# Carbon Tech vs HeartKium

The clearest difference is in-app purchases: HeartKium at none against Carbon Tech's 7. Carbon Tech's advantage is update cadence (every 3 weeks vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Carbon Tech sells 7 one-off in-app purchases. HeartKium asks for nothing beyond the download.

Carbon Tech ships an update every 3 weeks, HeartKium every 6 months. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Carbon Tech | HeartKium |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/carbon-tech/id6475386118/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Free with in-app purchases | — |
| Size | 102 MB | 16 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ayltech](https://appshunter.io/developer/1724124350) | [Kiumtech](https://appshunter.io/developer/1815218521) |

## What reviewers say

### Carbon Tech

[App page](https://appshunter.io/ios/app/carbon-tech/id6475386118)

This app allows you to customize the LED screen on your AI-powered backpack. Create and upload text, images, or animations to express your personality and style. Connect via Bluetooth and personalize your backpack's display with ease.

**Highlights:** AI-powered backpack integration, Customizable LED screen, Upload text, images, and animations, Bluetooth connectivity, Modify backpack patterns, Adjust brightness, Activate dynamic display modes

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 coin | $0.99 | one-time |
| AI Backpack 500 Coins | $4.99 | one-time |
| AI Backpack 1000 Coins | $9.99 | one-time |
| AI Backpack 1500 Coins | $14.99 | one-time |
| AI Backpack 2000 Coins | $19.99 | one-time |
| AI Backpack 2500 Coins | $24.99 | one-time |
| AI Backpack 3000 Coins | $29.99 | one-time |


### HeartKium

[App page](https://appshunter.io/ios/app/heartkium/id6746115324)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Carbon Tech free?

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

### Is HeartKium free?

HeartKium is free to download, with no in-app purchases.

### Do Carbon Tech or HeartKium have ads?

Neither Carbon Tech nor HeartKium shows ads.

### Which is updated more often, Carbon Tech or HeartKium?

Carbon Tech ships an update every 3 weeks, and HeartKium every 6 months. Most recently, Carbon Tech was updated on October 30, 2026 and HeartKium on October 25, 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.*