ISN NFS vs Diskio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ISN NFS
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The BeringWatch Sentinel Harvest app is for trained community-based observers and local and traditional knowledge holders to record data during subsistence harvest activities conducted in their local communities. The BeringWatch Sentinel Community-Based Monitoring Network which includes the Harvest app was designed and refined over the past 15 years in Alaskan Native communities. Users of the BeringWatch Sentinel apps are located primarily in remote communities that are affected by a rapidly changing environment. The strength of the BeringWatch environmental data collection framework is that it is tribally-driven. Communities are better able to actively participate and lead data collection that both addresses community concerns and contributes meaningful scientific data to researchers, resource managers, and decision makers. BeringWatch Community-Based Sentinel Monitoring Programs are established using observation protocols and standardized methodologies for community-based recording of observations of wildlife, subsistence species and environmental phenomena at locations surrounding participating communities. These data, if collected in a repeatable and consistent manner over a long period of time, can provide valuable ecological reference points for the region. For information on joining the BeringWatch Sentinel Network please contact the Aleut Community of St. Paul Tribal Government.
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: ISN NFS at Free against Diskio's $5.99. ISN NFS also leads on ads (none vs shown) and device support (3 vs 1). Diskio's advantage is update cadence (weekly vs every 14 months). On in-app purchases and iOS requirement 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
ISN NFS is free to download; Diskio costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
ISN NFS ships an update every 14 months, Diskio weekly. The most recent releases landed on September 25, 2026 and September 29, 2026 respectively.
| Parameter | ISN NFS | Diskio |
|---|---|---|
| Price | Free — better | $5.99 |
| Rating | — | 3.9 (17 ratings) — better |
| Positive reviews | — | 44.4% of reviews |
| Number of ratings | — | 17 — better |
| Update frequency | Every 14 months | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 6 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Aleut Community of St. Paul Island Tribal Government | Sergii Khliustin |
In-app purchases
ISN NFS
No in-app purchases
Diskio
No in-app purchases









