🌡️ wetbulb — the newest one
"It's only 35 °C."
Heat kills more people than any other kind of weather, and every warning reports the wrong number. Air temperature says almost nothing about whether a body can shed heat — the wet-bulb temperature decides it. At 45 °C in dry desert air a healthy person sweats and survives; at 35 °C in humid air they cannot.
The page is a psychrometric state chart, because the insight is positional: the cooler-looking air is the deadly one. It also tells you the thing no heat advice gets right — that in humid heat above 35 °C a fan still helps, and in dry heat it makes things worse.
→ open it · Web · offline, no account
Every one of them takes a sentence developers say every day without checking, and makes it checkable.
🧬 mutant
Green means the tests pass. It does not mean they would go red if the code
were wrong.
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Backup software reports that it ran. That is a different claim from the data
can come back.
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🧭 portlint
Ten rules, each predicting a specific failure on a named platform — the ones your own machine cannot show you, because it is the machine where they work.
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🎯 hitrate
Record predictions, resolve them, find out what your confidence is worth. And until there is enough data, it says so instead of guessing.
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🔏 proofrun
Turns a command run into a record — exit code, output digest, commit, machine —
that anybody can re-check later. Run
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Each tool refuses to state a conclusion its evidence cannot support.
A tool that reports a confident number from thin evidence is doing the very thing you reached for it to stop doing. |
Not a marketing line — the measured list. Each of these was found by running the tool on itself or on real input, and each has a regression test that was verified to fail without the fix.
| Tool | What it caught |
|---|---|
| mutant | __pycache__ served bytecode compiled from a previous mutant: verdicts were decided by stale bytecode, and the tree was left poisoned. With the fix removed, three fully pinned mutations all falsely survive — a binding score of 0 % where the truth is 100 %. |
| mutant | Run on its own source it scored 45 % and pointed straight at the recovery path — the code deciding whether your files come back. Those gaps are closed; it now scores 58.3 %, and the remaining survivors are documented as cosmetic rather than quietly chased. |
| restoreprobe | ZIP stores local timestamps, not UTC. Reading them as UTC dated every archive written east of Greenwich into the future — and a backup dated in the future can never be reported as stale. The age check was silently dead for most of the world. |
| portlint | Its own absolute-path rule fired on the documentation explaining the rule. A linter that cries wolf gets switched off, and then it catches nothing. It reads .gitignore now, and prose is no longer treated as code. |
| proofrun | Asked to verify its own test suite, it said DIFFERENT — correctly. Node's TAP summary prints # duration_ms 3396.35, space-separated; the pattern required a colon, so an ordinary node --test run could never be verified. |
| wetbulb | Rendering the page and looking at it caught two things reasoning had not: the ventilation window told people to open up at 17:00 into 34 °C air for a 1.3 °C gain, and the first fix for an apparent overflow was an overflow-x: hidden that hid the symptom — the overflow turned out to be the screenshot rig, which will not lay out below ~496 px. |
| hitrate | Has no browser in CI, so its smoke test builds getElementById from the real id list in index.html. Rename a section and the test names it. Verified by doing exactly that. |
Every one ships with the same four things, because a tool that asks you to verify things should be verifiable itself:
- A runnable example that is honest about what it shows — the weak test suite really is weak, the sabotaged backup really is broken.
- README output that was copied from a real run, never typed.
- An "Honest limits" section, naming what the tool cannot do and what to use instead.
- CI on Linux, macOS and Windows, including a job that asserts the tool still catches its own demo. A check that cannot go red is not a check.
MIT licensed · built in the open · issues and corrections welcome