# Ultimate Zmanim vs Siddur One

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 ratings volume (131 vs 6) and review sentiment (78% vs 67%). On price, update cadence, ads and iOS requirement there is nothing between them.

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 6, 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 monthly. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Ultimate Zmanim | Siddur One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (131 ratings)](https://appshunter.io/ios/app/ultimate-zmanim/id452921604/reviews) | **[4.8 (6 ratings)](https://appshunter.io/ios/app/siddur-one-tefillah-and-zmanim/id1606691499/reviews)** |
| Number of ratings | **131** | 6 |
| Positive reviews | **77.9% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 7 MB | 89 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Moshe Berman](https://appshunter.io/developer/362306433) | [Mattaniah Beezy](https://appshunter.io/developer/1606691501) |

## What reviewers say

### Ultimate Zmanim

[App page](https://appshunter.io/ios/app/ultimate-zmanim/id452921604)

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:** Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Pack | $2.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🌟 Accurate Zmanim calculations
- 🌍 Global Zmanim data
- ✨ Clean and intuitive interface
- 🎨 Customizable options

**What reviewers complain about**

- 🐛 App crashes/doesn't open
- 🐛 Location issues
- 🐛 Watch app/complications not working
- 🐛 Incorrect Zmanim times
- 🐛 Updates breaking the app

**Reported bugs**

- 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

**Requested features**

- 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


### Siddur One

[App page](https://appshunter.io/ios/app/siddur-one-tefillah-and-zmanim/id1606691499)

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.

**Highlights:** Daily prayers in Ashkenaz, Daily luach zmanim, Prayer compass, Customizable holiday calendar, Complete Tanach, Font and text size options

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Ultimate Zmanim free?

Ultimate Zmanim is free to download, with in-app purchases available.

### Is Siddur One free?

Siddur One is free to download, with no in-app purchases.

### Which has better reviews, Ultimate Zmanim or Siddur One?

Siddur One is rated higher. Ultimate Zmanim averages 4.3 out of 5 from 131 ratings, while Siddur One averages 4.8 from 6 ratings.

### Do Ultimate Zmanim or Siddur One have ads?

Neither Ultimate Zmanim nor Siddur One shows ads.

### Which is updated more often, Ultimate Zmanim or Siddur One?

Ultimate Zmanim ships an update every 2 weeks, and Siddur One monthly. Most recently, Ultimate Zmanim was updated on October 21, 2026 and Siddur One on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*