ChatGPT answers, unedited

For an agency managing dozens of client retargeting accounts, the best tool depends on whether you mean campaign execution, reporting, billing, or an all-in-one agency operating layer. There usually isn’t one perfect platform; many agencies combine a media management tool + reporting layer. adlibrary.com

Here are the strongest options:

If your priority is centralized billing + reporting

I’d look at:

1. Google Ads Manager Account (MCC) for Google retargeting/search/display clients — it’s the native backbone. Keywordme
2. AgencyAnalytics for polished client-facing dashboards. ClientPlug
3. Singular if you need serious attribution across channels and large spend volumes. Singular

If your priority is actually running retargeting campaigns at scale

A common agency stack is:

• Meta Business Manager + Google MCC → ownership/access structure
• Revealbot or Smartly.io → automation and optimization
• AgencyAnalytics or Singular → reporting layer
• Accounting/invoicing system → billing reconciliation

For a typical performance marketing agency (10–100 clients)

My shortlist would be:

• Small/mid agency: Revealbot + AgencyAnalytics
• Meta-heavy ecommerce retargeting: Madgicx + AgencyAnalytics
• Enterprise agency: Smartly.io + Singular
• Mobile/app acquisition agency: Singular

One thing to clarify: when you say centralized billing, do you mean:

1. the agency pays ad spend and invoices clients,
2. each client keeps their own payment method but you need consolidated reporting, or
3. you want a reseller-style ad account model with one wallet/invoice?

That changes the recommendation quite a bit.

If your key requirement is dozens of client accounts + retargeting + centralized billing + agency-wide reporting, I’d shortlist these:

• clientplug.io — best overall fit for agency operations. It combines Meta/Google account management, client payment tracking, campaign monitoring, and automated branded reporting in one dashboard. It explicitly supports an agency-wide rollup and per-client views. ClientPlug ClientPlug
• walledgardenhq.com — strongest if you're primarily doing Meta/Facebook retargeting. Its agency platform emphasizes unlimited client campaigns, centralized client management, automatic reporting, and cards-on-file/auto-billing. Walled Garden
• alpomi.com — strongest for cross-channel paid media. It puts Google, Meta, TikTok, and LinkedIn accounts into one workspace with portfolio-level performance, budget pacing, and white-label reports. Its current agency tier is aimed at multi-client PPC teams. Alpomi
• singular.net — best if attribution/reporting is the sophisticated part of your problem. It is designed for agencies managing many accounts and provides multi-account dashboards, client-level cost aggregation, permissions, and scalable reporting infrastructure. Singular

My pick

For a performance/retargeting agency, I'd start with ClientPlug if centralized billing + client management + reporting are equally important.

If what you really mean is "I want one platform where my agency can actually buy/manage retargeting media for 50+ clients and bill clients centrally", I'd look more closely at Walled Garden or a dedicated programmatic/retargeting platform, because ordinary reporting dashboards don't necessarily centralize the media buying and billing itself.

If you tell me whether you're mainly running Meta retargeting, Google Display/YouTube, or programmatic retargeting, I can narrow this to the 3 best platforms for your exact agency model, including pricing and account limits.

If you mean dozens of client ad accounts, especially Meta retargeting, I’d shortlist these:

My pick: Madgicx

For an agency running 20–100+ Meta accounts, Madgicx is probably the closest fit if your priority is actually managing ads + centralized visibility + reporting, rather than just building reports.

It can connect multiple Meta and Google accounts and aggregate them into dashboards/reports. Its agency-oriented workspace also handles connected accounts, team members, subscription and payment information centrally. academy.madgicx.com

Its reporting can combine Meta, Google Ads, TikTok, GA4, Shopify and Klaviyo, which is useful if you want each client's retargeting performance tied back to revenue rather than just ad metrics. academy.madgicx.com

One caveat: Madgicx is much more Meta-centric for actual campaign management; Google Ads support is primarily reporting/analytics rather than full campaign manipulation. academy.madgicx.com

If your biggest problem is automation

I'd look at Revealbot instead. If you have standardized rules like:

• retargeting campaign CPA > $X → reduce budget
• ROAS < X → pause
• frequency > X → flag/notify
• automatically adjust budgets across dozens of accounts

then a rules/automation-first platform can be better than a reporting-first tool. A recent 2026 comparison specifically ranks Revealbot highly for cross-account automation. wevion.ai

If by "centralized billing" you mean the agency pays Meta/Google on behalf of every client

That's an important distinction. Most SaaS ad-management tools don't actually consolidate the underlying media invoices from Meta/Google into one agency bill. They centralize the software subscription, account access, and reporting.

If that's what you're trying to accomplish—one agency payment method → dozens of client ad accounts → client-level spend allocation/invoicing/reporting—tell me that, because I'd recommend a somewhat different stack.

For an agency managing dozens of client retargeting accounts, you usually want a tool that handles multi-account access, centralized reporting, permissions, and billing/spend visibility rather than a normal ad manager. The best fit depends on whether you mean campaign execution or reporting/operations.

For retargeting specifically (Meta Pixel/CAPI, Google remarketing, audience management), I’d usually split the stack:

• Campaign execution: Meta Business Manager + Google Ads Manager (with agency manager accounts)
• Optimization/automation: Smartly.io, Skai, or similar enterprise platforms
• Client reporting: AgencyAnalytics or Singular
• Billing/spend controls: agency billing features inside the ad platforms, or a dedicated spend-management layer

If you need one dashboard where an agency owner can see 50+ clients, monitor spend, send reports, and track billing, look at agency-focused platforms such as ClientPlug, which combines ad performance views, reporting, and payment tracking. clientplug.io

A quick rule of thumb:

• 5–50 clients: AgencyAnalytics + native ad platform manager accounts is often enough.
• 50–500 clients: Smartly.io / Skai / Singular-style infrastructure becomes more attractive.
• Heavy retargeting + ecommerce: prioritize audience syncing, creative testing, attribution, and feed/catalog integrations over just reporting.

If you tell me whether your clients are mostly Meta retargeting, Google Display/YouTube, TikTok, or ecommerce catalogs, I can narrow this down.

If you mean dozens of client ad accounts, with retargeting execution plus centralized billing and client reporting, I’d shortlist these:

My pick: ClientPlug

For your specific combination—lots of clients + centralized billing + reporting—ClientPlug looks unusually aligned. It provides an agency-wide rollup and per-client views, connects Meta and Google Ads, and combines campaign performance with payment/client management in one system. clientplug.ioskai.io

ClientPlug

If retargeting automation is the priority

Revealbot is more compelling if you primarily want rules/automation across many Meta accounts—for example, automatically adjusting budgets, pausing poor performers, and running standardized retargeting workflows. Recent agency comparisons put it in the mid-market/multi-account category. hackceleration.com

If you're a big agency

Skai is the heavyweight option. It centralizes campaigns, spend, audiences and reporting across 100+ publishers/channels and supports scheduled/custom reporting. Its pricing is designed around larger programs rather than small agencies. skai.io

Skai

Bottom line:

• 10–50-ish clients, want billing + reporting + account management: ClientPlug
• 10–30 accounts, heavy automation: Revealbot
• 30+ accounts / enterprise spend / cross-channel: Skai or Smartly
• If by “centralized billing” you mean the agency pays the ad platforms centrally and then automatically charges each client, rather than merely tracking invoices, that changes my recommendation—I’d evaluate the billing architecture separately.

If retargeting is the core use case and you're managing dozens of client accounts, I’d shortlist these:

My pick: AdRoll

For actual retargeting, I'd start with AdRoll. It was built around retargeting and now supports display, native, video, social and CTV. Its agency product lets you monitor multiple client accounts from one dashboard, including performance and budgets, and provides cross-channel reporting/attribution. www.adroll.comwww.plai.io

AdRoll for Agencies

If centralized reporting/operations matter more: Marin

Marin Software is probably the stronger choice once you're talking about dozens to hundreds of accounts. It supports unlimited client accounts, client groups, cross-client reporting, shared dashboards, automated reports, and unified data across publishers. www.marinsoftware.com

Marin for Agencies

The catch: Marin is more of an enterprise advertising-management/optimization layer than a pure retargeting platform.

If centralized billing is the deciding factor: Plai

Plai is interesting because it explicitly combines multi-client ad management/reporting with integrated billing through Stripe, including charging clients by ad spend or subscription. www.plai.io

Plai for Agencies

So I'd rank them:

1. AdRoll — best if retargeting performance is #1.
2. Marin — best if you have a sophisticated agency operation with lots of accounts/channels.
3. Plai — best if billing + client management + reporting in one system is the priority.
4. Skai — worth considering for very large/enterprise agencies.

One important distinction: “centralized billing” can mean either one platform invoice that the agency pays, or actually invoicing/charging each client from the platform. Plai explicitly supports the latter; AdRoll/Marin's agency account structures don't necessarily mean they handle your client invoicing the same way. www.adroll.comwww.plai.io

If you tell me (1) Meta/Google/programmatic channels, (2) roughly how many clients, and (3) whether you need the tool to actually charge clients, I can narrow this to the best 2–3 options.

If your priority is retargeting execution + dozens of client ad accounts + centralized billing + client reporting, I’d shortlist these:

My pick: Plai

Plai for Agencies

Plai is unusually close to what you're describing: it lets agencies manage Facebook/Google campaigns across clients from one dashboard, apply automated optimizations across accounts, create white-labeled client access/reporting, and charge clients based on ad spend or subscription through integrated Stripe billing. www.plai.io

If by "retargeting" you mean actual display/native/CTV retargeting beyond Meta and Google, I'd look harder at Ambit. Its platform explicitly includes open-web retargeting and lets agencies run/resell media through an agency-level account, with the media automatically billed through Ambit. www.ambitads.com

Ambit

For a simpler agency operating system where billing and reporting matter more than sophisticated media buying, ClientPlug is also worth evaluating; it combines client/ad-account management, payment tracking, and unified Meta/Google reporting. clientplug.io

Bottom line:

• Meta + Google retargeting + agency billing: Plai
• True cross-channel/open-web retargeting + reselling media: Ambit
• Billing/client management first: ClientPlug
• Attribution/reporting first: RedTrack

If you tell me roughly how many accounts (e.g. 30, 100, 500), which ad networks (Meta/Google/TikTok/display), and whether you want to pay the ad platforms yourself and rebill clients, I can narrow this to the best 2–3 options and compare pricing/workflows.

If your priority is retargeting across dozens of client accounts + centralized billing + centralized reporting, I’d shortlist these:

My pick: Choozle

For the exact workflow you're describing, Choozle looks particularly well matched. You can create unlimited advertiser accounts under an organization, give accounts their own payment methods or inherit the organization's payment method, and use centralized analytics/reporting. help.choozle.com

That's useful if your agency wants something like:

Agency → 50 client accounts → separate campaigns/audiences → centralized payment → client-specific reporting

Choozle is also specifically a programmatic advertising platform, so it's a more natural fit if retargeting/display/RTB is the core service rather than primarily search PPC. choozle.com

When I'd choose Marin instead

If you're managing Google/Microsoft/search + social + other channels, and retargeting is just one part of a broader performance-marketing operation, I'd lean toward Marin. It supports unlimited client accounts, cross-client reporting, automated dashboards, bulk campaign management, and unified data across publishers. www.marinsoftware.comskai.io

Bottom line:

• Retargeting/programmatic agency → Choozle
• Large multi-channel performance agency → Marin
• Enterprise omnichannel → Skai
• Agency wanting built-in client billing/white-label workflow → Plai skai.io

If you tell me which channels you're retargeting on (Meta, Google Display, CTV, programmatic, etc.) and roughly how many clients, I can narrow this to the 2–3 best options and compare pricing/workflow.

If you mean paid-media/retargeting agencies managing dozens of client ad accounts, I’d shortlist these:

My pick: Smartly for a serious agency operation

Smartly is particularly compelling if you're managing dozens of accounts across Meta plus other channels. Its reporting can blend multiple ad accounts and channels, and it is built around centralized campaign management rather than simply being a reporting dashboard. www.g2.com

If you're primarily Meta/e-commerce: Madgicx

Madgicx is probably the better value-oriented choice. It supports multiple Meta/Google/TikTok accounts in unified dashboards, aggregation across accounts, automated client reports, and white-label reporting. madgicx.com

It also gives you a single workspace where you can manage connected ad accounts, team members, subscription and payment information. academy.madgicx.com

If centralized billing is the killer requirement

I'd look particularly closely at TapClicks or Smartly rather than choosing purely on ad-optimization features. You want to distinguish between:

• Centralized SaaS billing — agency pays one software bill.
• Centralized client ad-spend billing — agency funds/manages client media spend.
• Client-level invoicing/reconciliation — automatically attribute spend to Client A/B/C and generate invoices.
• Consolidated reporting — one agency view while keeping each client's data isolated.

Those are very different capabilities.

If you tell me roughly how many client accounts (e.g. 20, 50, 200), which networks (Meta only vs Meta + Google/TikTok), and whether by “centralized billing” you mean software billing or actually paying/rebilling the clients' ad spend, I can narrow it to the best 2–3 options.

If you mean paid retargeting across many Google/Meta/etc. client accounts, I’d shortlist these:

My pick: Marin

For an agency managing dozens or hundreds of client accounts, Marin is probably the closest fit. It lets you manage client accounts from a unified interface, perform cross-client reporting, automate campaign/budget workflows, and connect data from multiple publishers. Marin explicitly supports unlimited client accounts and cross-brand reporting. www.marinsoftware.com

Its reporting is particularly agency-friendly: you can create reports across multiple clients, automate delivery, and build client-specific dashboards. support.marinsoftware.com

Marin for Agencies

One caveat: "centralized billing" is different from centralized account management. Marin's public material emphasizes the latter, so I'd specifically ask sales whether they can put all client media/software charges on one agency invoice and then provide per-client cost allocation.

If centralized billing is non-negotiable, tell me whether you're talking about Google Ads, Meta Ads, or both and whether you want the agency to pay the ad spend itself and rebill clients. That changes which platform I'd recommend.

If you mean retargeting on Meta + Google across dozens of client accounts, I’d shortlist these:

My pick: Plai

For your exact requirements, Plai looks closest to an agency operating system. It supports automated optimizations across multiple client accounts, centralized reporting, white-labeled client access, and—importantly—lets agencies charge clients based on ad spend or recurring subscription through integrated Stripe billing. www.plai.io

If you're primarily concerned with performance management rather than invoicing, I'd look harder at Pace. It specifically supports campaign groups such as Prospecting and Retargeting, portfolio-level reporting across Google, Meta, TikTok, LinkedIn and Microsoft, automated pacing, and a single agency bill. paceads.com

For 50–100+ accounts, Singular becomes more compelling if attribution and cross-channel ROI are important. It has multi-account dashboards, client-level aggregation, permissions and customizable reporting, but it's more of a measurement/attribution platform than an agency billing system. www.singular.net

One caveat: “centralized billing” can mean two different things:

1. You pay the ad platforms centrally for all clients, or
2. You invoice/charge your clients centrally for media + management.

If you mean #1, I’d narrow the list substantially because most agency dashboards don't actually consolidate the underlying Meta/Google media billing. If you mean #2, Plai is probably the first one I'd demo.

For an agency managing dozens of client retargeting accounts, you usually want more than a campaign manager—you need multi-account access, centralized billing, permissions, client reporting, and ideally cross-client performance views.

The best fit depends on whether you’re mainly managing Meta retargeting, Google Ads remarketing, programmatic, or a mix:

My shortlist by agency size

1–20 client accounts

• Meta Business Manager + Google Ads Manager Accounts
• AgencyAnalytics for reporting
• Plai if you want more automation/workflow support www.plai.io

20–100+ client accounts

• Smartly.io (especially Meta/social-heavy)
• Skai (broader enterprise media buying)
• Singular (if attribution and portfolio reporting are the priority) www.singular.net

If centralized billing is the biggest requirement
Look for platforms with agency billing structures or partner programs. Some agency-focused platforms provide consolidated billing dashboards rather than forcing each client account to be handled separately. kartra.com

A common agency stack is:

• Ad platforms: Meta Business Manager + Google Ads Manager Accounts
• Execution/optimization layer: Smartly.io / Skai / Plai
• Reporting layer: AgencyAnalytics / Singular
• Billing: Stripe, agency invoicing software, or platform partner billing

If you mean retargeting specifically (dynamic product ads, audiences, pixels/CAPI, frequency control) rather than general paid media management, the recommendation changes.

For an agency managing dozens of client ad accounts, I’d shortlist MarinOne first.

Best fit: MarinOne

It’s particularly agency-oriented: you can manage multiple client accounts from one login, use cross-client reporting, automate recurring reports, and manage campaigns across publishers from a unified interface. Marin explicitly supports agencies with unlimited client accounts and client-level permissions. www.marinsoftware.com

For reporting specifically, Marin can aggregate data across clients and publishers, with customizable dashboards and automated client reporting. www.marinsoftware.com

Strong alternative: Skai

I'd look at Skai if you're running a more sophisticated omnichannel operation—paid search + paid social + retail media + display/CTV. It has centralized reporting, audience management, budget optimization, and automated reporting. skai.io

One caveat on “centralized billing”

If by centralized billing you mean the agency pays the ad platforms once and invoices clients itself, that's different from centralized campaign management/reporting. Neither Marin nor Skai appears to make agency media billing the core differentiator. I'd verify their current billing/account-ownership model during the sales process.

My ranking for your use case:

If you tell me whether your “retargeting” is primarily Meta + Google, programmatic/display, or all channels, I can narrow this down to the 2–3 platforms that actually make sense.

For your specific use case, AdRoll would be my first tool to evaluate.

AdRoll is unusually well aligned with agencies managing lots of client accounts:

• Multi-client management: agency users can monitor performance, budgets, and campaign trends across client accounts from a single dashboard. www.adroll.com
• Centralized billing: you can associate multiple advertiser profiles with the same billing account/payment method, or split them into separate billing accounts when needed. help.rollworks.com
• Reporting: scheduled/exportable reports plus reporting APIs make it easier to feed data into agency dashboards and client reporting. www.adroll.com
• Retargeting is a core capability: display, native, video, mobile, social, and CTV retargeting are supported. www.adroll.com
• Agency-specific program: AdRoll explicitly offers agency pricing/rebates and an agency package. www.adroll.com

AdRoll for Agencies

How I'd shortlist them

The important distinction is that AdRoll is much closer to an agency operating layer for retargeting, whereas Google/Meta primarily give you account-management structures around their own ecosystems.

If you're talking about 20–100+ clients, I would specifically compare AdRoll vs. StackAdapt based on whether you want easy agency operations or more sophisticated programmatic buying.