UserProofAmplitude vs PostHog in 2026, for founders who build with a coding agent
For a small team this is close. Amplitude gives more free, with 2M events and 10,000 replays a month against 1M and 5,000. PostHog prints every price, charges no seats and adds error tracking. Pick Amplitude for product analysis and PostHog if engineers run it. Both connect to coding agents through MCP.
One table only this page shows: both vendors' bills side by side at real volumes, from PostHog's per-unit tiers and Amplitude's plan limits, read November 6, 2026. At 10,000 replays a month Amplitude is $0 and PostHog is $25. At 2M events Amplitude is $0 and PostHog is $50. Past those points PostHog keeps printing a price and Amplitude moves to an estimator or sales.
Jump to: verdict · the comparison · cost at real volumes · for your coding agent · pick one if · FAQ
Verdict
| You are | Pick | Deciding factor |
|---|---|---|
| An engineer-led startup that wants errors, replay and flags together | PostHog | Printed unit prices, no seat fees, error tracking included. |
| A product team that lives in funnels, cohorts and experiments | Amplitude | Deeper behavioral analysis and more free volume. |
| A founder under 2M events who wants the bill at $0 as long as possible | Amplitude | 2M events and 10,000 replays free, against 1M and 5,000. |
| A startup under $5M raised | PostHog first, then compare | $50,000 in credits for 12 months if under 2 years old. Amplitude offers a free year of Growth under $10M and 20 people. |
This is a near tie for a small team, and the free tiers will decide it before the features do. Neither tool hands your agent a fix: for that, see the note under coding agents.
The 15-row comparison
Every cell comes from the vendor's own pricing page or docs, read November 6, 2026.
| Amplitude | PostHog | |
|---|---|---|
| Free events | 2M a month | 1M a month |
| Free replays | 10,000 a month | 5,000 a month |
| Paid model | Plus starts at $0 and scales by events; Growth and Enterprise by quote | Pay as you go, $0 base, per-unit tiers on every product |
| Printed paid price | None; an estimator on the page | Yes, every tier |
| Seats | Unlimited on every plan | No per-seat charges |
| Replay retention | 1 month; an add-on for more on Growth and Enterprise | 30 days free, up to 90 on pay as you go |
| Data retention | 2 years on Plus; custom on Enterprise | 1 year free, 2 years paid |
| Replay cap | 10,000, 20,000 on Growth, 50,000 on Enterprise, add-ons past that | None stated; price falls with volume |
| Heatmaps | From Plus | Yes, with clickmaps and scrollmaps |
| Feature flags | Unlimited on every plan | 1M requests a month free |
| Experiments | 1 active on Free and Plus, results from Growth | Bundled with flags, same free tier |
| Error tracking | Not a separate product on the pages we read; replay error inspection and an agent skill to triage them | A product of its own, tied to replay |
| Surveys and guides | Guides and surveys on every plan | Surveys as a product |
| MCP server | Hosted, OAuth, reads and writes content | Hosted and free to connect, reads and writes across products; answered our test with OAuth metadata |
| Startup offer | One free year of Growth, under $10M and under 20 people | $50,000 credits for 12 months, under 2 years old and under $5M raised |
Cost at real volumes
PostHog figures are our arithmetic from its tiers. Amplitude figures are its plan limits. “Not printed” means the page gives an estimator or a sales form instead of a number.
| Monthly usage | Amplitude | PostHog |
|---|---|---|
| 1M events | $0 | $0 |
| 2M events | $0 | $50 |
| 5M events | Not printed (Plus) | $152.90 |
| 10M events | Not printed (Plus) | $324.40 |
| 5,000 replays | $0 | $0 |
| 10,000 replays | $0 | $25 |
| 20,000 replays | Growth, by quote | $67.50 |
| 50,000 replays | Enterprise, by quote | $172.50 |
Amplitude's page has printed no dollar price above $0 on any of our 14 daily reads from October 23 to November 5, 2026. PostHog's page showed the same 93 distinct dollar amounts on all 14 reads through November 5. Details on our PostHog pricing page.
For your coding agent
Both run hosted MCP servers that sign in with OAuth, and both answered our test request on November 6, 2026 in under a second. PostHog's npx @posthog/wizard mcp add installs it into Claude Code, Cursor and others. Amplitude's docs give a setup for each client and list agent skills such as replay-ux-audit, which watches several replays of a flow and writes a ranked friction map. Your agent can read a lot from either. The call on what to change stays with you.
A short aside if neither fits: if you build with a coding agent and want it handed one fix with the file and line, then a check on your goal, that is what UserProof does, free for 5,000 recorded visits a month and $29 for 50,000. It has no flags, cohorts or experiments, so it sits beside these two tools and doesn't replace them.
Pick one if
Pick Amplitude if you need the most free volume, run experiments with a product team, or want behavioral cohorts and predictions. Ranges for rivals: Amplitude alternatives.
Pick PostHog if your team is engineers, you want errors beside replays, or you want to know your bill before you sign anything. Ranges for rivals: PostHog alternatives, and LogRocket vs PostHog if debugging is the job.
Against our own product: UserProof vs Microsoft Clarity. To price replay across 11 tools, use the session replay cost calculator, and see UserProof pricing for ours.
FAQ
Is PostHog cheaper than Amplitude?
Under 2M events and 10,000 replays a month, Amplitude is cheaper: both are free there and PostHog is not. Past that, PostHog prints its price and Amplitude doesn't, so you need its estimator to compare.
Does PostHog replace Amplitude?
For many engineering teams, yes: it covers analytics, replay, flags, experiments and error tracking. A product team that depends on Amplitude's cohorts and predictions may miss them.
Which has more free session replays?
Amplitude: 10,000 a month against PostHog's 5,000. Amplitude keeps them 1 month and PostHog 30 days on its free plan.
Do Amplitude and PostHog work with Claude Code?
Yes, both. Each runs a hosted MCP server that signs in with OAuth, and both document a Claude Code setup.
Is either one open source?
PostHog describes itself as open source, and Amplitude does not on the pages we read.
Sources, read November 6, 2026
- Amplitude: pricing, Session Replay docs and MCP docs, read November 6, 2026
- PostHog: pricing and its markdown price list, MCP docs, startup program and heatmaps, read November 6, 2026
- Daily reads: our pricing ledger, October 23 to November 5, 2026