Attrifast vs PostHog
The PostHog alternative for one question
PostHog can't answer: what drives revenue?
PostHog is a powerful engineering tool — session replays, feature flags, A/B tests, product funnels. But founders install it expecting to answer a different question: which marketing channels bring paying customers? That question requires Attrifast, not PostHog.
Free for 7 days, then $9.99/mo. No engineering setup required.
Why founders confuse product analytics with marketing attribution
Both tools track users on your website — but they answer completely different questions. Using PostHog for revenue attribution is like using a scalpel to hammer a nail.
PostHog answers
Product analytics for engineers
- "Which features do power users click most?"
- "Where do users drop off in our onboarding?"
- "Did the new UI reduce time-to-activate?"
- "What did this specific user do in their session?"
Attrifast answers
Marketing attribution for founders
- "Which channel drove $8,400 in Stripe revenue?"
- "Is Twitter or Google more profitable per visitor?"
- "Which blog post generates the most sales?"
- "Should I double ad spend on Instagram?"
These are not the same tool. PostHog requires engineers to instrument events, plan funnels, and build dashboards before it answers anything. Attrifast answers the revenue question in 2 minutes.
SDK weight and Core Web Vitals impact
Every kilobyte of JavaScript your visitors download has a cost. PostHog's SDK ships 60–150 KB of JavaScript. Attrifast ships 4 KB. The difference shows up in your Google rankings and conversion rate.
JS bundle size comparison (minified + gzipped)
Attrifast4 KB
4 KB
PostHog (min)60 KB
60 KB — 15x larger
PostHog (with replays + flags)150 KB
150 KB — 37x larger
+50–120 ms
PostHog adds to page load on mobile (3G)
LCP impact
Render-blocking JS delays Largest Contentful Paint
~0 ms
Attrifast — async, non-blocking, 4 KB
Estimates based on average mobile 3G throughput (~1.5 Mbps). PostHog bundle sizes sourced from bundlephobia.com and PostHog docs. Core Web Vitals impact depends on CDN and network conditions.
Feature comparison
| Feature | Attrifast | PostHog |
|---|---|---|
| Primary use case | Marketing attribution | Product analytics |
| JS bundle size | 4 KB | 60–150 KB |
| Requires engineering | ||
| Session replay / flags | ||
| Stripe revenue attribution | ||
| Revenue per visitor (RPV) | ||
| Cookie-free tracking | ||
| Setup time | 2 minutes | 30+ minutes |
PostHog excels at product analytics for engineering teams. Attrifast excels at marketing revenue attribution for founders. Both tools can coexist.
Revenue answers, not engineering backlogs
No event planning required
PostHog is only useful after your engineers define events, add SDK calls, deploy to production, and build dashboards. Attrifast reads revenue data automatically — no engineering sprint needed.
4 KB script vs 150 KB SDK
PostHog's SDK can exceed 150 KB with session replay and feature flags enabled. Attrifast is a 4 KB async snippet that loads after your page — invisible to your Core Web Vitals score.
Marketing attribution in 2 minutes
Connect Stripe, paste one script tag, and your revenue is attributed to channels, pages, and campaigns automatically. No third-party cookies, no fingerprinting, no cross-site tracking.
Use both — they solve different problems
PostHog and Attrifast are not competing for the same job. Most growing SaaS products use both: PostHog to improve the product, Attrifast to grow the right acquisition channels.
You want session replays, feature flags, and A/B testingUse PostHog
You want to know which channel drove $12,000 in Stripe revenue last monthUse Attrifast
Your engineers need funnel analysis and cohort retentionUse PostHog
You need to decide where to invest your next $5,000 in marketing spendUse Attrifast
Your page load is already slow and you ship PostHog with replaysConsider Attrifast for marketing data — no load penalty
Frequently asked questions
Does PostHog track Stripe revenue by marketing channel?
No. PostHog is a product analytics tool for engineering teams. It has no native Stripe integration and cannot attribute payments to the traffic source that drove them.
How big is the PostHog JavaScript bundle?
PostHog's JS SDK is 60–150 KB depending on which features are enabled. Attrifast is 4 KB and loads asynchronously, adding ~0ms to page load and having no impact on Core Web Vitals.
Can I use PostHog and Attrifast together?
Yes. PostHog handles product analytics (session replays, feature flags, funnels) and Attrifast handles marketing revenue attribution. Most growing SaaS products use both simultaneously.
50% OFF · launch promotion
Answer the revenue question in 2 minutes, not 2 weeks
See which marketing channels drive Stripe revenue. No SDK, no event planning, no engineering backlog.
- One script tag and a Stripe key — live in minutes
- Cookieless, so no consent banner for analytics
- Every AI referral matched to the payment it produced
7-day free trial · $0 due today · then $9.99/mo · cancel anytime
