Best product analytics for startups: why PostHog is a top pick
by ash the coder · published 26 October 2026
Last verified: 26 October 2026
Short answer: PostHog is a top pick when you want an all-in-one product analytics suite with pay-as-you-go billing and an open-source self-hosted edition alongside hosted SaaS (PostHog).
For startups that need session replay, feature flags, experiments and a self-hosting option, PostHog's free tier includes 1,000,000 analytics events and 5,000 session recordings per month (PostHog pricing).
Key takeaways
- PostHog's free tier includes 1M events, 5K session recordings, 1M feature flag requests and 100K error exceptions per month (PostHog pricing).
- Amplitude's Free plan gives the largest free event allowance at 2M events per month and includes 10,000 replay sessions on Free (Amplitude pricing).
- Mixpanel's Free tier also includes 1M events and 10K session replays plus up to 1k monthly experiment users (MEU) and 10 active feature flags (Mixpanel pricing).
- Heap's Free plan is session-based and includes up to 10k monthly sessions; session replay is an add-on on higher tiers (Heap pricing).
At a glance
| Tool | Pricing | Limits (free) | Standout feature | Best for |
|---|---|---|---|---|
| PostHog, posthog.com | Free + pay-as-you-go (pricing) | 1M events, 5K replays, 100K exceptions/mo (pricing) | All-in-one Product Analytics | Startups wanting self-hosting and feature flags |
| Amplitude, amplitude.com | Free plan (2M events) up through custom enterprise (pricing) | 2M events, 10K replays/mo (pricing) | Full platform, unlimited seats, built-in AI (pricing) | Startups that prioritise highest free event volume |
| Mixpanel, mixpanel.com | Free forever, Growth starts at $0 (scale tiers) (pricing) | 1M events, 10K replays, 1k MEU for experiments, 10 flags (pricing) | - | Startups wanting free experiments and flags |
| Heap, heap.io | Free "Find product-market fit" tier, Pro/Premier custom (pricing) | 10K sessions/mo (session-based metric) (pricing) | Automatic autocapture of every user event (pricing) | Startups that want autocapture and quick install |
PostHog
PostHog combines product analytics, session replay, error tracking, feature flags, experiments, heatmaps and a lightweight CDP/warehouse so teams can query product signals in one place (PostHog). The hosted pricing is pay-as-you-go and per-product, so you only pay for the features and usage you consume, and the free tier's monthly allowances reset every month (PostHog pricing).
Trade-offs: recording retention on the free plan is shorter than event retention - recordings keep for 1 month while events/metadata are kept 1 year on the free tier; paid plans extend event retention up to 7 years and recordings up to 90 days on pay-as-you-go plans, with add-ons for longer replay retention (PostHog pricing).
Who should pick PostHog: startups that want an all-in-one stack they can also self-host, with feature flags and experiments available from the same product.
Amplitude
Amplitude's Free plan includes 2M events per month and requires no credit card to start; every Amplitude plan includes the full platform (Analytics, Session Replay, Experimentation, Guides & Surveys) and unlimited seats (Amplitude pricing). Free replay retention is 1 month and Free data access is 1 year (Amplitude pricing).
Who should pick Amplitude: startups that want the largest free event allowance and a fully managed platform with unlimited seats and built-in AI features.
Mixpanel
Mixpanel's Free plan includes up to 1M events per month, 10K session replays per month, up to 1k MEU for experiments, up to 10 active feature flags and unlimited seats (Mixpanel pricing).
Who should pick Mixpanel: startups that want experiments and feature flags available on a free plan and a product-intelligence focus with MEU quotas explicitly shown (Mixpanel pricing).
Heap
Heap's Free plan is session-based and includes up to 10k monthly sessions, six months' data history, SSO and core analytics charts; session replay is offered as an add-on on Pro and Premier tiers (Heap pricing). Heap advertises "A single snippet automatically captures the entire digital experience of every user on every platform - no engineering needed," and reports it "Saved developers nearly 3,000 hours of manual tagging annually."
Who should pick Heap: startups that want automatic autocapture and can work with session-based billing or plan to buy replay as an add-on when they scale.
Which product gives the biggest free event allowance?
Amplitude gives the largest free event allowance: 2 million events per month on its Free plan (Amplitude pricing). PostHog and Mixpanel each include 1 million events per month on their free tiers (PostHog pricing, Mixpanel pricing). Heap uses sessions as its metric and includes 10k monthly sessions on Free (Heap pricing).
Example: at 50,000 events per month, PostHog, Mixpanel and Amplitude all remain within their free event allowances (PostHog and Mixpanel free = 1M, Amplitude free = 2M), so you can evaluate any of those three without moving off free immediately (PostHog pricing, Mixpanel pricing, Amplitude pricing).
How to choose
- If you must self-host or want an open-source licence you can run on‑prem, PostHog is the option with an MIT edition and explicit self-hosting guidance (PostHog pricing).
- If your immediate need is raw event volume on a free plan, Amplitude gives 2M free events, more than the others (Amplitude pricing).
- If you want experiments and feature flags available on a free tier with explicit MEU quotas, Mixpanel exposes those free allowances (Mixpanel pricing).
- If you prefer click-and-forget instrumentation and want autocapture, Heap focuses on automatic capture and gives 10k free sessions to start (Heap pricing).
When PostHog isn't the right fit
- Pick something else if you need the biggest free event allowance right away - Amplitude's Free plan includes 2M events (Amplitude pricing).
- Pick something else if you want session replays kept longer than the 1 month PostHog keeps on the free plan (PostHog pricing).
- Pick Heap if you prefer automatic autocapture and are comfortable buying replays as an add-on at scale (Heap pricing).
Verdict
Pick PostHog if you want an integrated product analytics stack with feature flags and experiments you can self-host and test under a substantial free monthly allowance. Pick Amplitude if your primary requirement is the largest free event quota (2M events) and a hosted platform with unlimited seats. Pick Mixpanel if you want free experiments (1k MEU) and free feature flags alongside analytics and replays.
Frequently asked questions
Should startups self-host their analytics?
Most early teams start on the hosted free tier and only self-host when they need data on their own servers. PostHog's self-hosting docs describe an MIT-licensed version run with Docker Compose, and say new Kubernetes deployments are no longer supported (PostHog self-host docs).
Which tools suit startups without dedicated analysts?
Amplitude, Mixpanel and PostHog all provide full platforms that include analytics, replay and experimentation; Amplitude and Mixpanel advertise unlimited seats on their plans, which helps distributed product teams get access without seat costs (Amplitude pricing, Mixpanel pricing, PostHog).
How long do free session replays retain?
PostHog keeps recordings for 1 month on the free plan (PostHog pricing). Amplitude's free replay retention is 1 month (Amplitude pricing).
Try PostHog
- Sign up and test the free tier with up to 1M events and 5K replays to validate your key flows (PostHog pricing).
- If you need self-hosting, try the MIT open-source edition on a staging instance to check deployment and SSO.
- Estimate your monthly events and replay needs and compare them to Amplitude's 2M free events and PostHog/Mixpanel's 1M free events before committing (Amplitude pricing, PostHog pricing, Mixpanel pricing).