# KleinMobile vs CircleBack

The clearest difference is review sentiment: CircleBack at 61% against KleinMobile's 0%. CircleBack also leads on rating (4.5 vs 1.7) and ratings volume (2.5K vs 3). KleinMobile's advantage is device support (3 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CircleBack holds the better App Store score, 4.5 against 1.7. That said, the two scores are not equally well evidenced: CircleBack has 2.5K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 0% of KleinMobile's written reviews are positive against 61% of CircleBack's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 10, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | KleinMobile | CircleBack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.7 (3 ratings)](https://appshunter.io/ios/app/kleinmobile/id511339650/reviews) | **[4.5 (2.5K ratings)](https://appshunter.io/ios/app/circleback-updated-contacts/id957826826/reviews)** |
| Number of ratings | 3 | **2.5K** |
| Positive reviews | 0.0% of reviews | **60.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | Free |
| Size | 64 MB | 118 MB |
| Requires iOS | **16** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [Tidalis Americas Ltd](https://appshunter.io/developer/511339656) | [CircleBack, Inc.](https://appshunter.io/developer/303908341) |

## What reviewers say

### KleinMobile

[App page](https://appshunter.io/ios/app/kleinmobile/id511339650)

This app allows marine pilots and shipping agencies to manage assigned jobs, receive private messages from port authorities, and access public port information. It includes an alarm function for upcoming tasks and web-based information access.

**Highlights:** Manage pilot jobs, Receive private port messages, Task alarm function, Access public port information, Web information access

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

**In-app purchases:** none


### CircleBack

[App page](https://appshunter.io/ios/app/circleback-updated-contacts/id957826826)

This app intelligently updates your contacts, finds new ones from email, and cleans duplicates. It also allows scanning business cards and offers unified contact management across devices.

**Highlights:** Automatic contact updates, Duplicate contact merging, New contact discovery from emails, Business card scanning, Unified address book, Contact sync across devices

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 📚 Helpful for managing contacts
- 💾 Keeps contacts synced
- 🔍 Useful for finding updated contact info
- 🧹 Helps clean up duplicate contacts

**What reviewers complain about**

- 🐛 Crashes or freezes
- 🔁 Duplicates keep reappearing
- 🔒 Google login issues
- 🤯 Messes up or deletes contacts
- 🕰️ Slow performance

**Reported bugs**

- Fails to update contacts on devices
- Incorrectly merges unrelated contacts
- Loses contact notes and other data
- Unreliable sync between app and phone contacts

**Requested features**

- Add ability to remove contacts from groups
- Improve search functionality
- Allow starting with a fresh contact list
- Provide better backup/restore options


## Frequently asked questions

### Is KleinMobile free?

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

### Is CircleBack free?

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

### Which has better reviews, KleinMobile or CircleBack?

CircleBack is rated higher. KleinMobile averages 1.7 out of 5 from 3 ratings, while CircleBack averages 4.5 from 2.5K ratings.

### Do KleinMobile or CircleBack have ads?

Neither KleinMobile nor CircleBack shows ads.

### Which is updated more often, KleinMobile or CircleBack?

KleinMobile ships an update every 2 months, and CircleBack every 2 months. Most recently, KleinMobile was updated on October 10, 2026 and CircleBack on October 17, 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.*