Drop one small script. See which headline, hero, or CTA is converting - across every page in your portfolio. No JS framework. No session-replay bloat. No enterprise sales call.
Built by a solo founder running 6 landing pages who got tired of guessing.
Mockup - this is what we're building. The dashboard is not live yet.
The current A/B testing market is split between enterprise tools you can't afford and OSS tools designed for product teams, not solo founders running multiple landing pages.
| Tool | What's frustrating |
|---|---|
| PostHog | Powerful, but the cloud tier scales fast and self-hosting is a Kubernetes-grade lift. |
| Plausible / Fathom | Beautiful privacy-first analytics - but no A/B testing. |
| Vercel A/B | Only works on Vercel. No cross-page dashboard for your portfolio. |
| GrowthBook | Great OSS - but the UX assumes a product team with PMs and engineers, not a solo founder with 6 landing pages. |
| VWO / Optimizely | Enterprise pricing, sales-led onboarding. Not built for one-person operations. |
| Keak | AI-autopilot hosted SaaS, $0.005 per impression. Built for marketers who want the AI to write the variants. Cost scales with traffic, lives outside your repo. |
| DartLab | Lives in your repo. Flat cost forever. You write the variants. One dashboard across your whole portfolio of landing pages. |
Three steps. No SDK install, no schema design, no event-naming meetings.
One tag in your <head>. Works with any framework or plain HTML. ~6KB gzipped, async, doesn't block render.
Click on the button you care about (signup, purchase, sign-in) right in the dashboard. We'll track conversions to it. data-dart-goal if you prefer code.
Edit the headline / hero / CTA in the dashboard. Traffic splits 50/50. Bayesian credible intervals tell you when a variant has truly won - usually in days, not weeks.
Two ways to be early.
Get notified at launch
Limited to first 50 buyers
Future public pricing (subject to change): $19/mo for 50K events · $49/mo for 250K events. Founders pay nothing more, ever.
Why open about it? Because the indie hacker community has been burned enough by vaporware. The honest pre-sell is the validation. If you don't trust it'll get built, the waitlist exists for exactly that reason.
I run a portfolio of 6 small SaaS / digital-product "darts" - each one a self-contained landing page or app I'm trying to find product-market fit for.
Last quarter I had no idea which headline on bidcalc.dev was actually converting. I tried PostHog (too much setup), looked at Vercel A/B (only works inside Vercel), and almost installed GrowthBook before realizing it would take a week to learn for a portfolio of 6 pages I check casually.
So I started spec'ing what I actually wanted: one script, one dashboard across all my pages, just A/B. If 10 other people running landing pages pre-buy this for $99 lifetime, I'll build it. If they don't, my portfolio doesn't need it badly enough to justify the build either.
Either way, you'll know in two weeks.
Free. Zero commitment. Ping when there's news.