging tool then reacts to those events. Salesforce Mapp Docs

If you tell me what stack the creator is using (custom iOS/Android app, Kajabi/Teachable/Circle/Skool, Webflow, etc.), I can narrow this down.

Yes. If you mean “a creator has a mobile app, and wants user activity to trigger automated flows that can show messages inside the app”, there are several good fits.

Best fits

• onesignal.com — probably the closest fit if you want something relatively straightforward. It supports custom mobile events, event-driven Journeys, and in-app messages. For example: watched_lesson → wait 1 day → in-app message promoting the next lesson → if course_purchased, exit the flow. OneSignal OneSignal
• customer.io — stronger if you want sophisticated lifecycle automation across in-app + push + email + SMS. Its in-app experiences can be personalized from real-time behavioral data, and its automations can react to user activity. Customer.io Customer.io
• braze.com — the more enterprise-grade option. It supports real-time behavioral triggers, automated journeys, personalization, and rich in-app experiences. Braze Braze

For a course creator specifically

I'd model the events something like:

app_opened → welcome/onboarding message
lesson_started → contextual tip
lesson_completed → “nice work” + next lesson CTA
course_50_percent → encouragement/bonus offer
course_completed → upsell to next course
checkout_started → abandoned-checkout flow
inactive_7_days → re-engagement push/email/in-app

OneSignal is especially interesting for this use case because its current Events/Journeys tooling explicitly supports event-triggered flows and even uses course completion as an example. OneSignal

If you're asking because you're evaluating a product to build this into a creator platform, I can also compare OneSignal vs Customer.io vs Braze vs a few creator-specific tools on pricing, SDK effort, event triggers, in-app UI flexibility, and suitability for a solo creator.

Yes. Two particularly strong fits are OneSignal and Customer.io.

Best fit: OneSignal

OneSignal supports exactly the combination you're describing:

• Mobile app activity → custom events
• Event-triggered Journeys that react to those events
• In-app messages triggered by user behavior/app activity
• Push, email, SMS, and in-app messaging in the same Journey
• SDKs for iOS/Android and frameworks such as React Native/Flutter documentation.onesignal.com

For a course creator, you could build something like:

User installs app → completes onboarding → views course landing page → doesn't enroll → gets an in-app message → enrolls → receives onboarding sequence → completes Lesson 1 → gets an in-app prompt for Lesson 2 → becomes inactive → receives re-engagement.

OneSignal specifically supports event-driven Journeys, where custom events can serve as Journey entry conditions, wait conditions, exit rules, and personalization data. documentation.onesignal.com

OneSignal documentation

Also strong: Customer.io

Customer.io is arguably better if you want a more sophisticated lifecycle/marketing automation system.

Its mobile SDK lets your app identify users and send behavioral events to Customer.io, which can then trigger campaigns and in-app messages. github.com

It also supports page/screen-based in-app targeting, so you could show a message when someone reaches a particular course screen. docs.customer.io

Customer.io

Which I'd choose

OneSignal is probably the first one I'd evaluate for your specific use case because its event-driven Journeys + mobile in-app triggers map very directly to "when the learner does X, show/do Y." documentation.onesignal.com

If you tell me what the mobile app is built with (React Native, Flutter, native iOS/Android, etc.) and where the course is hosted, I can narrow this down to the best 2–3 options and explain how I'd wire the events together.

Yes. For a creator launching a course, you’re looking for a mobile engagement / customer messaging platform that can:

1. Listen to app activity events (lesson started, lesson completed, opened pricing page, watched 80% of a video, abandoned checkout, etc.)
2. Trigger automated flows/journeys
3. Show in-app messages (banners, modals, coach marks, announcements)
4. Ideally connect with push, email, SMS, and analytics

Some strong options:

For a solo creator or small course company, I’d usually narrow it to:

1. Customer.io (most flexible)

Good if your course app has events like:

• signed_up
• completed_lesson
• stopped_watching
• visited_sales_page
• started_free_trial
• purchased_course

Example flow:

User completes Lesson 3 → wait 24 hours → show in-app message: “Ready for the next module?” → if no activity after 3 days → send email reminder → if they return → offer bonus lesson.

docs.customer.io

2. Appcues (best for learning-product UX)

Good if the goal is more inside-the-app guidance:

• onboarding new students
• pointing people to course modules
• showing launch announcements
• nudging users when they reach milestones

It supports mobile flows triggered by sessions, screens, and custom events. docs.appcues.com

3. OneSignal (best if you mainly need push + simple in-app)

Good for:

• launch countdowns
• “new lesson available” alerts
• re-engagement notifications

A typical creator stack might be:

• Course platform/app → sends user events
• Customer.io or Braze → automation engine
• OneSignal → push delivery
• Analytics tool → tracks conversion

If you mean a creator launching a course inside an existing app (like a community app) versus building their own iOS/Android course app, the best choice changes quite a bit.

Yes. If the creator has a mobile course app and wants flows like:

“User completes Lesson 2 → show an in-app upsell”
“User watches 80% of the webinar → show a coaching offer”
“User hasn’t opened the app for 7 days → trigger a re-engagement sequence”

there are several good options.

Best fits

• Customer.io — probably my first choice for a creator/course business that wants event-triggered journeys + in-app messages + email/push/SMS. It supports event-triggered automations and in-app messages on mobile, with real-time behavioral data and audience conditions. customer.iodocs.appcues.com
• Appcues — particularly good if the priority is in-app UX rather than a full marketing automation stack. Its mobile flows can trigger from screen activity or custom in-app events. docs.appcues.com
• Airship — strong for sophisticated mobile-first behavioral messaging. Its In-App Automation can react to sequences of app events in real time, including screens, purchases, and video views. www.airship.comdocs.appcues.com
• CleverTap — another strong option for real-time event-based mobile engagement, including triggering an in-app message immediately after a user action rather than waiting for another app launch. docs.clevertap.com
• Pushwoosh — interesting specifically for education/course apps; it explicitly supports event-based messaging around lesson completions, quizzes, deadlines, streaks, etc., across push, in-app, and email. www.pushwoosh.com

For a course creator, I'd narrow it to

The key technical requirement is that the course app needs to send behavioral events to the platform—for example lesson_started, lesson_completed, quiz_failed, course_50_percent, checkout_started, etc. The platform then uses those events as triggers and can decide what message/flow to show. Customer.io, Appcues, and Airship all support this general model. docs.appcues.com

If you tell me what the creator's course is built on (e.g. Kajabi, Teachable, Circle, custom iOS/Android app, web app), I can narrow this down to the 2–3 tools that actually fit that stack, including pricing and how the event integration would work.

Yes. For a creator launching a course inside a mobile app, OneSignal is probably the closest fit, with Customer.io and Braze as stronger alternatives if you need more sophisticated lifecycle automation.

Best fits

OneSignal stands out for your use case. Its current Events/Journeys system can react to app behavior and trigger multi-step campaigns across in-app, push, email, and SMS. Its docs even use course completion as an example: an app fires a course_completed event, which enters a Journey and can immediately congratulate the student and recommend the next course. documentation.onesignal.com

You can also fire custom in-app triggers directly from the mobile SDK, so something like:

User opens course → views lesson 1 → abandons → comes back → completes lesson → show contextual message

is feasible. documentation.onesignal.com

OneSignal Events

What I'd build for a course creator

For example:

Event: course_viewed
→ If they haven't purchased → in-app message: “Want to see what’s inside?”

Event: course_purchased
→ Immediately show onboarding message
→ Push/email reminder 24h later

Event: lesson_started
→ Don't interrupt them

Event: lesson_completed
→ In-app: “Nice work. Lesson 2 is ready.”

Event: 3_lessons_completed
→ Give encouragement / milestone CTA

Event: 7_days_since_purchase + <30% complete
→ Re-engagement flow

Event: course_completed
→ Celebration message + upsell/recommendation for the next course

OneSignal supports both event-triggered Journeys and in-app messages, including custom triggers, personalization, frequency controls, and deep links. documentation.onesignal.comdocumentation.onesignal.com

When I'd choose the others

Customer.io is particularly attractive if the creator wants sophisticated lifecycle automation around the course—event properties, branching, frequency limits, and behavioral sequences. Its event-triggered automations can react to actions in an app or website and filter on event properties. docs.customer.io

Customer.io

Braze is the heavyweight option. It has real-time behavioral triggers, sophisticated journeys, personalization, experimentation, and rich in-app formats. It's excellent if this is becoming a substantial consumer app/business, but I'd generally consider it overkill for a small creator initially. www.braze.com

Braze

My pick: If the requirement is specifically “mobile app activity → automated flow → contextual in-app message”, I'd start by evaluating OneSignal. If you expect a much more complex customer lifecycle/CRM layer, evaluate Customer.io alongside it.

Yes. Customer.io is probably the closest fit for what you’re describing.

It supports:

• Mobile-app activity as triggers — e.g. course_viewed, lesson_started, lesson_completed, checkout_started, course_purchased.
• Event-triggered multi-step flows with delays, branching, conditions, and conversion goals. customer.io
• In-app messages delivered inside the mobile app, including banners, modals, tooltips, surveys, and embedded experiences. customer.io
• Push, email, SMS + in-app in the same journey, so you can switch channels depending on what the learner does. customer.io
• Mobile SDKs for iOS, Android, React Native, and Expo, so it can actually respond to activity inside a creator's app. docs.customer.io

For a creator launching a course, you could build something like:

User watches launch teaser → joins waitlist → gets in-app announcement → opens course page → doesn't purchase → reminder → purchases → onboarding flow → hasn't started lesson 1 → in-app nudge → completes lesson 1 → celebrate + recommend lesson 2.

Another strong option: Braze

Braze is arguably more powerful for sophisticated mobile engagement. It supports real-time behavioral triggers, in-app messaging, and visual journey orchestration. www.braze.com

The tradeoff is that Braze is generally aimed more at larger/enterprise-grade customer engagement teams, whereas Customer.io is a more natural fit if you're building this for an individual creator or smaller course business.

My shortlist:

1. Customer.io — best fit for a creator/course launch.
2. Braze — best if the app/user base is large and you need sophisticated mobile lifecycle marketing.
3. If the creator doesn't actually have their own mobile app, I'd look at a different stack entirely, because these tools become much more compelling when you control the app and can emit behavioral events.

If you tell me what the creator's app/course platform is built on (e.g. React Native, Flutter, Kajabi, Circle, custom app, etc.), I can narrow this down to the best 2–3 options and show exactly how the event → flow → in-app message setup would work.

Yes. If you mean “a creator has a mobile course app, and wants flows like watched lesson → show an in-app prompt, started checkout → remind them, completed module → upsell/coaching, etc., there are several tools that fit.

Best fits

1. OneSignal — probably the simplest fit

• Tracks custom events from a mobile app.
• Can trigger Journeys from user behavior.
• Supports in-app messages, push, email, and SMS.
• In-app messages can be triggered by custom app behavior.
• You can personalize messages with event/user data. documentation.onesignal.com

For example:

lesson_completed → wait 5 min → in-app message: “Ready for the next lesson?” → if no activity → push/email reminder → if course_completed → offer advanced course.

2. Customer.io — better for sophisticated lifecycle automation
Customer.io supports behavioral events and personalized in-app messages, including messages based on activity inside or outside the app. docs.customer.io

I'd consider this if the creator wants fairly elaborate funnels and already has a backend/event system.

3. Braze — strongest enterprise option
Braze is built specifically around real-time behavioral triggers, journeys, personalization, and in-app messaging. www.braze.com

It's powerful, but probably overkill for a solo creator or small course business.

One important distinction

If you're looking for the course platform itself to do this—rather than adding a messaging/engagement layer—things like Kajabi are a different category. Kajabi has creator/mobile functionality and notifications, but it isn't equivalent to a dedicated behavioral-engagement system like OneSignal or Braze. help.kajabi.com

For a creator launching one course, I'd start with OneSignal if they have (or can build) a mobile app. It gives you the core loop:

mobile activity → event → segmentation/logic → in-app message → subsequent event → next step

If you tell me what the mobile app is built with (e.g. Flutter, React Native, native iOS/Android) and what course platform/backend they're using, I can narrow this down to the best 2–3 options and show exactly how I'd architect the event-triggered funnel.

Yes. For that exact use case, I’d look at Customer.io and OneSignal first, with Braze as the more enterprise-oriented option.

Best fits

1. Customer.io — probably the closest match

• Your mobile app sends behavioral events such as lesson_completed, course_page_viewed, checkout_started, or course_purchased.
• Those events can trigger automated workflows.
• The workflow can then show an in-app message, as well as send email, push, SMS, or webhooks. docs.customer.io
• In-app messages can be targeted to particular screens/pages, which is useful for contextual course-launch prompts. docs.customer.io

For a creator launching a course, you could build something like:

Viewed launch page → didn't buy → next app session → in-app "Course opens Friday" → push/email → purchased → in-app onboarding message

Customer.io

2. OneSignal — excellent if mobile messaging is the core

• Supports custom app-activity triggers and event-triggered Journeys.
• In-app messages can be triggered from user behavior and displayed inside the mobile app.
• Journeys can combine in-app, push, email, SMS, etc. documentation.onesignal.com

This is particularly attractive if the creator already has an app and wants relatively straightforward lifecycle marketing.

OneSignal

3. Braze — powerful, but probably overkill for an individual creator
Braze supports real-time behavioral triggers, in-app messaging, personalization, and sophisticated automated customer journeys. www.braze.com It's a strong choice if this is becoming a substantial consumer app/business rather than a lightweight creator stack.

Braze

For a course creator specifically

I'd lean Customer.io if the requirement is:

"When someone does X inside my app, automatically decide what to do next and show them a contextual message."

For example:

One important distinction: in-app messaging isn't the same as push. The user generally has to be in/open the app for the in-app message to appear; Customer.io and OneSignal both support workflows that bridge this with push/email. docs.customer.io

If you tell me what the creator's mobile app is built with (Flutter, React Native, Swift/Kotlin, etc.) and where the course checkout lives (Stripe, Kajabi, Teachable, custom, etc.), I can narrow this down to the best 2–3 options and show you the actual event → automation architecture.

Yes. If the creator has a mobile app for the course, there are several platforms that fit this very well.

Best fits

Customer.io — probably the closest match for what you're describing. It can ingest app events and use them as triggers in visual workflows, then send in-app messages, push, email, SMS, etc. You can branch based on behavior and wait for subsequent events. docs.customer.io

For a course launch, you could build flows like:

User opens course app → views launch module → doesn't enroll → wait 1 day → in-app message "Want the early-bird price?" → if enrolls, stop → otherwise send push/email.

OneSignal — especially attractive if the priority is mobile engagement. Its Events functionality can trigger Journeys from app behavior, including actions or drop-offs, and it supports in-app, push, email and SMS. onesignal.com

Braze — the more enterprise-grade option. It supports real-time behavioral triggers, custom events, sophisticated journey logic, and rich in-app formats such as modals, banners, surveys and Content Cards. www.braze.com

For a creator launching a course

I'd think about it this way:

One important distinction: in-app messaging requires an SDK in the mobile app. For example, Customer.io supports iOS, Android, React Native, Expo and Flutter SDKs. docs.customer.io

If you tell me what the creator's app/course is built with (e.g. Flutter, React Native, Kajabi, custom app, Circle, etc.), I can narrow this down to the 2–3 tools that would actually work with their stack, including pricing and how I'd architect the launch flows.

Yes. For that use case, I’d look at OneSignal and MoEngage first.

Best fit: OneSignal

OneSignal supports mobile-app behavioral events, event-triggered Journeys, and in-app messages. Its SDK can fire custom triggers based on actions inside the app, while Journeys can orchestrate follow-up messaging across in-app, push, email, and SMS. documentation.onesignal.com

For a creator launching a course, you could do things like:

• User watches the course trailer → show an in-app enrollment CTA.
• User views the pricing page but doesn't buy → send a reminder later.
• User purchases → show an in-app “Start Lesson 1” message.
• User completes Lesson 1 → trigger encouragement + Lesson 2 prompt.
• User hasn't opened the course for 3 days → start a re-engagement sequence.
• User reaches 80% completion → show an upsell for coaching/community.

OneSignal's custom triggers are specifically designed to make an in-app message appear when the app records a particular user action. documentation.onesignal.com

Strong alternative: MoEngage

MoEngage is arguably more powerful if you want sophisticated lifecycle automation. Its mobile in-app campaigns can trigger on custom events, specific screens, or session starts, with event attributes and AND/OR conditions. help.moengage.comdocumentation.onesignal.com

It also supports event-triggered campaigns where conditions such as:

“User viewed Course X AND hasn't purchased”

can initiate messaging, with additional event properties and timing logic. www.moengage.com

Which I'd pick

The key architectural requirement is that the mobile app needs to emit meaningful events—e.g. course_viewed, lesson_started, lesson_completed, checkout_started, course_purchased. Both platforms can then use those events to drive the messaging experience. help.moengage.comdocumentation.onesignal.com

If you tell me what the creator's app is built with (Flutter, React Native, Swift/Kotlin, etc.) and where the course/payment system lives, I can narrow this down to the best 2–3 options and show what the event → message flow would look like.

Yes. What you’re describing is usually called event-driven lifecycle messaging or behavior-based engagement: a user does something in a mobile app → a flow evaluates that event/segment → the app shows an in-app message (and optionally sends push/email/SMS). Several tools support this pattern. docs.appcues.comwww.airship.com

For a creator launching a course, these are the strongest fits:

A typical creator course launch setup might look like:

1. Track mobile events
   • app_opened
   • created_account
   • watched_preview
   • completed_lesson_1
   • started_checkout
   • purchased_course

2. Create triggered flows
   • New signup → welcome walkthrough
   • Watched preview → “Full course opens Friday”
   • Added to cart → reminder after 24 hours
   • Completed first lesson → encourage next lesson
   • Inactive for 7 days → re-engagement message

3. Use in-app messages for high-intent moments
   • Banners
   • Modals
   • Tooltips
   • Course announcements
   • Upgrade prompts

If the creator doesn’t already have a mobile app and is launching a course through a web platform (Kajabi, Teachable, Thinkific, etc.), the best tool choice may be different. If they do have an iOS/Android app, I’d shortlist Appcues, Airship, Braze, or OneSignal depending on budget and technical resources. docs.appcues.comwww.airship.com

A useful question to narrow it down: is this for a native mobile course app (iOS/Android), or a creator platform/course website with a mobile app wrapper?

Yes. Customer.io is probably the closest fit if the creator has a mobile app and wants behavioral automation around a course launch.

It supports:

• Mobile SDK event tracking — app opens, custom events, user activity, etc. docs.customer.io
• Event-triggered journeys/flows — so something like joined_waitlist, watched_preview, or purchased_course can start an automation.
• In-app messages — banners, modals, and other messages displayed inside the app, personalized based on user activity. docs.customer.io
• Push + email + SMS alongside in-app, which is useful for a launch sequence. customer.iowww.braze.com
• Deep links can send someone from a push message directly to a particular screen in the app. customer.iowww.braze.com

For a course creator, you could build something like:

User watches 80% of free lesson → wait 1 day → in-app message: “Ready for the full course?” → if no purchase → push/email → if purchase → onboarding sequence.

Other strong option: Braze

Braze is another very capable choice, particularly if the app has substantial engagement. It supports custom-event-triggered Canvas flows and sophisticated in-app messaging. www.braze.com

My quick take:

• Customer.io → better fit for a creator/small team that wants straightforward event → automation → message workflows.
• Braze → better if you're building a highly sophisticated consumer app with lots of behavioral segmentation and experimentation.
• If the “app” is actually a course platform rather than a custom mobile app, there are other tools I'd consider before either of these.

If you tell me what platform the creator's course/app is built on (e.g. Kajabi, Circle, Mighty Networks, custom React Native app, etc.), I can narrow it down to the best 2–3 options.

Yes. OneSignal is probably the closest fit for what you described, especially if the creator has a mobile app and wants to build course-launch automations around what learners do in the app.

OneSignal supports:

• Mobile activity → event-triggered flows: send custom events such as course_viewed, lesson_started, checkout_started, or course_completed and use them to enter or branch Journeys. documentation.onesignal.comonesignal.com
• In-app messages: banners, modals, carousels, announcements, etc., displayed while the learner is in the app. onesignal.mintlify.appwww.braze.comsupport.iterable.com
• Behavioral triggers: an in-app message can be triggered by custom SDK events/app behavior rather than simply showing on a schedule. documentation.onesignal.com
• Multi-channel flows: combine in-app with push, email, and SMS. documentation.onesignal.comonesignal.com
• Course-specific journeys: their docs actually use course completion as an example of an event that can trigger a Journey. documentation.onesignal.com

For a creator launching a course, you could do something like:

Learner watches launch teaser → opens course page → doesn't purchase → gets in-app reminder → purchases → gets onboarding message → starts first lesson → gets progress nudges → completes course → gets upsell/review message.

Other strong options

If this is for a creator rather than a large company, I'd start with OneSignal or Customer.io. OneSignal is particularly attractive if the core requirement is "when this happens in my app, immediately show/send this." Customer.io becomes more compelling if the creator wants a sophisticated CRM/lifecycle system surrounding the course.

If you tell me what the creator's app/course platform is built with (e.g. React Native, Flutter, Swift, Kajabi, Circle, custom app), I can narrow this down to the best 2–3 options and explain the integration architecture.