GoMarble is an AI agent for paid media: connect your accounts and let Agent Mode draft and execute changes — including budgets. Sentrum is a diagnosis layer that never acts without your approval, with a never-touch-budgets rule. That’s a real philosophical split, and an honest page should name it.
An honest comparison starts with what the other tool does well. These are real, verified, and genuinely useful.
A free 212K-ad library, a free AI ad analyzer, and a templates gallery — the most generous free surface in this comparison.
Hosted MCP plus open-source repos (including a 300+ star Facebook Ads MCP server) — real developer goodwill, not just marketing.
Approve-each-change agent execution is the most ambitious automation surface among these tools, for teams that genuinely want hands-off.
Hook, angle, and visual breakdowns with root-cause report templates — a solid creative-intel layer.
Meta, Google, GA4, Shopify, and a live Klaviyo connector — wider platform coverage than Sentrum’s Meta-deep focus.
Sentrum does one job: read your connected account with named statistical methods and hand you the verdict — what changed, why, what it costs, what to do. Everything below follows from that.
GoMarble’s Agent Mode changes budgets and bids (their own help docs). Sentrum never acts on its own: the only changes it can apply are ones you explicitly approve — a pause or resume, a schedule change, or a new ad created as a PAUSED draft — and a standing never-touch-budgets rule keeps budgets and bids off-limits entirely. The “will an AI tool wreck my account?” fear gets a structural answer: there is no autonomous write path.
GoMarble drafts root-cause hypotheses with LLM templates. Sentrum runs ten named statistical methods with significance gates — findings only fire above real thresholds, and every one cites its method and evidence. No “the algorithm got better,” ever.
Their reviewers call GoMarble “a reporting and creative-intel layer, not a measurement platform” and say to look elsewhere for incrementality. Sentrum ships blended MER, diminishing-returns curves, an incrementality estimator, and cannibalization detection — included, not “coming soon.”
GoMarble tiers by ad spend — $99 to $299/mo, with Pro raised $99 → $139, the free tier discontinued in Oct 2025, and tasks metered at 3–20 credits each. Sentrum is flat monthly pricing that never scales with your ad spend — your good month never raises your tool bill.
Every GoMarble cell below traces to their own published pages or verified third-party reviews, checked June 2026. If we couldn't verify a claim, it isn't here.
GoMarble figures are from gomarble.ai/pricing and their help-center Agent Mode and Feb 2026 pricing articles, accessed June 2026. Where their homepage and pricing page disagree, we used the live pricing page.
Credit where due: GoMarble publishes genuinely good content on connecting AI tools to ad accounts safely, and their free library and analyzer are real value. The structural difference stands: their agent executes budget and bid changes; Sentrum can only apply changes you explicitly approve — a pause or resume, a schedule change, or a new ad created as a PAUSED draft.
The measurement characterization is their reviewers’ language, not ours — “a reporting and creative-intel layer, not a measurement platform.”
GoMarble wants to run your account. Sentrum wants you to run it — with proof.
2 ad accounts · daily diagnostics
5 ad accounts · Ask Soren follow-ups
15 ad accounts · client-ready reports
GoMarble tiers by ad spend at $99–$299/mo with 3–20 credits per task, and discontinued its free tier in Oct 2025 (their pricing page and help docs, June 2026). Sentrum is flat monthly pricing per tier — no spend tiers.
See full pricingDifferent jobs deserve different tools. If you land in the left column, buy theirs — seriously. Plenty of teams run both.
If what you want is an AI agent that executes changes in your account — including budget and bid moves — no; that’s GoMarble’s Agent Mode, and Sentrum deliberately doesn’t do it. Sentrum is the alternative if you want the diagnosis with control kept: no autonomous execution, a standing never-touch-budgets rule, statistical verdicts you can present, and flat pricing that doesn’t climb with your spend tier.
Yes — a deliberate one. GoMarble answers the “will connecting AI tools get me banned?” fear with content and safeguards while holding write scopes. Sentrum answers it structurally: there is no autonomous write path. The only changes it can ever apply are ones you explicitly approve — a pause or resume, a schedule change, or a new ad created as a PAUSED draft — and budgets and bids can’t be touched at all. You give up one-click execution; you get an analyst that can never touch a budget, which on client accounts is the difference between a tool and a liability conversation.
Not like Agent Mode. Sentrum never drafts-and-executes: the only actions it can take are ones you explicitly approve — a pause or resume, a schedule change, or a new ad created as a PAUSED draft — and it never touches budgets or bids. For everything else it hands you the exact Ads Manager lever — and you pull it. If approve-each-change agent execution is what your workflow needs, GoMarble Max ($299/mo) genuinely offers it.
Yes — blended MER, diminishing-returns curves, an incrementality estimator, and cannibalization detection are built into the Measurement surface, fed by your Meta data plus GA4/Shopify revenue sources. GoMarble’s own reviewers describe it as “a reporting and creative-intel layer, not a measurement platform” and point users elsewhere for incrementality.
You could, but these two overlap more than most pairs on our comparison pages — both read your ad data and produce analysis. The honest split is the access model and the method: agent execution with LLM-drafted hypotheses versus approval-gated diagnosis with named statistical methods. Pick the trust model first; the rest follows.