DataFast: analytics for founders who care about revenue, not pageviews
Most web analytics tools answer "how many people visited". DataFast answers "which tweet, blog post, or Reddit thread put money in my Stripe account". That reframing is the whole product, and it lands.
Built by Marc Lou (of ShipFast fame, who says he has launched 24 startups and builds in public to 127k+ Twitter followers), DataFast connects to Stripe or Lemon Squeezy and attributes each paying customer back to the traffic source that brought them. Not last-click vanity: full journeys, from first click to conversion, with goals, funnels, and a live visitor view that scores who's likely to buy.
The feature set is sharper than the pitch
A few things worth calling out specifically:
- Revenue per channel, per page, per country. Attribution isn't just bolted on at the campaign level; you can see which individual pages or referrers produce customers and what those cohorts are worth.
- Live visitor intelligence. A real-time map and feed of active visitors with purchase-likelihood scoring, exposed over an API. It is admittedly addictive; multiple users describe just watching the globe during a launch.
- MCP server and CLI. You can hook Claude Code, Cursor, or Codex into your analytics and ask "who visited the blog today and became a customer?" in plain English. Among indie analytics tools, this is genuinely unusual and, if you already work with AI agents, a real reason to pick DataFast over Plausible.
- Mention tracking. X and Reddit mentions of your brand get overlaid on the traffic chart, so you can see which social spike actually converted.
- Mobile apps with push notifications for sales and traffic spikes, a small thing that fits the founder-lifestyle audience perfectly.
Setup is famously fast. "Under 10 minutes" is the claim and the testimonials back it up: a 4KB script, or one of the plugins for WordPress, Shopify, Next.js, Webflow and around 20 other platforms.
The pricing page has problems
Here's where it gets awkward. When I loaded datafa.st, the pricing slider never rendered a number, and the plan cards displayed a literal "Save $NaN" string. For a company whose pitch is data accuracy, a broken price on your own pricing section is a bad look. Cross-checking third-party sources: plans reportedly start around $9/month (Starter, 10k events, 1 website, 1 team member) with a Growth tier around $19/month covering multiple sites. There's a 14-day free trial with no card, but no free tier at all, which stings next to Umami (self-hostable, free) or Plausible's low entry price.
The privacy story also needs reading carefully. The default script uses cookies, so you still need a consent banner in the EU. DataFast does offer a cookieless script, but its own changelog is blunt about the tradeoff: visitor IDs rotate more often, so multi-day journeys and long-window revenue attribution are less accurate. Given that long-window attribution is the product's core selling point, the cookieless mode undercuts the reason you'd buy it. Pick one: accurate attribution or banner-free GDPR compliance. You can't have both here.
What actual users say
The praise is loud but comes from a specific bubble. Nearly all visible social proof is indie-founder Twitter, Marc Lou's home turf. People report cancelling Plausible for it, calling it "better than Google Analytics" for simplicity, and crediting the Revenue per Visitor metric with real conversion gains. One maker said he spent three hours adding goals to every function because the data was that motivating. Product Hunt gave it a #1 day rank with 888 upvotes, but only a single written review, and independent review sites are essentially empty. That's not a scandal; it's just a young product whose audience is one specific kind of founder. If you're outside that world (an agency, an e-commerce team, an enterprise), the lack of third-party validation should give you pause. Also note what's missing: no heatmaps, no session recordings, no A/B testing. This is attribution and traffic analytics, full stop.
Should you buy it?
If you're a solo founder or small SaaS team running Stripe or Lemon Squeezy, and you've ever wondered which marketing effort actually paid: yes, try it. The trial is free and the 10-minute setup claim holds up in user reports. The MCP integration alone makes it the most future-proof pick in its price bracket for AI-assisted workflows.
Skip it if you need product analytics (PostHog territory), session replays, a free tier, or banner-free tracking with reliable long-window attribution. And keep an eye on that pricing slider: hopefully by the time you read this, they've fixed the NaN.