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Tools · Comparison

Aider vs Claude Code vs Codeium

All three are code assistant tools. Here is what separates them.

AiderClaude CodeCodeium
What it isAn open-source pair programmer in the terminal that edits your files and commits each change to git.Anthropic’s terminal-based coding agent: it reads the repository, edits files, runs tests and commits.Manage fleets of local and cloud agents from one surface. Plan, delegate, review, and ship without leaving your editor.
CategoryCode AssistantCode AssistantCode Assistant
PricingFree · Free · model API costs applyPaid · Included with Claude Pro $20/mo · Max from $100/moFree · Free
How it billsFreeBundledFree
Free tierYesNoYes
RatingNot yet ratedNot yet rated4.2 from 2,200 reviews
Features
  • Every edit becomes a git commit
  • Repository map for context selection
  • Works with most model APIs
  • Voice input
  • Runs and reads test output
  • Multi-file edits across a repository
  • Runs tests and iterates on failures
  • Git-aware, can commit and open pull requests
  • CLI, desktop, web and IDE extensions
  • Extensible with MCP servers and custom skills
  • Free code completion
  • 70+ language support
  • All major IDE support
  • AI chat
  • Code search
  • In-line suggestions
  • Custom commands
  • Repository context
What works
  • Undo is just git revert
  • No subscription beyond model costs
  • Editor-agnostic
  • Handles whole tasks rather than single lines
  • Strong at understanding an unfamiliar codebase
  • Works with any editor because it lives in the terminal
  • Completely free for individuals
  • Wide language support
  • Supports all IDEs
  • Fast completions
  • No code upload
What does not
  • Terminal-only, no GUI
  • You manage the API keys and costs
  • Steeper start than an editor plugin
  • Requires a paid Claude plan
  • Reviewing large diffs takes discipline
  • Token cost adds up on big repositories
  • Less capable than Copilot
  • Occasional irrelevant suggestions
  • Rebranding confusion
  • Limited enterprise features
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