Fossy Protokoll helps tenants in Germany keep a verifiable record of defects in their flat: noise disturbance, mould, heating failures and more. From the recorded occurrences it builds a protocol covering a chosen period, and a factual defect notification addressed to the landlord. Both can be saved and shared as PDF or Markdown. <b>Note: the app is in German</b> The interface and all generated documents are written in German, because they follow German residential tenancy practice. <b>Not legal advice</b> The app documents, it does not advise. The generated texts cite no statutes, claim no rent reduction and set no deadline of their own. A response date only appears when you enter one yourself. <b>Everything stays on the device</b> Data lives in a local database, photos in the app's private directory. The app requests no permission that touches your data or the device, never accesses the network, and contains no tracking or analytics. When you export something, you choose the destination yourself. Android's automatic backup is switched off as well, so your defects and photos never reach a cloud account. Instead you can create a full backup as a ZIP file at any time and restore it later, for instance when moving to a new phone. Without such a backup the data is lost if the device is. <b>Features</b> * Manage tenant profile, rental units and landlords * Record defects by category: noise, mould, heating, hot water, damp, sanitary, electrics, windows and doors, pests, other * Document individual occurrences with period, category, affected room, severity, impact, witnesses and notes * Attach photos to defects and to individual occurrences, with captions * Assemble protocols over a period and refresh them later * Generate a defect notification for the landlord * Export as PDF with embedded photos, or as Markdown * Full backup and restore as a ZIP file <b>Free and open source</b> The source code is available under GPL-3.0-or-later. The app uses no proprietary