Tabnine alternatives when your constraint is data residency

The real requirement behind the question

Tabnine's pitch is private deployment: the model runs where you run it, so source never crosses a network boundary you do not control. Teams that leave usually discover the replacement must preserve that property, which rules out every hosted IDE agent.

If that property is not actually required, the honest advice is that you can buy much better completion for less money. Tabnine's premium is the deployment model, not the model quality.

The shortlist that survives the filter

Tabby is the direct open-source equivalent: a self-hosted completion server with IDE plugins, no autonomous agent, no egress. It is the only option here that keeps both the privacy property and the cost low.

Continue and Cline can be pointed at a local model, which achieves a similar boundary by a different route — the client is open source and the model runs locally. The trade-off is that you now operate the whole stack.

What you give up

Self-hosted completion is behind hosted completion on quality, and the gap is largest exactly where agents shine: multi-file edits and long context. Any migration justified by compliance should budget for a capability regression, not just a cost change.