Coding · Head-to-head

Windsurf vs Aider

Windsurf (freemium, AI Score 7.2/10) vs Aider (free, AI Score 8/10). Side-by-side pricing, features, pros and cons, and which to pick.

The verdict

Pick Windsurf if…

→your primary use case is developers already productive in windsurf's cascade workflow who have no urgent reason to migrate, and teams evaluating cognition's stack who want an editor-side agent sitting alongside devin's cloud agents.
→you need: agents

Try Windsurf →

Pick Aider if…

→budget is the constraint
→overall capability matters more than price (AI Score 8 vs 7.2)
→your primary use case is terminal-centric developers who already hold their own api keys and want an ai editor that commits its own changes to git, especially anyone routing work to cheap open-weight or local models to keep cost and code under their own control.

Try Aider →

Spec	Windsurf	Aider
Category	Coding	Coding
Pricing model	freemium	free
Headline pricing	Free tier; paid plans from $20/mo (the Devin lineup now served at windsurf.com) — verify before buying	Free (BYOK — pay your LLM provider)
Free tier	Yes, but it is credit-metered and is Devin's free tier, not the unlimited-basic-completions-forever tier this entry once described. That tier no longer exists. Confirm current allowances on the live pricing page before relying on it.	The tool itself is entirely free and open-source. The only spend is LLM API usage from whichever provider you point it at, and that drops to zero if you run models locally.
AI Score	7.2/10	8/10
Best for	Developers already productive in Windsurf's Cascade workflow who have no urgent reason to migrate, and teams evaluating Cognition's stack who want an editor-side agent sitting alongside Devin's cloud agents.	Terminal-centric developers who already hold their own API keys and want an AI editor that commits its own changes to git, especially anyone routing work to cheap open-weight or local models to keep cost and code under their own control.
Editor's pick	—	—
Use cases	development agents	development
Date added	2025-06-01	2026-04-30

Coding · freemium

✓Cascade remains one of the better-designed agent loops: it plans, edits across files, runs commands, reads output and iterates without needing constant re-prompting
✓Repo-wide indexing means the agent locates the relevant files itself instead of making you paste context
✓Mixes cheap in-house SWE-series models for routine edits with frontier models for hard problems, so agent runs are not uniformly expensive
✓Enterprise self-hosted and air-gapped deployment with zero data retention, which Cursor does not offer at any tier
✓Full VS Code fork with terminal execution and file-write access, not a chat sidebar bolted onto an editor

×The founding team including CEO Varun Mohan left for Google DeepMind in July 2025 and Cognition bought what remained, so an independent product roadmap is not a safe assumption
×windsurf.com resolved to Cognition's Devin site when checked on 2026-08-10, meaning the plans a buyer actually encounters are Devin's and no Windsurf-branded price could be confirmed on any live page
×Cursor and Claude Code have caught up on multi-file agentic work, erasing the 2025 lead this entry's original 9.1 score was built on
×Pricing is credit-metered and hard to forecast for a team; the unlimited free tier that once made the product an easy recommendation is gone

⌨️

Coding · free

✓Free and Apache-2.0, with per-request token cost printed in the terminal so spend is visible rather than hidden behind a plan quota
✓Every AI edit is its own git commit, making review, blame and rollback plain git operations
✓Provider-agnostic via LiteLLM: frontier models, cheap open-weight models and fully local Ollama models all work the same way
✓Architect mode routes planning and code-writing to two different models, which cuts cost without giving up reasoning quality
✓Publishes its own polyglot code-editing benchmark and public leaderboard, so its accuracy claims are independently checkable

×Human-in-the-loop by design: it does not run the long autonomous tool-use loops that Claude Code, OpenAI Codex and Goose now offer, so unattended multi-step work is not its shape
×Extension story is thin next to MCP-native agents; check the current docs before assuming a given external tool integration exists
×Development is effectively one maintainer, a real risk for a tool whose value depends on tracking new model releases quickly
×Terminal-first and conversation-driven, with no inline completion; the add-files-to-context workflow takes real learning for developers used to an IDE assistant

Updated 2026-08-10. Spec data sourced from official product pages and tracked in our public directory at /tools.