CryptKB vs MoodCycle AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CryptKB
Encrypt messages and files locally on your device before sending. Use a custom keyboard or Messages extension to easily encrypt and decrypt content with a password. Your data remains private with no account creation or backend servers.
- Local encryption/decryption
- Custom keyboard integration
- Messages extension
- AES-256-GCM encryption
- ASCII-safe payload
- Password saving with Face ID/passcode
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CryptKB helps you encrypt message text before it leaves your iPhone or iPad. Use the custom keyboard to write a message, choose a password, and insert an encrypted payload into Messages or another text field. Or open the Messages extension to stage a CryptKB bubble inside a Messages draft. The other person can open the same payload in CryptKB and decrypt it locally with the matching password. Why people use CryptKB: - Local encrypt and decrypt on device - Custom keyboard for ordinary text fields - Messages extension for composing and opening CryptKB bubbles - AES-256-GCM encryption with PBKDF2-HMAC-SHA256 key derivation - ASCII-safe payload format for copy, paste, and sharing - Optional saved conversation passwords protected by Face ID or device passcode - No account creation, no backend relay, no analytics SDKs, and no ad tracking in the app - Built-in playground, settings, privacy notes, and diagnostics How it works: 1. Switch to CryptKB Keyboard. 2. Type your message. 3. Enter a password. 4. Tap Encrypt & Insert. 5. Review the encrypted text and tap Send yourself. To decrypt, paste or open a CryptKB payload, enter the matching password, and read the plaintext locally. CryptKB intentionally reveals decrypted text in a local panel instead of writing it back into the conversation automatically. Important platform notes: - Apple does not allow third-party keyboards to tap the host app's Send button, so sending is always manual. - Password recovery is not possible by design. - CryptKB protects message content inside its encrypted payload, not message metadata like recipients, timestamps, screenshots, or notification previews.
MoodCycle AI
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MoodCycle AI is the first AI-powered emotional cycle predictor designed for women who want to understand their mood patterns before they happen. Unlike traditional period trackers that only show what already happened, MoodCycle AI learns your unique emotional rhythms and predicts mood changes 7-14 days in advance with personalized insights. WHY WOMEN CHOOSE MOODCYCLE AI: PREDICTIVE INTELLIGENCE Our on-device AI analyzes your logged moods alongside your cycle data to forecast emotional patterns. Know when you might feel low energy, irritable, or at your best - before it happens. PRIVACY-FIRST DESIGN Your health data stays on your device. We use Apple's secure SwiftData framework with no cloud uploads. Optional Face ID/Touch ID protection. Your data, your control. PERSONALIZED LEARNING The more you log, the smarter it gets. After 2-3 cycles, predictions become highly accurate and tailored to YOUR unique patterns, not generic templates. COMPREHENSIVE TRACKING • Daily mood logging with emoji and detailed notes • Menstrual cycle tracking with period predictions • Energy level monitoring • Symptom logging (cramps, headaches, bloating, etc.) • Sleep and activity correlation • Apple HealthKit integration (optional) ACTIONABLE INSIGHTS Get context-aware recommendations based on your cycle phase. Understand why you feel certain ways and discover patterns you never noticed. PARTNER SHARING (Optional) Share cycle information with trusted partners through secure, permission-based sharing. They'll know when to bring chocolate or give you space. DATA CONTROL • Export all your data anytime (JSON/CSV) • One-tap data deletion • No account required • No ads, ever FOR WOMEN WITH: • PMDD or severe PMS • Irregular cycles • Emotional self-awareness goals • Partners who want to be supportive MoodCycle AI empowers you with knowledge about your body and emotions. Plan your month with confidence, understand yourself better, and never be caught off guard by mood swings again. Download now and start your journey to emotional cycle mastery. --- Note: MoodCycle AI is a wellness app for self-tracking and awareness. It does not provide medical advice, diagnosis, or treatment. Always consult healthcare providers for medical concerns.
Screenshots
Verdict
The clearest difference is price: CryptKB at Free against MoodCycle AI's $2.99. On ads, in-app purchases, device support and iOS requirement 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
CryptKB is free to download; MoodCycle AI costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | CryptKB | MoodCycle AI |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17 |
| Further details — not scored | ||
| Size | 5 MB | 2 MB |
| Age rating | 4+ | 9+ |
| Developer | Seth Farrington18896201822 | 贺 周 |
In-app purchases
CryptKB
No in-app purchases
MoodCycle AI
No in-app purchases









