TesiT

Open source A/B testing platform. Self hostable. Free.

Assign users to variants, log conversion events and compare results through a dashboard or directly via the API. No SDK required, no pricing page, no lock-in.

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How it works

1. Create an experiment with a name and a list of variants
2. Call the assign endpoint with any user ID to get a variant back
3. Log a conversion event when something meaningful happens
4. Check the results endpoint or open the dashboard to see which variant is winning

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API

Create an experiment POST /experiments

Assign a user to a variant GET /experiments/:id/assign?user_id=xyz

Log a conversion POST /experiments/:id/event

Get results GET /experiments/:id/results

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Stack

• Backend: Flask, MongoDB Atlas
• Frontend: HTML, CSS, JavaScript
• Fonts: IBM Plex Sans, IBM Plex Mono

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Running locally

Backend

cd backend
pip install -r requirements.txt

Create a .env file in the backend folder: MONGO_URI=mongodb_atlas_connection_string SECRET_KEY=enter-a-random-string

Then run:

python app.py

Frontend

Open frontend/index.html in your browser. No build step required.