U4 vs Keydor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
U4
This loyalty program app allows users to earn points through various activities like scanning cards, inviting friends, or social media engagement. Redeem these points for rewards, exclusive offers, and participate in contests. Stay updated on events and news.
- Earn points through activities
- Redeem points for rewards
- Access exclusive offers
- Participate in contests
- Stay updated on events and news
- Simple login with Facebook or email
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Die U4-App ist dein digitales Treueprogramm! Du kannst ganz einfach durch unterschiedliche Aktivitäten Punkte sammeln und diese gegen tolle Prämien einlösen. Die U4-App bietet dir: – Einfache Anmeldung mit Facebook oder E-Mail – Überblick über deine Treuepunkte und Prämien – Einfacher und schneller Zugang zu Kundenvorteilen – egal ob Prämien, Preise, spezielle Angebote oder Gewinnspiele – Individuelle Angebote und aktuelle Informationen Egal, ob durch das Scannen von Punktekarten, Einladen von Freunden, durch den Besuch oder ein Posting auf Facebook – so schnell und einfach hast du noch nie Treuepunkte gesammelt. Du erhältst immer als Erstes die wichtigsten Infos zu Veranstaltungen und Neuheiten und verpasst keine Angebote mehr! Die U4-App bietet dir noch vieles mehr: – U4 Family – Events – Nachrichten – Reservierung – Event Fotos – News – Kontakt – FAQ Du willst auch Teil im U4-Kundenclub sein? Dann los! Lade dir die U4-App jetzt herunter und das große Punkte sammeln kann beginnen! Die U4-App von hello again ist eine Kundenbindungs-App, die für alle Smartphones verfügbar ist.
Keydor
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Keydor. Your key to new doors. Discover events, meet new people and make plans together — from dinner and sports to weekends away. FIND YOUR NEXT PLAN Explore events on the map or in the list. See the date, place, host and available spots, then request to join. The host confirms your request. INVITE SOMEONE NEW Share an event with a simple web link. Friends can see the main details before installing Keydor. After installing, reopen the invitation to continue in the app. GET STARTED IN A FEW STEPS Create your profile with your name, age and one recognizable photo. Add more details and category photos whenever you like. KEEP YOUR PLANS TOGETHER Save events and keep track of your requests, confirmed plans and the events you host. Connect with people and arrange the details in chat. HOST YOUR OWN EVENT Add a photo, place and time, manage participation requests and invite your connections. Optional notifications keep you informed about requests, decisions and messages. YOU STAY IN CONTROL Browse events without sharing your device location. Optional location access centers the map and shows distances; your device location is not shown to other users. You can report content, block users and delete your account in the app. Keydor is for people aged 18 and over.
Screenshots
Verdict
The clearest difference is update cadence: Keydor at every 2 days against U4's every 3 months. U4's advantage is iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
U4 ships an update every 3 months, Keydor every 2 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.
| Parameter | U4 | Keydor |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| Update frequency | Every 3 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.1 — better | 18.0 |
| Further details — not scored | ||
| Size | 45 MB | 44 MB |
| Age rating | 4+ | 17+ |
| Developer | U4-Center Diskothek Betriebs GmbH | Tim Grobecker |
In-app purchases
U4
No in-app purchases
Keydor
No in-app purchases









