U8 vs Diskio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
U8
Transfer and back up any file wirelessly between your mobile devices and computers without using mobile data. Experience ultra-fast speeds for seamless file management and sharing across different platforms.
- Zero-flow wireless file transfer
- Ultra-fast transmission speeds (up to 30MB/s)
- File backup and management
- Cross-platform compatibility
- Supports various file formats
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Mobile phone USB flash drive-file transfer and backup artifact Zero-flow transmission of any file, does not consume a trillion traffic, does not cost a penny. Mobile phone USB flash drive is a cross-platform, easy to operate, ultra-fast transmission speed of extremely fast file backup tools. You only need to transfer files in the same LAN through a computer browser -Software features- 1 free flow 2 File transfer speed is ultra-fast: kill Bluetooth 100 times, and the fastest speed can reach 30Mb/s. 3 Backup Files: You can browse and manage all formats supported by iOS and photos, videos, music and other files. 4 Cross-platform transmission: iOS mobile phones and other iOS mobile phones, and desktop device platforms, free transmission. 5 Powerful: Transmit photos, videos, music and other files in various formats in the same LAN. The function of mobile phone USB flash drive is small and powerful, which is a rare tool in your daily life. Come and try it quickly! ;
Diskio
This utility app provides precise speed tests for all your storage devices, from internal iPhone storage to external USB drives. Customize test parameters for detailed insights and identify performance bottlenecks. It offers a simple three-step process to analyze your storage's true capabilities.
- Precise disk speed testing
- Tests internal and external storage
- Customizable test parameters
- Simple three-step process
- Universally compatible with iOS devices
- Identifies performance bottlenecks
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How fast is your storage? Measure sequential read and write speeds on your iPhone or a compatible external drive. Go beyond one number with repeat runs and a detailed report. SEE THE WHOLE RESULT Choose 1, 3 or 6 runs. With 3 or 6 runs, see median read and write speeds, minimum and maximum values, and the result of every run. CHECK CONSISTENCY Choose 6 runs to assess read and write stability separately over the last five. See whether results are stable or vary, with the criteria explained in the app. TEST YOUR SETUP Use your iPhone's internal storage or select a compatible, writable external drive through Files. Choose a test file from 1 to 5 GiB and a block size of 1, 2, 4, 8 or 16 MiB. The defaults are 6 runs, a 1 GiB file and a 2 MiB block. UNDERSTAND THE MEASUREMENT Diskio 3.0 reworks the speed calculation and test-file sizing. Speeds are shown in MB/s, and write timing includes final filesystem synchronization. Follow each write and read phase as the test runs. SHARE THE DETAILS Send a result card with the full report, test settings and, after 6 runs, the stability assessment. The redesigned interface supports light and dark appearances, larger text and Reduce Motion. GET STARTED 1. Select your storage and test settings. 2. Start the test and keep Diskio open. 3. Review the report or share your results. A test needs enough free space for a temporary file. External storage must be accessible and writable through Files. Results depend on the device, storage, connection, free space and test settings. The stability assessment adapts numerical criteria from SNIA SSS PTS. It is not a full SNIA-compliant benchmark, a drive-health check or a sustained-performance rating. Measurements in version 3.0 may differ from earlier versions because the method has changed.
Screenshots
Verdict
The clearest difference is price: U8 at Free against Diskio's $5.99. U8 also leads on review sentiment (64% vs 44%) and device support (3 vs 1). Diskio's advantage is in-app purchases (none vs 1) and update cadence (weekly vs every 6 weeks). On rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
U8 is free to download; Diskio costs $5.99 up front. U8 sells 1 one-off in-app purchase. Diskio asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.0 for U8 against 3.9 for Diskio. Both are backed by a comparable volume of ratings — 9 and 17 respectively. Written reviews are what separate them: 64% of U8's written reviews are positive against 44% of Diskio's.
U8 ships an update every 6 weeks, Diskio weekly. The most recent releases landed on September 17, 2026 and September 29, 2026 respectively.
| Parameter | U8 | Diskio |
|---|---|---|
| Price | Free — better | $5.99 |
| Rating | 4.0 (9 ratings) — better | 3.9 (17 ratings) |
| Positive reviews | 64.3% of reviews — better | 44.4% of reviews |
| Number of ratings | 9 | 17 — better |
| Update frequency | Every 6 weeks | Weekly — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 26 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | ErxiangHeyi Information | Sergii Khliustin |
Customer experience
U8
Diskio
In-app purchases
U8
- LifeTime$3.99
Diskio
No in-app purchases









