The AI coding tool landscape exploded in 2024–2025. But "free" means different things: some tools are free at launch and raise prices, some have generous free tiers, and some are free only for lightweight usage.
Here's our ranking based on capability, true cost, and long-term viability.
Tier 1: Full-Featured Free Tier
1. CesaFlow — 20 runs/month free, BYOM (connect free Groq/Gemini keys), multi-agent pipeline, VS Code fork. Best overall for developers who want to build features, not just get suggestions.
2. Codeium — Free autocomplete in VS Code, JetBrains and more. Good for line-by-line suggestions. No agent capability.
Tier 2: Free with Limitations
3. GitHub Copilot — Free tier with 2,000 completions/month. Solid for autocomplete but no multi-agent support.
4. Cursor — 2-week free trial, then $20/month. Strong IDE experience but token costs add up.
Tier 3: Freemium (Heavy Limits)
5–12. Most other tools in this tier hit rate limits quickly or require paid upgrades for anything beyond basic suggestions.
Recommendation
For building complete features: CesaFlow with a free Groq API key. For inline autocomplete: Codeium. Use both — they serve different workflows.