# UnderForge vs kCalori

The clearest difference is update cadence: kCalori at every 2 days against UnderForge's every 10 days. UnderForge's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. UnderForge sells 3 in-app purchases, starting at $3.99 per 7 days and kCalori sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UnderForge ships an update every 10 days, kCalori every 2 days. Both last shipped on November 9, 2026.

## The numbers

| Metric | UnderForge | kCalori |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 2 days** |
| Size | 128 MB | 20 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 17+ | 17+ |
| Developer | [Venture CO Group Korlatolt Felelossegu Tarsasag](https://appshunter.io/developer/6800294425) | [Milan Marek](https://appshunter.io/developer/1883006800) |

## What reviewers say

### UnderForge

[App page](https://appshunter.io/ios/app/underforge/id6758098630)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnderForge Premium Weekly | $3.99 | per 7 days |
| UnderForge Premium Quarterly | $29.99 | per 3 months |
| UnderForge Premium Yearly | $89.99 | per year |


### kCalori

[App page](https://appshunter.io/ios/app/kcalori-calorie-tracker/id6760182041)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Měsíční Předplatné | $3.99 | per month |
| Roční Předplatné | $29.99 | per year |


## Frequently asked questions

### Is UnderForge free?

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

### Is kCalori free?

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

### Do UnderForge or kCalori have ads?

Neither UnderForge nor kCalori shows ads.

### Which is updated more often, UnderForge or kCalori?

UnderForge ships an update every 10 days, and kCalori every 2 days. Most recently, UnderForge was updated on November 9, 2026 and kCalori on November 9, 2026.

---

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