# Circle and Sphere Pro vs DK汽车知识库

The clearest difference is update cadence: Circle and Sphere Pro at monthly against DK汽车知识库's every 3 months. Circle and Sphere Pro also leads on iOS requirement (15.0 vs 17.0). DK汽车知识库's advantage is price ($0.99 vs $2.99). On ads, in-app purchases and device support there is nothing between them.

Circle and Sphere Pro costs $2.99 and DK汽车知识库 $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Circle and Sphere Pro ships an update monthly, DK汽车知识库 every 3 months. The most recent releases landed on October 9, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Circle and Sphere Pro | DK汽车知识库 |
| --- | --- | --- |
| Price | $2.99 | **$0.99** |
| Rating | **[4.9 (7 ratings)](https://appshunter.io/ios/app/circle-and-sphere-pro/id1564077280/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | Free | — |
| Size | 180 MB | 7 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [龙 王](https://appshunter.io/developer/1889120838) |

## What reviewers say

### Circle and Sphere Pro

[App page](https://appshunter.io/ios/app/circle-and-sphere-pro/id1564077280)

This app calculates various geometric quantities for circles and spheres, including sectors and segments. It supports decimals and fractions, displays formulas and solutions step-by-step, and stores calculations in a history. Users can share their results.

**Highlights:** Calculates sphere and circle quantities, Supports sectors and segments, Shows formulas and step-by-step solutions, Handles decimals and fractions, Stores calculations in history, Allows sharing of results

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

**In-app purchases:** none


### DK汽车知识库

[App page](https://appshunter.io/ios/app/dk/id6770294691)

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

**In-app purchases:** none


## Frequently asked questions

### Is Circle and Sphere Pro free?

Circle and Sphere Pro costs $2.99, with no in-app purchases.

### Is DK汽车知识库 free?

DK汽车知识库 costs $0.99, with no in-app purchases.

### Do Circle and Sphere Pro or DK汽车知识库 have ads?

Neither Circle and Sphere Pro nor DK汽车知识库 shows ads.

### Which is updated more often, Circle and Sphere Pro or DK汽车知识库?

Circle and Sphere Pro ships an update monthly, and DK汽车知识库 every 3 months. Most recently, Circle and Sphere Pro was updated on October 9, 2026 and DK汽车知识库 on October 8, 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.*