Comparison

U4 vs Keydor

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Keydor

Features
Read full description

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

U44 screens
Keydor4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 6 level
U4 versus Keydor: the parameters behind the verdict, then further details
ParameterU4Keydor
PriceFreeFree
Positive reviews50.0% of reviews—
Update frequencyEvery 3 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.1 — better18.0
Further details — not scored
Size45 MB44 MB
Age rating4+17+
DeveloperU4-Center Diskothek Betriebs GmbHTim Grobecker

In-app purchases

None

U4

No in-app purchases

None

Keydor

No in-app purchases

Questions

Is U4 free?
U4 is free to download, with no in-app purchases.
Is Keydor free?
Keydor is free to download, with no in-app purchases.
Do U4 or Keydor have ads?
Neither U4 nor Keydor shows ads.
Which is updated more often, U4 or Keydor?
U4 ships an update every 3 months, and Keydor every 2 days. Most recently, U4 was updated on November 3, 2026 and Keydor on November 5, 2026.

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