Wasser vs Birthify Calendar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Wasser
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Wasser-Challenge helps you drink enough every day – on your own or together with friends, family, your club or colleagues. Please note: the app is currently available in German only. HOW IT WORKS • Log every glass with one tap: +100, +250, +500 ml or a custom amount • The progress ring shows how far you are today • A drink reminder at the time you choose • View, edit or delete your entries STAY ON TRACK TOGETHER • Rooms for your team, family, club or office – join with a room code • Shared daily goal, leaderboard, streaks and an overview of recent weeks • Cheer each other on with push notifications • New group challenges every week LEVELS AND ACHIEVEMENTS • Earn XP and level up • Daily challenges with bonus XP • 18 achievements to unlock TEAM CHALLENGE OF THE MONTH Every month, teams of at least 4 people compete. What counts are the days on which you reach your daily goal – not the amount. The best team wins a prize, in November €10 by SEPA bank transfer. Taking part is free and voluntary. Official rules (German, binding): https://water.rk-studios.de/gewinnspiel – Apple is not a sponsor and is not involved in any way. YOUR DATA • No account and no e-mail address needed (an e-mail only if you join the team challenge) • Servers in Germany • Manage consents, export or delete your data – right in the app PREMIUM (OPTIONAL) The free version contains ads. Premium removes ads and adds advanced statistics (6-week trend, goal rate, weekday analysis) and extra challenges. Wasser-Challenge Premium is a monthly auto-renewable subscription. The price is shown in the app before you buy. Payment is charged to your Apple ID. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period, and you can cancel it at any time in your Apple ID settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy (German): https://water.rk-studios.de/datenschutz Subscription terms (German): https://water.rk-studios.de/abo-bedingungen Note: the app is not a substitute for medical advice. Don't drink beyond your thirst; if you have a medical condition, check your fluid needs with your doctor. Wasser-Challenge is an app by RK Studios UG (haftungsbeschränkt), Halver, Germany.
Birthify Calendar
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Birthify Calendar hilft dir, Geburtstage organisiert im Blick zu behalten. Speichere Geburtstage mit Notizen und Kategorien, organisiere Kontakte in Gruppen und lass dich rechtzeitig erinnern. Für Glückwünsche kannst du wiederverwendbare Vorlagen mit Variablen nutzen, damit Nachrichten schneller vorbereitet sind und trotzdem persönlich bleiben. Funktionen: - Geburtstage übersichtlich verwalten - Erinnerungen für kommende Geburtstage - Gruppen für Familie, Freunde, Teams oder Gemeinden - Kategorien und Notizen pro Kontakt - Wiederverwendbare Nachrichtenvorlagen - Import und Export deiner Daten - Datenschutz- und Löschfunktionen in der App Birthify Calendar ist für alle gedacht, die wichtige Menschen nicht vergessen und Geburtstagsgrüße entspannter vorbereiten möchten.
Screenshots
Verdict
The clearest difference is in-app purchases: Birthify Calendar at none against Wasser's 1. Birthify Calendar also leads on ads (none vs shown) and update cadence (fortnightly vs every 7 months). On price, device support and iOS requirement 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. Wasser sells 1 in-app purchase, starting at $3.99 per month. Birthify Calendar asks for nothing beyond the download.
Wasser ships an update every 7 months, Birthify Calendar fortnightly. The most recent releases landed on November 5, 2026 and October 10, 2026 respectively.
| Parameter | Wasser | Birthify Calendar |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 7 months | Fortnightly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 40 MB | 37 MB |
| Age rating | 12+ | 4+ |
| Developer | Robin Kaulfuss | Marten Messiha |
In-app purchases
Wasser
- Premium$3.991 Month
Birthify Calendar
No in-app purchases









