Atom Messenger vs TempChat
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Atom Messenger
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Atom is the integrated messaging solution for organizations or individuals that require maximum security. The combination of Atom's proven security architecture and absolute data ownership create an independent chat environment that is unmatched in terms of confidentiality. PRIVACY AND ANONYMITY Atom is designed to generate the least amount of metadata possible without keeping conversations inside the phone. Each user is anonymous and registration takes place only through direct invitation from the administrator of the single node. SECURE ENCRYPTION Atom performs full end-to-end encryption of all communications exchanged. Only the intended recipient, and No one else, will be able to read your messages. Encryption keys are generated and securely stored on user devices to prevent copying or backdoor access. FULL FEATURED Atom is not only a messenger for encrypted and confidential communications: it is also a versatile and feature-rich tool. โข Make voice calls โข Compose texts and send voice messages โข Send any type of file (pdf animated gif, mp3, doc, zip, etc...) โข Create group chats, add and remove members at any time โข Profile security settings for cancellation due to inactivity or for managing the self-preservation of communications โข Settings to define messages that self-destruct on reading or timed โข Verify a contact's identity by scanning their personal QR code โข Use Atom as an anonymous instant messaging tool SELF HOSTED SERVERS Atom messenger has a decentralized infrastructure where individual servers are isolated from each other. The application allows you to connect to multiple nodes that you can access by invitation or as an administrator (who purchases and manages an instance of the platform) FULL ANONYMITY Each Atom user receives a random ATOM ID that identifies him. No phone number or email address is required to use Atom. This exclusive feature allows you to use Atom completely anonymously: you don't need to give private information and you don't need to open an account. NO ADVERTISING, NO TRACKER Atom is not funded by advertising and does not collect user data. ASSISTANCE/CONTACTS If you have any questions or problems, check out our website: https://atomapp.cloud
TempChat
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This is TempChat. TempChat is a simple and end-to-end encrypted chat client. Add your friends and talk privately. All messages will be removed completely from the server after 10 days. So don't leave anything important in here, that you might need later. To be extra secure, you can host your own server, and be in full control of your own data. Be aware that your privatekey lives on your device, meaning your chat history will only be available on the device where you created your account. This also means, you can't login to your account on a different device, and see old messages. This is on purpose, to keep your chat as private as possible. We also tend to not store/cache anything on your device. This means you will have to fetch everything from the server, resulting in longer waiting than you're used to from other messaging apps. This is also on purpose, to keep your chat as private as possible.
Screenshots
Verdict
The clearest difference is iOS requirement: Atom Messenger at 16.0 against TempChat's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Atom Messenger ships an update every 3 weeks, TempChat every 2 weeks. The most recent releases landed on September 6, 2026 and September 10, 2026 respectively.
| Parameter | Atom Messenger | TempChat |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 2 weeks โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPad โ better |
| Requires iOS | 16.0 โ better | 18.0 |
| Further details โ not scored | ||
| Size | 42 MB | 22 MB |
| Age rating | 17+ | 4+ |
| Developer | igloocy s.r.l. | Nicolai Harbo |
In-app purchases
Atom Messenger
No in-app purchases
TempChat
No in-app purchases








