Comparison

Crypto String vs Keywave.

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

Head to head
About

Crypto String

Features
Read full description

Crypto String is the ultimate secure text encryption app using military-grade AES-256-GCM with authentication. Protect your sensitive information with powerful encryption and Base64 encoding — all 100% offline and private. Core Features • AES-256-GCM Encryption – Military-grade algorithm with custom keys for unique results • Base64 Encode/Decode – Fast and reliable for data transmission and storage • File Import – Directly import text/keys from local files or iCloud Drive • Smart Key Management – Import keys + eye-icon toggle to view/hide safely • History Records – Auto-save last 10 operations with key hints (only first 4 chars) • Multilingual Interface – Automatic language switching • Dark Mode + iOS Native – Built with Apple CryptoKit for maximum security Security First • 100% Local Processing – Nothing uploaded to cloud • No data collection, no accounts, no tracking • Keys never stored in plain text • One-time purchase, no ads, no subscriptions Perfect for protecting passwords, notes, private messages, or business data. Simple, fast, and truly private. Download Crypto String now and encrypt with confidence!

About

Keywave.

Securely encrypt and decrypt messages directly on your device. Manage your PGP keys locally without any server interaction or data tracking. Offers robust key generation and import/export options with a clean interface.

Highlights
  • Encrypt and decrypt messages
  • Generate RSA keypairs
  • Manage unlimited keys
  • Import/export keys
  • Native SwiftUI interface
  • 100% local processing
Read full description

PGP encryption for people who value their privacy. Everything runs on your device. No servers, no tracking, no compromises. Keywave is a native iOS app for PGP encryption and decryption. Encrypt messages before sending them. Decrypt messages you receive. Manage your keys. That's it. Everything runs locally using Protonmail's open-source gopenpgp library. Your keys never leave your phone. Features: • Encrypt & decrypt messages with a tap • Generate 2048, 3072, or 4096-bit RSA keypairs • Store unlimited keys with search and filtering • Import from files, clipboard, or share extension • Export as ASCII Armored or Binary • Native SwiftUI interface with dark mode Why Keywave: • 100% local — no servers, no cloud, no network requests • Zero data collection — no analytics, no tracking • Built on Protonmail's battle-tested gopenpgp library • Keys stored securely in iOS Keychain • Compatible with GPG and other PGP tools Free. No ads. Works offline. Requires iOS 17.5+. New features coming in the next version: This will include a keyboard extension, and also adding support for encrypting and decrypting files. potentially could an encrypted file vault.

Screenshots

Crypto String3 screens
Keywave.3 screens

Verdict

The call

The clearest difference is price: Keywave. at Free against Crypto String's $0.99. On update cadence, 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

Keywave. is free to download; Crypto String costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Crypto String ships an update every 4 months, Keywave. every 6 months. The most recent releases landed on September 19, 2026 and September 1, 2026 respectively.

Scorecard1 real difference · 9 level
Crypto String versus Keywave.: the parameters behind the verdict, then further details
ParameterCrypto StringKeywave.
Price$0.99Free — better
Rating—2.8 (4 ratings) — better
Positive reviews—33.3% of reviews
Number of ratings—4 — better
Update frequencyEvery 4 months — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad — betteriPhone
Requires iOS18.017.6 — better
Further details — not scored
Size0 MB11 MB
Age rating4+4+
DeveloperXu WangWilliam Kelley

In-app purchases

None

Crypto String

No in-app purchases

None

Keywave.

No in-app purchases

Questions

Is Crypto String free?
Crypto String costs $0.99, with no in-app purchases.
Is Keywave. free?
Keywave. is free to download, with no in-app purchases.
Do Crypto String or Keywave. have ads?
Neither Crypto String nor Keywave. shows ads.
Which is updated more often, Crypto String or Keywave.?
Crypto String ships an update every 4 months, and Keywave. every 6 months. Most recently, Crypto String was updated on September 19, 2026 and Keywave. on September 1, 2026.

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