# Spillmark Review Geo holdout testing and profit analytics for Amazon sellers running Meta ads, no data scientist required. ## Editor's Score: 68/100 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 - 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. ## Cons - 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. ## Pricing Freemium. A free tier is available. - Free: Free - Standard: $49/mo - Enterprise: $199/mo Pricing reflects what we saw at the time of review (2026-11). Confirm current pricing on the official site. Category: AI Marketing Tools (https://aitoolseekers.com/category/ai-marketing-tools) Official site: https://spillmark.com/alternatives Last verified by a human: 2026-11-06 Reviewed by a human at AI Tool Seekers, a hand-reviewed AI tools directory. Every listed tool is verified by a person before publishing. Scores are editorial opinions from a fixed rubric (capability, ease of use, value, delivery on promise) and cannot be bought; there is no pay-to-rank. Directory: https://aitoolseekers.com This review: https://aitoolseekers.com/tools/spillmark Methodology: https://aitoolseekers.com/how-verification-works ## Verdict 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. Best for: Amazon sellers running Meta ads who want causal sales measurement without hiring a data scientist. Not for: Sellers advertising only on Amazon, or anyone needing multi-channel attribution beyond Meta and Amazon. ## Overview Spillmark is a measurement tool built specifically for Amazon sellers who run Meta ads and want to know whether those ads cause real Amazon orders, not just attributed clicks. Its core method is the geo holdout test: Meta ads pause in a selected group of US states while running everywhere else, and Spillmark compares sales across the two groups to estimate the lift your ads actually caused. The result is reported as a range, locked before the test starts, which prevents post-hoc result shopping. The free profit dashboard pulls data from Seller Central, Amazon Ads, Meta, and Shopify to show profit by channel after Amazon fees, product costs, and ad spend. That math-transparent dashboard is the entry point; the geo holdout test is the paid feature that answers the harder question of whether Meta spend is worth it at all. Spillmark positions itself explicitly against two incumbent approaches: Meta's own GeoLift R package, which requires a data scientist to run, and Amazon Attribution, which tracks tagged clicks rather than caused orders. The pitch is that Spillmark delivers GeoLift-style rigor without the R dependency, and incrementality measurement that Amazon Attribution cannot provide. That is a defensible claim methodologically, though the tool's scope is deliberately narrow. At $49/month for Standard and $199/month for Enterprise, Spillmark is priced modestly relative to enterprise incrementality platforms, but it is also far more limited in scope. It is a single-question tool: did my Meta ads drive Amazon sales? Sellers who need broader answers will hit that ceiling quickly. ## Who should use it 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. ## FAQ Q: Does Spillmark have a free plan? A: 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. Q: How long does a geo holdout test take? A: 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. Q: Does Spillmark work for sellers who only advertise on Amazon Sponsored Products? A: 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. Q: What is the difference between Spillmark and Amazon Attribution? A: 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. Q: What does the Enterprise plan at $199/month include beyond Standard? A: 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. Q: Will Spillmark make changes to my ad accounts automatically? A: 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.