Ultimate Zmanim vs Siddur One
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ultimate Zmanim
This app provides accurate Jewish calendar times, including Shabbat candle lighting, holidays, and daily prayer times, with customizable reminders and offline functionality. It offers a user-friendly interface with timeline navigation and Apple Watch integration for convenient access to important halachic times.
- GPS-based zmanim calculations
- Shabbat candle lighting times
- Holiday and weekly parashah information
- Daf Yomi tracking
- Customizable daily reminders
- Apple Watch companion app
- Offline functionality
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Ultimate Zmanim is the premiere zmanim app for iOS, now with even more features. iOS Features: - GPS-based calculations - Calendrical information, including Shabbat candle lighting times, weekly parashah, chagim, and daf yomi - Daily reminders, scheduled based on zmanim - Beautiful printouts for your shul's bimah or your fridge - Over 100 calculations to customize according to - Companion watch app featuring complications - Today widget in Notification Center - Intuitive timeline navigation - Force touch shortcuts to quickly access alarms, location settings, and more - Split-screen multitasking support on iPad watchOS Features: - Native to watchOS, so it's faster than ever - Expanded complications - Tap a zman for a detailed explanation of the calculation - Force touch menu options, including one to reload your location --- Description: Ultimate Zmanim calculates times using your GPS for maximum accuracy. There's also a rich location picker, so you don't have to be online to set it up. Ultimate Zmanim always works, even when there's no internet. Ultimate Zmanim doesn't stop with the daily zmanim - it also lists chagim, the weekly parashah for both in Israel and out, candle lighting times, and daf yomi. Today's zmanim fade out as they pass, so you can tell what's next at a glance. Ultimate Zmanim also runs on Apple Watch, so you can get notifications, and information about the next upcoming zman right on your watch. With Zmanim Alarms, Ultimate Zmanim can remind you of important zmanim throughout the day. Shema, t'fila, and weekly candle lighting are all covered. Ultimate Zmanim supports printing of the daily Zmanim via AirPrint. You can use this to hang them up in public places, such as your shul, school, or mikveh. You can look up zmanim for any day by tapping on the timeline or the Hebrew date to show a date picker. Tap again to hide it. You can also drag in either direction for convenient access to the previous or the next day. The timeline also supports both the Hebrew and Gregorian calendars. Open the date picker to switch between them. Ultimate Zmanim will remember your selection across app launches. Ultimate Zmanim has been a long time in the making, and I hope you enjoy using it as much as I enjoyed building it! --- What users from the United States, Canada and the United Kingdom are saying: "Best zmanim app out there, gorgeous and intuitive, thanks!!" - tzviki123 "This is my favorite Zmanim app. It's got a beautiful design and the widget is also super helpful. Keep up the great work!" - Bmw1821 "This app nails the difficult challenge of making spiritual software. I love going through my day knowing that my phone will alert me to all the ritually important times." - portal keeper "Great presentation of halachic zmanim with really nice apple watch interface" - Paul Claman "I live in England and I carry it around with me where ever I go. It's got all the info you need including what day of daf hayomi it is.... 5*****" - Rubi roxx ---
Siddur One
This app provides a comprehensive digital siddur with daily prayers, luach zmanim, and customizable holiday calendars. It includes special prayers for various occasions, a prayer compass, and options for font and text size adjustments.
- Daily prayers in Ashkenaz
- Daily luach zmanim
- Prayer compass
- Customizable holiday calendar
- Complete Tanach
- Font and text size options
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The siddur contains all the text you would expect in a regular print siddur. It knows what day it is and delivers the specific tefilos for that day. Also includes a luach zmanim, customizable upcoming holidays calendar, zmanim notifications, complete tanach, shnayim mikra chumash, and pirkei avos. Includes: -All daily prayers in Ashkenaz -Daily luach zmanim -Prayer compass -Special zmanim (candle lighting, fast times, biur chometz etc.) -Musaf for Rosh Chodesh and Chol HaMoed -Kria for Mondays/Thursdays, Fast Days and Holidays -Hoshanos (smart Hoshanos!) -Bentching (including at Bris, Sheva Brochos and holiday inserts) -Vidui Yom Kippur (mincha erev YK and in shonos) -Bedikas Chometz -Chanuka candle lighting -Hatavas Chalom -Tefilas Havineinu -Hafrashas Terumos, Maasoros and Chalah -Havdala -Krias Shma AlHamita -Lekutei Brochos -Font and text size options -Tashlich -Kaparos -Ushpizin and more.
Screenshots
Verdict
The clearest difference is rating: Siddur One at 4.8 against Ultimate Zmanim's 4.3. Siddur One also leads on in-app purchases (none vs 1). Ultimate Zmanim's advantage is update cadence (every 2 weeks vs every 2 months) and ratings volume (131 vs 5). On price, ads 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. Ultimate Zmanim sells 1 one-off in-app purchase. Siddur One asks for nothing beyond the download.
Siddur One holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Ultimate Zmanim has 131 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 78% of Ultimate Zmanim's written reviews are positive against 67% of Siddur One's, so the app with the better star average is not the one people write more warmly about.
Ultimate Zmanim ships an update every 2 weeks, Siddur One every 2 months. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.
| Parameter | Ultimate Zmanim | Siddur One |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (131 ratings) | 4.8 (5 ratings) — better |
| Positive reviews | 77.9% of reviews — better | 66.7% of reviews |
| Number of ratings | 131 — better | 5 |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch — better | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 7 MB | 88 MB |
| Age rating | 4+ | 4+ |
| Developer | Moshe Berman | Mattaniah Beezy |
Customer experience
Ultimate Zmanim
Siddur One
Bugs and requests
Ultimate Zmanim
Reported bugs
28 issues- App keeps alerting with LA time instead of current location
- White screen when opening app on iPad
- App will no longer open on iPad
- Update broke the app
- Winter time displayed after upgrade
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- Error in the app
- First update messed up Zmanim, widget info incorrect, Zmanim same for Jerusalem and Brooklyn
- App shuts right off after new update
- App doesn't open since the update
- App does not open since the last update
- Version 11.7.1 did not completely address the issue with iOS16 update, gets 'stuck'
- 'Reset To Today' function does not bring back to the current date
- One day discrepancy in Zmanim including calendar calculations since iOS16 update
- Omer counting is wrong on some days
- Zmanim alerts giving alerts for a location five hours ahead
- Hebrew titles in the widget not working
- Bug in Chanukah: started a day early, repeated Light 1, repeated Light 3, others a day late, ended a day late
- Watch complication not available for most watch faces
- iOS 14 widgets not found for Infograph and Infograph modular watch faces
- Zmanim are all off on Apple Watch 5, no complications
- Watch os versions keeps on uninstalling itself
- Cannot do anything like print
- Ad's background music
- Location resets to current waypoint when trying to check other cities
- If location services are off, Zmanim are not shown
- Latest version contains a mistake: changing location does not hold, reverts to current location
- Crashes on iPhone 5c with iOS10.3, blank screen
- Cannot check Zmanim for anywhere else, switches back to current location
Requested features
15 requests- Mizrach compass
- Apple Watch face complication to display custom Zmanim
- Customization to carry over to watch app
- Daf Yomi (Yerushalmi) option
- Hebrew date in the widget
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- Alert/alarm for Sunset (Shkiah)
- Pull to refresh option
- Add Jewish holidays
- Dark mode support
- iOS 14 widgets
- Jewish calendar for holidays
- Ability to add and title Jewish dates (birthdays, yahrtzeits)
- Option to choose what to show on iWatch complication
- Support for Infograph watch faces
- Reminders for Maariv/Tzeit Hakochavim
Siddur One
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ultimate Zmanim
- Premium Pack$2.99
Siddur One
No in-app purchases






