Updated April 29, 2026
Aider is an open-source terminal-based AI pair programming tool that edits code directly in your local git repository. It creates proper git commits, supports all major LLMs, and can work across multiple files simultaneously. Aider is popular with developers who prefer terminal workflows over IDE extensions.
GitHub Copilot is the most widely deployed AI coding assistant, integrated into VS Code, JetBrains, Visual Studio, and more. Five tiers: Free, Pro ($10/mo), Pro+ ($39/mo), Business ($19/user/mo), Enterprise ($39/user/mo). Moving to usage-based AI Credits billing on June 1, 2026.
Core capabilities each platform advertises.
What each tool does well, and the limitations to keep in mind.
Pros
Cons
Pros
Cons
Microsoft's commitment to defend customers against certain intellectual property claims related to Copilot output is a major reason we standardized on Business.
Read full reviewChoose Aider if you wantChoose if you want
Choose GitHub Copilot if you wantChoose if you want
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.