Aider — Apache-2.0 licensed, permanently free, and the only tool here whose price has never changed — you pay your model provider and nothing else.
Short answer: Aider is a terminal-based AI coding agent released under the Apache 2.0 licence and installed via pip. The tool itself is free with no paid tier and no subscription; you pay only your chosen model provider’s API costs. Reported typical spend for active developers is $30 to $60 a month, with a coding session costing roughly $0.50 to $3.00 on a frontier model, or nothing at all running local models through Ollama.
On this page
Verdict at a glance
Overall rating: 4.5/5 ★★★★☆
Standout: Every edit is automatically committed to git with a descriptive message. Aider treats version control as the interface rather than as an afterthought.
Watch out: There is no support contract and no vendor to escalate to. Aider is a community project — excellent, well-maintained and free, but you are on your own.
Aider is the purest expression of the bring-your-own-model approach and it is very good. Released under Apache 2.0 and installed with a single pip command, it runs in the terminal, works with Claude, GPT, Gemini and local models through Ollama, and — its best design decision — commits every edit to git automatically with a descriptive message. That means the AI’s work arrives as a reviewable history rather than as a diff you have to reconstruct, which is the difference between an agent you can trust with a real repository and one you cannot. The economics are unusual in this category: the tool costs nothing, has never had a paid tier, and its price has been verified stable at zero across its entire tracked history. You pay your model provider directly, with reported typical spend of $30 to $60 a month for active developers, individual sessions costing roughly $0.50 to $3.00 on a frontier model, and $0 if you run local models via Ollama. Against Devin at $20 a month on Pro or Kiro at $20 for 1,000 credits, paying inference at cost with no margin on top is a materially different proposition. The trade is support: there is no vendor, no SLA and nobody to escalate to.
Quick facts
| Attribute | Detail |
|---|---|
| Ideal team | Developers comfortable in a terminal who want inference at cost |
| Learning curve | Low for terminal users; it behaves like a CLI tool |
| Setup time | Minutes — install via pip and add an API key |
| Free trial | ⭐ The tool is permanently free |
| Free tier | ⭐ Entirely free under Apache 2.0 |
| Real cost | Your model provider’s API charges only |
| Reported spend | $30-$60 a month for active developers |
| Key limit | ⚠️ No vendor, no SLA, no support contract |
Overview
Aider is an open-source AI coding agent that runs in the terminal, released under the Apache 2.0 licence and installed via pip. It supports Claude, GPT, Gemini and local models through Ollama, so you choose the model and pay its provider directly rather than paying a vendor’s marked-up rate. With roughly 40,000 GitHub stars it is among the most widely used open-source coding tools available, and its price has been verified stable at zero across its entire tracked history — no paid SKU has ever been added.
The design decision that distinguishes it is git integration. Every edit Aider makes is automatically committed with a descriptive message, so the AI’s work arrives as a reviewable history rather than as an accumulated diff you have to untangle afterwards. For anyone letting an agent work in a real repository that is the difference between something you can supervise and something you have to audit — and it makes reverting a bad suggestion a single git command rather than a manual reconstruction.
The cost structure is genuinely different from the rest of this category. There is no subscription at any level. Reported typical spend for active developers is $30 to $60 a month in API charges, with an individual coding session costing roughly $0.50 to $3.00 on a frontier model such as Claude, and nothing at all when running local models via Ollama. Compare that with Devin at $20 a month on Pro, Kiro at $20 for 1,000 credits with $0.04 overage, or Replit at $17 a month annually: paying inference at cost with no vendor margin is a structurally cheaper arrangement for anyone whose usage is significant. What you forgo is a vendor — no support contract, no SLA, nobody to escalate to when something breaks.
Key features
- Apache 2.0 licence — ⭐ permanently free, no paid tier ever added
- Automatic git commits — ⭐ every edit committed with a descriptive message
- Terminal-based — works alongside your existing tooling
- Model agnostic — Claude, GPT, Gemini and others
- Local model support — run via Ollama for zero API cost
- Pay providers directly — inference at cost with no vendor margin
- pip install — setup in minutes
- Repository-aware editing — works across multiple files
- Large community — roughly 40,000 GitHub stars
- No subscription — price verified stable at $0 throughout
Pricing (as of 2026-10-01)
Model: free and open source; you pay your model provider’s API costs directly · Free tier: ⭐ the entire tool is free under Apache 2.0 · Entry paid: $0 — API costs only
| Plan | Price | Includes |
|---|---|---|
| Aider | ⭐ $0 — Apache 2.0 licence | The complete tool with all features · installed via pip · no paid tier has ever existed · price verified stable at $0 across its tracked history |
| Model API costs | Paid directly to your provider | Reported $30-$60 a month for active developers · roughly $0.50-$3.00 per coding session on a frontier model such as Claude |
| Local models | ⭐ $0 | Run via Ollama for no API cost at all, at the expense of frontier-model capability |
⭐ Aider has never had a paid tier and its price has been verified stable at $0 across its entire tracked history. You pay your model provider directly, so inference costs you what it costs — no vendor margin on top, which is structurally cheaper than every subscription tool in this comparison at meaningful usage.
Reported typical spend is $30 to $60 a month for active developers, with individual sessions at roughly $0.50 to $3.00 on a frontier model. Running local models through Ollama reduces that to zero, trading frontier capability for no marginal cost.
⚠️ There is no vendor, no support contract and no SLA. Aider is a community project — well-maintained, widely used and genuinely free — but when something breaks there is nobody to escalate to. Weigh that against the cost saving rather than ignoring it.
Ratings breakdown
| Criterion | Score | Why |
|---|---|---|
| Ease Of Use | 4.0/5 | Straightforward for terminal users; a CLI rather than an IDE |
| Features | 4.5/5 | Model-agnostic with genuinely excellent git integration |
| Value | 5.0/5 | Free tool, inference at cost, no margin anywhere |
| Support | 3.0/5 | ⚠️ Community only — no vendor, SLA or escalation path |
Pros
- Completely free under Apache 2.0, with no paid tier ever added
- Every edit automatically committed to git with a descriptive message
- Model agnostic across Claude, GPT, Gemini and local models
- Pay your model provider directly — inference at cost, no margin
- Local models through Ollama reduce marginal cost to zero
- Installs in minutes via pip
- Roughly 40,000 GitHub stars and an active community
- Price verified stable at $0 across its entire tracked history
Cons
- ⚠️ No vendor, no support contract and no SLA
- Terminal-based, which suits some workflows and not others
- No managed billing — you handle provider API keys yourself
- API costs are variable and depend on model choice and usage
- No enterprise features such as SSO or centralised administration
- Local models via Ollama trade capability for cost
- Requires comfort with git and command-line workflows
Who it’s for
- Developers comfortable in a terminal who want inference at cost
- Teams who prefer paying model providers directly over vendor margins
- Anyone who wants AI edits arriving as reviewable git history
- Developers running local models who want zero marginal cost
Who it’s not for
- Teams needing a support contract or SLA
- Organisations requiring SSO and centralised administration
- Developers who want an IDE rather than a terminal tool
- Anyone unwilling to manage their own provider API keys
Best use cases
- Editing across a repository with every change committed automatically
- Running a frontier model at provider cost rather than a vendor rate
- Working entirely offline with local models through Ollama
- Reverting an unwanted AI change with a single git command
- Switching models freely without changing tools or subscriptions
Integrations
Aider’s integration is git, and treating version control as the primary interface rather than an afterthought is what makes it trustworthy in a real repository. Beyond that it connects to whichever model provider you configure — Anthropic, OpenAI, Google or a local Ollama instance — which means your integration surface is your own API keys rather than a vendor’s connector list. Simple, and entirely under your control.
How it compares
| Aider | Cline | Kiro | Devin | |
|---|---|---|---|---|
| Tool cost | ⭐ $0, Apache 2.0 | ⭐ $0, open source | $20/mo (Pro) | $20/mo (Pro) |
| Inference | ⭐ Pay provider directly | ⭐ Pay provider directly | Credits at $0.04 overage | Included in the plan quota |
| Reported real spend | $30-$60/mo API | $5-$50/mo typical | $20-$200/mo by tier | $20-$200/mo by plan |
| Git integration | ⭐ Auto-commit per edit | Standard | Standard | Standard |
| Interface | Terminal | VS Code extension | ⭐ Full IDE | Autonomous agent |
| Support | ⚠️ Community only | Enterprise tier available | AWS-backed | Vendor-backed |
| Best fit | Terminal agent, inference at cost | Open-source agent in VS Code | Spec-driven agentic IDE | Autonomous engineering |
Replit prices are vendor-published and verified 2026-09-25. Cline, Aider, Kiro and Devin figures are from published third-party reporting where the vendors’ own pages could not be retrieved directly.
Alternatives
Cline applies the same bring-your-own-key economics inside VS Code rather than the terminal, and adds an optional hosted billing path. Kiro is AWS’s spec-driven agentic IDE with credit pricing. Devin is an autonomous agent on a subscription, from $20 a month on Pro. Replit provides a browser IDE with an agent, from $17 a month annually.
Recent changes
Aider remains free and open source under the Apache 2.0 licence, installed via pip, with no paid tier and no subscription of any kind — its price has been verified stable at $0 across its entire tracked range, with no paid SKU ever added. Users pay only the API costs of whichever LLM provider they choose, or nothing at all when running local models via Ollama. Reported typical monthly spend for active developers is $30 to $60, with an individual coding session costing roughly $0.50 to $3.00 using a frontier model such as Claude. The tool continues to support Claude, GPT, Gemini and local models, integrates directly with git so that every edit the AI makes is automatically committed with a descriptive message, and remains among the most popular open-source AI coding tools with roughly 40,000 GitHub stars.
Frequently asked questions
Is Aider really free?
Yes, entirely — it is released under the Apache 2.0 licence, installs via pip, and has never had a paid tier. Its price has been verified stable at $0 across its tracked history. You pay only your chosen model provider’s API costs, which is a genuinely different arrangement from every subscription tool in this comparison.
What does Aider actually cost to run?
Reported typical spend for active developers is $30 to $60 a month in model API charges, with an individual coding session costing roughly $0.50 to $3.00 on a frontier model such as Claude. Running local models through Ollama reduces that to zero, trading frontier capability for no marginal cost at all.
Why does Aider’s git integration matter?
Because every edit is automatically committed with a descriptive message, the AI’s work arrives as a reviewable history rather than as an accumulated diff you have to untangle. Reverting a bad suggestion becomes a single git command. For anyone letting an agent work in a real repository, that is the difference between supervision and archaeology.
Aider or Cline?
Both are free and open source with pay-your-own-provider economics. Cline runs as a VS Code extension and offers an optional hosted billing path plus an Enterprise tier with SSO and an SLA. Aider is terminal-based with stronger git integration. Choose on where you work rather than on cost, since both are $0.
What is the catch with free AI coding tools?
Support. Aider has no vendor, no support contract and no SLA — when something breaks, there is a community and nothing else. For individual developers that is usually an acceptable trade for paying inference at cost; for organisations with procurement requirements it can be disqualifying regardless of the saving.
Can I run Aider without paying anything at all?
Yes, using local models through Ollama — the tool is free and local inference has no API cost. You trade frontier-model capability for zero marginal cost, which suits privacy-sensitive work or high-volume experimentation. For production-quality output most developers use a frontier model and accept the $30 to $60 monthly spend.
Which models does Aider support?
Claude, GPT, Gemini and local models through Ollama, among others — you configure your own provider keys and can switch freely without changing tools or subscriptions. That model portability is a structural advantage over vendor-locked assistants, since you are never dependent on one provider’s pricing or availability.
Sources
- AI Productivity — Aider pricing 2026: free open-source, all features included
- Ivern AI — Aider review 2026: free AI coding agent tested
- Costbench — Cline pricing 2026: 3 plans from free to $20/month
- Replit — official pricing page
Compiled from public sources; last verified 2026-10-01. Pricing is subject to change — verify with the vendor. Ratings reflect editorial opinion based on documented capabilities, published pricing, and aggregated user reviews. DigiJaws does not accept payment for review placement or rating.
Aider Review (4.5/5): Pricing & Verdict (2026). DigiJaws, 2026. https://digijaws.com/reviews/aider-review/