# Obelus Calculator vs I

The clearest difference is iOS requirement: I at 15.0 against Obelus Calculator's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Obelus Calculator ships an update weekly, I every 5 days. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Obelus Calculator | I |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Size | 1 MB | 53 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Chris Wang](https://appshunter.io/developer/1723706836) | [Ronald Avila](https://appshunter.io/developer/1592838539) |

## What reviewers say

### Obelus Calculator

[App page](https://appshunter.io/ios/app/obelus-calculator/id6475239824)

**In-app purchases:** none


### I

[App page](https://appshunter.io/ios/app/i-charj/id6760969449)

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

**In-app purchases:** none


## Frequently asked questions

### Is Obelus Calculator free?

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

### Is I free?

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

### Do Obelus Calculator or I have ads?

Neither Obelus Calculator nor I shows ads.

### Which is updated more often, Obelus Calculator or I?

Obelus Calculator ships an update weekly, and I every 5 days. Most recently, Obelus Calculator was updated on November 8, 2026 and I on November 9, 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.*