Comparison

Aider vs Cline

Aider vs Cline in 2026: two open-source AI coding agents. Aider is the mature git-aware CLI; Cline is the VS Code extension with per-step approval. Which fits which workflow?

Short answer

Aider is the longest-running open-source CLI, git-aware, auto-commits per turn, terminal-native, battle-tested since 2023. Cline is the open-source VS Code extension with per-step approval and a polished IDE experience. Pick Aider for terminal + git purity; pick Cline for the VS Code workflow.

Aider

Open source community

Git-aware AI pair-programming CLI

Best for: Engineers who want a mature, transparent, BYO-model CLI with auto-commit diffs.

Visit Aider →

Cline

Cline Bot Inc.

Open-source autonomous coding agent for VS Code

Best for: Engineers who want open source, BYO API key, per-step approval inside VS Code.

Visit Cline →

Feature comparison

License

AiderApache 2.0
ClineApache 2.0

Interface

AiderCLI only
ClineVS Code extension

Git integration

AiderEdgeNative, auto-commits every turn
ClineVia shell tool, no auto-commit

Model flexibility

AiderAny (via litellm)
ClineAny (BYO key)

Per-step approval UI

AiderNo, runs through full turn
ClineEdgeYes, approve every action

MCP support

AiderLimited (community work in progress)
ClineEdgeNative

Maturity

AiderEdgeMature, battle-tested since 2023
ClineMature, popular 2024-2026

Pricing

AiderFree (BYO API key)
ClineFree (BYO API key)

Pick Aider when

  • →You live in the terminal
  • →You want auto-commit per turn with clean diffs
  • →You're price-sensitive and want a battle-tested CLI
  • →You want the simplest, most stable open-source agent

Pick Cline when

  • →You want a VS Code extension
  • →You want per-step approval before each tool call
  • →You want native MCP and skills via skills-hub
  • →You want a more polished UI than a terminal

Verdict

Aider is the right pick if your workflow is terminal + git, and you value auto-commit-per-turn (every change is already a clean diff). Cline is the right pick if your workflow is inside VS Code and you want per-step approval. Both are free, Apache 2.0, BYO model, pick by interface preference.

Frequently asked questions

Are they both fully free?

Yes, both are free to install. You only pay for the underlying API tokens (Claude, GPT, Gemini, etc.) at provider rates.

Can I use the same model in both?

Yes. Aider uses litellm under the hood; Cline supports any provider you can BYO key for. Claude Opus 4.7, GPT-5.5, Gemini 3.1 Pro all work.

Which is easier to start with?

Cline, VS Code extension means click-install + paste key. Aider needs pip install + CLI familiarity but is the simpler tool conceptually.

Do skills work in both?

Cline has full MCP and skills support via skills-hub. Aider MCP support is community work-in-progress; you can manually paste SKILL.md content into Aider's system prompt.

Which is more autonomous?

Aider, it runs full turns without asking. Cline asks for approval on each step by design.

Related comparisons

Claude Code vs Aider
Claude Code wins on agent autonomy, sub-agents, scheduled tasks, and IDE integrations. Aider wins on simplicity, git-awa…
Cline vs Cursor
Cline wins on transparency, open source, and BYO-API-key flexibility. Cursor wins on inline tab-completion, ecosystem ma…
Claude Code vs Cursor
Pick Claude Code if you want a terminal-native agent with deep file-system access, parallel sub-agents, and the best Cla…

Install skills that work in both

Skills follow the open Agent Skills standard, install once, use in any AI tool.

Browse 4,900+ skills →