# OU Kosher vs Siddur

The clearest difference is price: OU Kosher at Free against Siddur's $5.99. OU Kosher also leads on rating (4.1 vs 3.6) and review sentiment (68% vs 54%). Siddur's advantage is ads (none vs shown) and chart position (#49 vs unranked). On ratings volume, in-app purchases and device support there is nothing between them.

OU Kosher is free to download; Siddur costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OU Kosher holds the better App Store score, 4.1 against 3.6. Both are backed by a comparable volume of ratings — 15 and 36 respectively. Written reviews point the same way: 68% of OU Kosher's written reviews are positive against 54% of Siddur's.

OU Kosher ships an update every 5 weeks, Siddur every 3 months. The most recent releases landed on June 4, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | OU Kosher | Siddur |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | **[4.1 (15 ratings)](https://appshunter.io/ios/app/ou-kosher/id491138771/reviews)** | [3.6 (36 ratings)](https://appshunter.io/ios/app/siddur-linear-edition/id1141735259/reviews) |
| Number of ratings | 15 | **36** |
| Positive reviews | **68.4% of reviews** | 53.6% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | Ad-supported | **Free** |
| Best chart rank | — | **#49** |
| Size | 32 MB | 22 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Orthodox Union](https://appshunter.io/developer/428817065) | [Chabad.org Jewish Apps](https://appshunter.io/developer/1127567978) |

## What reviewers say

### OU Kosher

[App page](https://appshunter.io/ios/app/ou-kosher/id491138771)

Easily search for OU Kosher certified products, including those for Passover. Get alerts on new certifications and access a hotline for kosher questions. This app provides direct access to Orthodox Union product information and resources.

**Highlights:** Product certification search, Kosher for Passover products, Product alerts, Newly certified products, Kosher question hotline, Direct access to Orthodox Union information

**Features:** macOS Compatibility

**In-app purchases:** none


### Siddur

[App page](https://appshunter.io/ios/app/siddur-linear-edition/id1141735259)

**Currently charting:** #49 Top Paid · Lifestyle (US App Store)

This smart prayer book offers the acclaimed Kehot Linear Siddur with easy navigation for all prayers and blessings. It includes a Zmanim calculator for accurate halachic times based on your location, a tefillin mirror, and a Mizrach compass.

**Highlights:** Smart prayers, All prayers and blessings, Halachic times calculator, Hyperlinked table of contents, Tefillin mirror, Mizrach Compass

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OU Kosher free?

OU Kosher is free to download, with no in-app purchases.

### Is Siddur free?

Siddur costs $5.99, with no in-app purchases.

### Which has better reviews, OU Kosher or Siddur?

OU Kosher is rated higher. OU Kosher averages 4.1 out of 5 from 15 ratings, while Siddur averages 3.6 from 36 ratings.

### Do OU Kosher or Siddur have ads?

OU Kosher shows ads; Siddur does not.

### Which is updated more often, OU Kosher or Siddur?

OU Kosher ships an update every 5 weeks, and Siddur every 3 months. Most recently, OU Kosher was updated on June 4, 2026 and Siddur on September 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.*