Comparison

Ultimate Zmanim vs Siddur AI

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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 ---

About

Siddur AI

This app serves as a daily prayer companion for Jewish individuals. It provides an easy-to-use siddur to follow daily services. Optional premium features offer AI chat guidance and prayer explanations.

Highlights
  • Daily prayer services
  • Easy-to-use siddur
  • AI chat guidance
  • Prayer explanations
  • Narration features
Features
Read full description

Siddur AI is a Jewish daily prayer companion. Follow daily services in an easy-to-use siddur. Optional Siddur AI Premium subscriptions unlock paid AI chat guidance, prayer explanations, narration, and other premium prayer tools. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://gist.github.com/neojeffersonian/0b5a496780a0bfb93aca08c140c6eea3

Screenshots

Ultimate Zmanim4 screens
Siddur AI1 screens

Verdict

The call

The clearest difference is rating: Siddur AI at 5.0 against Ultimate Zmanim's 4.3. Siddur AI also leads on in-app purchases (none vs 1) and update cadence (every 3 days vs every 2 weeks). Ultimate Zmanim's advantage is ratings volume (131 vs 2) and device support (5 vs 2). On price, ads and monetization model 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. Ultimate Zmanim sells 1 one-off in-app purchase. Siddur AI asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Siddur AI holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Ultimate Zmanim has 131 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 78% of Ultimate Zmanim's written reviews are positive against 100% of Siddur AI's.

UpkeepUpdate frequency

Ultimate Zmanim ships an update every 2 weeks, Siddur AI every 3 days. The most recent releases landed on October 21, 2026 and October 17, 2026 respectively.

Scorecard7 real differences · 3 level
Ultimate Zmanim versus Siddur AI: the parameters behind the verdict, then further details
ParameterUltimate ZmanimSiddur AI
PriceFreeFree
Rating4.3 (131 ratings)5.0 (2 ratings) — better
Positive reviews77.9% of reviews100.0% of reviews — better
Number of ratings131 — better2
Update frequencyEvery 2 weeksEvery 3 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod, Mac, Apple Watch — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size7 MB30 MB
Age rating4+4+
DeveloperMoshe BermanDavid Miller

Customer experience

Ultimate Zmanim

All ratings131 ratings
Positive81.7%
Neutral9.2%
Negative9.2%
Written reviews86 reviews
Positive77.9%
Neutral12.8%
Negative9.3%

Siddur AI

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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
Show 23 more
  • 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
Show 10 more
  • 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 AI

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Ultimate Zmanim

One-time1
  • Premium Pack$2.99
None

Siddur AI

No in-app purchases

Questions

Is Ultimate Zmanim free?
Ultimate Zmanim is free to download, with in-app purchases available.
Is Siddur AI free?
Siddur AI is free to download, with no in-app purchases.
Which has better reviews, Ultimate Zmanim or Siddur AI?
Siddur AI is rated higher. Ultimate Zmanim averages 4.3 out of 5 from 131 ratings, while Siddur AI averages 5.0 from 2 ratings.
Do Ultimate Zmanim or Siddur AI have ads?
Neither Ultimate Zmanim nor Siddur AI shows ads.
Which is updated more often, Ultimate Zmanim or Siddur AI?
Ultimate Zmanim ships an update every 2 weeks, and Siddur AI every 3 days. Most recently, Ultimate Zmanim was updated on October 21, 2026 and Siddur AI on October 17, 2026.

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