OnRamp vs PostHog

The short answer: PostHog is a broad open-source product analytics suite with session replay, feature flags, A/B testing, and more. OnRamp is narrowly focused on mobile onboarding funnels. If you specifically want to fix where users abandon onboarding in a React Native or Expo app, OnRamp is the faster, simpler path.

See the full side-by-side OnRamp vs PostHog comparison table for a feature-by-feature breakdown.

Scope

PostHog covers a wide surface area: product analytics, session replay (screen recording), feature flags, A/B testing, surveys, and a data warehouse. It's an all-in-one platform, which is powerful but also means significant configuration before any single feature is production-ready.

OnRamp covers one use case: understanding and improving mobile onboarding. Funnel, retention cohorts split by onboarding completion, live sessions, and journey maps - nothing else. Everything is pre-configured for the onboarding scenario.

Mobile support

PostHog has a React Native SDK but its primary design is web-first. Mobile session replay is in beta. Funnel and retention features work on mobile but require the same configuration as on web.

OnRamp is mobile-first. The SDK is built for React Native, Expo, native iOS (Swift), and Flutter, with a native Android (Kotlin) SDK coming soon. The journey map and session timeline are designed around how mobile apps navigate, not how web pages do.

Session visibility

Both tools show user-level event timelines.

PostHog offers video session replay - actual screen recordings - which is powerful for web but battery and bandwidth-intensive for mobile.

OnRamp does not record video. It captures the event path as an interactive node graph: screens and milestones as nodes, transitions as edges. This is lighter on performance and fully privacy-safe, with no risk of capturing sensitive user input.

Retention

PostHog has a retention report, but it measures any event returning to any event. Building a retention split by onboarding completion requires setting up a cohort and custom query.

OnRamp shows funnel-split retention out of the box: users who completed onboarding vs users who dropped off, week by week, with no configuration.

Self-hosting

PostHog can be self-hosted, which is its primary appeal for teams with strict data residency requirements.

OnRamp is cloud-only, but stores all data on EU-based servers and is GDPR-compliant by design. If your requirement is EU data residency rather than self-hosting specifically, OnRamp satisfies it without the operational overhead of running PostHog yourself.

Pricing

PostHog is free up to 1M events/month on the cloud plan. Beyond that, pricing is per event.

OnRamp has a 14-day full-feature trial. Pricing is per monthly active user - predictable regardless of how many events each user generates.

When to choose PostHog

• You need feature flags, A/B testing, or surveys in the same platform
• You want session video replay for web
• Self-hosting is a hard requirement
• You need a single platform across web and mobile

When to choose OnRamp

• Your primary goal is fixing mobile onboarding drop-off
• You want funnel, retention, and sessions without configuring dashboards
• You want a lighter footprint on mobile (no video recording)
• You want to be live in under 10 minutes