a vs ReasonML
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
a
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.
- 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
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a-Shell is a complete local terminal emulator, allowing to run most Unix commands on your iOS device. You can transfer files using scp and curl, edit them with vim and ed, process them using grep, awk and sed. You can work with git repositories using lg2. Most commands are compiled for iOS native Arm64 format, making them fast and well integrated with the BSD Unix that powers iOS/iPadOS. a-Shell includes Python, Lua, Perl, JavaScript, C, C++ for programming and TeX (texlive 2025, with Tikz and LuaTeX) for text processing. There are also multiple network utilities: nslookup, ping, whois, ifconfig... Type help for help, help -l to get the full list of commands. a-Shell can be controlled from Shortcuts: run commands in order, process files in a-Shell, get the results as text or files, transfer files to other apps... a-shell uses iOS 13+ “multiple windows” ability, so you can run multiple shells at the same time, with different commands, in different directories. You can edit a file in one window with vim and process it in the other with python. Compile your C or C++ programs to webAssembly using clang or clang++, and execute the resulting binary. A complete webAssembly SDK is included (WASI-libc). a-Shell is the complete version. If you need a smaller app, and you don't need a C compiler, a TeX engine, or numpy and matplotlib, there is a-Shell mini.
ReasonML
This app serves as a playground for ReasonML, allowing users to convert code between ReasonML and OCaml. It also compiles code to JavaScript and displays the JS console output directly within the application.
- ReasonML to OCaml conversion
- OCaml to ReasonML conversion
- Compile to JavaScript
- View JS console output
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Playground for ReasonML * Convert between ReasonML and OCaml * Compile to JS * View JS console output
Screenshots
Verdict
The clearest difference is monetization model: ReasonML at free against a's paid. ReasonML also leads on update cadence (every 2 days vs monthly) and rating (5.0 vs 4.6). a's advantage is ratings volume (553 vs 3) and chart position (#19 vs unranked). On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ReasonML holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: a has 553 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 79% of a's written reviews are positive against 100% of ReasonML's.
a ships an update monthly, ReasonML every 2 days. The most recent releases landed on September 23, 2026 and September 20, 2026 respectively.
| Parameter | a | ReasonML |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (553 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 78.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 553 — better | 3 |
| Update frequency | Monthly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #19 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 13.4 — better |
| Further details — not scored | ||
| Size | 1.9 GB | 8 MB |
| Age rating | 17+ | 4+ |
| Developer | Nicolas Holzschuch | Jacob Parker |
Customer experience
a
ReasonML
Bugs and requests
a
Reported bugs
3 issues- 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
5 requests- 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
ReasonML
Not enough reviews yet to summarise bugs or requests.
In-app purchases
a
No in-app purchases
ReasonML
No in-app purchases
