The spec sheet for a new Android phone lists a storage class (UFS 3.1, UFS 4.0, UFS 4.1) but never a number. A cheap phone can market UFS 3.1 and ship a controller that reads at half the class spec, and only a benchmark will tell the reader. We tested six Android benchmark apps that report sequential and random read-write speeds honestly, without the smoke of a “total score”. These are the best apps for benchmarking Android internal storage speed in 2026.
What to look for in a storage benchmark
- Sequential and random reads and writes reported separately, in MB/s and IOPS.
- Configurable file size, so a test doesn’t fit in the OS page cache.
- Repeat runs. A single number is noise; five runs is a signal.
- No hidden ads or upsell popups during the run, which throttle background work.
- A history log to compare the phone before and after an OS update.
- Cross-platform reference numbers, so the reader can compare against a laptop SSD.
Quick comparison
| App | Best for | Sequential + random | History log | Free |
|---|---|---|---|---|
| AndroBench | The reference benchmark | Yes | Yes | Yes |
| A1 SD Bench | SD card vs internal storage | Yes | Yes | Freemium |
| CPU-Z | Spec + quick storage check | Basic | No | Yes |
| DevCheck | System-wide test suite | Yes | Yes | Freemium |
| AIDA64 | Deep hardware profile | Yes | Yes | Yes |
| PCMark for Android | Real-world storage scenarios | Scenario-based | Yes | Yes |
The 6 best Android storage benchmark apps in 2026
1. AndroBench, the reference
AndroBench is what phone reviewers use. It reports sequential read, sequential write, random read, and random write in MB/s and IOPS, and it lets the reader choose the test file size to defeat cache. The result screen is plain enough to screenshot and post, which is why it lands in most side-by-side reviews.
Where it falls short: UI has not aged. Bundled marketplace links are ignorable.
Pricing: Free.
Platforms: Android 4.1 and later.
Bottom line: Run this first, screenshot, post to the phone-owner subreddit.
2. A1 SD Bench, the internal vs SD comparison
A1 SD Bench is the classic for anyone still using SD cards or USB-OTG drives. It benchmarks internal storage against removable media on the same axes and flags cards that fake their capacity or throttle after a short burst.
Where it falls short: UI is dated. Free tier caps the number of saved runs.
Pricing: Free tier for spot checks. Modest in-app upgrade removes the cap.
Platforms: Android 4.1 and later.
Bottom line: For readers with a phone that still has an SD slot.
3. CPU-Z, the quick spec + storage view
CPU-Z is best known for the CPU tab, but the storage tab reports capacity, filesystem, and a short read-write burst. It is enough for “is this phone the storage class the spec says”, without opening a full benchmark app.
Where it falls short: Not a serious benchmark. No random IOPS.
Pricing: Free.
Platforms: Android 5.0 and later.
Bottom line: For the phone-in-hand quick check before buying a used device.
4. DevCheck, the system-wide suite
DevCheck covers CPU, GPU, memory, sensors, and storage in one report. The storage benchmark measures sequential and random on both internal and external, and the report is exportable.
Where it falls short: The pro upgrade unlocks the sensor logs; the free tier is enough for storage.
Pricing: Free for storage benchmark. Pro upgrade for logging and pro widgets.
Platforms: Android 5.0 and later.
Bottom line: When storage numbers are only part of the question.
5. AIDA64, the deep hardware profile
AIDA64 for Android is a port of the veteran PC diagnostic. It reads the eMMC or UFS controller’s manufacturer and firmware string, which explains why two phones with the same marketing storage class report different speeds.
Where it falls short: No paid tier upsell, but the UI is textbook engineering density.
Pricing: Free.
Platforms: Android 5.0 and later.
Bottom line: For readers who care why the number is that number, not just what the number is.
6. PCMark for Android, the real-world scenario
PCMark does not run raw sequential and random passes. Instead it runs scenarios that mix I/O with CPU work: photo editing, video editing, data manipulation. The result is closer to what “fast” feels like day to day.
Where it falls short: Long runs. Not the tool for a spec check.
Pricing: Free.
Platforms: Android 8.0 and later.
Bottom line: Best “does this actually feel fast” answer on the list.
How to pick the right one
- Default reference for storage numbers: AndroBench.
- For SD or USB drives: A1 SD Bench.
- For a quick check without a real benchmark: CPU-Z or AIDA64.
- For a broader system profile: DevCheck.
- For real-world feel rather than sequential MB/s: PCMark.
FAQ
How do I tell if my phone is UFS 3.1 or UFS 4.0?
Run AIDA64 and check the storage controller string, or read AndroBench sequential-read scores against class references.
Are these benchmarks accurate on an encrypted phone?
Yes. File-based encryption is negligible overhead. Full-disk encryption is deprecated.
Why does my new phone benchmark slower than my old one?
Thermal throttling, background sync during the run, or a cheaper storage controller behind the same marketing class. Reboot, retest, and compare.
Which app is best for spotting fake SD cards?
A1 SD Bench flags cards whose write burst collapses after the on-card cache fills.
