GoMarble is an AI agent for paid media: connect your accounts and let Agent Mode draft and execute changes — including budgets. Sentrum is a read-only diagnosis layer 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 is read-only by architecture with a standing never-touch-budgets rule — not read-only until a write feature ships. The “will an AI tool wreck my account?” fear gets a structural answer: the write path doesn’t exist.
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 $19/$39/$79 with no credit meter — 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: they hold write scopes; Sentrum doesn’t.
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.
1 ad account · daily diagnostics
3 ad accounts · full method library
10 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 $19/$39/$79 — no spend tiers, no credit meter.
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: read-only access, 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: the write path doesn’t exist. 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.
No. Sentrum tells you what changed, why, what it costs, and the exact Ads Manager lever to pull — and then you pull it. Diagnosis is the product; execution stays yours. 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 read-only diagnosis with named statistical methods. Pick the trust model first; the rest follows.