Contrax vs RentReducer
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Contrax
Manage all your contracts and subscriptions in one place. Receive timely alerts for upcoming renewals and terminations. Secure your sensitive data with biometric protection and enjoy a beautifully designed, intuitive interface for effortless tracking of expenses and notice periods.
- Centralized contract hub
- Reminder alerts for renewals
- Biometric security (FaceID)
- Export contract data
- Dashboard insights on spending
- Intuitive interface
- Secure iCloud sync
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Contrax - Your Ultimate Contract Management Solution Welcome to Contrax, the all-encompassing hub for managing every facet of your contracts. From gym memberships to mobile plans and health insurance, Contrax streamlines it all. Key Features: Centralized Hub: Your one-stop-shop for all contracts and subscriptions. Reminder Alerts: Stay on top with timely notifications for upcoming terminations. Unrivaled Privacy: Enjoy 100% privacy โ all data is exclusively accessible by you. Biometric Security: Safeguard your contracts with cutting-edge biometric protection using FaceID. Export Functionality: Seamlessly export contracts for backup or in-depth analysis. Dashboard Insights: Visualize upcoming notice periods and track monthly spending effortlessly with our comprehensive dashboard. Intuitive Interface: Enter all your contracts swiftly using our user-friendly interface. It takes just minutes! Beautiful Design: Experience contract management like never before with Contrax's beautifully crafted design โ making it both efficient and aesthetically pleasing. Data Security: Rest assured, your data is 100% yours. We prioritize your security through private and secure iCloud sync โ we have no access to your data. For added peace of mind, utilize Face ID/Touch ID functionality to protect sensitive details from prying eyes. Your Data. Your Privacy. Simplify, Secure, and Elevate Your Contract Management Experience with Contrax. Download Now and Empower Your Control Over Contracts! ------- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ More information on https://quantica-zen.com/apps/contrax/
RentReducer
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Did the Swiss reference rate drop? You may have a right to a lower rent. RentReducer shows you in two minutes whether you have a claim, and mails the right letter straight to your landlord. RentReducer is an independent app and is not affiliated with, operated by, or endorsed by the Swiss Confederation, any canton, public authority, or court. All official data and legal references used in the app are listed individually below under "Sources and Disclaimer". ONE TAP TO SEND. THE APP DOES THE REST You tap Send once. The app generates the reduction request with your signature and has it printed and sent via Priority Mail (A-Post) by our Swiss postal partner. If no answer comes, the app reminds you after 30 and 60 days, and you fire the right follow-up letter from the app: reminder, document request, or conciliation. No printer, no stamps. WHAT THE APP DOES - Check your claim in 2 minutes. Calculation under federal law (Art. 270a CO + VMWG art. 13). Reference rate taken 1:1 from the official table of the Federal Office for Housing (FOH/BWO), inflation 1:1 from the FSO/BFS CPI series, no estimates. (Sources cited below.) - Generate + send automatically. PDF with your finger-signature, Priority Mail (A-Post) included. Registered with tracking optional (+ CHF 7.90). - Push when the letter is handed to Swiss Post. With registered mail, also on the day of delivery, so you know when the response deadline starts. - Auto-reminders after 30 and 60 days. At every reminder, one-tap follow-up: reminder, document-request and conciliation letter all go straight from the app. For the conciliation letter you upload your lease as a photo, the app attaches your prior letters and mails the bundle as registered mail to the conciliation authority. CHF 6.90 per follow-up, plus CHF 7.90 registered for the conciliation letter (or download it as Word and mail it yourself). - Multiple tenants? Each tenant signs with finger in the wizard, all names appear on the letter. - Free rate alert. When the reference rate drops, you get a push, and can file again. PRIVACY Your data stays on your device. No account, no central database. For mailing, your address and PDF go encrypted to our Swiss postal partner, nothing else. PRICE - Free to download. Claim check + rate alert cost nothing. - Letter + Priority Mail (A-Post): CHF 9.90 to 29.90, scaled to your monthly savings (~30%). - Registered with tracking: + CHF 7.90. - Follow-up letter: CHF 6.90 each (reminder and document-request via Pingen). Conciliation letter: CHF 6.90 + CHF 7.90 registered with lease photo and letter history attached, or download as Word and mail it yourself. Get back what you're owed. SOURCES AND DISCLAIMER All official data and legal references used in the app come from the following official Swiss sources: - Mortgage reference interest rate: Federal Office for Housing (FOH/BWO), https://www.bwo.admin.ch/de/entwicklung-referenzzinssatz-und-durchschnittszinssatz - National Consumer Price Index (CPI): Federal Statistical Office (FSO/BFS), https://www.bfs.admin.ch/bfs/en/home/statistics/prices/consumer-price-index.html - Tenancy law, Swiss Code of Obligations (CO art. 269 ff., in particular art. 270a): https://www.fedlex.admin.ch/eli/cc/27/317_321_377/en - Ordinance on the lease and farm lease of residential and commercial premises (OBLF, art. 13): https://www.fedlex.admin.ch/eli/cc/1990/835_835_835/de (German version is the official text) - Conciliation authorities for tenancy matters: FOH directory, https://www.bwo.admin.ch/bwo/de/home/mietrecht/schlichtungsbehoerden.html - Calculation verification reference: Rent calculator of the Zurich courts, https://www.gerichte-zh.ch/themen/miete/mietzinsgestaltung/mietzinsrechner.html RentReducer does not provide legal advice and is not a substitute for an attorney. For legal questions, contact a cantonal tenants' association or a lawyer of your choice.
Screenshots
Verdict
The clearest difference is update cadence: RentReducer at weekly against Contrax's every 5 weeks. RentReducer also leads on iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Contrax sells 2 in-app purchases, starting at $3.99 per year and RentReducer sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Contrax ships an update every 5 weeks, RentReducer weekly. The most recent releases landed on October 8, 2026 and October 10, 2026 respectively.
| Parameter | Contrax | RentReducer |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 57.1% of reviews | โ |
| Update frequency | Every 5 weeks | Weekly โ better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | โ |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 15.0 โ better |
| Further details โ not scored | ||
| Size | 17 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Hendrik Schulke | Manuel Weingartner |
In-app purchases
Contrax
- Yearly subscription14 Days trial$3.991 Year
- Full access$12.99
RentReducer
- Follow-up: documents$7.99
- Follow-up: conciliation$7.99
- Follow-up: reminder$7.99
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- Reduction Letter CHF 9.90$9.99
- Registered mail upgrade$9.99
- Reduction Letter CHF 14.90$17.99
- Reduction Letter CHF 19.90$22.99
- Reduction Letter CHF 24.90$29.99
- Reduction Letter CHF 27.90$29.99
- Reduction Letter CHF 29.90$34.99









