# Interval Timer vs AER

The clearest difference is in-app purchases: AER at none against Interval Timer's 10. AER also leads on ads (none vs shown) and update cadence (every 5 days vs monthly). Interval Timer's advantage is ratings volume (392 vs 1). On price, rating, review sentiment and device support there is nothing between them.

Both are free to download. Interval Timer sells 10 in-app purchases, starting at $2.09 per month. AER asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Interval Timer against 5.0 for AER. That said, the two scores are not equally well evidenced: Interval Timer has 392 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 97% of Interval Timer's written reviews are positive against 100% of AER's.

Interval Timer ships an update monthly, AER every 5 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Interval Timer | AER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (392 ratings)](https://appshunter.io/ios/app/interval-timer-tabata-and-hiit/id6443672034/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/aer-breath/id6761077610/reviews)** |
| Number of ratings | **392** | 1 |
| Positive reviews | 96.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 112 MB | 17 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SimpleInnovation LLC](https://appshunter.io/developer/1479770962) | [Viktor Danyshchuk](https://appshunter.io/developer/1887661900) |

## What reviewers say

### Interval Timer

[App page](https://appshunter.io/ios/app/interval-timer-tabata-and-hiit/id6443672034)

This app provides a customizable interval timer for various training routines, including HIIT and Tabata. Easily set up custom workouts, track your progress, and stay motivated with visual cues and audio notifications. It's suitable for a wide range of activities from fitness to productivity.

**Highlights:** Customizable workout setup, Progress tracking with calendar, Saveable custom presets, Color-coded notifications, Listen to music/audiobooks, Large, full-screen display, Widget for easy access

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Timer PRO for 1 month: 30% OFF | $2.09 | per month |
| Timer PRO for 1 month: 25% OFF | $2.29 | per month |
| Interval Timer PRO for 1 month | $2.99 | per month |
| Interval Timer PRO for 1 month | $2.99 | per month |
| Interval Timer PRO - 30% OFF | $15.00 | per year |
| Interval Timer PRO for 1 year | $21.99 | per year |
| Tabata Timer PRO for 1 year | $21.99 | per year |
| Interval Timer - no Ads | $2.99 | one-time |
| HIIT Timer PRO Forever 30% OFF | $27.99 | one-time |
| Exercise Timer PRO Forever | $39.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Intuitive interface
- 🔋 Doesn't drain battery
- 💪 Effective for interval training
- 📆 Tracks workout history

**What reviewers complain about**

- 🔔 Frequent prompts to rate the app
- 🔒 Concerns about data privacy and permissions
- 🔧 Limited customization options

**Reported bugs**

- Occasional app crashes
- Compatibility issues with older devices

**Requested features**

- More pre-designed workout routines
- Ability to name and customize exercises
- Option to adjust countdown time between intervals


### 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 free?

Interval 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 or AER?

AER is rated higher. Interval Timer averages 4.9 out of 5 from 392 ratings, while AER averages 5.0 from 1 ratings.

### Do Interval Timer or AER have ads?

Interval Timer shows ads; AER does not.

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

Interval Timer ships an update monthly, and AER every 5 days. Most recently, Interval Timer was updated on November 7, 2026 and AER on October 31, 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.*