How we rated it
4.3
out of 5
Weighted score: features & compliance (25% each), ease of use & value (20% each), support (10%).
- Features & depthBreadth and quality of capabilities4.3
- Compliance & securityData handling, certifications, privacy posture4.6
- Ease of useHow intuitive and frictionless the tool is3.6
- Value for moneyPricing vs. what you get5.0
- Support & reliabilityUptime, support quality, vendor responsiveness3.8
Key facts
- Starting price
- $0/month
- Pricing model
- Usage-based
- Free tier
- Yes
- Free trial
- No
- Trains on user data
- No
- Launched
- 2023
- Platforms
- Cli, Macos, Windows, Linux
- HQ
- Open source project
- Last updated
- July 2026
About Aider
Aider is a free, open-source AI coding agent that runs in your terminal. Its defining trait is Git-first design: every change Aider makes becomes a well-described, reviewable git commit, so rolling back or auditing the AI's work is trivial. It builds an internal map of your repository to operate effectively across large projects, supports 100+ programming languages, and can run your linters and tests after each change — feeding failures back to the model so it self-corrects.
Its second defining trait is that it's model-agnostic. Aider is not tied to any vendor: you connect it to Claude, GPT, DeepSeek, Gemini, or a local model via Ollama, and you pay only for the tokens the underlying model consumes — or nothing at all when running locally. That means no subscription, no seats, and no lock-in, and it's the practical choice for air-gapped or highly private environments where code cannot leave your machine.
The trade-off is that Aider is purely a terminal tool with no GUI, and it requires comfort with the command line and API-key management. It's Apache-2.0 licensed and community-supported rather than backed by commercial SLAs.
Pricing breakdown
Open source
Free
free (Apache 2.0)
- Fully free and open source — no subscription or seats
- You pay only for the LLM API tokens you use
- Near-zero cost with local models via Ollama
All features
Git-first workflow — every AI edit becomes a reviewable, well-described commit
Repo map that gives the model awareness of your whole codebase
Model-agnostic — works with Claude, GPT, DeepSeek, Gemini, or local models
Runs your linters and tests after each change and self-corrects on failures
Supports 100+ programming languages
Fully local operation possible via Ollama — no code leaves your machine
Integrations
| Integration | Type | Notes |
|---|---|---|
| git | Native | — |
| Anthropic / OpenAI / Google APIs | API | — |
| Ollama (local models) | Native | — |
Pros and cons
What it does well
- Completely free and open source — you pay only for the model tokens you use
- Best-in-class Git integration: every change is an atomic, reviewable commit
- Model-agnostic — cheap models for simple tasks, frontier models for hard ones
- Can run fully locally via Ollama, so code never leaves your machine
Limitations
- Terminal-only — no GUI or IDE experience
- Requires comfort with the command line and API-key management
- Not designed for fast real-time inline completion like an AI IDE
- Community-supported rather than backed by commercial SLAs
In-depth reviews
Alternatives to Aider
Claude Code
4.4 / 5
The most capable terminal-native coding agent — top-tier reasoning and a huge context window make it excellent for large-codebase and architectural work, at the cost of a terminal-first learning curve.
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Warp
4.2 / 5
The best AI-native terminal — block-based output and natural-language commands are real improvements, and it's an excellent home for CLI agents, though its free AI credits are stingy.
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Cursor
4.4 / 5
The most capable AI IDE available — Composer and Tab set the bar for codebase-aware editing — but it's VS Code-only and its usage allowance needs managing.
View profileThe verdict
The best free, open-source coding agent — unmatched Git integration and zero lock-in make it ideal for private and cost-conscious workflows, if you're comfortable in the terminal.
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