Post Quantum Secure Chat vs DoU
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Post Quantum Secure Chat
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Secure messaging for the quantum era. PQC Chat is the first consumer messaging app built with NIST-standardized post-quantum cryptography. While traditional encryption may be vulnerable to future quantum computers, PQC Chat uses ML-KEM-768 and ML-DSA-44 algorithms to ensure your private conversations remain private — today and tomorrow. Why Post-Quantum Security Matters Quantum computers pose a real threat to current encryption standards. Data encrypted today could be stored and decrypted later when quantum computers become powerful enough. PQC Chat protects you against this "harvest now, decrypt later" threat. Key Features • True End-to-End Encryption — Messages are encrypted on your device and can only be read by the intended recipient. Not even we can access your conversations. • NIST-Approved Algorithms — Built with ML-KEM-768 for key exchange and ML-DSA-44 for digital signatures, the same standards adopted by governments worldwide. • Secure Image Sharing — Photos are encrypted before leaving your device, ensuring complete privacy for all shared media. • QR Code Contact Verification — Verify contacts in person by scanning QR codes, preventing man-in-the-middle attacks. • Real-Time Messaging — Instant message delivery with read receipts and typing indicators. • No Phone Number Required — Create an account without sharing personal information. • Cross-Platform — Message friends on any device seamlessly. Privacy by Design - No message content stored on servers - No tracking or analytics - No ads, ever - Open cryptographic standards About Post-Quantum Cryptography PQC Chat implements the Federal Information Processing Standards (FIPS) 203 and 204, published by the National Institute of Standards and Technology (NIST) in August 2024. These represent the gold standard in quantum-resistant cryptography. Protect your conversations for the future. Download PQC Chat today. Terms of Use (EULA): https://pqcnow.com/terms-of-service
DoU
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DoU is a messaging app designed with a strong focus on user privacy. Unlike traditional messaging apps, DoU is not based on contacts but on an invitation-based system, allowing only invited users to communicate within chat rooms. Without unnecessary connections, DoU provides a simple and trustworthy privacy messenger where you can safely communicate with the people who matter. If the owner deletes the data, it will be removed from the server, and no third parties, including DoU, will have access to it. ■ Features of DoU 1. Place Create a conversation space called a Place, invite friends you want to chat with, and start private conversations once they accept the invitation. 2. Contact-based Invitations You can easily invite friends by syncing your contacts. 3. Focused Group Chats DoU supports group chats with up to 100 participants, enabling more focused conversations and active participation. 4. Chat with Myself Use the Chat with Myself feature as a personal memo space for notes, to-do lists, and quick ideas. 5. Quick Search Easily find chat rooms or Places by searching their names. Terms of Use: https://app.chatic.io/policy/terms Privacy Policy: https://app.chatic.io/policy/privacy
Screenshots
Verdict
The clearest difference is update cadence: DoU at every 3 days against Post Quantum Secure Chat's every 10 days. Post Quantum Secure Chat's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Post Quantum Secure Chat sells 2 in-app purchases, starting at $4.99 per month and DoU sells 1 in-app purchase, starting at $6.00 per month. Whichever you choose, the download price is not the number that matters.
Post Quantum Secure Chat ships an update every 10 days, DoU every 3 days. The most recent releases landed on October 4, 2026 and October 18, 2026 respectively.
| Parameter | Post Quantum Secure Chat | DoU |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 10 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 35 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | SAYMATIK BILISIM VE TEKNOLOJI ANONIM SIRKETI | Lemon Cloud Co., Ltd. |
In-app purchases
Post Quantum Secure Chat
- Monthly Subscription$4.991 Month
- Annual Subscription$29.991 Year
DoU
- DoU Pro 1 (1 Account)7 Days trial$6.001 Month
Questions
Is Post Quantum Secure Chat free?
Is DoU free?
Do Post Quantum Secure Chat or DoU have ads?
Which is updated more often, Post Quantum Secure Chat or DoU?
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