---
title: "ONE - keep it private - Reviews, Revenue and Downloads in Germany | Apple App Store"
description: "ONE enables 100% secure communication with iOS devices. The ONE principle is based on the only proven secure communication method, OneTimePad (OTP). A message encrypted with ONE can only be decrypted "
---

# ONE - keep it private — Germany

![ONE App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/aa/65/1b/aa651bcc-b033-964e-3a71-72377716d74b/AppIcon-1x_U007emarketing-0-1-85-220-0.png/400x400bb.png)

**Developer:** [Christian Hell](https://apptail.io/developer/christian-hell-YVme)
**Category:** Utilities
**Rating:** 5.0/5 (3 ratings)
**Price:** Free
**Bundle ID:** com.neelixx.otp
**Store:** Apple App Store
**Country:** Germany
**Version:** 2.1.0 (released 2026-03-25)
**Original Release:** 2018-11-30

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/de/app/app/id1399893476)
**AppTail Page:** [https://apptail.io/app/onecryption-qAEb/germany](https://apptail.io/app/onecryption-qAEb/germany)

## ONE Description
ONE enables 100% secure communication with iOS devices. The ONE principle is based on the only proven secure communication method, OneTimePad (OTP).
A message encrypted with ONE can only be decrypted by the recipient. No one else can read the message, regardless of time and resources.

- Use your iPhone for absolutely secure communication
- Encrypt files, images or even simple texts.
- Generate keys of up to 40MB for free in the app
- Larger keys are available via InApp purchases

How does ONE work:
You create a key that is assigned to a contact or a group. Now you have to meet the contact person or other group members and exchange the key via Bluetooth. This ensures that the key is only present on the sender's and receiver's devices.
Please note: In order to exchange the key securely, it is necessary that the key is not transmitted via the Internet. The safest way is to exchange the key via Airdrop. 
The encrypted messages or files, on the other hand, can be transmitted unprotected in any way, as they cannot be deciphered by curious eyes.

## ONE Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/aa/28/52/aa28523e-971f-e89a-ccdf-c15d9e232743/pr_source.png/392x696bb.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/93/0f/43/930f4386-41dd-0fb3-8bd6-5ffd25a35c42/pr_source.png/392x696bb.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/f1/4f/4b/f14f4ba3-3ac1-450c-d5ec-bdfcf53227c0/pr_source.png/392x696bb.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/02/23/cf/0223cfb9-769f-35c7-b63c-e5cf40dc7398/pr_source.png/392x696bb.png)

## ONE Rating Breakdown in Germany
- 5 stars: 3 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)


## ONE In-App Purchases
| Item | Price |
|------|-------|
| Key of size 100MB | €0.99 |
| Key of size 500MB | €1.99 |


## ONE Discovered Keywords
- one
- keep it private

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- [Encrypt-it](https://apptail.io/app/encrypt-it-ZWPb/germany)
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- [PRIVUS SecurLine Messenger](https://apptail.io/app/privus-securline-messenger-Knwc/germany)
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- [IMPaCT Intell](https://apptail.io/app/impact-intell-niVc/germany)
- [Efficient Meeting Tools](https://apptail.io/app/efficient-meeting-tools-coHm/germany)
- [Acter](https://apptail.io/app/acter-pTJn/germany)
- [Speech to Text - Transcriber](https://apptail.io/app/speech-to-text-transcriber-ZLjp/germany)

## ONE Available In
- [Germany](https://apptail.io/app/onecryption-qAEb/germany)
- [Hong Kong SAR China](https://apptail.io/app/onecryption-qAEb/hong-kong)
- [United States](https://apptail.io/app/onecryption-qAEb/united-states)
- [Australia](https://apptail.io/app/onecryption-qAEb/australia)
- [Azerbaijan](https://apptail.io/app/onecryption-qAEb/azerbaijan)
- [Belgium](https://apptail.io/app/onecryption-qAEb/belgium)
- [Bulgaria](https://apptail.io/app/onecryption-qAEb/bulgaria)
- [Brazil](https://apptail.io/app/onecryption-qAEb/brazil)
- [Belarus](https://apptail.io/app/onecryption-qAEb/belarus)
- [Canada](https://apptail.io/app/onecryption-qAEb/canada)
- [Switzerland](https://apptail.io/app/onecryption-qAEb/switzerland)
- [Chile](https://apptail.io/app/onecryption-qAEb/chile)
- [China](https://apptail.io/app/onecryption-qAEb/china)
- [Czechia](https://apptail.io/app/onecryption-qAEb/czechia)
- [Denmark](https://apptail.io/app/onecryption-qAEb/denmark)
- [Dominican Republic](https://apptail.io/app/onecryption-qAEb/dominican-republic)
- [Algeria](https://apptail.io/app/onecryption-qAEb/algeria)
- [Ecuador](https://apptail.io/app/onecryption-qAEb/ecuador)
- [Egypt](https://apptail.io/app/onecryption-qAEb/egypt)
- [Spain](https://apptail.io/app/onecryption-qAEb/spain)
- [Finland](https://apptail.io/app/onecryption-qAEb/finland)
- [United Kingdom](https://apptail.io/app/onecryption-qAEb/united-kingdom)
- [Greece](https://apptail.io/app/onecryption-qAEb/greece)
- [Croatia](https://apptail.io/app/onecryption-qAEb/croatia)
- [Hungary](https://apptail.io/app/onecryption-qAEb/hungary)
- [Indonesia](https://apptail.io/app/onecryption-qAEb/indonesia)
- [Ireland](https://apptail.io/app/onecryption-qAEb/ireland)
- [Israel](https://apptail.io/app/onecryption-qAEb/israel)
- [India](https://apptail.io/app/onecryption-qAEb/india)
- [Iceland](https://apptail.io/app/onecryption-qAEb/iceland)
- [Italy](https://apptail.io/app/onecryption-qAEb/italy)
- [Japan](https://apptail.io/app/onecryption-qAEb/japan)
- [South Korea](https://apptail.io/app/onecryption-qAEb/south-korea)
- [Kuwait](https://apptail.io/app/onecryption-qAEb/kuwait)
- [Cayman Islands](https://apptail.io/app/onecryption-qAEb/cayman-islands)
- [Kazakhstan](https://apptail.io/app/onecryption-qAEb/kazakhstan)
- [Lebanon](https://apptail.io/app/onecryption-qAEb/lebanon)
- [Lithuania](https://apptail.io/app/onecryption-qAEb/lithuania)
- [Latvia](https://apptail.io/app/onecryption-qAEb/latvia)
- [Mexico](https://apptail.io/app/onecryption-qAEb/mexico)
- [Malaysia](https://apptail.io/app/onecryption-qAEb/malaysia)
- [Nigeria](https://apptail.io/app/onecryption-qAEb/nigeria)
- [Netherlands](https://apptail.io/app/onecryption-qAEb/netherlands)
- [Norway](https://apptail.io/app/onecryption-qAEb/norway)
- [Nepal](https://apptail.io/app/onecryption-qAEb/nepal)
- [New Zealand](https://apptail.io/app/onecryption-qAEb/new-zealand)
- [Panama](https://apptail.io/app/onecryption-qAEb/panama)
- [Philippines](https://apptail.io/app/onecryption-qAEb/philippines)
- [Pakistan](https://apptail.io/app/onecryption-qAEb/pakistan)
- [Poland](https://apptail.io/app/onecryption-qAEb/poland)
- [Portugal](https://apptail.io/app/onecryption-qAEb/portugal)
- [Romania](https://apptail.io/app/onecryption-qAEb/romania)
- [Russia](https://apptail.io/app/onecryption-qAEb/russia)
- [Saudi Arabia](https://apptail.io/app/onecryption-qAEb/saudi-arabia)
- [Sweden](https://apptail.io/app/onecryption-qAEb/sweden)
- [Singapore](https://apptail.io/app/onecryption-qAEb/singapore)
- [Thailand](https://apptail.io/app/onecryption-qAEb/thailand)
- [Türkiye](https://apptail.io/app/onecryption-qAEb/turkey)
- [Taiwan](https://apptail.io/app/onecryption-qAEb/taiwan)
- [Ukraine](https://apptail.io/app/onecryption-qAEb/ukraine)
- [Uzbekistan](https://apptail.io/app/onecryption-qAEb/uzbekistan)
- [Vietnam](https://apptail.io/app/onecryption-qAEb/vietnam)
- [United Arab Emirates](https://apptail.io/app/onecryption-qAEb/united-arab-emirates)
- [South Africa](https://apptail.io/app/onecryption-qAEb/south-africa)
- [Argentina](https://apptail.io/app/onecryption-qAEb/argentina)
- [Austria](https://apptail.io/app/onecryption-qAEb/austria)

---

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