# IYKYKnow vs Carbon Notes

The clearest difference is iOS requirement: IYKYKnow at 13.0 against Carbon Notes's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. IYKYKnow sells 2 one-off in-app purchases and Carbon Notes sells 2 in-app purchases, starting at $19.99 per month. Whichever you choose, the download price is not the number that matters.

IYKYKnow ships an update fortnightly, Carbon Notes every 3 weeks. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | IYKYKnow | Carbon Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (47 ratings)](https://appshunter.io/ios/app/iykyknow/id1526156980/reviews)** | — |
| Number of ratings | **47** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 12 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aniruddha Kadam](https://appshunter.io/developer/1526156982) | [YMMV](https://appshunter.io/developer/1224453829) |

## What reviewers say

### IYKYKnow

[App page](https://appshunter.io/ios/app/iykyknow/id1526156980)

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.

**Highlights:** Invisible message sending, Works with iMessage, SMS, WhatsApp, Telegram, Compatible with email apps, Privacy-focused, no server communication, Local encryption and decryption

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Icon Pack | $0.99 | one-time |
| App Secret Mode | $2.99 | one-time |


### Carbon Notes

[App page](https://appshunter.io/ios/app/carbon-notes/id6748026908)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $19.99 | per month |
| AI Unlock | $4.99 | one-time |


## Frequently asked questions

### Is IYKYKnow free?

IYKYKnow is free to download, with in-app purchases available.

### Is Carbon Notes free?

Carbon Notes is free to download, with in-app purchases available.

### Do IYKYKnow or Carbon Notes have ads?

Neither IYKYKnow nor Carbon Notes shows ads.

### Which is updated more often, IYKYKnow or Carbon Notes?

IYKYKnow ships an update fortnightly, and Carbon Notes every 3 weeks. Most recently, IYKYKnow was updated on November 3, 2026 and Carbon Notes on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*