# Deep Focus Timer ∞ vs 大眼错题本

The clearest difference is ads: 大眼错题本 at none against Deep Focus Timer ∞'s shown. 大眼错题本 also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.6). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Deep Focus Timer ∞ ships an update every 3 months, 大眼错题本 every 5 months. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Deep Focus Timer ∞ | 大眼错题本 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/deep-focus-timer/id6739162439/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Ad-supported | — |
| Size | 16 MB | 38 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [辰巳家有限公司](https://appshunter.io/developer/1781943256) | [自强 侯](https://appshunter.io/developer/1836935055) |

## What reviewers say

### Deep Focus Timer ∞

[App page](https://appshunter.io/ios/app/deep-focus-timer/id6739162439)

A minimalist, full-screen countdown timer designed to eliminate distractions. Set custom durations, start with one tap, and focus on your task with a clean visual display and customizable alarms. Ideal for studying, work sessions, or any activity requiring focused time.

**Highlights:** One-tap start with custom durations, Full-screen visual countdown, Screen stays awake during sessions, Multiple completion tones, Minimal, dark-mode-first interface

**Features:** macOS Compatibility

**In-app purchases:** none


### 大眼错题本

[App page](https://appshunter.io/ios/app/id6754898444)

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

**In-app purchases:** none


## Frequently asked questions

### Is Deep Focus Timer ∞ free?

Deep Focus Timer ∞ is free to download, with no in-app purchases.

### Is 大眼错题本 free?

大眼错题本 is free to download, with no in-app purchases.

### Do Deep Focus Timer ∞ or 大眼错题本 have ads?

Deep Focus Timer ∞ shows ads; 大眼错题本 does not.

### Which is updated more often, Deep Focus Timer ∞ or 大眼错题本?

Deep Focus Timer ∞ ships an update every 3 months, and 大眼错题本 every 5 months. Most recently, Deep Focus Timer ∞ was updated on October 10, 2026 and 大眼错题本 on October 13, 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.*