# TRIO: Tabata & HIIT Timer — Interval timer you can read

> Interval timer you can read (iPhone/iPad app by Kazuto Kato.)

- Source: https://appshunter.io/ios/app/trio-tabata-and-hiit-timer/id6821620555 (this page in markdown: same URL + `.md`)
- Developer: [Kazuto Kato](https://appshunter.io/developer/6779080556)
- Category: Health & Fitness, Sports
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 23 MB
- Languages: American English, Japanese
- Released: 2026-10-16
- Data updated: 2026-10-24

## What is TRIO?

A Tabata & HIIT timer you can read from across the room.

THREE CIRCLES THAT SWAP
READY, WORK and REST are circles. The current one sits big in the center and smoothly swaps places when the next phase begins. During a workout the whole screen takes on that phase's color, so you know where you are at a glance.

VOICE COUNTDOWN
A voice counts down the last seconds of each phase — "five, four, three…". Choose when it starts (OFF, 3, 5 or 10). Your music keeps playing and only dips while the voice speaks.

SCREEN STAYS ON
By default the screen stays on during workouts. If you lock your phone, the remaining seconds show on the Lock Screen and in the Dynamic Island.

EVERY DAY YOU TRAIN COUNTS
Finish a workout and the day is logged — no typing. Your color deepens every 30 days, and you earn crowns: bronze at 365 days, silver at 730, gold at 1,095. See it on a Home Screen widget. Your days move to a new iPhone with iCloud.

SIMPLE SETUP
Tap a circle to set seconds, then press play. Rounds, total time and finish time are shown. Tap the center circle to pause; hold the stop button to end.

SIX THEMES
MIDNIGHT and DAYLIGHT are free. AURORA, EMBER, LILAC and OCEAN come with the one-time purchase.

NO SUBSCRIPTION
Free to use with a small banner on the start screen (never during workouts). One small purchase removes ads and unlocks 4 themes.

Contact: aziitti110@gmail.com

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| No ads + 4 themes | $1.99 | one-time |


## Is TRIO safe?

Not enough ratings yet to assess TRIO.

## Is TRIO legit?

TRIO: Tabata & HIIT Timer has limited verification signals. The AppsHunter Legitimacy Score for TRIO is 50 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.0.2 — 2026-10-24

Smoother screen while the countdown voice plays. A voice now says "Start workout" when work begins, "Interval" when the rest begins, and "Workout complete" at the end. The voice is softer and your music volume stays the same.

### 1.0.1 — 2026-10-19

You can now leave a review on the App Store from Settings. Minor improvements.

### 1.0.0 — 2026-10-16

No release notes.

## More apps by Kazuto Kato

- [稼ぐ力](https://appshunter.io/ios/app/id6779080553)
- [ひとめも](https://appshunter.io/ios/app/id6781561646)
- [アイデアノート](https://appshunter.io/ios/app/id6781579806)
- [たびこれ](https://appshunter.io/ios/app/id6808026170)
- [ケミドロップ](https://appshunter.io/ios/app/id6815254716)
- [カードポケット - 診察券・カード管理](https://appshunter.io/ios/app/id6819304144)

All apps by Kazuto Kato: https://appshunter.io/developer/6779080556

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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 2026-10-24.*