Amplitude vs Fathom Analytics in 2026: Deep Product Behavioral Analytics vs Simple Privacy-First Web Analytics
One tracks every event in a user's lifetime timeline inside a product and starts free at 50,000 tracked users. The other tracks basic site traffic with no cookies and no consent banner, starting at $15 a month with no free tier at all.
Amplitude
Fathom Analytics- Amplitude tracks granular behavioral events for funnel and retention analysis inside a product. Fathom tracks basic site-level metrics: visitor counts, referrers, countries, and conversion events, with no behavioral timeline at all.
- Fathom requires no cookies and no consent banner under GDPR, CCPA, or PECR, and retains data forever on every plan. Amplitude uses standard event tracking and does not publish a forever-retention guarantee.
- Amplitude has a genuinely free Starter tier for up to 50,000 tracked users. Fathom has no free tier at all, only a 7-day trial before its $15/month starting price applies.
- Fathom includes 50 or more sites on every plan, making it practical for agencies managing many client properties from one account. Amplitude has no equivalent site-pack or multi-property structure.
- Amplitude includes session replay, feature experimentation, and AI Agents that automate cohort and funnel analysis. Fathom has none of these; it deliberately stays scoped to simple traffic reporting.
- Amplitude added a thin AI visibility feature tagging brand mentions in ChatGPT and Perplexity. Fathom has no AI traffic detection feature of any kind, by its own admission a gap compared to a rival like Plausible.
- Fathom is 100 percent independently owned with no VC investors. Amplitude is a publicly traded, venture-backed company with a much larger product surface area.
Amplitude and Fathom Analytics both call themselves web or product analytics, but the depth gap between them is the whole story. Amplitude builds behavioral timelines out of individual user events to answer funnel and retention questions a product team actually loses sleep over. Fathom answers a much simpler question well: how many people visited, where did they come from, and can I get that answer without a cookie banner scaring off European visitors. Neither is trying to be the other. This comparison is for anyone who has landed on both in a search for "analytics tools" and needs to know which one actually matches the question they are asking.
The tools at a glance
Amplitude
AI-powered product intelligence platform combining behavioral analytics, experimentation, and session replay
Amplitude works with behavioral events rather than the pageview-and-session model most web analytics tools use. Every user action inside a product feeds a lifetime timeline that powers funnel analysis, retention cohorts, and path analysis, letting teams answer specific questions like what separates a user who converts from one who drops off at a particular step.
The platform layers feature experimentation, session replay, and a data governance module on top of that same event data, and AI Agents, from the Growth plan, automate recurring analytical work like anomaly detection. None of this is built for simple site-traffic reporting; a team that just wants monthly visitor counts and top referrers is buying far more complexity than the question requires.
A newer, thinner feature tags brand mentions in ChatGPT and Perplexity as an early AI visibility capability, bundled into the same dashboard as behavioral analytics. Amplitude Starter is free for up to 50,000 tracked users, which is a real, usable entry point, though the deeper AI and experimentation features sit behind a Growth plan that requires a sales conversation.
| Feature | Starter Free | Plus $49/month | Growth Contact for pricing | Enterprise Contact for pricing |
|---|---|---|---|---|
| Monthly tracked users | 50K | 1K-100K | Custom | Custom |
| Session replay | ✓ | ✓ | ✓ | ✓ |
| Feature experimentation | ✗ | ✗ | ✓ | ✓ |
| AI Agents | ✗ | ✗ | ✓ | ✓ |
| Data governance | ✗ | ✓ | ✓ | ✓ |
| Warehouse connectors | ✗ | ✓ | ✓ | ✓ |
| API access | ✓ | ✓ | ✓ | ✓ |
Fathom Analytics
Simple, GDPR-compliant web analytics with cookieless tracking, forever data retention, and no consent banners.
Fathom is built around a single premise: website analytics should answer basic traffic questions without collecting cookies or personal data. A single script tag gives a dashboard of visitor counts, top pages, referrers, countries, device types, and conversion events, with no consent banner required because there is nothing to consent to.
Every plan retains data forever, a deliberate contrast to GA4's rolling data windows, and includes at least 50 sites, with additional packs of 50 available for $10 per month. That site allowance makes Fathom practical for agencies managing many client properties from a single login rather than paying per property. API access is included on every plan, not gated to an enterprise tier.
What Fathom does not do is just as defining as what it does. There is no behavioral event timeline, no session replay, no experimentation, and by its own account no built-in AI traffic detection, a feature it acknowledges a competitor like Plausible has. It is a deliberately narrow tool, built for teams that want a clean answer to "how is my site doing" without the setup overhead of a full analytics suite.
| Feature | All plans From $15/mo |
|---|---|
| Pricing model | Based on monthly page views |
| Sites included | 50+ |
| Data retention | Forever |
| API access | ✓ |
| No cookie banners required | ✓ |
| 7-day free trial | ✓ |
Head-to-head feature comparison
| Feature | Amplitude | Fathom Analytics |
|---|---|---|
| Primary use case | Product teams tracking granular in-app user behavior | Agencies and privacy-conscious teams tracking basic site traffic |
| Behavioral event funnels and retention | Yes (event-based funnels, retention, path analysis) | No (no behavioral event timeline) |
| Basic site traffic reporting | No (not built for simple pageview/referrer reporting) | Yes (visitor counts, top pages, referrers, countries, device types) |
| Cookieless / no consent banner required | No (standard event and cookie-based tracking) | Yes (no cookies, no personal data, no consent banner required) |
| Session replay | Yes (all tiers) | No |
| A/B testing / experimentation | Yes (Growth and Enterprise, via Amplitude Experiment) | No |
| AI-assisted analysis | Yes (AI Agents, Growth and Enterprise) | No named AI-assisted analysis feature |
| AI search visibility tracking | Yes (early-stage ChatGPT and Perplexity brand mention tracking) | No (acknowledged gap versus a competitor like Plausible) |
| Multi-site management | No (single-product focus, no site-pack structure) | Yes (50+ sites included on every plan) |
| Data retention | Not published as a forever guarantee | Forever, on every plan |
| API access | Yes (all tiers) | Yes (all plans) |
| Free tier | Yes (Starter, 50K monthly tracked users) | No (7-day free trial only) |
| Starting price | Free (Starter); $49/mo (Plus) | From $15/mo |
Amplitude has a thin AI visibility feature; Fathom has none at all
Amplitude tags brand mentions in ChatGPT and Perplexity as an early, bundled feature inside its product analytics dashboard. Fathom Analytics has no AI traffic detection feature whatsoever, a gap it acknowledges itself when comparing against a rival like Plausible. Neither gives a brand or agency prompt-level detail on where it is being cited or recommended across the AI engines people now use to research purchases. AI Peekaboo covers that gap directly, tracking ChatGPT, Gemini, Perplexity, Google AI Overviews, and Google AI Mode with white-label reporting and a read/write API from $50 per month, and runs alongside either Amplitude or Fathom rather than replacing them.
Read the AI Peekaboo review →Which should you choose?
AmplitudeFathom AnalyticsFathom AnalyticsAmplitudeFathom AnalyticsAmplitudeFathom AnalyticsThis comparison is really a depth-versus-simplicity question, not a feature-for-feature contest, because Fathom is not trying to build what Amplitude built. Fathom's entire pitch is that most sites do not need a behavioral analytics suite, they need trustworthy visitor counts without a cookie banner, and it delivers that cleanly. Amplitude's pitch is the opposite: if you need to know precisely why users drop off in a signup funnel, a simple pageview counter will never answer that, no matter how clean its dashboard is. Picking the wrong one for your actual question means either paying for complexity you will never use or missing behavioral detail you actually need.
Bottom line
If you are running a product with signed-in users and need to understand behavioral funnels, retention, and experiments, use Amplitude's free Starter tier up to 50,000 tracked users and only move to a paid plan once that limit or a specific Growth feature forces the decision. If you run a marketing site, blog, or agency portfolio and just need trustworthy traffic numbers without a cookie banner, Fathom's $15/month starting plan and forever data retention is the simpler, cheaper answer, and its 50-site allowance makes it a genuinely good fit for agencies. Do not buy Amplitude's complexity for a job Fathom already does well, or expect Fathom to ever answer a behavioral funnel question.
Frequently asked questions
Is Fathom Analytics a real alternative to Amplitude for product analytics?
No, Fathom has no behavioral event tracking, funnel analysis, or session replay, since it is deliberately scoped to simple site-traffic reporting rather than in-product behavior. A team that needs to know why users drop off at a specific funnel step needs Amplitude or a comparable behavioral analytics tool, not Fathom.
Does Amplitude require a cookie consent banner the way Fathom avoids one?
Amplitude uses standard event and cookie-based tracking and does not advertise a cookieless, consent-banner-free approach the way Fathom does. Fathom collects no cookies or personal data at all, which under GDPR, CCPA, and PECR means no consent banner is legally required. Teams prioritizing consent-banner-free compliance should weigh that difference carefully.
Why does Fathom have no free tier when Amplitude does?
Fathom's business model is a flat, predictable subscription starting at $15 per month with a 7-day trial to evaluate it, and no permanent free plan. Amplitude offers a genuinely usable free Starter tier up to 50,000 tracked users because its business model relies on upgrading teams once they outgrow that volume or need deeper features like experimentation.
Which tool is better for an agency managing many client websites?
Fathom Analytics is the clearer fit, since every plan includes 50 or more sites with additional packs available for $10 per month, letting one account cover a full client portfolio at predictable cost. Amplitude has no equivalent multi-site or agency-pricing structure; it is built around a single product's behavioral data rather than managing many separate properties.
Does either tool track AI-sourced traffic from tools like ChatGPT?
Amplitude has a thin, early-stage feature that tags brand mentions in ChatGPT and Perplexity as part of its product analytics dashboard. Fathom Analytics has no AI traffic detection feature at all, a gap it acknowledges itself compared to competitors like Plausible. Neither offers detailed AI visibility tracking on its own.
What happens to my historical data if I downgrade or pause a Fathom plan?
Nothing, your historical data remains accessible indefinitely on every Fathom plan, since forever data retention is a policy across the entire product rather than a tier-gated feature. This is a deliberate contrast to GA4, which imposed rolling data-expiry windows regardless of account status.