You ventilate every day — and still you hear: "Your fault."
Record humidity, temperature and dew point room by room — with a photo and timestamp per measurement. A vague suspicion turns into a documented timeline you can put in front of your landlord or an expert.
Android only · Install once, monitor every room for good
Enter air humidity and room temperature per room — with date and time. Unlimited measurements.
Calculated offline from humidity and temperature. Shows whether the conditions for condensation and mold were present.
One photo per measurement, with a flashlight for dark corners. Rate the growth on a 5-step scale.
Structured report — photo on the left, values on the right. With history charts per room for landlord and expert.
Mold in a rented flat almost always leads to the same argument: the landlord says you ventilate or heat incorrectly — you say the cause lies in the building. Without dated readings, it stays your word against theirs. And this is exactly where many tenants lose, even though they are in the right. Around one in ten homes is affected by damp or mold, so the dispute is an everyday occurrence.
With Mold Documentation you capture the growth directly on your smartphone. You add each affected room and enter air humidity and temperature. From that, the app calculates the dew point offline — the temperature at which moisture settles on the wall. For each measurement you take a photo and rate the mold growth on a five-step scale. In the ventilation log you note when and how long you aired the room; replies from the landlord are recorded with a date too.
The result is a timeline instead of a snapshot. When the landlord asks how often you ventilated, you have the answer — with date, time and photo. All data stays on your device. No account, no server, no cloud. Home data is sensitive and is nobody's business but yours.
You air the flat morning and evening, yet the mold in the bedroom corner keeps coming back. The landlord blames your behaviour. Without readings for humidity and temperature, you can't show that the conditions for condensation weren't caused by incorrect ventilation.
At first it's just a dark shadow behind the wardrobe. You photograph nothing, think nothing of it. Three months later the spot is the size of a hand — but you have no earlier photo to show how fast the growth spread.
You reduce the rent because of the mold. The landlord disputes the extent and duration and threatens termination. Without a complete timeline of photos and readings, your reduction stands on shaky ground.
All three situations share the same pattern: without documentation, you lose. With readings, dew point, photos and a ventilation log, your suspicion becomes a timeline that holds up.
Does the app help in a dispute with the landlord about mold?
With mold, what matters is documenting the progression in a way that is easy to follow. Humidity and temperature readings with a date, a calculated dew point and photos per room show how the growth developed and how regularly you ventilated. The more complete your documentation, the stronger your position toward the landlord.
What is the dew point and why does it matter?
The dew point is the temperature at which the air releases its moisture as condensation on walls — the most common trigger for mold. The app calculates it offline from humidity and room temperature. That shows whether the conditions for mold were present at all, and whether a building defect or ventilation behaviour is the more likely cause.
Does the app work without internet?
Yes, Mold Documentation works 100% offline. All readings and photos stay exclusively on your device. No server, no cloud, no data sharing. The app needs neither an account nor registration.
How much does Mold Documentation cost?
Unlimited rooms and entries, humidity, temperature, dew point, the 5-step mold scale, photos, the ventilation log and the history charts are free to use. No subscription. Use it for good.
Which languages is the app available in?
Mold Documentation is fully translated and usable in 24 languages — all official EU languages. This makes the app suitable for international tenancies where tenant and landlord have different native languages.