Vanna AI
Open-source AI framework for generating accurate SQL from natural language - train it on your schema and query any database in plain English.
Vanna AI is an open-source Python library that uses retrieval-augmented generation to convert natural language questions into accurate SQL queries. Unlike generic text-to-SQL tools, Vanna trains on your specific database schema, DDL statements, and sample query-answer pairs, which dramatically improves accuracy on complex schemas. It supports 15+ databases including PostgreSQL, MySQL, BigQuery, Snowflake, and Databricks, and works with any LLM backend including OpenAI, Anthropic, and local models via Ollama. A hosted Vanna Cloud offering provides a web UI for teams who prefer not to self-host.
Key Features
- RAG-based SQL generation trained on your specific schema, DDL, and sample queries
- Support for 15+ databases including PostgreSQL, MySQL, BigQuery, Snowflake, and Databricks
- Python library embeddable directly into applications or Jupyter notebooks
- Model-agnostic - works with OpenAI, Anthropic, Groq, Ollama, and other LLM providers
- Follow-up question support for iterative, conversational data exploration
- Vanna Cloud hosted UI for teams who prefer a no-infrastructure option
Use Cases
- Data analysts querying complex databases without memorizing SQL syntax
- Developers embedding natural language database interfaces into internal tools
- Business users self-serving data requests without relying on engineering
- Data teams building schema-aware SQL generation tools for company-specific databases
Pros
- Open-source and self-hostable - no vendor lock-in and full control over data
- Schema-specific RAG training reduces hallucination rate significantly vs generic tools
- Model-agnostic design allows switching LLM providers without code changes
Cons
- Initial setup requires training on your schema, which takes time for large databases
- Accuracy degrades with very large or poorly documented schemas without curation
- Python-only - no native SDK for other languages
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Julius AI
AI data analyst that reads your spreadsheets, databases, and files - answering questions, building charts, and running analyses in plain English.
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