PostHog
SpyFu
| Feature | PostHog | SpyFu |
|---|---|---|
| Pricing | Free / from $0/mo | From $39/mo |
| Free Plan | ✓ Yes | ✗ No |
| Rating | 4.5 / 5 | 4.2 / 5 |
| Best For | developers, startups, product-teams, privacy-conscious-companies | ppc-managers, seo-professionals, agencies, competitive-analysts |
| Founded | 2020 | 2006 |
| Product Analytics | ✓ | ✗ |
| Session Replay | ✓ | ✗ |
| Feature Flags | ✓ | ✗ |
| Experiments | ✓ | ✗ |
| Surveys | ✓ | ✗ |
| Data Warehouse | ✓ | ✗ |
| Self Hosting | ✓ | ✗ |
| Competitor Keywords | ✗ | ✓ |
| Ppc Research | ✗ | ✓ |
| Backlink Analysis | ✗ | ✓ |
| Rank Tracking | ✗ | ✓ |
| Keyword Research | ✗ | ✓ |
| Domain Comparison | ✗ | ✓ |
✓ PostHog Pros
- All-in-one analytics replacing multiple tools
- Generous free tier (1M events/month)
- Self-hostable for full data control
- Feature flags and experiments built-in
✗ PostHog Cons
- Can be complex to set up properly
- Self-hosting requires infrastructure maintenance
- Less polished UI than Amplitude
✓ SpyFu Pros
- Unlimited search results on all plans
- Excellent competitor analysis
- Historical data going back years
- Good PPC research tools
✗ SpyFu Cons
- Interface can be overwhelming
- Data accuracy varies for smaller sites
- Limited international data
The Verdict
PostHog is built for developers and startups, with a focus on product-analytics and session-replay. SpyFu targets ppc managers and seo professionals and leads with competitor-keywords and ppc-research.
On pricing, PostHog is the clear winner for budget-conscious users — starting at $0/mo compared to $39/mo for SpyFu. That $39/mo difference adds up quickly for growing teams.
PostHog has a free plan, which gives it a meaningful edge for individuals and small teams exploring their options. SpyFu requires a paid subscription from day one.
Feature-wise, PostHog offers broader built-in capabilities (7 features vs 6), while SpyFu takes a more focused approach — which can mean a simpler, faster onboarding experience.
Bottom line: PostHog has a slight overall edge — but if unlimited search results on all plans matters most to you, SpyFu may still be the right call.