Recast is listed as Open Source. Check https://github.com/rot13maxi/recast for the current plan limits, as vendors change pricing frequently.

Recast

Q: What is Recast?

Recast is a code AI tool listed on Use AI Tools. Recast is a Smalltalk application that uses an LLM to repair itself while it runs. A failing call supplies the stack, method source, receiver state and tests, and a separate VM checks the proposed repair before the application replaces the method in its live image.

Q: What is Recast best for?

Recast is commonly used for Exploring self-repairing applications, Studying live method replacement, Experimenting with runtime evidence for repairs. It supports English.

Code⚡ Advanced✅ Global access

Exploring self-repairing applicationsStudying live method replacementExperimenting with runtime evidence for repairs

Open SourceEnglish

Recast is a Smalltalk application that uses an LLM to repair itself while it runs. A failing call supplies the stack, method source, receiver state and tests, and a separate VM checks the proposed repair before the application replaces the method in its live image.

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🎯 Real-World Use Cases

Let it repair

The first call fails, investigation and verification run asynchronously, the image applies the accepted patch, and the next call succeeds.

Check before applying

A separate VM verifies a proposed repair before the running application adopts it, with no rebuild or restart.

Try the tour

GUIDE.md walks through booting, editing live code, breaking the app and promoting the result, with an offline fake LLM option.

⚖️ Honest Review

✅ Pros

+No rebuild or restart: subsequent calls use the new code immediately
+Verification is a separate step, not a blind patch
+Exercised with a real LLM on Pharo 12

⚠️ Cons

−An experiment in Smalltalk, not a production self-healing framework
−Needs a Smalltalk image and a guided tour to get anything running

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CodeOct 26, 2026