# Circle & Sphere — All measures, step-by-step

> Geometry calculator for circles and spheres with step-by-step solutions. (iPhone/iPad app by Glindemann, Sennoun, Langer GbR.)

- Source: https://appshunter.io/ios/app/circle-and-sphere/id1564077078 (this page in markdown: same URL + `.md`)
- Developer: [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Rating: 4.00/5 from 4 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 180 MB
- Languages: American English, French (France), German (Germany), Hindi, Indonesian, Japanese, Korean, Brazilian Portuguese, Russian, Chinese (Simplified, China) and 1 more
- Released: 2021-04-21
- Data updated: 2026-08-21
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/circle-and-sphere/id1564077078/reviews.md

## What is Circle & Sphere?

Do your homework instantly. Prepare for exams without stress. Free, complete step-by-step solutions. Enter your values and calculate:
- Circle: radius, diameter, circumference and area  
- Sphere: surface area and volume  
- Circular sector: arc length and central angle  

HOW IT WORKS  
Enter your values in the correct fields and get started. You receive the solution instantly and can share it with friends or classmates.  

YOUR PERSONAL DATA  
We don’t need it. Only anonymized data is collected, for example:  
- which features are used  
- how many solutions are generated  
This helps us improve. We cannot identify you.  

COSTS  
Everything is free to use. 24/7 access to your solutions. All solution steps always remain complete.  
If you need many solutions in a short time, various purchase options are available.  

EXTRAS  
- Overview of all measures  
- all length units  
- curated learning videos  
- feedback for incorrect inputs  
- manage your own solutions  
- app introduction  

CONTACT  
Questions and feedback via Discord or directly in the app review.

## Key features

- Circle calculations (radius, diameter, circumference, area)
- Sphere calculations (surface area, volume)
- Circular sector calculations
- Step-by-step solutions
- Learning videos
- Solution management

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |
| +2 Convenience Tokens / 6h, max. +4 | $0.99 | one-time |
| +4 Convenience Tokens / 6h, max. +8 | $1.59 | one-time |
| +1 Convenience Token / 6h, max. +2 | $0.59 | one-time |
| +30 User Tokens | $0.29 | one-time |
| +300 User Tokens | $1.49 | one-time |
| +150 User Tokens | $0.99 | one-time |
| Lifetime Access | $2.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/circle-and-sphere/id1564077078/reviews.md

### 5/5 — Relativ Okey

*2022-05-21*

Grundlagen Physik die für die Umwelt
Exzellent ausreichend ist

**Developer response:** Vielen Dank für deine positive Bewertung! Bisher hatte ich nur die Körperberechnung als Thema der Mathematik im Blick. Da freut es mich um so mehr, dass es im Physikunterricht ebenfalls nützlich ist!

## Frequently asked questions about Circle & Sphere

### What geometric shapes can Circle & Sphere calculate?

Circle & Sphere can calculate quantities for circles (radius, diameter, circumference, area), spheres (surface area, volume), and circular sectors (arc length, central angle). It provides free, complete step-by-step solutions for these calculations.

### How does Circle & Sphere help with learning?

Circle & Sphere offers curated learning videos and provides detailed step-by-step solutions for each calculation. This aims to help users understand the formulas and processes involved, making exam preparation less stressful.

### Is Circle & Sphere free to use?

Yes, Circle & Sphere is free to use with 24/7 access to all solutions and their steps. However, purchase options are available if you need to generate many solutions in a short period.

### Does Circle & Sphere collect personal data?

No, Circle & Sphere does not require personal data. It only collects anonymized data on feature usage and solution generation to improve the app, and cannot identify individual users.

### What devices is Circle & Sphere available on?

Circle & Sphere is available on iPhone, iPad, and iPod. It is rated for ages 4+.

### How often is Circle & Sphere updated?

The latest version is 3.1.3, last updated on June 3, 2026. This indicates a recent update, suggesting ongoing development and support for the application.

### What is the user rating for Circle & Sphere?

Circle & Sphere has a rating of 4.0 stars from 4 ratings. This suggests generally positive user reception based on the available feedback.

### Does Circle & Sphere have ads?

No, Circle & Sphere does not contain advertisements. The app is free to use, with optional in-app purchases for advanced usage.

## Version history (last 5 releases)

### 3.2.3 — 2026-08-14

The latest release 'Least common multiple' is linked in the menu section now.

Minor performance and UI fixes.

### 3.2.2 — 2026-08-04

- the status bar on top is integrated into the current app design
- the app flow was improved (pop-up information was balanced)

### 3.2.1 — 2026-07-17

Maintenance update. Improving performance.

### 3.2.0 — 2026-06-19

Bringing all apps to the same security standard. Critical storage behaviour for solutions has been fixed.

By the way - I run many apps with different math topics. If you like this one: Check them out as well!

I always do my best to keep a high standard on my apps. If something does not meet the expectations, do not hesitate to contact me.

### 3.1.4 — 2026-06-06

There were some major fixes and adjustments for a more stable behaviour of the solution storage and loading. Therefore some database changes were made in the background. There are no performance losses and the functionality does not change. The background tasks are only done once within milliseconds. Following behaviour may occur (only temporary):
- stored calculations have to be tapped twice to load fully
- the order of the stored solutions may change

If there are some losses of solutions do not hesitate to contact me and tell me the number of lost solutions + affected app. I will find a solution for this.

Kind regards, Alex (the Dev)

## Apps similar to Circle & Sphere

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Geostationary Orbit 3D Lab](https://appshunter.io/ios/app/geostationary-orbit-3d-lab/id1190211000) | — | Free | Education |
| [Birdathon](https://appshunter.io/ios/app/birdathon/id1211977440) | 4.7 (15) | Free | Education |
| [Campus Labs® Event Check-in](https://appshunter.io/ios/app/campus-labs-event-check-in/id1221503400) | 4.8 (1,381) | Free | Education |
| [Uncertainty Calculator](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440) | 5.0 (1) | $3.99 | Education |
| [DoodleConnect](https://appshunter.io/ios/app/doodleconnect/id1176073180) | 4.7 (55) | Free | Education |
| [Solar System Simulator](https://appshunter.io/ios/app/solar-system-simulator/id1190193240) | 2.0 (3) | Free | Education |

## More apps by Glindemann, Sennoun, Langer GbR

- [Pintrs EIGHT](https://appshunter.io/ios/app/pintrs-eight/id1043738177)
- [Pintrs](https://appshunter.io/ios/app/pintrs/id1076171058)
- [2048 Charming Easy](https://appshunter.io/ios/app/2048-charming-easy/id1154480597)
- [Touch shapes in order](https://appshunter.io/ios/app/touch-shapes-in-order/id1185530946)
- [Linear Equations Calculator](https://appshunter.io/ios/app/linear-equations-calculator/id1246761828)
- [Chubby Mojis Animated Sticker](https://appshunter.io/ios/app/chubby-mojis-animated-sticker/id1258233753)

All apps by Glindemann, Sennoun, Langer GbR: https://appshunter.io/developer/1024972809

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*