IYKYKnow vs Chartes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IYKYKnow
This utility app allows you to send invisible messages within your existing messaging applications. It helps maintain privacy and avoid suspicion when communicating secretly. The app ensures no server communication for encryption, keeping your data local.
- Invisible message sending
- Works with iMessage, SMS, WhatsApp, Telegram
- Compatible with email apps
- Privacy-focused, no server communication
- Local encryption and decryption
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The message sent using IYKYK keyboard app. Is completely invisible to anyone try to read your private messages. It avoid suspicion, If you are chatting with someone in secret. Remember to use this for private use and not to misuse. IYKYK app respects privacy. So there is no server communication for encryption and decryption process. Anyone who has access to "IYKYK" app will be able to decrypt the hidden message. Compatible with: - iMessage, SMS, Whatsapp, Telegram.. etc - Any Emailing app : Gmail, Yahoo MAIL...etc In conclusion ...any text messaging app
Chartes
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Chartes delivers professional PDF scanning with complete privacy with zero complexity. 100% Offline. No subscription. No watermark. Multi-Language Support English, Chinese, and Spanish. SCAN TO PDF INSTANTLY Turn any document into a crisp PDF in seconds. Receipts, contracts, notes, letters - capture with your camera and export as a professional PDF ready to share. Multi-page support lets you scan entire documents in one session. PRECISION CROPPING Frame your scans perfectly with preset aspect ratios: Letter, Legal, A4, Half Letter, or freeform. Every PDF looks clean and properly formatted. ENHANCE YOUR SCANS Apply filters to optimize readability. Keep original color for photos and graphics. Use grayscale for general documents. Choose black and white for maximum clarity on text-heavy pages. Rotate pages to perfect orientation. SHARE ANYWHERE Export your PDFs instantly to email, messaging apps, cloud storage, or any app on your device. Choose standard quality for smaller files or high quality for archival-grade output. SUPPORT 4 LANGUAGES English, Traditional Chinese, Simplified Chinese, and Spanish PRIVACY BY DESIGN Your PDFs never leave your device. No cloud uploads. No account required. No tracking or analytics. Scan sensitive documents with confidence - everything stays local. PAY ONCE, OWN FOREVER No subscriptions. No in-app purchases. No ads. Just a thoughtfully crafted PDF scanner that respects your time and privacy. ORGANIZE YOUR SCANS - Automatic file naming or custom names - Visual library shows all PDFs at a glance - Rename documents anytime - Bulk select and delete - View page count, file size, and creation date FEATURES - Instant PDF creation - Multi-page scanning - Precision cropping with presets - Color, grayscale, and B&W filters - Page rotation - Flash control for low light - Local-only storage - No subscription From the Greek chartes, meaning "paper" Pay once, own forever. Built with Love by AiofEffect LLC Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aiofeffect.com/privacy Terms & Conditions: https://aiofeffect.com/terms
Screenshots
Verdict
The clearest difference is update cadence: IYKYKnow at fortnightly against Chartes's every 6 weeks. IYKYKnow also leads on iOS requirement (13.0 vs 15.1). 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. IYKYKnow sells 2 one-off in-app purchases and Chartes sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
IYKYKnow ships an update fortnightly, Chartes every 6 weeks. The most recent releases landed on October 5, 2026 and October 3, 2026 respectively.
| Parameter | IYKYKnow | Chartes |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (48 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 48 — better | — |
| Update frequency | Fortnightly — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 18 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Aniruddha Kadam | Aiofeffect LLC |
In-app purchases
IYKYKnow
- Icon Pack$0.99
- App Secret Mode$2.99
Chartes
- Chartes Lifetime$1.99
