# Interval Randomizer: HIIT — Dynamic HIIT & Boxing Timer

> Dynamic HIIT & Boxing Timer (iPhone/iPad app by Hitfire Production AB.)

- Source: https://appshunter.io/ios/app/interval-randomizer-hiit/id6742220783 (this page in markdown: same URL + `.md`)
- Developer: [Hitfire Production AB](https://appshunter.io/developer/1517601288)
- Category: Health & Fitness, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 18.2 · 6 MB
- Languages: English
- Released: 2025-02-23
- Data updated: 2026-10-06
- User reviews in markdown: https://appshunter.io/ios/app/interval-randomizer-hiit/id6742220783/reviews.md

## What is Interval Randomizer?

Train without falling into a predictable rhythm.

Interval Randomizer creates changing work intervals inside the minimum and maximum range you choose. Set your timing, recovery and workout duration, then let every round develop differently.

RANDOMIZED TRAINING
- Random work intervals inside your selected range
- Adjustable minimum and maximum work time
- Custom recovery periods
- Configurable total workout duration
- Large live timer with clear work and recovery phases

BUILT FOR SERIOUS TRAINING
- HIIT workouts
- Boxing and combat sports
- Tabata sessions
- MMA and martial arts conditioning
- Sparring drills
- Cardio and reaction training

STAY CONSISTENT
- Daily Challenges
- Training streaks
- XP and levels
- Coins and rewards
- Session statistics
- Training-minute tracking
- Save your favorite workout setups

FAST DURING A WORKOUT
The main controls stay visible so you can change your workout without digging through menus. Clear colors identify work, recovery, timing and progress at a glance.

MADE FOR IPHONE AND IPAD
Interval Randomizer includes dedicated layouts for iPhone and iPad, giving each device the space and controls appropriate for training.

The core timer and Daily Challenges are free. Optional advertising supports continued development, with an available upgrade to remove ads.


## Version history (last 5 releases)

### 1.17 — 2026-09-18

A major Interval Randomizer update:

- Redesigned training-focused interface
- Dedicated iPad layout
- Daily Challenges and training streaks
- XP, levels and coins
- Saved workout library
- Training stats and progress tracking
- Optional rewarded bonuses
- Improved ad pacing
- New app icon
- Timer generation and progress fixes

### 1.16 — 2026-07-25

Bug fixes and improvements

### 1.15 — 2026-06-29

Bug fixes and improvements

### 1.14 — 2026-05-25

Bug fixes and improvements

### 1.13 — 2025-03-28

Bugfixes and improvements.

## Apps similar to Interval Randomizer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Random Beeper timer](https://appshunter.io/ios/app/random-beeper-timer/id6752573970) | 5.0 (2) | Free | Health & Fitness |
| [PB Intervals](https://appshunter.io/ios/app/pb-intervals/id6723896953) | — | Free | Health & Fitness |
| [Reaction Timer Training](https://appshunter.io/ios/app/reaction-timer-training/id1512744673) | 2.3 (4) | Free | Health & Fitness |
| [Re:Do Workouts](https://appshunter.io/ios/app/redo-workouts/id6758432516) | — | Free | Health & Fitness |
| [Smart Trainer app](https://appshunter.io/ios/app/smart-trainer-app/id6747401793) | — | Free | Health & Fitness |
| [WOD Randomiser: HIIT Training](https://appshunter.io/ios/app/wod-randomiser-hiit-training/id912290965) | 4.1 (67) | Free | Health & Fitness |

## More apps by Hitfire Production AB

- [Run & Jump - The rush](https://appshunter.io/ios/app/run-and-jump-the-rush/id1426239923)
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- [DJ Music Producer - Groove Pad](https://appshunter.io/ios/app/dj-music-producer-groove-pad/id1666769300)
- [K-Pop Stage](https://appshunter.io/ios/app/k-pop-stage/id6446216806)
- [DJ Jam Producer - Groove pad](https://appshunter.io/ios/app/dj-jam-producer-groove-pad/id6446253839)

All apps by Hitfire Production AB: https://appshunter.io/developer/1517601288

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-06.*