# Rough Diamond Calculator vs IYKYKnow

The clearest difference is update cadence: IYKYKnow at fortnightly against Rough Diamond Calculator's every 38 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Rough Diamond Calculator sells 3 in-app purchases, starting at $1.99 per 7 days and IYKYKnow sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Rough Diamond Calculator ships an update every 38 months, IYKYKnow fortnightly. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Rough Diamond Calculator | IYKYKnow |
| --- | --- | --- |
| 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 | Every 38 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 51 MB | 18 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gorasiya Vishal Nanjibhai](https://appshunter.io/developer/1287086933) | [Aniruddha Kadam](https://appshunter.io/developer/1526156982) |

## What reviewers say

### Rough Diamond Calculator

[App page](https://appshunter.io/ios/app/rough-diamond-calculator/id1343735836)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Yearly | $9.99 | per year |
| Lifetime | $19.99 | one-time |


### 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 |


## Frequently asked questions

### Is Rough Diamond Calculator free?

Rough Diamond Calculator is free to download, with in-app purchases available.

### Is IYKYKnow free?

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

### Do Rough Diamond Calculator or IYKYKnow have ads?

Neither Rough Diamond Calculator nor IYKYKnow shows ads.

### Which is updated more often, Rough Diamond Calculator or IYKYKnow?

Rough Diamond Calculator ships an update every 38 months, and IYKYKnow fortnightly. Most recently, Rough Diamond Calculator was updated on November 2, 2026 and IYKYKnow on November 3, 2026.

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