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Technology · head to head

PostHog vs Vitest

PostHog logo

PostHog

Technology

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

From
Free
Rated
-
Full reviewWebsite
Vitest logo

Vitest

Testing

Fast unit test framework powered by Vite

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; Vitest assumes Vite: projects on webpack or other bundlers lose the main advantage
  • They diverge on capability: PostHog covers Product analytics, Vitest covers Shares Vite config.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which PostHog and Vitest actually diverge.

Attributes where PostHog and Vitest differ
AttributePostHogVitest
Pricing modelusage-basedOpen source, no licence fee
PlatformsWeb, Ios, Android, ApiLinux, macOS, Windows
CategoryTechnologyTesting
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 Vitest

  • Shares Vite config
  • Jest-compatible API
  • Fast watch mode
  • ESM and TypeScript native

What people use each for

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

PostHog

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

Vitest

  • Unit testing an application already built with Vite, without a second build confignot PostHog
  • Migrating from Jest for faster watch-mode feedbacknot PostHog
  • Testing TypeScript and ESM code without transform configurationnot 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

Vitest

  • Assumes Vite: projects on webpack or other bundlers lose the main advantage
  • Younger than Jest, so some plugins and matchers in the Jest ecosystem have no equivalent
  • Jest compatibility is close but not exact, and unusual Jest configurations still need work to port

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

Vitest

Free
  • VitestFree
    • Full functionality
    • Unlimited tests
    • Community support

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 Vitest if

  • You need shares vite config.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want jest-compatible api.
Vitest review

Questions people ask

Is PostHog or Vitest better?
Neither clearly leads. PostHog starts at Free and Vitest at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PostHog or Vitest?
PostHog starts at Free and Vitest at Free.
Does PostHog or Vitest run on more platforms?
PostHog runs on Web, Ios, Android, Api. Vitest runs on Linux, macOS, Windows.
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 Vitest is typically brought in for.
What can PostHog do that Vitest cannot?
PostHog covers Product analytics, Session recording, Feature flags, A/B testing. Vitest covers Shares Vite config, Jest-compatible API, Fast watch mode, ESM and TypeScript native.

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
Vitest: Is Vitest free?

Yes, open source under the MIT licence.

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
Vitest: Is Vitest compatible with Jest?

The API is deliberately Jest-compatible and most migrations are mechanical, though unusual configurations and some ecosystem plugins need attention.

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
Vitest: Do I need Vite to use Vitest?

It works without a Vite app but the main benefit — sharing one config and transform pipeline — only applies if you are already using Vite.

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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