# Arithmetic HD vs Circle

The clearest difference is update cadence: Arithmetic HD at every 9 months against Circle's every 29 months. Arithmetic HD also leads on iOS requirement (12.1 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Arithmetic HD costs $1.99 and Circle $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Arithmetic HD ships an update every 9 months, Circle every 29 months. The most recent releases landed on September 13, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Arithmetic HD | Circle |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/circle-stay-focused/id1239520314/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 months** | Every 29 months |
| Monetization | — | Paid |
| Size | 17 MB | 1 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kostakov Maxim](https://appshunter.io/developer/524964352) | [Marco Tini](https://appshunter.io/developer/544232459) |

## What reviewers say

### Arithmetic HD

[App page](https://appshunter.io/ios/app/arithmetic-hd/id686967632)

**Features:** macOS Compatibility

**In-app purchases:** none


### Circle

[App page](https://appshunter.io/ios/app/circle-stay-focused/id1239520314)

This app helps you reduce phone usage and increase productivity for work and study. It uses a unique circle-based system to track progress and can detect distractions while you're using your device.

**Highlights:** Reduce phone usage, Increase productivity, Track progress with circles, Detect distractions, Simple and easy to use

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

**In-app purchases:** none


## Frequently asked questions

### Is Arithmetic HD free?

Arithmetic HD costs $1.99, with no in-app purchases.

### Is Circle free?

Circle costs $1.99, with no in-app purchases.

### Do Arithmetic HD or Circle have ads?

Neither Arithmetic HD nor Circle shows ads.

### Which is updated more often, Arithmetic HD or Circle?

Arithmetic HD ships an update every 9 months, and Circle every 29 months. Most recently, Arithmetic HD was updated on September 13, 2026 and Circle on September 23, 2026.

---

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