Softwr

Technology · head to head

PostHog vs Redocly

PostHog logo

PostHog

Technology

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

From
Free
Rated
-
Full reviewWebsite
Redocly logo

Redocly

Documentation

API documentation and OpenAPI governance platform

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only PostHog has a free tier, so it costs nothing to try first.
  • 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; Redocly only as useful as your commitment to OpenAPI; teams without a maintained spec get little from it
  • They diverge on capability: PostHog covers Product analytics, Redocly covers OpenAPI reference docs.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which PostHog and Redocly actually diverge.

Attributes where PostHog and Redocly differ
AttributePostHogRedocly
Starting priceFreeOn request
Pricing modelusage-basedFree open-source CLI and Redoc renderer; paid plans for the portal, published on the vendor site
Free tierYesNo
PlatformsWeb, Ios, Android, ApiWeb, Cloud, Self-hosted
CategoryTechnologyDocumentation
Founded2020Unknown

Identical on both: 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 Redocly

  • OpenAPI reference docs
  • Spec linting
  • Developer portal
  • Versioning
  • Try it
  • Git workflow

What people use each for

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

PostHog

  • Product analyticsnot Redocly
  • Feature experimentationnot Redocly
  • User behavior trackingnot Redocly
  • A/B testingnot Redocly
  • Debug production issuesnot Redocly

Redocly

  • API teams whose reference docs are thin because the spec is thinnot PostHog
  • Organisations enforcing API style rules across many teamsnot PostHog
  • Developer portals combining guides with generated referencenot 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

Redocly

  • Only as useful as your commitment to OpenAPI; teams without a maintained spec get little from it
  • The portal and governance features are paid, while the open-source renderer covers only reference rendering
  • Linting rules are another thing to configure and argue about before value appears
  • Narrower than a general documentation platform, by design

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

Redocly

On request

No published plan breakdown. See the Redocly review.

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 Redocly if

  • You need openapi reference docs.
  • You work on Web, Cloud, Self-hosted.
  • You also want spec linting.
Redocly review

Questions people ask

Is PostHog or Redocly better?
Neither clearly leads. PostHog starts at Free and Redocly at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PostHog or Redocly?
PostHog has a free tier; the other does not. Paid plans start at Free for PostHog and On request for Redocly.
Does PostHog or Redocly run on more platforms?
PostHog runs on Web, Ios, Android, Api. Redocly runs on Web, Cloud, Self-hosted.
Can I use PostHog for free?
Yes. PostHog has a free tier, so you can try it without paying. Redocly starts at On request.
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 Redocly is typically brought in for.
What can PostHog do that Redocly cannot?
PostHog covers Product analytics, Session recording, Feature flags, A/B testing. Redocly covers OpenAPI reference docs, Spec linting, Developer portal, Versioning.

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
Redocly: Is Redocly free?

The Redoc renderer and CLI are open source and free. The developer portal and governance features are paid, with pricing published on the vendor site.

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
Redocly: What does the linter do?

It enforces rules on the OpenAPI spec itself in CI — missing descriptions, naming, examples — so a poor spec fails the build rather than becoming poor documentation.

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
Redocly: Do I need OpenAPI to use it?

Effectively yes. Without a maintained specification there is little for it to work with.

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
Share

Related pages

More on PostHog

More on Redocly

Keep looking

Other head to heads