# CircleMap vs ShellRef

The clearest difference is price: CircleMap at Free against ShellRef's $0.99. CircleMap also leads on update cadence (daily vs every 3 weeks). ShellRef's advantage is rating (5.0 vs 4.5). On ratings volume, ads, in-app purchases and device support there is nothing between them.

CircleMap is free to download; ShellRef costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ShellRef holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

CircleMap ships an update daily, ShellRef every 3 weeks. The most recent releases landed on October 14, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | CircleMap | ShellRef |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/circlemap/id6749683203/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/shellref/id6759814118/reviews)** |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 weeks |
| Monetization | **Free** | Paid |
| Size | 29 MB | 19 MB |
| Requires iOS | **16.6** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Supparsorn Wantarnagon](https://appshunter.io/developer/1800705021) | [Andrew Bacon](https://appshunter.io/developer/1817531814) |

## What reviewers say

### CircleMap

[App page](https://appshunter.io/ios/app/circlemap/id6749683203)

This app makes learning the unit circle and polar graphs interactive and fun. It offers customizable quizzes for angles, radians, and coordinates, along with a mode to visualize polar equations in both polar and Cartesian systems. It's designed to build confidence and speed in trigonometry and calculus.

**Highlights:** Interactive unit circle quizzes, Customizable angle and radian practice, Polar equation input and graphing, Dual polar and Cartesian visualization, Real-time graph exploration, Instant feedback and score tracking

**In-app purchases:** none


### ShellRef

[App page](https://appshunter.io/ios/app/shellref/id6759814118)

This app provides an offline reference for Bash, Zsh, and terminal editors, mimicking a retro technical manual. It's ideal for quickly looking up commands, syntax, and scripting practices without needing an internet connection. Features include search, bookmarks, and customizable display themes.

**Highlights:** Offline Bash and Zsh reference, Terminal editor guides (Nano, Vim, Emacs), Quick command lookup, Searchable content, Customizable themes, Adjustable text size, Bookmarks

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CircleMap free?

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

### Is ShellRef free?

ShellRef costs $0.99, with no in-app purchases.

### Which has better reviews, CircleMap or ShellRef?

ShellRef is rated higher. CircleMap averages 4.5 out of 5 from 2 ratings, while ShellRef averages 5.0 from 1 ratings.

### Do CircleMap or ShellRef have ads?

Neither CircleMap nor ShellRef shows ads.

### Which is updated more often, CircleMap or ShellRef?

CircleMap ships an update daily, and ShellRef every 3 weeks. Most recently, CircleMap was updated on October 14, 2026 and ShellRef on October 19, 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.*