# a vs SchemaHD

The clearest difference is rating: a at 4.6 against SchemaHD's 3.0. a also leads on in-app purchases (none vs 7) and review sentiment (78% vs 50%). SchemaHD's advantage is update cadence (every 10 days vs monthly). On price, ads and iOS requirement there is nothing between them.

Both are free to download. SchemaHD sells 7 one-off in-app purchases. a asks for nothing beyond the download.

a holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: a has 553 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 78% of a's written reviews are positive against 50% of SchemaHD's.

a ships an update monthly, SchemaHD every 10 days. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | a | SchemaHD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (553 ratings)](https://appshunter.io/ios/app/a-shell/id1473805438/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/schemahd/id1578851758/reviews) |
| Number of ratings | **553** | 2 |
| Positive reviews | **78.3% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | Paid | **Free** |
| Best chart rank | **#20** | — |
| Size | 1.9 GB | 2 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 17+ | 4+ |
| Developer | [Nicolas Holzschuch](https://appshunter.io/developer/1450994948) | [Yasuaki Iwasaki](https://appshunter.io/developer/560857505) |

## What reviewers say

### a

[App page](https://appshunter.io/ios/app/a-shell/id1473805438)

**Currently charting:** #20 Top Free · Developer Tools (US App Store)

Run a full Unix-like terminal environment on your iOS device. Execute a wide range of commands, edit files, and even program using included interpreters and compilers. Supports multitasking and integration with Shortcuts.

**Highlights:** Local Unix terminal emulator, SSH client, File transfer (scp, curl), Text editing (vim, ed), Scripting languages (Python, Lua, Perl, JS), C/C++ compiler, TeX distribution

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Powerful terminal with Linux commands
- 👍 Useful for programming and development
- 🔒 Secure and reliable
- 💡 Impressive capabilities for an iOS app
- 👍 Helpful documentation and developer support

**What reviewers complain about**

- 🐛 Occasional crashes and bugs
- 🔍 Limited customization options
- 🔍 Missing some basic terminal features
- 🔍 Compatibility issues with certain packages

**Reported bugs**

- Toolbar buttons not accessible in portrait mode on some devices
- Pasting from clipboard can insert unexpected characters
- Sourcing certain script files causes crashes

**Requested features**

- Add support for package managers like Homebrew or APT
- Implement more advanced shell features like job control and better tab completion
- Integrate Git for version control
- Allow installing additional packages and libraries
- Improve clipboard and file management integration


### SchemaHD

[App page](https://appshunter.io/ios/app/schemahd/id1578851758)

This app allows users to draw circuit diagrams for logic circuits, generating Verilog HDL and performing simulations. It simplifies FPGA development by using schematics instead of complex programming languages, offering advanced security and high-performance parallel processing.

**Highlights:** Draw logic circuit diagrams, Generate Verilog HDL, Perform circuit simulations, Touch-based wiring, AXI bus interface support, JSON import/export, Offline network operation

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Give a tip #1 | $1.99 | one-time |
| Give a tip #2 | $3.99 | one-time |
| Give a tip #3 | $7.99 | one-time |
| Give a tip #4 | $15.99 | one-time |
| Give a tip #5 | $23.99 | one-time |
| Give a tip #6 | $39.99 | one-time |
| Give a tip #7 | $79.99 | one-time |


## Frequently asked questions

### Is a free?

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

### Is SchemaHD free?

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

### Which has better reviews, a or SchemaHD?

a is rated higher. a averages 4.6 out of 5 from 553 ratings, while SchemaHD averages 3.0 from 2 ratings.

### Do a or SchemaHD have ads?

Neither a nor SchemaHD shows ads.

### Which is updated more often, a or SchemaHD?

a ships an update monthly, and SchemaHD every 10 days. Most recently, a was updated on October 19, 2026 and SchemaHD on October 10, 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.*