Comparison

OK.secure vs ZERO Messenger

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

OK.secure

This app offers private, end-to-end encrypted messaging and a secure crypto wallet. Communicate freely with voice, video calls, and file sharing, all protected by blockchain technology and a zero-knowledge principle. Manage your digital assets with integrated DeFi features.

Highlights
  • End-to-end encrypted messaging
  • Voice and video calls
  • File and screen sharing
  • Non-custodial crypto wallet
  • DeFi and crypto trading
  • Blockchain technology
Features
Read full description

Private Encrypted Messenger & Crypto Wallet platform. The OK.secure app with end-to-end encryption based on blockchain technology for your private and secure communication. OK.secure only requires your internet connection. NO telephone charges for calls, chat with your friends or make a video call with family, friends or colleagues at no additional cost from anywhere in the world. > Encrypted Messenger with File-Sharing - Chat feature with group chat - Receive messages only AFTER accepted invitation; communicate securely and exclusively with your contacts, no threat to privacy - Voice and video calls: Call your friends, family, colleagues and partners anywhere in the world - Screen sharing, privately share your screen with your contacts during the call (web application) - Share files securely and privately, including photos, videos, and voice messages (web application) - Military-grade end-to-end encryption for all features (256-bit AES encryption; RSA 2048-bit key cryptography; Elliptic Curve Cryptography; PBKDF2 key derivation with SHA-256 hashing) OK.secure is simple, FREE and easy to use. OK.secure protects your privacy by encrypting all of your messages and data at NO EXTRA CHARGE. We offer the highest level of security and privacy. Our OK.secure platform operates on a ZERO-KNOWLEDGE principle, providing complete data security. No one but you has access to YOUR personal information. OK.secure privacy features include: * End-to-end encrypted communications and data * Blockchain technology for decentralized digital identities * Decentralized cloud storage * Zero knowledge concept - we can never see your messages or data * Push notifications notify you when new messages arrive * Integrated into the OK.secure web application - use the full range of features from your PC / Mac * Protected privacy - your encrypted data is never be shared with third parties > Crypto Wallet In addition to being a secure messenger, our latest update includes the all-new Crypto Wallet, a one-stop shop for all your crypto needs. Keep all your valuable and private crypto assets in one secure place with end-to-end encryption built into the blockchain. * Store: Keep all your crypto in the most secure place in your own non-custodial crypto wallet (BTC wallet, Ethereum wallet) built into the OK.secure app * DeFi: Buy and trade digital assets from your crypto wallet Wallet features: * Non-custodial multi-cryptocurrency wallet with Bitcoin, Ethereum & Binance Smart Chain support * Crypto/Fiat exchange * Send/request/pay crypto directly in chat * QR scan for easy crypto payments * Biometric authentication * Buy gift cards and vouchers with crypto Visit our knowledge-base: https://www.ok.de/faq Follow us: https://business.facebook.com/OK.de.email What happens in OK.secure stays in OK.secure!

About

ZERO Messenger

A secure and private messaging app built on decentralized architecture. It offers end-to-end encryption, Web3 integration, and no ads or surveillance. Reclaim your digital rights with this free, anonymous communication tool.

Highlights
  • Decentralized architecture
  • End-to-end encryption
  • Web3 wallet login
  • Token-gated chats
  • Cross-device access
  • No phone number required
  • Sleek and minimal design
Features
Read full description

Decentralized messaging for everyone. ZERO Messenger is secure, private, and free. No ads, no surveillance – reclaim your digital rights with ZERO. Decentralized - ZERO Messenger is built on decentralized architecture. Encrypted data is hosted on and shared between ZODEs; you can choose which ZODE will host your account, or you can run one of your own! Private - All conversations are end-to-end encrypted. No ads, no surveillance, completely anonymous; users are not required to provide personal data to create an account. Web3-Native - ZERO Messenger boasts Web3 (Ethereum) wallet login, identity verification with ZERO ID, the ability to create and join token-gated chats, and more. All Your Devices - Available on Web and Mobile. Access your conversations on all your devices. Secure Conversations of Any Size - Collaborate and share with individuals or groups of people in private, encrypted conversations. No Phone Number Required - Sign up with an Ethereum wallet and verify your identity with a ZERO ID. Sleek and Minimal - Designed with simplicity and ease of use in mind. Who are we? ZERO is a small startup empowering the citizens of our digital age with Web3 and decentralized technology. ZERO apps are built according to our values: Sovereignty, Decentralization, Security, Open Source, and Censorship Resistance.

Screenshots

OK.secure4 screens
ZERO Messenger4 screens

Verdict

The call

The clearest difference is update cadence: ZERO Messenger at weekly against OK.secure's every 6 weeks. ZERO Messenger also leads on monetization model (free vs free with in-app purchases) and review sentiment (78% vs 58%). OK.secure's advantage is iOS requirement (16.6 vs 18.5). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

OK.secure ships an update every 6 weeks, ZERO Messenger weekly. The most recent releases landed on September 19, 2026 and July 8, 2026 respectively.

Scorecard4 real differences · 6 level
OK.secure versus ZERO Messenger: the parameters behind the verdict, then further details
ParameterOK.secureZERO Messenger
PriceFreeFree
Rating—4.7 (15 ratings) — better
Positive reviews58.3% of reviews77.8% of reviews — better
Number of ratings—15 — better
Update frequencyEvery 6 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.6 — better18.5
Further details — not scored
Size100 MB248 MB
Age rating12+4+
DeveloperOK.de Services GmbHZero to Infinity, Inc.

Customer experience

OK.secure

Written reviews12 reviews
Positive58.3%
Neutral0.0%
Negative41.7%

ZERO Messenger

All ratings15 ratings
Positive93.3%
Neutral0.0%
Negative6.7%
Written reviews9 reviews
Positive77.8%
Neutral0.0%
Negative22.2%

In-app purchases

None

OK.secure

No in-app purchases

None

ZERO Messenger

No in-app purchases

Questions

Is OK.secure free?
OK.secure is free to download, with no in-app purchases.
Is ZERO Messenger free?
ZERO Messenger is free to download, with no in-app purchases.
Do OK.secure or ZERO Messenger have ads?
Neither OK.secure nor ZERO Messenger shows ads.
Which is updated more often, OK.secure or ZERO Messenger?
OK.secure ships an update every 6 weeks, and ZERO Messenger weekly. Most recently, OK.secure was updated on September 19, 2026 and ZERO Messenger on July 8, 2026.

Other comparisons