German Left Party App Triggers Over 11,000 Rent Violation Reports to Authorities — Startups and venture capital

Two years after launching a rent-checking application, the German Left Party reports that over 11,000 tenants have used the tool to alert authorities about suspected excessive rents. While the app was utilized more than 333,000 times across 40 cities, many users hesitated to file official complaints due to fears of eviction.

The Left Party faction in the German Bundestag has released an interim assessment of its "Rent Gouging App," which was launched in November 2024. Over the past two years, more than 11,000 households have used the platform to report suspected excessive rents to local authorities. The application, initially available in 39 cities, has recently expanded to include Bremen. In total, the program has been accessed over 333,000 times during this period.

According to the faction's analysis, nearly two-thirds of the rents checked were classified as excessive, totaling 215,941 cases. However, a significant number of tenants did not proceed to file formal reports with authorities. The Left Party attributes this hesitation to fears among renters that reporting violations could lead to losing their housing. Of the 11,157 suspicion reports that were successfully forwarded to officials, the average rent overage was found to be 66 percent. Based on these figures, the party calculates that rents for these households should be reduced by an average of more than 250 euros per month.

Berlin recorded the highest usage of the application, with tenants entering data 123,698 times and triggering authority interventions 5,083 times. In the Friedrichshain-Kreuzberg district alone, fines totaling 81,600 euros were imposed, though only 27,500 euros have been paid to date. Frankfurt am Main is cited as a model for strict enforcement; its housing office has conducted over 1,000 procedures since 2020, securing repayments of 330,330 euros. A recent case involved a shared apartment receiving a rent refund of approximately 26,700 euros.

Under German economic criminal law, charging rents more than 20 percent above local comparative values while exploiting market scarcity can constitute an administrative offense. If rents exceed the standard by more than 50 percent, it may be considered a criminal offense under certain conditions. The Left Party believes its app has spurred broader action, with several cities introducing their own rent calculators. Member of Parliament Caren Lay criticized the findings, noting that millions of euros in illegally high rents have flowed to landlords. She emphasized that the federal government must make it easier for municipalities to combat rent gouging.

Sources: Handelsblatt.