Firebase vs PostHog
Firebase and PostHog are both developer tools tools. Firebase is aimed at developers, while PostHog is aimed at developers and small businesses. Both have a free plan.
| Pricing | Freemium | Freemium |
| Starting price | Not published | Not published |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Built for | Developers | Developers, Small businesses |
| Platforms | web, ios, android | web |
| Country | US · 2011 | US · 2020 |
| Rating | — | — |
Choose Firebase if
Mobile and Flutter developers and teams in the Google ecosystem.
- Best-in-class mobile tooling and real-time sync
- Free tier suits prototypes and small apps
- Deep Google Cloud integration
Look elsewhere if: Relational data needs or teams wary of lock-in (Supabase, Neon).
Choose PostHog if
Engineering-led startups and scale-ups that want analytics, replay, flags and experiments without three vendors.
- Several products in one with shared data
- Generous free allowances; usage-based beyond
- Open source and engineer-friendly
Look elsewhere if: Marketing-only web analytics (Plausible) or large enterprises standardized on Amplitude.
Firebase vs PostHog pricing
Firebase
- Spark$0No-cost usage limits, no payment method needed
- BlazePay as you goUsage-based beyond free quotas; $300 free credit if eligible
PostHog
- Free$01M events, 5K recordings, 1M flag requests, 1,500 survey responses/mo
- Pay-as-you-gofrom $0.00005/per eventPer product after free tier, as low as $0.000009/event; billing limits
- Boost$250/moPlatform package: unlimited projects, SSO enforcement, HIPAA BAA
- Scale$750/moPriority support, SAML; includes Boost
- EnterpriseCustomRBAC, dedicated support, training
Firebase · Key features
- Firestore and Realtime Database with offline sync
- Authentication with many providers and phone auth
- Cloud Functions, Hosting and Cloud Storage
- Cloud Messaging push, Remote Config and A/B testing
- Crashlytics, Performance Monitoring and Analytics
- Extensions marketplace and Genkit AI framework
Cons
- NoSQL data modeling pitfalls
- Costs can spike with read/write volume
- Heavy vendor lock-in
PostHog · Key features
- Product analytics: funnels, retention, paths, trends, lifecycle
- Session replay with console and network logs
- Feature flags and multivariate experiments
- Surveys and in-app feedback
- Data warehouse, HogQL SQL and CDP destinations
- Error tracking and LLM observability
Cons
- UI can feel dense; analytics UX trails Amplitude
- Costs need monitoring across many products
- Self-hosting only recommended for small scale
Firebase vs PostHog: FAQ
Do Firebase and PostHog have a free plan?
Yes, both Firebase and PostHog have a free plan; paid plans add more usage and features.
Which is better for small businesses, Firebase or PostHog?
PostHog lists small businesses as a core audience, while Firebase is aimed more at developers.