Flowsery vs PostHog
All-in-one product platform versus focused privacy-first analytics β a 2026 comparison.
Last updated: April 2026
TL;DR
PostHog is a broad product platform offering analytics, session replay, feature flags, experiments, surveys, error tracking, and more β with a very generous free tier of 1M events/month. Flowsery is a focused, privacy-first web analytics tool with a cookie-free sub-1 KB script, built-in funnel analysis, and GDPR compliance without consent banners. PostHog is the better choice if you want a single platform that covers product analytics, feature flags, and experimentation. Flowsery is the better choice if you want lightweight, privacy-compliant website analytics that are simple to set up and will never slow down your pages.
Feature Comparison
Feature | Flowsery | PostHog |
|---|---|---|
Privacy Compliance | GDPR, CCPA, PECR compliant β no cookies | GDPR compliant β uses cookies, consent may be required |
Free Tier | Yes β up to 5k events/month | Yes β 1M events/month, 5k session recordings |
Goal/Conversion Tracking | Built-in with conversion funnels | Yes β actions and insights |
Funnel Analysis | Yes β multi-step funnels included | Yes β included on free tier |
Custom Events | Yes β included in Pro plan | Yes β included on free tier |
API Access | Full REST API on Pro plan | Full API on all tiers |
Self-Hosting / Open Source | Cloud-hosted only | Yes β open source (MIT), self-hostable |
Script Size / Performance | < 1 KB, no cookies | ~70-100 KB+ with autocapture and session replay |
Real-Time Dashboard | Yes β live visitor view | Yes β live events feed |
Where Flowsery Wins
True Privacy Without Cookies
Flowsery never sets cookies and never requires a consent banner. PostHog uses cookies for user identification and session replay, which means you typically need a cookie consent banner to comply with GDPR and ePrivacy regulations.
Minimal Performance Impact
Flowsery's tracking script is under 1 KB. PostHog's SDK with autocapture and session replay can add 70-100 KB or more to your page. For sites where Core Web Vitals matter, the difference is significant.
Simplicity and Focus
Flowsery does one thing well: website analytics. PostHog bundles 10+ products into a single platform, which is powerful but can be overwhelming if you only need traffic analytics and conversion tracking.
Predictable, Flat Pricing
Flowsery uses flat monthly pricing with clear tiers. PostHog uses usage-based billing that scales with events, session recordings, and feature flag evaluations β costs can be harder to predict as usage grows.
Where PostHog Wins
Generous Free Tier and Breadth of Features
PostHog's free tier includes 1M events/month, 5,000 session recordings, 1M feature flag requests, and access to surveys and experiments. It is one of the most generous free plans in the analytics space.
All-in-One Product Platform
PostHog combines product analytics, session replay, feature flags, A/B testing, surveys, error tracking, a data warehouse, and LLM analytics in a single platform. If you need multiple product tools, PostHog can replace several standalone products.
Open Source and Self-Hostable
PostHog is open source under the MIT license and can be self-hosted. Over 90% of companies using PostHog stay on the free tier, and the self-hosted option gives complete control over your data.
- β
Need cookie-free analytics that comply with GDPR without consent banners
- β
Want a lightweight script that will not affect page load performance
- β
Prefer simple, focused website analytics over an all-in-one product suite
- β
Want predictable monthly pricing without usage-based billing surprises
- β
Want product analytics, session replay, and feature flags in one platform
- β
Need a generous free tier for a high-traffic product with many events
- β
Want open-source software you can self-host and extend
- β
Need A/B testing, surveys, or error tracking alongside your analytics
Frequently Asked Questions
Try Flowsery Free
Cookie-free, privacy-first analytics with a sub-1 KB script. Free for up to 5k events/month.