# Contacts Address Book vs OPSM

The clearest difference is in-app purchases: OPSM at none against Contacts Address Book's 4. OPSM also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.0). Contacts Address Book's advantage is update cadence (every 4 weeks vs every 2 months). On price and ads there is nothing between them.

Both are free to download. Contacts Address Book sells 3 in-app purchases, starting at $3.99 per month. OPSM asks for nothing beyond the download.

Contacts Address Book ships an update every 4 weeks, OPSM every 2 months. The most recent releases landed on October 17, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Contacts Address Book | OPSM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (52 ratings)](https://appshunter.io/ios/app/contacts-address-book-amicu/id1481868897/reviews)** | — |
| Number of ratings | **52** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Freemium | — |
| Size | 29 MB | 72 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kai Oelfke](https://appshunter.io/developer/644779478) | [MIMOS Berhad](https://appshunter.io/developer/875191495) |

## What reviewers say

### Contacts Address Book

[App page](https://appshunter.io/ios/app/contacts-address-book-amicu/id1481868897)

This app helps you nurture your personal relationships by reminding you to stay in touch and celebrate important birthdays. It offers a private and offline experience, allowing you to manage contacts and set custom reminders to keep your social circle strong.

**Highlights:** Birthday reminders, Keep-in-touch reminders, Contact management, Offline functionality, Customizable notifications, Widgets

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.99 | per month |
| Premium | $29.99 | per year |
| Premium | $29.99 | per year |


### OPSM

[App page](https://appshunter.io/ios/app/opsm/id1620847697)

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

**In-app purchases:** none


## Frequently asked questions

### Is Contacts Address Book free?

Contacts Address Book is free to download, with in-app purchases available.

### Is OPSM free?

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

### Do Contacts Address Book or OPSM have ads?

Neither Contacts Address Book nor OPSM shows ads.

### Which is updated more often, Contacts Address Book or OPSM?

Contacts Address Book ships an update every 4 weeks, and OPSM every 2 months. Most recently, Contacts Address Book was updated on October 17, 2026 and OPSM on October 5, 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.*