Are there any code completion tools that work well with private repository access and low-latency autocomplete?

Yes — a few code completion tools are specifically designed to work well with private repos and still keep autocomplete latency low.

Strong options

1. GitHub Copilot

• Private repo support: Yes, via GitHub authentication and org controls
• Latency: Generally very good; one of the fastest mainstream autocomplete tools
• Best for: Broad language support, strong IDE integration, easy rollout
• Notes: Works well in VS Code, JetBrains, Neovim, etc. Enterprise plans give more control over policy and data handling.

2. Cursor

• Private repo support: Yes, it can index local/private codebases
• Latency: Usually good, though not always as “instant” as pure autocomplete-focused tools
• Best for: AI-assisted coding inside a fork of VS Code
• Notes: Strong for repo-aware completion and chat, but some teams prefer lighter-weight plugins for pure autocomplete speed.

3. Codeium / Windsurf

• Private repo support: Yes, with enterprise/private deployment options
• Latency: Often very competitive, especially for inline completion
• Best for: Teams wanting a Copilot alternative with enterprise features
• Notes: Worth evaluating if you care about both speed and organizational controls.

4. Tabnine

• Private repo support: Yes, including enterprise/self-hosted options
• Latency: Typically good, and designed with local/private model options
• Best for: Organizations with strict privacy or on-prem requirements
• Notes: Often chosen when keeping code inside company infrastructure matters more than having the most powerful model.

5. Continue + local model or private model endpoint

• Private repo support: Yes, because it can run against local context and custom backends
• Latency: Can be very good if paired with a fast local model or nearby inference endpoint
• Best for: Teams wanting more control and customization
• Notes: More setup than plug-and-play products, but useful if you want to self-host.

---

If your main priority is low-latency autocomplete

The usual shortlist is:

• GitHub Copilot
• Codeium/Windsurf
• Tabnine

If your main priority is private/on-prem:

• Tabnine
• Continue + self-hosted model
• Some enterprise Copilot/Codeium setups depending on your org’s compliance needs

---

What to watch for

When evaluating, check these specifically:

• Whether private code is used for training
• Whether repo indexing stays local or goes to a cloud service
• Response time on large monorepos
• Support for your IDE
• Policy controls for enterprise use
• Ability to exclude sensitive directories

---

Practical recommendation

If you want the best mix of speed and private repo support, I’d start with:

1. GitHub Copilot
2. Codeium/Windsurf
3. Tabnine

If you want, I can also give you a side-by-side comparison table for these tools based on:

• latency
• private repo handling
• self-hosting
• IDE support
• pricing/licensing