Reliable insights to build faster
Amplitude vs. PostHog
From first prototype to 10 million users, you need analytics you can trust. See why successful startups continue to choose Amplitude.
Amplitude delivers reliability you can build on
Amplitude is built to stay up when it matters most. As a public company with audited financials, enterprise-grade data integrity, and a track record of stability at scale, Amplitude treats reliability as the baseline your analytics, flags, and experiments depend on, not a roadmap promise. PostHog's own published post-mortems tell a different story, documenting a series of reliability incidents across a six-month window. When you're shipping fast, those systems are load-bearing, and a flag outage during a launch window costs more than sprint time. It costs the data you were betting on.
| Feature | Amplitude | PostHog |
|---|---|---|
| Public company with audited financials and SOX compliance | ✅ | ❌ |
| Enterprise-grade data integrity with no data loss events | ✅ | ❌ |
| Robust SDK with no documented failures, especially none that broke customer sites in production | ✅ | ❌ |
| Top-of-the-line security with no documented supply chain attacks | ✅ | ❌ |
| Super stable feature flags with no documented mass failures for 78% of US requests | ✅ | ❌ |
| Nine documented reliability incidents since mid-2025 | ❌ | ✅ |
Amplitude's AI is unlimited
Amplitude's AI is unlimited and autonomous: no credit allotments, no monthly ceiling, and no rationing when you need it most. Where PostHog's assistant stops once credits run out, Amplitude includes AI across every plan with no caps, so analysis never pauses mid-investigation. And it acts, rather than just answering: the Dashboard Monitoring Agent watches metrics around the clock, the Session Replay Agent reviews hundreds of sessions at once, the Web Experimentation Agent runs a test end to end, and MCP connectors plug Amplitude into the AI tools your team already uses.
| Feature | Amplitude | PostHog |
|---|---|---|
| Unlimited AI usage, no "2,000 credits per month," no $150/month ceiling | ✅ | ❌ |
| AI that monitors metrics and delivers findings 24/7 without manually querying every time | ✅ | ❌ |
| AI agents that act across the full platform, not just answer questions | ✅ | ❌ |
| MCP connectors that bridge your AI tools and analytics instead of just setting up tracking | ✅ | ❌ |
| Trains their AI models on your data | ❌ | ✅ |
| Says they're pivoting to headless, leaving all non-Claude Code experts in your org behind | ❌ | ✅ |
Amplitude's full platform is free from day one
Amplitude's free Starter plan gives you the full platform from day one, not a stripped-down preview. Analytics, Session Replay, Feature Experimentation, Guides and Surveys, and unlimited AI agents are all included at 10K MTUs and up to 2M events per month with no feature restrictions and no credit card, so every product surface is available before you have a dollar of revenue. It won't push you toward a sales call the moment you do anything useful, and it scales with you as your numbers grow.
| Feature | Amplitude | PostHog |
|---|---|---|
| Free session replays of user behavior, accessible from any chart | ✅ | ❌ |
| Free marketing analytics with campaign reporting and attribution support | ✅ | ❌ |
| Guides and surveys that live in your app, with behavior-based targeting | ✅ | ❌ |
| Free AI Data Assistant and built-in data management tools to help keep your taxonomy clean | ✅ | ❌ |
| Free access to the Forrester-rated #1 experimentation platform with unlimited feature flags | ✅ | ❌ |
PostHog's reliability issues
PostHog's own post-mortems document nine incidents in a six-month window, including four feature flag outages, three SDK failures that broke customer production sites, one permanent data loss event, and one supply chain attack.
Permanent data loss
ClickHouse bug deleted all S3 logs data over 8 hours with zero alarms. Used experimental feature not recommended for production. Unrecoverable.
Full platform free from day one
Amplitude's free Starter plan includes full platform access: analytics, Session Replay, Feature Experimentation, Guides and Surveys, and unlimited AI agents, at 10K MTUs and up to 2M events per month with no feature restrictions. Not a preview. The full thing.
Reliability that holds
Nine incidents in six months. Flag outages, permanent data loss, a supply chain attack. You get what you pay for.
AI that doesn't cap out
Autonomous agents, unlimited usage, no credits. PostHog's AI stops when the bill hits $150.
Experimentation you can bet on
CUPED, sequential testing, MutEx groups, holdouts. Forrester's #1 in 2026. PostHog launched basic A/B in November 2025.
One tool, not two
PostHog has no multi-touch attribution. Most teams end up running Google Analytics alongside it. Amplitude has it built in.
Why builders choose Amplitude
Verified G2 reviewer
"Amplitude is definitely the market leader when it comes to product analytics. They have the strongest feature set compared to PostHog, Mixpanel, and other players. They have a generous scholarship plan for startups and an affordable Plus plan. Lots of integrations and a user-friendly interface."
NTT DOCOMO
"With Amplitude AI Agents, our teams can streamline analysis directly from existing dashboards, helping us move faster while improving conversion rates and reducing cost per acquisition." Takashi Suzuki, SVP & GM of Data Platform Department
AirDNA
"Amplitude AI Agents cut 20 hours a week of manual reporting, but the bigger win is speed. Leadership gets smarter insights sooner." Allyson Marks, Product Analyst
Amplitude scholarship programs
Being budget-conscious doesn't mean you have to settle for a budget pick. Spend $0, get 1.2 billion events and the entire Amplitude platform so you can find product-market fit faster and cheaper.
Get one year of free access to the Amplitude Growth plan—including Analytics, Feature and Web Experimentation, Session Replay, and Activation—plus competitive discounts for life.
Criteria:
- Less than $10M in funding raised
- Fewer than 20 employees
Start building on a platform that grows with you.
Full platform access. Unlimited AI agents. No credit caps. Free to start, no sales call required.
Frequently asked questions
PostHog is an open-source, multi-product toolkit designed for developer-led teams that want self-hosted control and a low entry cost. Amplitude is a unified AI Analytics Platform with deeper behavioral analytics, autonomous AI agents, proven experimentation controls, and marketing attribution that PostHog doesn't offer natively. Teams may start with PostHog but subsequently move to Amplitude when reliability, scale, security, analytics depth or actionability become top of mind.
PostHog's free tier includes 1 million events per month, which is more generous than most free analytics tiers. Costs escalate quickly at scale: at 25 million events per month, PostHog Cloud pay-as-you-go pricing reaches approximately $2,343/month when you add analytics, feature flags, session replay, and AI credits together. Amplitude's Plus plan handles the same volume for approximately $534/month, and Amplitude for Startups is free for qualifying early-stage companies.
PostHog has a chat-based AI assistant (Max) but no autonomous agents. It is reactive: you ask questions and it answers. PostHog's AI usage is capped at 2,000 credits per month for free accounts (approximately a $20 value) with a $150 default billing cap for paid accounts. Amplitude's AI agents are autonomous: the Dashboard Monitoring Agent proactively watches metrics, the Session Replay Agent analyzes hundreds of sessions at once, and the Web Experimentation Agent can design, launch, and analyze tests without manual setup. All of these are included in Amplitude plans with no usage caps.
PostHog's own public post-mortems (posthog.com/handbook/company/post-mortems) document nine incidents in a six-month window, including four feature flag outages, three SDK failures that broke customer production sites, one permanent data loss event, and one supply chain attack. Feature flags and experiments are time-sensitive: an outage during a launch window or fundraising period is a real business risk, particularly for small teams that can't absorb the cost of a missed sprint.
Yes. Amplitude includes Feature Experimentation (server-side and client-side feature flags with statistical experiment controls), Web Experimentation (visual editor for no-code A/B tests), and Session Replay natively. Amplitude's experimentation tooling is rated #1 by Forrester (2026) and supports more advanced controls than PostHog's flags, including CUPED variance reduction, mutually exclusive experiment groups, holdouts, and approval workflows.
PostHog's free tier is more generous for pure event volume (1M events vs. Amplitude's 10K MTUs on the free Starter plan). For seed-stage teams with tight budgets and no dedicated analyst, that matters. Amplitude for Startups offers qualifying early-stage companies one free year of the Growth plan (up to 200K MTUs and 100M events per month), which removes the cost advantage. For teams that plan to grow, Amplitude's analytics depth, reliability, and AI capabilities become significant advantages before the Series A.