What is the difference between Cline and aider?

Aider is a terminal pair programmer. Cline is an editor and terminal agent with Plan and Act modes, MCP, and enterprise controls.

How much does Cline cost?

Cline is free for individual developers; users pay AI inference costs through BYOK or Cline provider usage.

Aider is worth testing if you prefer terminal and git workflows and already manage model API keys.

Aider vs Cline – flowtools

Aider and Cline are open-source AI coding tools for developers who want control over models and code changes. Aider is built around terminal pairing inside an existing git repo. Cline gives you a broader workflow in VS Code, terminal, CI, and MCP-connected tools.

Quick Verdict

Choose Aider if you want the lightest path to AI pair programming from a shell. Choose Cline if you want a reviewable agent that plans first, edits across files, runs commands, and can extend through MCP or enterprise controls.

Side-by-Side Comparison

Decision point	Aider	Cline
Git commit behavior	Auto-commits, diffs, and undo are central safety tools	Checkpoints, diffs, approvals, and one-click undo guide changes
Repo map	Builds a map of the codebase for larger projects	Uses codebase context, rules, multi-root workspaces, and agent tools
Plan and Act flow	Conversation-driven terminal edits	Plan mode separates reasoning from Act mode edits
MCP marketplace	Can use external tools through model and shell setup	MCP marketplace and servers are first-class workflow pieces
Enterprise control surface	Not presented as a hosted enterprise plan	Custom Enterprise with JetBrains, SSO, RBAC, audit logs, and SLA
Cost model	Open-source CLI with provider model costs	Free for individuals, pay inference usage

Features and Workflow

Aider is direct. You install the CLI, open a project directory, choose a model, add files or let Aider map the repo, and ask for changes. Its package highlights git integration, diffs, auto-commits, /undo, linting, testing, images, web pages, and voice-to-code.

Cline is broader. Cline offers Plan mode, Act mode, live terminal command output, .clinerules, MCP servers, Slack, Discord, Linear, CI use, and multi-root workspaces. Cline's free individual tier includes the VS Code extension, CLI, MCP marketplace, and multi-root workspaces, while Enterprise unlocks JetBrains and centralized controls.

Pricing Comparison

Aider is an open-source terminal CLI and no vendor subscription was found on the Aider site as of June 2026.
Aider model and API costs depend on the provider you choose, such as OpenAI, Anthropic, DeepSeek, or a local model.
Cline Open Source is free for individual developers as of June 2026.
Cline users pay only for AI inference, either with their own API keys or usage-based Cline provider credits.
Cline Enterprise is custom priced and adds JetBrains, SSO, SLA, centralized billing, team dashboard, RBAC, provider limits, and authentication logs.

Pick Aider If

You want a small CLI that fits existing shell habits.
You prefer git commits, diffs, and undo as the main safety layer.
You already manage model keys and provider choice.
You do not need a team dashboard or SSO.

Pick Cline If

You want an agent inside VS Code plus a CLI for automation.
You need Plan and Act separation before edits happen.
You want MCP servers or custom tool hooks.
You may need enterprise controls later.

Honest Verdict

Aider is the better fit for terminal-first developers who want a focused pair programmer. Cline is the stronger pick when the agent needs to inspect, plan, run commands, and connect to a wider tool surface. The tradeoff is simplicity: Aider is easier to reason about, while Cline carries more agent infrastructure.

Aider vs Cline

Aider and Cline are open-source coding agents, but Aider stays close to the terminal while Cline adds VS Code, CLI, MCP, and enterprise options.