> ## Documentation Index > Fetch the complete documentation index at: https://docs.abtestly.com/llms.txt > Use this file to discover all available pages before exploring further. # Introduction > A/B testing for sites that need to stay fast. # ABTestly ABTestly is an A/B testing platform built for teams that care about site performance and cost predictability. It runs on Cloudflare's edge, ships a small inline snippet, and never auto-charges you for traffic overages. ## What's different about it * **Measured, not guessed** — in our 2026-06 benchmark (12 Lighthouse runs per arm, methodology published) the snippet added \~0ms of main-thread blocking and \~3ms to first paint. The runtime is \~10KB gzipped, does \~12ms of work once config arrives, and doesn't depend on third-party tag managers. The honest cost is the config fetch behind the anti-flicker hide — a \~90ms median content-hidden window on first views after we shipped edge caching for it (our first benchmark measured \~0.45s; we published both runs). The first visitor per Cloudflare location rebuilds the cache and can wait \~1–2s; repeat views are browser-cached. Config is served from Cloudflare's edge with no origin round-trip, and only running experiments are sent to the browser. We'd rather publish that number and keep shrinking it than quote an unmeasured one. * **Graceful overage handling** — if you exceed your monthly tracked users (MTU) limit, your already-bucketed visitors keep seeing their variant (statistical validity preserved), but new visitors stop being bucketed. You get a warning email and decide whether to upgrade. No surprise invoices. * **No data deletion** — downgrading, canceling, or being archived after 90 days of inactivity all preserve your data. Reactivation is one click. * **Permanent free tier** — 1 site, 1 active experiment, 3,000 MTU. Enough to evaluate the product on a real page. ([See current plans and limits.](https://abtestly.com/pricing)) ## Who this is for * **CRO professionals** running tests across multiple sites * **Solo founders** validating landing pages without a Convert/VWO contract * **Agencies** managing experiments for client portfolios If you're paying \$300+/mo for VWO Growth or Convert and feeling priced out, or hitting Optimizely's enterprise-only minimum, this is built for you. ## Where to start From signup to live experiment in 15 minutes. Where, how, and why to install the snippet correctly. Locations, audiences, conditions, bucketing. Pricing, MTU explanation, grandfathering on downgrade. ## How it works at a glance 1. You sign up at [app.abtestly.com](https://app.abtestly.com), add your site, and paste a snippet into the `` of your HTML. 2. You build an experiment in the dashboard: name, hypothesis, targeting, variants, goals. 3. You click Start. The new config propagates to all edge locations within \~60 seconds. 4. Your visitors hit your site, the snippet decides which variant to show, and they see their assigned version on the first paint (no flicker). 5. Real-time exposures and conversions stream into your results dashboard. Most tests need 5,000+ exposures per variant for 95% statistical confidence. ## Need help? Email **[support@abtestly.com](mailto:support@abtestly.com)** — we usually reply within a few hours during weekdays. For Enterprise pricing or custom contracts, contact **[enterprise@abtestly.com](mailto:enterprise@abtestly.com)**.