# a vs Cognitive Physics

The clearest difference is monetization model: Cognitive Physics at free against a's paid. Cognitive Physics also leads on rating (5.0 vs 4.6). a's advantage is ratings volume (553 vs 2) and chart position (#18 vs unranked). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Cognitive Physics 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 2, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | a | Cognitive Physics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (553 ratings)](https://appshunter.io/ios/app/a-shell/id1473805438/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/cognitive-physics/id6758934425/reviews)** |
| Number of ratings | **553** | 2 |
| Positive reviews | 78.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Paid | **Free** |
| Best chart rank | **#18** | — |
| Size | 1.9 GB | 142 MB |
| Requires iOS | **14.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Nicolas Holzschuch](https://appshunter.io/developer/1450994948) | [Joel Pena Munoz](https://appshunter.io/developer/1830887193) |

## What reviewers say

### a

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

**Currently charting:** #18 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


### Cognitive Physics

[App page](https://appshunter.io/ios/app/cognitive-physics/id6758934425)

This app transforms your device into a truth-seeking instrument by training a personal AI to research alongside you. It guides you to ask better questions, verify claims, and build a permanent knowledge base from your imported materials. Designed for serious workflows, it focuses on observable learning processes rather than just providing answers.

**Highlights:** Train your own AI from scratch, Research like a scientist, Ask questions with citations, Build a permanent knowledge base, Multi-agent intelligence, Automatic paper generation

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

**In-app purchases:** none


## Frequently asked questions

### Is a free?

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

### Is Cognitive Physics free?

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

### Which has better reviews, a or Cognitive Physics?

Cognitive Physics is rated higher. a averages 4.6 out of 5 from 553 ratings, while Cognitive Physics averages 5.0 from 2 ratings.

### Do a or Cognitive Physics have ads?

Neither a nor Cognitive Physics shows ads.

### Which is updated more often, a or Cognitive Physics?

a ships an update monthly, and Cognitive Physics monthly. Most recently, a was updated on October 12, 2026 and Cognitive Physics on October 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*