Shabbos Clock vs Kumu.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Shabbos Clock
This app provides a solution for observant Jews who wish to use their smartphone during Shabbat. It offers customizable alarms that adhere to religious guidelines, including automatic shut-off and no snooze function. The app also allows alarms to be set based on local sunrise and sunset times.
- Unlimited alarm options
- Automatic alarm shut-off
- No snooze button
- Repeatable weekly alarms
- Alarms based on sunrise/sunset offsets
- Full iOS11 and iPhone X support
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Can't part with your iPhone on the holiest day of the week? We've got the solution! Shabbos Clock is the app for every Jew who celebrates the Shabbat. Features: * Displays current time on screen. * Unlimited Alarm Options * Alarms automatically shut off after specified duration (10-50 seconds) * No snooze button to interfere with Shabbos rules. * Repeatable Alarms by Weekly Pattern * Set Alarms Based Off Of Offsets Of Your Local Sunrise & Sunset * Full iOS11 and iPhone X Support Important: For the alarm to be triggered, you must leave this application open. Closing the program or the iPhone will prevent the alarm from waking you up. Please also make sure your ringer volume is loud enough to wake you up. Make sure to plug in your device to prevent battery drain from not waking you up. Test BEFORE Shabbos to confirm your setup works. Note: If you are using an iPod Touch first generation, make sure to plug in external speakers to hear the alarm. לא יכולים להיפרד מהסמארטפון בשבת? לנו יש את הפיתרון! שעון שבת הוא אפליקציה לכל יהודי שומר שבת תכונות: *מייצג שעה נוכחית על המסך *אפשרויות שעון מעורר ללא הגבלה *שעון מעורר נכבה אוטומטית לאחר זמן מוגדר (10-50 שניות) *ללא כפתור "נודניק" המהווה חילול שבת *צילצול שחוזר על עצמו באופן שבועי *כוונו את השעון לזריחה ושקיעה של איזורכם *תמיכה מלאה ל-iOS11 ול- iphoneX חשוב: בכדי להפעיל את השעון, חובה להשאיר את האפליקציה הזו פתוחה. סגירת האפליקציה או את הסמארטפון ימנע מהתוכנה לעבוד. אנא ודאו כי עוצמת הקול של הנייד גבוהה מספיק להעיר אתכם. במידת הצורך, חברו את שקע החשמל שלא ייגמר הסוללה. בדקו לפני השבת לוודא שההגדרות תקינות. הערה: אם הינך משתמש ב-ipod Touch דור ראשון, ודא לחבר אליו רמקולים חיצוניים לשמוע את הצלצול.
Kumu.
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Available in English, Hebrew, Russian and Arabic. Follow your iPhone language or choose an app language. Start your morning with a small task. Kumu. combines an iPhone alarm with simple wake-up tasks. Choose math problems, type your own sentence or try the on-device toilet photo task. Pick one task or combine several for your morning routine. • Set one-time or repeating alarms. • Choose your alarm sound. • Personalize your sentence and number of math problems. • Practice tasks before your alarm rings. • Track completed mornings in a simple weekly view stored only on your device. • Use the app in English, Hebrew, Russian or Arabic. • Keep your alarms and task data on your device, without accounts, ads or tracking. Requires iPhone with iOS 26 or later and alarm permission. The optional photo task requires camera permission; a math fallback is available. Photo recognition is experimental and may not recognize every image. Kumu. uses the iOS alarm system. System controls can stop an individual alert. Backup alerts are scheduled at one-minute intervals for up to 30 minutes ahead and renewed while tasks are active. Completing the wake-up flow cancels remaining backup alerts. Support: support@kumu.fun
Screenshots
Verdict
The clearest difference is update cadence: Kumu. at weekly against Shabbos Clock's every 4 months. Shabbos Clock's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.0). On price, ads and in-app purchases 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
Shabbos Clock costs $0.99 and Kumu. $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Shabbos Clock ships an update every 4 months, Kumu. weekly. The most recent releases landed on October 21, 2026 and October 13, 2026 respectively.
| Parameter | Shabbos Clock | Kumu. |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 2.4 (21 ratings) — better | — |
| Positive reviews | 30.9% of reviews | — |
| Number of ratings | 21 — better | — |
| Update frequency | Every 4 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 89 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | RustyBrick, Inc. | Alon Malev |
In-app purchases
Shabbos Clock
No in-app purchases
Kumu.
No in-app purchases
