Sag's Wien vs U4
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sag's Wien
Report city issues directly to the Vienna government via your smartphone. Quickly submit concerns, hazards, or disruptions without an account. Track issue status and receive updates through push notifications.
- Report issues and concerns
- No account creation required
- List, map, and detail views
- Support and follow other issues
- Personalized profiles for multi-device use
- Push notification status updates
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Report an issue, concern, public hazard or a disruption whenever you want and where ever you are via Smartphone to the Vienna city government: Introducing the new app "Vienna Calling". With Vienna Calling we made the city more portable, personal and better connected - with this dialog between citizen and city government we will improve Vienna together. The features Just a few clicks and you can send your issues to the city government - fast, intuitive and without the need to create an account. Issues will be displayed in list-, map- or detail views. Users can support other issues or "follow" them. With a personal profile you can even use Vienna Calling on different devices. The city government will work to resolve your issues as fast as possible and will update you continuously via push notifications about the current status.
U4
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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.
Screenshots
Verdict
The clearest difference is ads: Sag's Wien at none against U4's shown. U4's advantage is iOS requirement (13.4 vs 16.4). On price, update cadence, 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.
Sag's Wien ships an update monthly, U4 every 6 weeks. The most recent releases landed on September 18, 2026 and May 16, 2026 respectively.
| Parameter | Sag's Wien | U4 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Monthly — better | Every 6 weeks |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.4 | 13.4 — better |
| Further details — not scored | ||
| Size | 25 MB | 38 MB |
| Age rating | 4+ | 17+ |
| Developer | Stadt Wien | U4-Center Diskothek Betriebs GmbH |
In-app purchases
Sag's Wien
No in-app purchases
U4
No in-app purchases
