# MirrorUp21 vs Boxing Interval Timer

The clearest difference is price: Boxing Interval Timer at Free against MirrorUp21's $1.99. Boxing Interval Timer also leads on review sentiment (100% vs 88%). MirrorUp21's advantage is in-app purchases (none vs 3). On rating, ratings volume, update cadence and ads there is nothing between them.

Boxing Interval Timer is free to download; MirrorUp21 costs $1.99 up front. Boxing Interval Timer sells 3 in-app purchases, starting at $0.59 per 7 days. MirrorUp21 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for MirrorUp21 against 5.0 for Boxing Interval Timer. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews are what separate them: 88% of MirrorUp21's written reviews are positive against 100% of Boxing Interval Timer's.

MirrorUp21 ships an update every 9 days, Boxing Interval Timer every 6 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | MirrorUp21 | Boxing Interval Timer |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/mirrorup21-21-day-mirror-work/id6740788231/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/boxing-interval-timer-boxiit/id6742499744/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | 87.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 6 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 62 MB | 49 MB |
| Requires iOS | **16.6** | 17.2 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [MindPower(HongKong) Limited](https://appshunter.io/developer/1722726836) | [Bethurel Griffin](https://appshunter.io/developer/912137739) |

## What reviewers say

### MirrorUp21

[App page](https://appshunter.io/ios/app/mirrorup21-21-day-mirror-work/id6740788231)

This app guides you through a 21-day mirror work program using AI to create personalized daily tasks. It helps improve self-acceptance, reduce anxiety, and enhance emotional well-being through positive affirmations and guided exercises. Practice anytime, anywhere with real-time feedback and secure, private data storage.

**Highlights:** AI-powered personalized 21-day plans, Daily guided mirror exercises, Real-time voice feedback, Intelligent completion tracking, Zero registration and local data storage, TouchID/FaceID security locks

**In-app purchases:** none


### Boxing Interval Timer

[App page](https://appshunter.io/ios/app/boxing-interval-timer-boxiit/id6742499744)

This interval timer app is optimized for background operation, ensuring your workout sounds continue even when your device is locked. It offers customizable workouts, round bells, and live activity integration for a seamless training experience.

**Highlights:** Background operation, Round bell and clapper sounds, Live Activities integration, Customizable workouts, Dual progress bars, Dark and light modes

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Save workout, Live Activities | $0.59 | per 7 days |
| Save workout, Live Activities | $29.99 | per year |
| Save workouts, Live Activities | $39.99 | one-time |


## Frequently asked questions

### Is MirrorUp21 free?

MirrorUp21 costs $1.99, with no in-app purchases.

### Is Boxing Interval Timer free?

Boxing Interval Timer is free to download, with in-app purchases available.

### Which has better reviews, MirrorUp21 or Boxing Interval Timer?

MirrorUp21 and Boxing Interval Timer are both rated 5.0 out of 5 on the App Store, from 2 and 3 ratings respectively.

### Do MirrorUp21 or Boxing Interval Timer have ads?

Neither MirrorUp21 nor Boxing Interval Timer shows ads.

### Which is updated more often, MirrorUp21 or Boxing Interval Timer?

MirrorUp21 ships an update every 9 days, and Boxing Interval Timer every 6 days. Most recently, MirrorUp21 was updated on November 4, 2026 and Boxing Interval Timer on October 30, 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.*