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Data Storage

Evidential is built with privacy by design — it stores only what’s essential to make experiments work, mostly aggregated, while raw data always stays in your own environment.

What we store:

✅ Aggregared Data

We mostly only anonymized and aggregated information in a PostgreSQL application database, such as:

  • Experiment specifications — name, hypothesis, start/end dates, configuration details
  • Experiment results — regular snapshots of aggregated experiment metrics

⚠️ Granular Data

There are two types of user-led actions that can expose granular data containing PII:

  • Participant IDs Used to track assignment and outcomes. 👉 Users must ensure IDs used in experiments containt no raw personal information, or hash them before use

  • Unique values of columns used as filters Stored to enable autocompled. Avoid using columns with PII (e.g., names, emails) as filters.

🚫 What We Don’t Store

Evidential doesn't stores or copies raw-level data. All analysis queries run directly in your database.

📄 Learn More

Read our full Privacy Policy (coming soon) for details on data handling and protection.