Mrkr vs PostHog.
PostHog is a platform: analytics, replay, flags, experiments, surveys, warehouse. Mrkr is one tool that answers where the traffic came from and what it did. Both are legitimate choices, for different teams.
What is the difference between Mrkr and PostHog?
PostHog is an open-source product-analytics platform bundling analytics, session replay, feature flags, experiments, surveys, and a data warehouse. Mrkr is a single privacy-first web analytics tool with session replay, funnels, cohorts, and revenue attribution built in. PostHog is broader and heavier. Mrkr is cookieless by default and narrower on purpose.
Nobody should choose between these on a feature count, because PostHog wins that count outright. The real question is whether a platform is something your team will operate. PostHog rewards an owner. Without one it becomes ten configured-but-unused products and a bill.
One screen instead of ten products.
Visitors, sources, pages, goals, and revenue on one range, with no project switcher and no module to enable first. That is a smaller surface than PostHog on purpose. If the surface is what you want, take PostHog.
Where Mrkr is better.
Cookieless by default
PostHog's identity model assumes cookies. Mrkr uses a rotating salted hash and writes nothing persistent.
Weight
Under 6 kB against a PostHog bundle carrying replay, flags, and surveys.
Traffic and revenue together
Referrers, campaigns, and AI assistants are classified for you, with revenue attached.
Nobody has to own it
A script tag and a dashboard. That is the entire operational commitment.
Side by side.
| Mrkr | PostHog | |
|---|---|---|
| Category | Privacy analytics with replay | Product analytics platform |
| Session replay | Yes, on every paid plan | Yes |
| Heatmaps | No | Yes |
| Funnels | Yes | Yes |
| Cohorts and retention | Yes | Yes |
| Revenue attribution | Yes | Yes |
| Cookieless | Yes by default, cookie mode optional per site | Optional, cookies by default |
| Self-hosting | No | Yes |
| Free plan | No, 14-day trial | Yes, a large monthly free allowance |
| Entry paid price | $5/mo, 100K pageviews, session replay included | Usage-based, Generous free tier, then per-event pricing |
| Feature flags | No | Yes |
| A/B experiments | No | Yes |
| On-site surveys | No | Yes |
| Data warehouse | No | Yes |
| Tracker size | Under 6 kB gzipped | Grows with the modules you enable |
| Setup surface | One script tag | A platform to configure |
PostHog details checked against the vendor's own pricing and feature pages on 2026-08-24. Where a vendor does not publish a fixed list price, this table says how they charge rather than guessing a number. Vendors change packaging often, so confirm before you buy.
The whole product, in one demo
Every Mrkr feature runs on the live demo dataset. It takes about a minute to see whether the narrower surface is the one you want.
Open the live demo
Where PostHog is genuinely better.
Feature flags and experiments
Ship behind a flag and measure it in the same tool. Mrkr has no equivalent at any price.
The free tier
A large monthly allowance across its products. For a pre-revenue project that is hard to argue with.
Open source and self-hostable
You can read it and run it. Mrkr is proprietary and hosted only.
Warehouse and SQL access
Query the raw data and join it to other sources. Mrkr has no query API and no self-serve export; we pull your data for you on request.
Questions, answered.
Keep reading
- The wider PostHog alternatives roundup
Seven tools, reviewed on their merits.
- Mrkr vs Mixpanel
The other event-analytics comparison.
- Mrkr vs Matomo
The other open-source privacy option.
- How Mrkr session replay works
What is masked and how long it is kept.
- Mrkr pricing
One metered quota, no per-product bill.
- Open the live demo
The full product on real data.
Your first visitor is already here.
Drop in the script and watch them land. It takes about a minute.