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Forall

Name: Forall
Author: 9bests.com

A coding agent from Astrio that helps developers build correct software by generating spec-driven code alongside machine-checkable proofs. Run it as a full CLI or as an MCP verify-only layer inside Cursor, Claude Code, or Codex.

★★★★☆ 4.3 Free (Open Source)

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📖 9bests In-Depth Review Jul 26, 2026

Forall Review 2026: The Coding Agent That Proves Its Code Is Correct

Forall is a spec-driven coding agent from Astrio that generates code alongside machine-checkable proofs. We review how it works, its MCP verify-only mode, and who should use it.

Read the full long-form review & analysis →

💡 9bests Editorial Buying Advice

Why choose Forall: A coding agent from Astrio that helps developers build correct software by generating spec-driven code alongside machine-checkable proofs. Run it as a full CLI or as an MCP verify-only layer inside Cursor, Claude Code, or Codex.

Optimal workflow match: Ideal for teams seeking automated and streamlined AI workflows.

✅ Pros / Key Advantages

• Spec-driven code generation with machine-checkable proofs
• Full CLI coding agent — specs, proofs, and workflow in your terminal
• MCP verify-only mode — add hosted verification without leaving Cursor, Claude Code, or Codex
• Supports TypeScript, Java, and Rust (more languages on the way)
• Bring-your-own-model (OpenAI / OpenRouter) or a Forall account API key

❌ Cons / Limitations

• Young project — only TypeScript, Java, and Rust supported so far
• Proof generation adds workflow overhead versus plain codegen
• Requires a Forall account or model API key to start

💰 Pricing Plans & Structure

Free (Open Source)

Pricing details are gathered from public sources and are subject to change. Please visit the official website for real-time rates and trial terms.

Pricing verified from official public sources · Reviewed by Bill (Lead Editor)

🎯 Who should use Forall

Best suited for users focused on digital productivity and AI automation who value spec-driven code generation with machine-checkable proofs.

⚠️ Who should look elsewhere

Users who require features outside its core scope or cannot accommodate young project — only typescript, java, and rust supported so far may benefit from exploring alternative tools in this category.

🚀 Common use cases

Autocompleting and refactoring code

Multi-file AI edits

Debugging and test generation

⚖️ Direct Head-to-Head Comparisons

Curated Matchups

Compare Matrix → Free (Open Source) vs Free / $20/mo

Forall vs Cursor

Side-by-side analysis of features, scores, pros, and cons.

Compare Matrix → Free (Open Source) vs $10-39/mo

Forall vs GitHub Copilot

Side-by-side analysis of features, scores, pros, and cons.

Compare Matrix → Free (Open Source) vs Free / $15/mo

Forall vs Windsurf (Codeium)

Side-by-side analysis of features, scores, pros, and cons.

Compare Matrix → Free (Open Source) vs Free / $25/mo

Forall vs Replit Agent

Side-by-side analysis of features, scores, pros, and cons.

❓ Frequently asked questions

Is Forall free?

Pricing for Forall is available on its official site.

What is Forall used for and what are its strengths?

Key strengths of Forall: Spec-driven code generation with machine-checkable proofs, Full CLI coding agent — specs, proofs, and workflow in your terminal. A coding agent from Astrio that helps developers build correct software by generating spec-driven code alongside machine-checkable proofs. Run it as a full CLI or as an MCP verify-only layer inside Cursor, Claude Code, or Codex.

What is the best alternative to Forall?

If you're looking for an alternative to Forall, consider Cursor: it stands out for Best AI code editor, Multi-file editing.

How do I choose the right alternative to Forall?

Selection advice: compare ratings, pricing, and core features within the AI Coding category, then match to your own workflow. See the comparison matrix and Top alternatives list on this page.