Alternatives to NLSQL

Wren AI is a data-analysis agent that turns natural language into governed SQL across 20+ data sources including BigQuery, PostgreSQL, ClickHouse and Amazon Redshift, running tools and scripts inside an isolated environment and describing its design as sandboxed, multi-step reasoning rather than chat. Agents query, chart, extract from PDFs, build dashboards and save skills. Its governance layer is the strongest thing it publishes: row- and column-level scoping, with access enforced at query time across every caller, human or agent, and role-based access with full activity logs that the vendor says make it provable who saw what and which query produced which number — though no tamper-evidence mechanism and no retention period are described. It is deployable as multi-tenant cloud, private cloud or air-gapped on-premise, exposes REST endpoints for embedding, and supports MCP. The engine is described as open source with no licence named on the page checked. A customer testimonial claims up to an 80% query hit rate. Adoption figures on the page are not internally consistent: it claims 15,000+ data experts and analytics teams in one place and 50,000+ users in another, and the two are not reconciled. No certification, regulatory posture, AI liability cover, indemnity or outcome-linked payment term is published on the page checked.