# Strontium vs I

The clearest difference is rating: I at 5.0 against Strontium's 1.8. I also leads on review sentiment (50% vs 11%) and in-app purchases (none vs 2). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Strontium sells 2 one-off in-app purchases. I asks for nothing beyond the download.

I holds the better App Store score, 5.0 against 1.8. Both are backed by a comparable volume of ratings — 4 and 5 respectively. Written reviews point the same way: 11% of Strontium's written reviews are positive against 50% of I's.

Strontium ships an update every 5 months, I every 9 days. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Strontium | I |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (4 ratings)](https://appshunter.io/ios/app/strontium/id1050123100/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/i-usbkey-pro/id1258469579/reviews)** |
| Number of ratings | 4 | **5** |
| Positive reviews | 10.5% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 9 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 132 MB | 40 MB |
| Requires iOS | 8.0 | 8.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [i-FlashDrive Inc.](https://appshunter.io/developer/1387757454) | [zhong qibiao](https://appshunter.io/developer/1118837284) |

## What reviewers say

### Strontium

[App page](https://appshunter.io/ios/app/strontium/id1050123100)

Easily manage and transfer photos, music, videos, and files between your Apple devices. Offers secure storage, direct media playback, and backup options for contacts and your camera roll.

**Highlights:** Secure data storage, Direct media playback, Backup and restore contacts, Lightning transfer between devices, Auto file management, Supports numerous file formats

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calendar Backup | Free | one-time |
| Zip/unzip files support | $0.99 | one-time |


### I

[App page](https://appshunter.io/ios/app/i-usbkey-pro/id1258469579)

Manage all your files on iOS devices with ease. This app allows you to exchange files between different devices and platforms, back up contacts and camera roll, and play media directly from your device. It supports a wide range of document, image, audio, and video file formats.

**Highlights:** File management for iOS devices, Cross-device file exchange, Contact and camera roll backup, Video and music playback, Image and document preview, Support for various file formats

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Strontium free?

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

### Is I free?

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

### Which has better reviews, Strontium or I?

I is rated higher. Strontium averages 1.8 out of 5 from 4 ratings, while I averages 5.0 from 5 ratings.

### Do Strontium or I have ads?

Neither Strontium nor I shows ads.

### Which is updated more often, Strontium or I?

Strontium ships an update every 5 months, and I every 9 days. Most recently, Strontium was updated on October 24, 2026 and I on October 22, 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.*