Is PostHog or Weka better?

Neither clearly leads. PostHog starts at Free and Weka at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, PostHog or Weka?

PostHog starts at Free and Weka at Free.

Does PostHog or Weka run on more platforms?

PostHog runs on Web, Ios, Android, Api. Weka runs on Linux, Mac, 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 Weka is typically brought in for.

What can PostHog do that Weka cannot?

PostHog covers Product analytics, Session recording, Feature flags, A/B testing. Weka covers Classification, Regression, Clustering, Association rules.

Technology · head to head

PostHog vs Weka

PostHog

Technology

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

From: Free
Rated: -

Full review Website

Weka

Machine Learning

Collection of machine learning algorithms

From: Free
Rated: -

Full review Website

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; Weka the package management system needs an internet connection to download and install packages, so an air-gapped install gets only the core distribution
They diverge on capability: PostHog covers Product analytics, Weka covers Classification.
Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which PostHog and Weka actually diverge.

Attributes where PostHog and Weka differ
Attribute	PostHog	Weka
Pricing model	usage-based	open-source
Platforms	Web, Ios, Android, Api	Linux, Mac, Windows
Category	Technology	Machine Learning
Founded	2020	1993

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 Weka

Classification
Regression
Clustering
Association rules
Feature selection
Java
R
Python

What people use each for

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

PostHog

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

Weka

Teaching and exploring classic machine learning algorithms through a GUInot PostHog
Running data mining experiments and preprocessing without writing codenot 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

Weka

The package management system needs an internet connection to download and install packages, so an air-gapped install gets only the core distribution
Weka is split into a stable 3.8 branch that receives only bug fixes and compatibility-safe upgrades and a 3.9 development branch that may receive features that break compatibility
Weka requires a 64-bit Java VM; the bundled installers ship Bellsoft OpenJDK 25 per platform and architecture

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

Weka

Free

Open SourceFree
- All ML algorithms
- GUI and CLI
- Java API

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 Weka if

You need classification.
You want to start without paying.
You work on Linux, Mac, Windows.
You also want regression.

Weka review

Questions people ask

Is PostHog or Weka better?: Neither clearly leads. PostHog starts at Free and Weka at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PostHog or Weka?: PostHog starts at Free and Weka at Free.
Does PostHog or Weka run on more platforms?: PostHog runs on Web, Ios, Android, Api. Weka runs on Linux, Mac, 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 Weka is typically brought in for.
What can PostHog do that Weka cannot?: PostHog covers Product analytics, Session recording, Feature flags, A/B testing. Weka covers Classification, Regression, Clustering, Association rules.

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

Weka: What is the cost of Weka software?

Weka is provided at no cost as open-source software released under the GNU General Public License, making it freely available for download and use.

Source

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

Weka: Are there commercial licensing options available?

Yes, the project offers information about commercial licenses for organizations requiring non-GPL terms, which can be found in their commercial applications documentation.

Source

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

Weka: What support resources are available to users?

Multiple support avenues exist including comprehensive documentation, frequently asked questions, dedicated help resources, and access to courses for learning the platform.

Source

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

Weka: Is source code access provided?

Yes, developers have full access to source code through the Git repository, along with development documentation and code credits for contributors.

Source

PostHog vs Weka

PostHog

Weka

The short version

Where they differ

What each one covers

Only in PostHog

Only in Weka

What people use each for

PostHog

Weka

Where each one falls short

PostHog

Weka

Pricing, plan by plan

PostHog

Weka

Which should you pick?

Choose PostHog if

Choose Weka if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on PostHog

More on Weka

Keep looking

Other head to heads