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CLUSTER BROWSER-PROOFS-DEVELOPMENT · 9 ENTRIES · EARLIEST ENTRY 2026-09-23

Web-based proof IDEs

This cluster consists of web-based integrated development environments for writing and checking formal proofs in a browser, with a focus on the Coq proof assistant and similar theorem prover languages. The dated entry history is too thin to read a shape from—only one entry predates the index start, and the other members have no source date. Traction leaders, based on activity signal, are TLA+ Toolbox and jsCoq, though all listed leaders show 0 stars.

Entry timeline

ENTRY TIMELINE

MAR 2020: 1MAY 2024: 1AUG 2026: 2SEP 2026: 4OCT 2026: 1
MAR 2020OCT 2026

Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.

Members by activity

Activity signals, not revenue.

Build origin · 3 hand-coded · 6 unlabelled

Operator · 2 hobby · 5 open source · 2 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 9 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01leanstudio3★22 dayslivehobbyDesktop IDE for formal theorem proving that independently re-checks proofs and integrates AI assistants.
  2. 02Prove-It1★4 days—AI-assisted workspace that helps mathematicians explore proofs and verify formalized arguments through a human-guided interface.
  3. 03counterexample-proof-coach0★29 days—hobbyWeb app that finds minimal counterexamples to discrete-math conjectures and shows the failed proof obligation for learners.
  4. 04TLA+ Toolbox0★11 mostaleliveopen sourceIDE for writing and verifying TLA+ specifications, including parsing, model checking, and proof tools.
  5. 05tuProlog IDE0★2 yrabandonedliveopen sourceIDE for developing and running Prolog programs using the tuProlog logic programming framework.
  6. 06jsCoq – Use Coq in Your Browser0★unknownliveWeb-based IDE for the Coq proof assistant, enabling users to write and check formal proofs in a browser.
  7. 07jsCoq – Use Coq in Your Browser0★unknownlivehand-codedopen sourceWeb-based interactive development environment for writing and checking formal proofs in the browser.
  8. 08jsCoq – Use Coq in Your Browser0★unknownlivehand-codedopen sourceBrowser-based IDE for writing and checking Coq theorem proofs interactively.
  9. 09jsCoq – Use Coq in Your Browser0★unknownlivehand-codedopen sourceBrowser-based integrated development environment for writing and running proofs in a theorem prover language.

Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.