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Technology · head to head

PostHog vs Read the Docs

PostHog logo

PostHog

Technology

The single platform to analyze, test, observe, and deploy new features

From
Free
Rated
-
Full reviewWebsite
Read the Docs logo

Read the Docs

Documentation

Documentation hosting with versioning built for open source

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: PostHog the free tier covers 1M events, 5K web session recordings and 2.5K mobile recordings per month before usage-based billing starts; Read the Docs build configuration is finicky, and build failures on dependency changes are a common frustration
  • They diverge on capability: PostHog covers Product analytics, Read the Docs covers Build on commit.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which PostHog and Read the Docs actually diverge.

Attributes where PostHog and Read the Docs differ
AttributePostHogRead the Docs
Pricing modelusage-basedFree for open source; paid business plans for private documentation
PlatformsWeb, Ios, Android, ApiWeb, Cloud
CategoryTechnologyDocumentation
Founded2020Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in PostHog

  • Product analytics
  • Session recording
  • Feature flags
  • A/B testing
  • Heatmaps
  • SQL access
  • Data warehouse
  • Apps platform

Only in Read the Docs

  • Build on commit
  • Version by branch and tag
  • Pull request previews
  • Free for open source

What people use each for

The jobs each tool is most often brought in to do.

PostHog

  • Product analyticsnot Read the Docs
  • Feature experimentationnot Read the Docs
  • User behavior trackingnot Read the Docs
  • A/B testingnot Read the Docs
  • Debug production issuesnot Read the Docs

Read the Docs

  • Open-source projects needing free hosted versioned documentationnot PostHog
  • Teams wanting docs rebuilt automatically on every commitnot PostHog
  • Reviewing documentation changes in a pull request before mergenot PostHog

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

PostHog

  • The free tier covers 1M events, 5K web session recordings and 2.5K mobile recordings per month before usage-based billing starts
  • Accounts without a card on file are limited to 1 project; adding one raises it to 6
  • Data retention is 1 year until a card is added, which extends it to 7 years
  • Support is community-only until the account is on a paid plan
  • Error tracking is capped at 100K exceptions and surveys at 1500 responses per month on the free tier

Read the Docs

  • Build configuration is finicky, and build failures on dependency changes are a common frustration
  • Default themes are recognisable and dated, so sites look alike unless customised
  • Private documentation requires a paid business plan
  • Build times on large projects are slow enough to interrupt a review cycle

Pricing, plan by plan

PostHog

Free
  • FreeFree
    • 1M events/month
    • 5K sessions/month
    • Unlimited users
  • Paid$undefined/month
    • $0.00031/event
    • $0.005/session
    • Advanced permissions
  • Enterprise$undefined/month
    • SAML SSO
    • Advanced security
    • Dedicated support

Read the Docs

Free
  • FreeFree
    • Core functionality
    • Public projects

Which should you pick?

Choose PostHog if

  • You need product analytics.
  • You want to start without paying.
  • You work on Web, Ios, Android, Api.
  • You also want session recording.
PostHog review

Choose Read the Docs if

  • You need build on commit.
  • You want to start without paying.
  • You work on Web, Cloud.
  • You also want version by branch and tag.
Read the Docs review

Questions people ask

Is PostHog or Read the Docs better?
Neither clearly leads. PostHog starts at Free and Read the Docs at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PostHog or Read the Docs?
PostHog starts at Free and Read the Docs at Free.
Does PostHog or Read the Docs run on more platforms?
PostHog runs on Web, Ios, Android, Api. Read the Docs runs on Web, Cloud.
Can I use PostHog for free?
Both have a free tier, so you can try either at no cost before committing.
What is PostHog best used for?
PostHog is most often used for product analytics, feature experimentation, user behavior tracking, a/b testing. Of those, product analytics and feature experimentation are not what Read the Docs is typically brought in for.
What can PostHog do that Read the Docs cannot?
PostHog covers Product analytics, Session recording, Feature flags, A/B testing. Read the Docs covers Build on commit, Version by branch and tag, Pull request previews, Free for open source.

Answered from the vendors’ own pages

PostHog: What does PostHog's free tier include per month?

PostHog free tier includes: 1M analytics events, 5K session replays, 1M feature flag requests, 100K error tracking exceptions, 1,500 survey responses, 1M data warehouse rows, 10K data pipeline events, 100K AI observability events, 500 PostHog AI credits, 10K workflow messages, and 10GB log ingestion. Source: https://posthog.com/pricing

Source
Read the Docs: Is Read the Docs free?

Free for open-source public projects. Private documentation requires a paid business plan.

PostHog: How much data retention does PostHog provide on paid plans?

PostHog free tier provides 1-year data retention. Pay-as-you-go plans offer 7-year data retention across all projects, enabling longer historical analysis. Source: https://posthog.com/pricing

Source
Read the Docs: What does it build from?

Most commonly Sphinx or MkDocs sources kept in your repository.

PostHog: What percentage of PostHog users stay on the free tier?

PostHog states that 97% of companies use PostHog for free, indicating extensive free tier adoption. However, specific per-unit pricing rates for overages on paid plans are not published. Source: https://posthog.com/pricing

Source
Read the Docs: How does versioning work?

It maps branches and tags to documentation versions, so several releases are served side by side without manual work.

PostHog: When does PostHog provide priority support on paid plans?

PostHog provides email or Slack support for accounts exceeding $2,000/month on pay-as-you-go plans. Specific response times and support SLAs are not detailed on their pricing page. Source: https://posthog.com/pricing

Source
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