home humidity log

Humidity log: 14 days, in the browser

Record temperature and relative humidity for two weeks. Dew point is calculated each day. Data stays on your device.

You want to know whether indoor air is persistently damp, not just in one moment.

  1. Measure in the same spot, away from radiators and open windows.
  2. Enter T and RH: dew point is a Magnus estimate, not a certificate.
  3. After at least three days, read the summary. One measurement is not a climate.

A free digital product. Fields stay in the browser, not on the server. Do not type names or emails.

Days filled

0

Average RH

Average dew

You need at least three days with T and RH for a useful reading. One measurement is not a climate.

DayT °CUR %Dew (est.)LaundryNotes
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A free digital product. A longer version with extra charts is under review: it will not be sold until it is actually more useful than the free one.

Useful next step

If RH stays high, calculate dew point and run the guided diagnosis before you buy.

What may help (after diagnosis)

No affiliate link is live. Products below are categories, not model reviews.

10–25 €

Digital hygrometer (probe if you can)

Without a relative-humidity number, every tip is guesswork. A €10–25 hygrometer is the first useful purchase — before any dehumidifier.

When: Always, as the first diagnostic step.

Not when: It does not replace a moisture meter or a rising-damp survey.

Affiliate link not connected — a category, not a model review.

20–80 €

Room sensor (T / RH, optional data logger)

Useful for a one-week log. A log beats a single reading, especially in winter.

When: Recurring condensation, night-versus-day doubts.

Not when: It is not a professional alarm system.

Affiliate link not connected — a category, not a model review.

FAQ

Does this data go to a server?+

No. It stays in the browser (localStorage). Do not type names, emails or addresses.

Why 14 days, not one?+

Condensation and mould depend on duration, not a single reading. Three days are the useful minimum; two weeks catch weekends and laundry.

Is there a paid version?+

Not yet. A longer version with extra charts is under review. We will not sell it until it is more useful than this free one.

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