Aider

Name: Aider
Author: Aider

by Aider

Open Source Self-Hostable Free Tier open-source

Open-source command-line AI pair programmer that edits Git repositories with multi-file context and automatic commits. Aider is an open-source AI pair programming command-line tool created in 2023 by Paul Gauthier. The repository (paul-gauthier/aider, Apache 2.

Key Facts

Key facts about Aider
Attribute	Value	As of	Source
Pricing	Free Apache 2.0; users pay only model API costs	Apr 2026	Aider
Model Support	Claude, GPT-4 family, DeepSeek, Gemini, Llama via Ollama, OpenRouter (10+ providers)	Apr 2026	Aider docs
Released	2023	Apr 2026	GitHub paul-gauthier/aider
Key Differentiator	CLI-first agent with Git auto-commits, repo-map context, and a public code-edit benchmark	Apr 2026	Aider

About Aider

Aider is an open-source AI pair programming command-line tool created in 2023 by Paul Gauthier. The repository (paul-gauthier/aider, Apache 2.0) is community-maintained and actively published on GitHub and PyPI as of April 2026.

Aider runs in a terminal alongside a local Git repository. The tool builds a repo map of the codebase, sends relevant files as context to the chosen model (Claude, GPT-4, DeepSeek, Gemini, Llama via Ollama, or other providers), applies edits as diffs, and commits each successful change with a generated message. Aider supports voice coding, image input for vision models, in-chat URL fetching, and a benchmark suite that tracks code-edit accuracy across models. The tool is free; users pay only API costs to their chosen model provider, making total cost tightly correlated with token spend.

Integrations (4)

Anthropic API native

Git native

Ollama native

OpenAI API native

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See How It Ranks

Best AI Coding Tools and Developer Assistants 2026

AI coding tools have become essential for professional developers in 2026, with the category spanning full AI-native editors, IDE plugins, terminal-based assistants, and code generation platforms. This ranking evaluates the leading AI coding tools based on code suggestion quality, IDE integration depth, programming language support, pricing value, and AI model quality. The evaluation focuses on tools that directly assist developers in writing, refactoring, and understanding code. General-purpose AI chatbots that can discuss code but do not integrate into development environments are excluded.

Questions About Aider

Is Aider worth it in 2026? A detailed review

Aider scores 7.6/10 in 2026. The Apache 2.0 CLI pair programmer by Paul Gauthier supports Claude, GPT-4, DeepSeek, Gemini, and local Ollama models with Git auto-commits and a public code-edit benchmark.

How much does Aider cost in 2026?

Aider is free and Apache 2.0 licensed; users pay only for model API calls. Typical daily Claude or GPT-4 spend runs $3-$25/day for active developers in April 2026.

Learn More

comparison

Aider vs Cline 2026: Open-Source AI Coding Compared

Aider and Cline are two open-source AI coding tools that share a bring-your-own-key philosophy but ship in different form factors. Aider is a Python terminal CLI that pairs with developers via diffs and auto-commits; Cline is a VS Code extension that runs an autonomous coding agent. As of April 2026 both are Apache 2.0 licensed, free to install, and bill the developer's model API directly.