Aider

by Open Source

Save Visit

Overview

Open-source terminal pair programming

Best for: Pair programming with AI; multi-file editing via chat; git-integrated coding; code review; refactoring

At a glance

Pricing

Freebring your own API key

Difficulty: Advanced
Time to productivity: 15 min
Privacy: High
Learning curve: Moderate

Ideal for

Senior developersopen-source contributorsterminal-native engineersprivacy-conscious devs

Key capabilities

Works with

Code

Outputs

Code files
git commits
diffs
terminal output

Mobile access

How to use Aider on phones and tablets.

Not optimized for mobile browsers (e.g. desktop-first or CLI). Use a desktop when possible.

Free Tier

Free and open-source (Apache 2.0); uses your own LLM API key

Limits: Unlimited (API costs apply); supports many LLM providers

When to upgrade: N/A (fully free); upgrade LLM provider for better results

Technical Details

Type: web

Offline: No

API: No

Languages: All major programming languages

Integrations: Git (native), any LLM (OpenAI, Anthropic, Google, Ollama, etc.), terminal

Alternatives

Cursor

by Anysphere

AI-first IDE with deep codebase understanding

FreemiumIntermediateAI Coding & DevelopmentWeb

Free: 2 weeks Pro trial; then free tier with 50 premium requests/mo; unlimited completions; community model

Claude Code

by Anthropic

Terminal agentic coding agent

EnterpriseAdvancedAI Coding & Development

Free: No free tier; requires Claude Max ($100-200/mo) or API billing

OpenAI Codex CLI

by OpenAI

Open-source terminal coding agent

FreeAdvancedAI Coding & Development

Free: Free and open-source; uses your own OpenAI API key

Gemini CLI

by Google

Open-source terminal AI coding agent

FreeAdvancedAI Coding & Development

Free: Free and open-source; uses free Gemini API tier (1,000 requests/day)