Sumly vs DataFast
Both trace revenue to the visit that brought it. Sumly also reads subscription metrics from your billing and counts visitors in native iOS and Android apps.
| Sumly | DataFast | |
|---|---|---|
| Revenue traced to traffic sources | Yes | Yes |
| Payment providers | Stripe, Paddle, Lemon Squeezy, Polar, Creem, RevenueCat | Stripe, Lemon Squeezy, Polar and Shopify natively; guides for Paddle and others |
| RevenueCat (App Store and Google Play) | Yes | Not listed |
| MRR, churn, LTV, refunds and fees from billing | Yes | Not shown on its pages |
| App SDKs | iOS (Swift), Android (Kotlin), React Native | React Native |
| Funnels | Yes, ending in a payment | Yes |
| MCP server for AI assistants | Yes | Yes |
| Price | Early access | From $9 a month, 14-day trial |
DataFast as described on its own pages, 2 November 2026: datafa.st, datafa.st/docs/revenue-attribution-guide, datafa.st/docs/react-native . Something out of date? Write to us and we fix it.
Where DataFast is the better choice
- A command-line tool built for coding agents and a ChatGPT app.
- Tracking of AI bot traffic.
- A public price and a self-serve sign-up today.
Where Sumly fits
- You take money through more than one provider, or RevenueCat next to the web.
- You want to see which visits paid, on your site and in your apps.
- You run several products and want them on one screen.
Other comparisons
Try it with your own projects
Sumly opens to a few founders at a time. Leave your address and what you would connect; we write when your place is ready.
Or look around first: open the live demo.