# a vs O

The clearest difference is in-app purchases: a at none against O's 25. a also leads on ads (none vs shown) and review sentiment (78% vs 63%). O's advantage is ratings volume (8.6K vs 553) and chart position (#6 vs #21). On price, rating, update cadence and device support there is nothing between them.

Both are free to download. O sells 23 one-off in-app purchases. a asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for a against 4.5 for O. That said, the two scores are not equally well evidenced: O has 8.6K ratings behind it against 553, so its average is the more settled of the two. Written reviews are what separate them: 78% of a's written reviews are positive against 63% of O's.

a ships an update monthly, O fortnightly. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | a | O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (553 ratings)](https://appshunter.io/ios/app/a-shell/id1473805438/reviews)** | [4.5 (8.6K ratings)](https://appshunter.io/ios/app/o-kam-pro/id1602054864/reviews) |
| Number of ratings | 553 | **8.6K** |
| Positive reviews | **78.3% of reviews** | 62.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | #21 | **#6** |
| Size | 1.9 GB | 366 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Nicolas Holzschuch](https://appshunter.io/developer/1450994948) | [Shenzhen VeePai IoT Intelligent Technology LLC](https://appshunter.io/developer/557459166) |

## What reviewers say

### a

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

**Currently charting:** #21 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


### O

[App page](https://appshunter.io/ios/app/o-kam-pro/id1602054864)

**Currently charting:** #6 Top Free · Developer Tools, #22 Top Grossing · Developer Tools (US App Store)

Monitor your home remotely with real-time video surveillance. Access cloud storage, receive alarm notifications, and communicate via two-way audio. Capture photos and videos for convenient home management.

**Highlights:** Real-time video monitoring, Cloud storage playback, Alarm push notifications, Two-way voice intercom, Photo and video capture, Simple operation and design

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

**In-app purchases (23)**

| Purchase | Price | Billing |
| --- | --- | --- |
| monthly card-7(SA tryout) | $0.99 | one-time |
| monthly card-7(tryout) | $0.99 | one-time |
| monthly card-7(EU tryout) | $0.99 | one-time |
| monthly card-7(JP tryout) | $0.99 | one-time |
| monthly card-7(AE tryout) | $0.99 | one-time |
| monthly card | $1.99 | one-time |
| monthly card | $2.99 | one-time |
| monthly card(JP)-7 | $2.99 | one-time |
| monthly card- 7 | $3.99 | one-time |
| monthly card- 30 | $4.99 | one-time |
| monthly card | $5.99 | one-time |
| monthly card(JP)- 30 | $5.99 | one-time |
| monthly card(SA)- 30 | $5.99 | one-time |
| half year card | $6.99 | one-time |
| monthly card(AE)-30 | $7.99 | one-time |
| yearly card | $12.99 | one-time |
| half year card | $14.99 | one-time |
| yearly card | $24.99 | one-time |
| half year card -7 | $28.99 | one-time |
| half year card | $31.99 | one-time |
| yearly card | $49.99 | one-time |
| yearly card - 7 | $49.99 | one-time |
| half year card -30 | $74.99 | one-time |

**What reviewers like**

- 🚀 Convenient
- 🚀 Easy to use
- 🚀 Great picture quality
- 🚀 Excellent value
- 🚀 Reliable

**What reviewers complain about**

- 🐛 Connectivity issues
- 🐛 Unreliable motion detection
- 🔋 Battery life concerns
- 🔍 Difficult to navigate app
- 💸 Expensive subscription

**Reported bugs**

- Frequent app crashes
- Inability to view recorded footage
- Inconsistent camera performance after updates

**Requested features**

- Easier cloud storage management
- Improved motion detection sensitivity
- More customization options
- Ability to disable microphone/speakers
- Smoother app performance


## Frequently asked questions

### Is a free?

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

### Is O free?

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

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

a is rated higher. a averages 4.6 out of 5 from 553 ratings, while O averages 4.5 from 8.6K ratings.

### Do a or O have ads?

O shows ads; a does not.

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

a ships an update monthly, and O fortnightly. Most recently, a was updated on October 17, 2026 and O on October 19, 2026.

### Which is more popular, a or O?

a currently peaks at #21 in the App Store charts, and O at #6. Chart position reflects recent download velocity rather than total install base.

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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.*