# Copiosus — Another lame chat application

> Another lame chat application (iPhone/iPad app by Verbosus.com.)

- Source: https://appshunter.io/ios/app/copiosus/id1475444882 (this page in markdown: same URL + `.md`)
- Developer: [Verbosus.com](https://appshunter.io/developer/560869166)
- Category: Social Networking, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.6 · 4 MB
- Languages: American English
- Released: 2019-08-16
- Data updated: 2026-08-27
- User reviews in markdown: https://appshunter.io/ios/app/copiosus/id1475444882/reviews.md

## What is Copiosus?

Copiosus is just another P2P chat application.

This software is provided "as is" without warranties or conditions of any kind, either expressed or implied.

Please download this app only if:
- You care about security.
- You don't care about a beautiful UI.
- You like to try apps other than WhatsApp and Signal.

Features:
- Send messages.
- Send files and images.
- Block users.
- Two factor authentication (MFA)
- End-to-end encryption using an asymmetric key.
- Improved end-to-end security using a security key as a second factor which encrypts data using a shared symmetric key.
- Minimal privileges required.
- No in app purchases.
- No ads.

How does end-to-end encryption work in this app:
1. Whenever you send a message M a random symmetric key R is generated
2. R is encrypted using the asymmetric (public) key of the other user resulting in A
3. M is encrypted with R resulting in N
4. If security key S is set: N is encrypted by S
5. N and A is sent to the destination


## Version history (last 5 releases)

### 1.4.5 — 2025-11-19

* Fix copy command by long press
* Login and register UI update

### 1.4.4 — 2024-08-08

* Bugfix: Rare crash when using MFA

### 1.4.3 — 2022-08-15

* Bugfix: Crop issue when sending photos in portrait mode

### 1.4.2 — 2022-06-12

* Minor UI fixes for two factor authentication

### 1.4.1 — 2022-04-13

* Two factor authentication
* Show user information in settings

## Apps similar to Copiosus

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Ocean Multi](https://appshunter.io/ios/app/ocean-multi/id6468956637) | — | Free | Social Networking |
| [KeeperChat Encrypted Messenger](https://appshunter.io/ios/app/keeperchat-encrypted-messenger/id1216446440) | 4.2 (389) | Free | Social Networking |
| [Duo Messenger](https://appshunter.io/ios/app/duo-messenger/id6503286911) | 2.3 (3) | Free | Social Networking |
| [EGSP](https://appshunter.io/ios/app/egsp/id6474728670) | — | Free | Social Networking |
| [LockChat](https://appshunter.io/ios/app/lockchat/id1618960720) | 5.0 (1) | Free | Social Networking |
| [Notabit](https://appshunter.io/ios/app/notabit/id6448895415) | — | Free | Social Networking |

## More apps by Verbosus.com

- [VerbTeX LaTeX Editor](https://appshunter.io/ios/app/verbtex-latex-editor/id560869163)
- [VerbTeX Pro LaTeX Editor](https://appshunter.io/ios/app/verbtex-pro-latex-editor/id560872078)
- [Anoc Pro Octave Editor](https://appshunter.io/ios/app/anoc-pro-octave-editor/id597864931)
- [Anoc Octave Editor](https://appshunter.io/ios/app/anoc-octave-editor/id1453896073)
- [Rlytic R Programming Editor](https://appshunter.io/ios/app/rlytic-r-programming-editor/id6739818770)

All apps by Verbosus.com: https://appshunter.io/developer/560869166

## Related topics

[verbosus.com](https://appshunter.io/ios/topics/verbosus-com)

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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 2026-08-27.*