JevDev: Open-Source UI for Experimenting with Jev by Typesafe.ai

Melvin Vivas · X post · 2026-09-29 · Open on X

Topics: AI Dev Tools & Productivity, Portfolio Projects · Level: intermediate

Summary

The creator shares the first push of JevDev, an open-source GitHub repo with a UI for experimenting with Jev by Typesafe.ai. It's a small example of building your own tool around an AI product.

Key points

• JevDev is a UI tool for experimenting with Jev by Typesafe.ai.
• The code is public on GitHub at donvito/jev-dev.
• This is the first push, so expect it to be early-stage.
• A related post says the tool keeps a history of Jev sessions and was built with Codex and Astra.

Resources mentioned

• donvito/jev-dev · repo · github.com · free
  UI tool for experimenting with Jev by Typesafe.ai that keeps a history of past runs.
  Also in: Generating a Repo Promo Video with a Claude Skill on Sonnet 5.5 vs Opus 5.5 (Melvin Vivas on X · notes), JevDev: Open-Source UI Tool for Experimenting with Jev (Typesafe.ai) (Melvin Vivas on X · notes), jev-dev: A UI Tool to Keep Run History When Experimenting with Jev (Melvin Vivas on X · notes)
• Jev (TypeSafe AI) · tool · typesafe.ai · free
  TypeSafe's new post-training algorithm for calibrated, confidence-scored decisions, pitched as a replacement for RLHF.
  Also in: JevDev: Open-Source UI Tool for Experimenting with Jev (Typesafe.ai) (Melvin Vivas on X · notes), jev-dev: A UI Tool to Keep Run History When Experimenting with Jev (Melvin Vivas on X · notes), Building a Jev Session-History Tool with Codex and Astra (Melvin Vivas on X · notes), Model Routing: Fine-Tune Your Own Router on Your Prompts (Melvin Vivas on X · notes) and 7 more

Try this

• Clone the jev-dev repo to try Jev experiments through a UI.
• Build a UI tool for an AI product that lets you run experiments and keeps a history of sessions.