Comparison

a vs Simple Sequence Diagram AI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

Simple Sequence Diagram AI

Features
Read full description

This app allows you to easily create sequence diagrams. Simply describe what you want to visualize, and the latest AI technology will automatically generate a sequence diagram for you. Visualizing information with sequence diagrams is useful for organizing complex processes and interactions. It helps stakeholders understand how systems and processes work, making sequence diagrams valuable in a wide range of situations. However, creating them manually can take time. With this app, you can create sequence diagrams quickly and efficiently. Even if you only provide a rough description of the sequence you want to create, the app can generate a diagram for you. You can also provide more detailed instructions and make adjustments as needed. It can be used in various situations such as: - Visualizing API communication flows in software development - Managing flows from user registration and authentication to service usage - Organizing data transmission and response processes in web services - Managing and visualizing customer support inquiry flows - Designing email and notification system workflows - Visualizing interactions between microservices - Organizing complex approval workflows in business processes - Visualizing user interaction flows in e-commerce systems - Visualizing the process from ordering to delivery in supply chains Please try it whenever you need to create a sequence diagram. [Features] - Intuitive operation Ease of use is important. The app runs smoothly and allows you to edit sequence diagrams intuitively. - Ready to use You can start using the app immediately without creating an account. - Cloud storage support Use cloud storage to save and edit your sequence diagram data across multiple devices. - Export and Share Export and share your sequence diagrams, or use the exported data in other environments. - Import Import exported sequence diagram files and continue editing them. - Text-based editing Edit your sequence diagrams directly using Mermaid notation. - Dark theme support The app supports a dark theme, making it comfortable to use even in low-light environments.

Screenshots

a4 screens
Simple Sequence Diagram AI4 screens

Verdict

The call

The clearest difference is in-app purchases: a at none against Simple Sequence Diagram AI's 2. a also leads on chart position (#18 vs #200). Simple Sequence Diagram AI's advantage is update cadence (every 2 weeks vs monthly). On price, ads, device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Simple Sequence Diagram AI sells 2 in-app purchases, starting at $4.99 per month. a asks for nothing beyond the download.

UpkeepUpdate frequency

a ships an update monthly, Simple Sequence Diagram AI every 2 weeks. The most recent releases landed on October 17, 2026 and October 12, 2026 respectively.

Scorecard3 real differences · 8 level
a versus Simple Sequence Diagram AI: the parameters behind the verdict, then further details
ParameteraSimple Sequence Diagram AI
PriceFreeFree
Rating4.6 (553 ratings) — better—
Positive reviews78.3% of reviews—
Number of ratings553 — better—
Update frequencyMonthlyEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
Best chart rank#18 — better#200
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better15.6
Further details — not scored
Size1.9 GB55 MB
Age rating17+4+
DeveloperNicolas HolzschuchYUKI TANAIKE

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

Simple Sequence Diagram AI

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

a

No in-app purchases

2 purchases

Simple Sequence Diagram AI

Subscriptions2
  • Simple Sequence Flow Pro (Monthly)$4.991 Month
  • Simple Sequence Flow Pro (Annual)$44.991 Year

Questions

Is a free?
a is free to download, with no in-app purchases.
Is Simple Sequence Diagram AI free?
Simple Sequence Diagram AI is free to download, with in-app purchases available.
Do a or Simple Sequence Diagram AI have ads?
Neither a nor Simple Sequence Diagram AI shows ads.
Which is updated more often, a or Simple Sequence Diagram AI?
a ships an update monthly, and Simple Sequence Diagram AI every 2 weeks. Most recently, a was updated on October 17, 2026 and Simple Sequence Diagram AI on October 12, 2026.
Which is more popular, a or Simple Sequence Diagram AI?
a currently peaks at #18 in the App Store charts, and Simple Sequence Diagram AI at #200. Chart position reflects recent download velocity rather than total install base.

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