Both vendors have moved from per-seat pricing to a usage meter, which raises the real question: how many events do you get before the bill starts, and what else sits inside the same allowance?
TL;DR
Amplitude gives 2 million events a month away on Free with unlimited seats, 10,000 session replays and no time limit, then sells Plus from $0 with the first 2 million events free to a 70 million event ceiling; Growth and Enterprise are event-based quotes. PostHog runs a free allowance on every product, then a pay-as-you-go plan with the same allowance, per-unit charges above it and a billing limit per product: 1 million analytics events, 5,000 recordings and 1 million flag requests a month. Pick Amplitude for the higher ceiling; pick PostHog for one allowance spanning replays, errors and flags.
Amplitude's pricing page states a Free plan at $0 with 2 million events a month forever, no credit card and unlimited seats, carrying 10,000 monthly session replays, unlimited feature flags, one active experiment, limited guides and surveys, 2,000 AI feedback records, 5,000 monthly agent sessions and one year of data access. Plus starts at $0 with the first 2 million events free and scales up to 70 million events and 700,000 monthly tracked users, adding custom events and formulas, 20 behavioural cohorts, heatmaps, three spaces and two years of data, and it requires a card. Growth and Enterprise are custom, event-based and quoted, adding SSO with project permissions, 20,000 and 50,000 monthly replays, RBAC and data access controls. Startups under 20 employees with less than $10 million in funding get one free year of Growth.
PostHog prices per product with a free monthly allowance on each and no time limit: 1 million analytics events, 5,000 session recordings, 1 million feature flag requests, 100,000 exceptions, 1,500 survey responses, 100,000 AI observability events, 1 million data warehouse rows and 10 GB of logs ingested, plus PostHog AI worth $5 of credits, Replay Vision worth $25 and PostHog Desktop worth $20. The free plan includes one project and one year of retention; pay-as-you-go keeps the same allowance every month, raises projects to six and retention to seven years, and charges per unit above the allowance with billing limits set for each product. Prices are in US dollars before tax, and the page states 97% of companies pay nothing.
| Feature | Amplitude | PostHog |
|---|---|---|
| Starting price | Free $0 with 2M events a month, no credit card | Free $0 with 1M events a month, no credit card |
| Free tier | Free forever, no time limit, unlimited seats, 10K replays | Free allowance on every product, resets monthly, usage stops at the limits |
| Entry paid tier | Plus starts at $0, first 2M events a month free, scales to 70M | Pay-as-you-go keeps the same monthly allowance, then per-unit rates |
| Top tier | Growth and Enterprise custom, event-based pricing | Enterprise packages, annual plans and volume discounts, quoted |
| Billing model | Per event volume, unlimited seats on every plan, USD | Per-product usage in US dollars, billing limits set per product |
| Overages | Plus scales with event volume without overage penalties; upper tiers quoted | Charged per unit above each product's free allowance, capped by the billing limit |
| Session replay | 10K replays a month on Free and Plus, 20K on Growth, 50K on Enterprise | 5K recordings a month free, 90-day retention on pay-as-you-go |
| Experimentation | 1 active experiment on Free and Plus, 2 on Growth and Enterprise | Experiments billed with feature flags; 1M flag requests free monthly |
| Data retention | 1 year on Free, 2 years on Plus, unlimited from Growth | 1 year on free, 7 years on paid; logs 14 days by default |
| Who pays for volume | Plus buyers scale into Growth or Enterprise quotes | Buyers add a card and pay per unit above the free allowance |
Pick Amplitude if
Two million events every month cost nothing, the seats are unlimited, and replay, flags and web experimentation already sit inside that allowance; Plus then starts at $0 with the same 2 million free before scaling to 70 million events. PostHog's free tier carries half the events, so the same traffic reaches a paid charge sooner.
Pick PostHog if
A single free allowance covers analytics, replays, errors, surveys and flags, the pay-as-you-go plan keeps that allowance every month, and billing limits per product stop the surprise bill. Amplitude's strength, a 2 million event free tier, is also its boundary: adding replay and errors on top is priced separately.
We collected no independent reviews, ratings or user quotations for Amplitude or PostHog in this run; the free allowances, the start-at prices and the 97% figure are the vendors' own. Prices were read from amplitude.com/pricing and posthog.com/pricing, both quoted in US dollars.
Amplitude's Free plan includes 2 million events a month against PostHog's 1 million, but PostHog's allowance also covers replays, errors, surveys and flags in the same free account, so the two counts are not measuring identical scopes.
Plus starts at $0 with the first 2 million events a month free and a credit card required. Above that, pricing scales with event volume up to 70 million events; Growth and Enterprise are custom, event-based quotes.
Yes, as long as usage stays inside each product's monthly allowance, which resets every month. The page states 97% of companies use PostHog for free with no credit card required, and its prices are in US dollars before tax.
No. Amplitude lists unlimited team members on every plan including Free, and PostHog's free plan includes unlimited team members, with paid plans adding projects and retention rather than seats.
Amplitude moves the account onto Plus, where the first 2 million events stay free and volume scales to 70 million events without overage penalties. On PostHog's free plan extra events are dropped; on pay-as-you-go the overage is charged per unit, subject to the billing limit.
Amplitude gives one year of data access on Free, two years on Plus and unlimited from Growth, with one-month replay retention throughout. PostHog retains events for one year on free and seven years on paid plans, with recordings for one month free and 90 days on pay-as-you-go.
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