Tabnine

Tabnine provides AI code completion with a focus on privacy — your code never leaves your infrastructure on the enterprise plan. It supports team-trained models, meaning it learns from your codebase to suggest patterns specific to your architecture. Works across all major IDEs and languages. Free tier is basic, paid tiers unlock team features and better models.

Ideal for enterprise engineering teams with strict security requirements, companies in regulated industries (healthcare, finance), and teams with proprietary codebases they can't share externally. If compliance or IP protection prevents using Copilot, Tabnine is the strongest alternative. Team plans let you train models on internal repos.

Downsides: suggestions are less impressive than Copilot out of the box, team-trained models require setup and compute resources, and the free tier is limited. Solo developers are better off with Copilot or Cursor. But for enterprises prioritizing security, it's the pragmatic choice.