# Circles of Trust

> Enterprise file protection and secure sharing for trusted groups. (iPhone/iPad app by Cryptomill Technologies Ltd..)

- Source: https://appshunter.io/ios/app/circles-of-trust/id979662162 (this page in markdown: same URL + `.md`)
- Developer: [Cryptomill Technologies Ltd.](https://appshunter.io/developer/898491615)
- Category: Productivity
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 16.6 · 88 MB
- Languages: American English, French (France)
- Released: 2015-08-31
- Data updated: 2026-06-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/circles-of-trust/id979662162/reviews.md

## What is Circles of Trust?

Circles of Trust™ is an enterprise application that provide file based protection. It enables the protection of high value data regardless of whether it is at rest or in motion. It is an easy to use security solution that allows end users to create a “trusted group” of people for simple and secure sharing. Encryption follows the data wherever it goes whether on an email, USB or sitting on someone’s desktop - only people in the Circle can access the file.
 
Circles of Trust™ is available as a managed enterprise version. It supports mobile devices and are compatible with all major cloud devices. Threat models that Circles of Trust™ addresses include: external hackers, lost or stolen devices, and accidental data exposure.

When sending an encrypted file from your mobile device, the user accepting the file will receive a COT file. COT stands for “Circles of Trust” and is the format used by Circles of Trust™ to denote that a file has been encrypted for a particular Circle.

When you have the Circles of Trust™ app installed on your mobile device, .cot files belonging to a Circle of which you are a member will appear with a Circles of Trust™ icon indicating that the file you are looking at is indeed encrypted. However, on your computer, .cot files belonging to a Circle of which you are a member will not appear as a .cot file, instead the file will have a Circles of Trust™ badge on the bottom corner to indicate that the file you are looking at is indeed encrypted.

## Key features

- End-to-end file encryption
- Trusted group creation
- Secure data sharing
- Cross-device compatibility
- Cloud storage integration
- Protection against data exposure


## Frequently asked questions about Circles of Trust

### What is Circles of Trust used for?

Circles of Trust is an enterprise application designed for file-based protection. It enables the secure sharing of high-value data, ensuring only members of a 'trusted group' can access encrypted files, whether they are at rest or in motion.

### How does Circles of Trust protect files?

It uses end-to-end encryption that follows the data wherever it goes, including emails, USB drives, or desktop storage. Only individuals within a designated 'Circle' can decrypt and access the protected files.

### What devices are compatible with Circles of Trust?

Circles of Trust is compatible with major cloud devices and supports mobile devices, specifically iPhones and iPads. This ensures data protection and sharing capabilities across various platforms.

### What kind of security threats does Circles of Trust address?

The application addresses threat models including external hackers, lost or stolen devices, and accidental data exposure. It provides a robust security solution for sensitive information.

### How are encrypted files identified in Circles of Trust?

When a file is encrypted for a Circle, it uses the .cot file format. On mobile devices, .cot files belonging to a Circle you are part of will display a Circles of Trust icon. On computers, these files will have a Circles of Trust badge in the corner.

### Is Circles of Trust available for personal use?

Circles of Trust is described as an enterprise application, suggesting its primary focus is on business and organizational use for managing and securing sensitive data.

### How often is Circles of Trust updated?

The app was last updated on November 24, 2024, with version 4.6.1. This indicates a commitment to regular updates and maintenance for the application.

### Does Circles of Trust have ads?

No, Circles of Trust does not contain advertisements. The application is free and does not display any ads to users.

## Version history (last 5 releases)

### 4.6.1 — 2024-11-24

added support on iOS18
added dark/tinted icon
redesigned logo
improved performance and fixed bugs

### 4.5.0 — 2023-10-27

Added support on iOS17
Fixed minor display issues

### 4.4.5 — 2022-07-22

fix bugs and improve user experience on small screen devices

### 4.4.4 — 2022-06-11

bug fix and improved the stability

### 4.4.3 — 2022-05-28

fixed bugs and improved perfomance

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## More apps by Cryptomill Technologies Ltd.

- [CODA](https://appshunter.io/ios/app/coda/id1555132785)

All apps by Cryptomill Technologies Ltd.: https://appshunter.io/developer/898491615

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*