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Dataherald
Open-source natural-language-to-SQL engine and API
FreeSQL open-sourcetext-to-sqlapi
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Starting price
2022
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Dataherald
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Dataherald
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What is Dataherald?

Content last verified May 4, 2026 · by the AI Tools Set Research Team

Dataherald is an open-source natural-language-to-SQL engine and API you can embed in your product. It uses an agent-based approach for accuracy on enterprise data and can be self-hosted for full control over how it runs.

API-first by design, it is meant for developers adding a plain-English data interface to their applications rather than being an end-user app.

Key Features of Dataherald

  • Natural-language-to-SQL API: Add a plain English data interface to your app.
  • Agent-based accuracy: Uses agents to improve correctness on complex schemas.
  • Self-hostable: Run the engine in your own environment.

Use Cases for Dataherald

  • Add a data chatbot to your product
  • Accurate enterprise querying
  • Self-host for control
  • Automate data questions

Pros & Cons

Pros
✓
Open source
✓
API-first design
✓
Accuracy tooling
Cons
✗
Developer setup required
✗
Not an end-user application

Pricing

MOST POPULAR
Open Source
$0
✓NL-to-SQL API
✓Agent accuracy
✓Self-hostable
Cloud
Custom
✓Hosted API
✓Higher limits
✓Support
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