Spillmark
Geo holdout testing and profit analytics for Amazon sellers running Meta ads, no data scientist required.
Are you the maker? Claim this listing to keep info, pricing and screenshots current. Verified via your tool's domain email.
Spillmark fills a real gap for Amazon sellers who run Meta ads and want to know whether those ads actually move Amazon orders, not just clicks. Its geo holdout methodology is more rigorous than Amazon Attribution's last-click model, but the tool is narrow by design and will not help sellers who advertise only on Amazon or who need broad multi-channel attribution. If you need a general marketing analytics platform or anything beyond Meta-to-Amazon incrementality, look elsewhere.
What is Spillmark?
Spillmark is the agentic Amazon growth platform for Amazon sellers. AI agents pull your Seller Central, Amazon Ads, Meta and Shopify data, run tests, and flag problems as they happen. You review the results and approve every move. Nothing changes in your ad accounts without your approval. The free profit dashboard shows profit by channel after Amazon fees, product costs and ad spend, with the math behind every number. To find out whether Meta ads really drive Amazon sales, agents plan a geo holdout test where Meta pauses in a few US states while ads stay on everywhere else. Results show the sales your ads caused as a range, locked before the test starts. Free dashboard, Standard $49/mo, Enterprise $199/mo.
How we scored Spillmark
Capability scores 17 because Spillmark does one methodologically sound thing well (geo holdout incrementality for Meta-to-Amazon) but is genuinely limited to that single channel pair, which means any seller with a broader ad mix gets no measurement value from the paid features. Ease of use scores 19 because the tool explicitly removes the R dependency that makes GeoLift inaccessible to non-technical sellers, and the human-approval workflow keeps the interface predictable. Value scores 19 because $49/month for a rigorous incrementality test is modest relative to enterprise alternatives, and the free profit dashboard has standalone utility. Delivery scores 13 because no third-party reviews, user sentiment, or independent validation of the geo holdout results were findable, and the Enterprise tier at $199/month is not described publicly, which makes it hard to assess whether the tool delivers on its fuller promises. The absence of any corroborating evidence is not a documented failure, but it is not a confidence signal either.
Pros and cons
What we liked
- Geo holdout methodology measures caused Amazon orders rather than attributed clicks, which is a materially more honest measurement than Amazon Attribution's last-click model.
- Results are reported as a range locked before the test starts, preventing the post-hoc result manipulation that plagues self-reported ad measurement.
- Free profit dashboard with no stated time limit shows channel-level profit after Amazon fees, product costs, and ad spend, with the math exposed for every figure.
Where it falls short
- Scope is limited to Meta-to-Amazon incrementality only. Sellers running Google, TikTok, or other paid channels get no measurement value from the platform at all.
- Geo holdout tests require pausing Meta ads in selected US states, which means the test itself has a real cost in potential lost sales during the holdout period, a tradeoff the tool's marketing does not prominently address.
- Enterprise tier at $199/month is not described in detail on the public pricing page, so buyers cannot evaluate what they are paying for beyond the Standard tier without contacting the company.
Key features
Spillmark pricing
Free profit dashboard with no time limit. Standard plan at $49/month with a 7-day free trial. Enterprise plan at $199/month. All tiers include a 7-day $0 trial entry point.
| Plan | Price | Who it is for |
|---|---|---|
| Free | Free | Profit dashboard showing channel-level profit after Amazon fees, product costs, and ad spend. No stated time limit. |
| Standard | $49/mo | Geo holdout test planning and incrementality measurement for Meta-to-Amazon lift. Includes a 7-day $0 trial. |
| Enterprise | $199/mo | Higher tier with expanded capabilities not fully detailed on the public pricing page. Includes a 7-day $0 trial. |
Pricing reflects what we saw at time of review (2026-11). Always confirm current pricing on the tool's own site.
Who should use Spillmark?
Spillmark is built for Amazon sellers, particularly direct-to-consumer brands, who are spending meaningfully on Meta ads and genuinely do not know whether that spend drives Amazon revenue or just gets credit for sales that would have happened anyway. A seller spending $5,000 or more per month on Meta with a significant portion of revenue on Amazon is the clearest fit. The free profit dashboard also has standalone value for any seller who wants a single view of channel-level profitability after all Amazon fees are deducted.
Sellers who advertise exclusively through Amazon Sponsored Products, or who need attribution across Google, TikTok, Pinterest, and other channels simultaneously, should look elsewhere. Engagement Bot is a better fit if your growth priority is organic social reach and community-driven discovery rather than paid ad measurement. SmartLinks covers mobile app growth with deep linking and ASO analytics, which is a different problem entirely, but it is the closest directory alternative for sellers who need a broader growth analytics layer rather than a single-question incrementality tool.
Skip it if: Sellers advertising only on Amazon, or anyone needing multi-channel attribution beyond Meta and Amazon.
Frequently asked questions
Does Spillmark have a free plan?+
Yes. The free profit dashboard has no stated time limit and shows channel-level profit after Amazon fees, product costs, and ad spend. The geo holdout testing feature requires the Standard plan at $49/month.
How long does a geo holdout test take?+
The submitted description and pricing page do not specify a minimum test duration. The test involves pausing Meta ads in selected US states, so duration depends on the seller's sales volume and the statistical power needed to detect lift.
Does Spillmark work for sellers who only advertise on Amazon Sponsored Products?+
No. The platform is built specifically to measure whether Meta ads drive Amazon sales. Sellers who do not run Meta ads will find no measurement value in the paid features.
What is the difference between Spillmark and Amazon Attribution?+
Amazon Attribution tracks tagged clicks and credits the last click before a purchase. Spillmark uses geo holdout tests to measure caused orders, meaning it counts sales that would not have happened without the Meta ads, not just sales where a buyer happened to click an attributed link.
What does the Enterprise plan at $199/month include beyond Standard?+
The public pricing page does not detail what Enterprise adds over Standard. Buyers considering the $199/month tier should contact Spillmark directly to understand the additional scope.
Will Spillmark make changes to my ad accounts automatically?+
No. The platform's stated design requires seller approval before any change is made to ad accounts. AI agents plan and flag, but the seller approves every action.
More AI Marketing Tools
See all categoriesGet your tool listed on 300+ directories.
One listing here is a strong start. But the founders who get discovered everywhere are listed everywhere. Our sister site, Free AI Directories, submits your tool to 300+ AI directories for you, every single one by hand, by a real person.
It is a one-time payment of $49, no subscription, and you can follow along as the submissions land. Prefer the slow route? The same site keeps a free list of 450+ directories you can work through yourself.
Get my tool listed on 300+ directoriesOne-time payment, no subscription · 100% human submissions · Free list of 450+ directories included.