# Interval Timer □ HIIT Timer vs AER

The clearest difference is review sentiment: AER at 100% against Interval Timer □ HIIT Timer's 61%. AER also leads on in-app purchases (none vs 5) and update cadence (every 5 days vs every 5 weeks). Interval Timer □ HIIT Timer's advantage is ratings volume (86K vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Interval Timer □ HIIT Timer sells 5 in-app purchases, starting at $1.99 per month. AER asks for nothing beyond the download.

AER holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Interval Timer □ HIIT Timer has 86K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 61% of Interval Timer □ HIIT Timer's written reviews are positive against 100% of AER's.

Interval Timer □ HIIT Timer ships an update every 5 weeks, AER every 5 days. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Interval Timer □ HIIT Timer | AER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (86K ratings)](https://appshunter.io/ios/app/interval-timer-hiit-timer/id1124297113/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/aer-breath/id6761077610/reviews)** |
| Number of ratings | **86K** | 1 |
| Positive reviews | 60.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Monetization | Freemium | **Free** |
| Size | 34 MB | 17 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Float Tech, LLC](https://appshunter.io/developer/483697886) | [Viktor Danyshchuk](https://appshunter.io/developer/1887661900) |

## What reviewers say

### Interval Timer □ HIIT Timer

[App page](https://appshunter.io/ios/app/interval-timer-hiit-timer/id1124297113)

Create custom workout timers with adjustable intervals for exercise and rest.  Track your progress with detailed history and statistics, and repeat past workouts easily.  Enjoy audio cues without interrupting your music.

**Highlights:** Customizable intervals, Workout and rest timers, Voice or beep guides, Background audio support, Workout history and statistics, Repeat previous workouts

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Pass | $1.99 | per month |
| Premium Pass | $2.99 | per month |
| Lifetime Pass | $14.99 | one-time |
| Lifetime Pass | $19.99 | one-time |
| Premium Forever Promo | $29.99 | one-time |

**What reviewers like**

- 🚀 Simple and easy to use
- 👍 Customizable settings
- 🚀 Intuitive interface
- 🚀 Effective for HIIT workouts
- 👍 Helpful voice prompts

**What reviewers complain about**

- 🔒 Requires subscription after limited free use
- 🐛 Music volume issues with voice prompts
- 🐛 Inconsistent behavior when switching apps
- 🐛 Lack of final workout notification

**Reported bugs**

- Timer not always accurate
- Favorites/saved workouts feature not working
- Inconsistent behavior when pausing/resuming

**Requested features**

- Ability to save and name custom workouts
- More flexibility in exercise/rest time settings
- Option to adjust volume of voice prompts


### AER

[App page](https://appshunter.io/ios/app/aer-breath/id6761077610)

This app guides you through breathing exercises for relaxation, focus, and sleep. Follow animated visuals and optional audio cues to achieve calm and clarity.

**Highlights:** Guided breathing sessions, Relaxation techniques, Focus enhancement, Sleep aid, Animated visual guide, Ambient sound options

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

**In-app purchases:** none


## Frequently asked questions

### Is Interval Timer □ HIIT Timer free?

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

### Is AER free?

AER is free to download, with no in-app purchases.

### Which has better reviews, Interval Timer □ HIIT Timer or AER?

AER is rated higher. Interval Timer □ HIIT Timer averages 4.8 out of 5 from 86K ratings, while AER averages 5.0 from 1 ratings.

### Do Interval Timer □ HIIT Timer or AER have ads?

Neither Interval Timer □ HIIT Timer nor AER shows ads.

### Which is updated more often, Interval Timer □ HIIT Timer or AER?

Interval Timer □ HIIT Timer ships an update every 5 weeks, and AER every 5 days. Most recently, Interval Timer □ HIIT Timer was updated on October 15, 2026 and AER on October 2, 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.*