# CalcTriangle vs USB Disk

The clearest difference is in-app purchases: CalcTriangle at none against USB Disk's 10. CalcTriangle also leads on ads (none vs shown) and chart position (#194 vs unranked). USB Disk's advantage is review sentiment (71% vs 50%) and update cadence (every 3 months vs every 8 months). On price there is nothing between them.

CalcTriangle costs $0.99 and USB Disk $0.99 up front. USB Disk sells 10 in-app purchases, starting at $4.99 per month. CalcTriangle asks for nothing beyond the download.

CalcTriangle ships an update every 8 months, USB Disk every 3 months. The most recent releases landed on July 25, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | CalcTriangle | USB Disk |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | — | **[4.6 (160 ratings)](https://appshunter.io/ios/app/usb-disk/id385275533/reviews)** |
| Number of ratings | — | **160** |
| Positive reviews | 50.0% of reviews | **70.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 3 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#194** | — |
| Size | 1 MB | 170 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Philip Sacchitella](https://appshunter.io/developer/362109165) | [Imesart S.a.r.l.](https://appshunter.io/developer/290160983) |

## What reviewers say

### CalcTriangle

[App page](https://appshunter.io/ios/app/calctriangle/id362109162)

**Currently charting:** #194 Top Paid · Productivity (US App Store)

This app calculates all unknown sides, angles, area, and perimeter of a right triangle. It supports both imperial and metric units, with precise input options for fractions and measurements.

**Highlights:** Calculates sides, angles, area, and perimeter, Supports imperial (feet, inches, fractions) and metric units, Precise fraction input, Save and load triangle data, Simple interface for job sites

**Features:** macOS Compatibility

**In-app purchases:** none


### USB Disk

[App page](https://appshunter.io/ios/app/usb-disk/id385275533)

Manage and view documents on your iPhone or iPad with this intuitive file manager. Access cloud storage, open various file types, and transfer files via iTunes. Advanced features like photo library access and PDF annotation are available via subscription.

**Highlights:** Cloud storage integration (Dropbox, Google Drive, OneDrive, Box), Built-in document viewer for various file types, File transfer via iTunes, Create and open zip files, Swipe navigation and file previews, Email documents and download attachments

**Features:** macOS Compatibility, Family Sharing, Apple Watch app

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| USB Disk Pro Monthly | $4.99 | per month |
| Audio Player + | $0.99 | one-time |
| Zip files support | $0.99 | one-time |
| Dropbox access | $0.99 | one-time |
| Lock code | $0.99 | one-time |
| Text editor | $0.99 | one-time |
| Evernote access | $0.99 | one-time |
| Google Drive access | $0.99 | one-time |
| OneDrive access | $0.99 | one-time |
| WebDAV access | $1.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Efficient file management
- 💡 Useful for storing and accessing documents
- 👍 Convenient for transferring files between devices

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 💰 Expensive paid features
- 🔒 Concerns about security and privacy
- 🤔 Misleading app description

**Reported bugs**

- Inability to open certain file types
- Compatibility issues with newer iOS versions
- Syncing problems between devices

**Requested features**

- Support for more file types
- Improved integration with cloud storage services
- Ability to edit and annotate files
- Better organization and folder management


## Frequently asked questions

### Is CalcTriangle free?

CalcTriangle costs $0.99, with no in-app purchases.

### Is USB Disk free?

USB Disk costs $0.99, and also offers in-app purchases.

### Do CalcTriangle or USB Disk have ads?

USB Disk shows ads; CalcTriangle does not.

### Which is updated more often, CalcTriangle or USB Disk?

CalcTriangle ships an update every 8 months, and USB Disk every 3 months. Most recently, CalcTriangle was updated on July 25, 2026 and USB Disk on October 1, 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.*