Best AI Coding Tools for Legacy Code (2026)
Understanding and modernizing old codebases.
DevTools Review
DevTools Review tracks 11 AI coding tools and re-checks every price against the vendor’s own pricing page. Here’s what actually matters.
Best AI Coding Tools for Legacy Code (2026)
Understanding and modernizing old codebases.
We’ve tested all major AI coding tools across real production workflows. Here’s our breakdown.
Quick Picks
| You want… | Best tool | Starting price |
|---|---|---|
| Best overall | Claude Code | $20/mo (via Pro) |
| Best value | Cursor | $20/mo |
| Best free option | Cody | Free |
| Feature | C Claude Code | C Cursor | C Cody enterprise only | A Amazon Q Developer closed to new | J JetBrains AI |
|---|---|---|---|---|---|
| Price | $20/mo (via Pro) | $20/mo | Enterprise only | Closed to new signups | $10/mo |
| Autocomplete | Excellent | Good | Good | Good | |
| Chat | |||||
| Multi-file editing | |||||
| Codebase context | Full project | Full project | Full project | Workspace | Full project |
| Custom models | |||||
| VS Code compatible | |||||
| Terminal AI | |||||
| Free tier | |||||
| Try Claude Code | Try Cursor Free | See Sourcegraph pricing | Read the AWS announcement | Try JetBrains AI |
#1: Claude Code — Best Overall
Claude Code
Terminal-based AI coding agent from Anthropic with full codebase understanding.
Claude Code is our top pick. Terminal-based AI coding agent from Anthropic — the most capable agent for multi-step tasks.
Try Claude Code#2: Cursor — Best Value
Cursor
AI-first code editor built on VS Code with deep codebase understanding.
Cursor is the best value pick. AI-first code editor built on VS Code with deep codebase understanding and best-in-class autocomplete.
#3: Cody — Best Free Option
Cody
Sourcegraph's code-search assistant, now sold only as part of an enterprise plan.
Cody is the best free/open-source option. AI coding assistant by Sourcegraph with deep code search across large codebases.
Also Worth Considering
- Amazon Q Developer ($19/user/mo): AWS-integrated AI coding assistant with agentic capabilities and Java transformation.
- JetBrains AI ($10/mo): AI assistant built for JetBrains IDEs with the Junie coding agent.
The Bottom Line
Claude Code is our top recommendation for this use case, but Cursor is excellent value and Cody proves free tools are genuinely capable in 2026.
Still unsure? Use our 30-second picker.
Disclosure: We earn nothing from the links in this article. We are not enrolled in an affiliate programme for any tool here — most of them do not run one. Nobody pays to be ranked, and where we haven’t used a tool ourselves we say so.
FAQ
Try Claude CodeWritten by DevTools Review
We're developers who use AI coding tools every day. Our reviews are based on real-world experience, not press releases. We test with real projects and share what we actually find.