# DESY Phone Book vs OperrTel

The clearest difference is in-app purchases: DESY Phone Book at none against OperrTel's 3. DESY Phone Book also leads on iOS requirement (9.0 vs 13.0). OperrTel's advantage is update cadence (weekly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. OperrTel sells 3 in-app purchases, starting at $0.49 per month. DESY Phone Book asks for nothing beyond the download.

DESY Phone Book ships an update every 2 months, OperrTel weekly. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | DESY Phone Book | OperrTel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (7 ratings)](https://appshunter.io/ios/app/operrtel/id1502437139/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | — | Subscription |
| Size | 19 MB | 135 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Deutsches Elektronen-Synchrotron DESY](https://appshunter.io/developer/712258230) | [Operr Technologies, Inc.](https://appshunter.io/developer/1197568140) |

## What reviewers say

### DESY Phone Book

[App page](https://appshunter.io/ios/app/desy-phone-book/id1017732354)

**Features:** macOS Compatibility

**In-app purchases:** none


### OperrTel

[App page](https://appshunter.io/ios/app/operrtel/id1502437139)

This business phone service app provides full mobility for its customers. Manage voice calls, instant messaging, and presence services from your mobile device, effectively carrying your office in your pocket.

**Highlights:** Mobile business phone service, Voice calls, Instant messaging, Presence services, Office mobility

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Fee | $0.49 | per month |
| Half Yearly Fee | $0.99 | per 6 months |
| Yearly Fee | $2.49 | per year |


## Frequently asked questions

### Is DESY Phone Book free?

DESY Phone Book is free to download, with no in-app purchases.

### Is OperrTel free?

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

### Do DESY Phone Book or OperrTel have ads?

Neither DESY Phone Book nor OperrTel shows ads.

### Which is updated more often, DESY Phone Book or OperrTel?

DESY Phone Book ships an update every 2 months, and OperrTel weekly. Most recently, DESY Phone Book was updated on November 11, 2026 and OperrTel on November 3, 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.*