# Warmup HIIT Interval Timer vs Sinira

The clearest difference is in-app purchases: Sinira at none against Warmup HIIT Interval Timer's 3. Sinira also leads on ads (none vs shown). Warmup HIIT Interval Timer's advantage is update cadence (every 8 days vs every 16 months) and device support (3 vs 1). On price there is nothing between them.

Both are free to download. Warmup HIIT Interval Timer sells 3 one-off in-app purchases. Sinira asks for nothing beyond the download.

Warmup HIIT Interval Timer ships an update every 8 days, Sinira every 16 months. The most recent releases landed on June 4, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Warmup HIIT Interval Timer | Sinira |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 8 days** | Every 16 months |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 6 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Whizbang](https://appshunter.io/developer/478553656) | [KARIN PIETRUSKA](https://appshunter.io/developer/1807527048) |

## What reviewers say

### Warmup HIIT Interval Timer

[App page](https://appshunter.io/ios/app/warmup-hiit-interval-timer/id1509032368)

This application provides a free, simple interval timer for HIIT workouts and a countdown timer. It also features a quick workout mode that generates daily exercise challenges.

**Highlights:** HIIT interval timer, Countdown timer, Quick workout feature, Daily exercise challenges, Simple and easy to use

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $5.99 | one-time |


### Sinira

[App page](https://appshunter.io/ios/app/sinira/id6744404857)

**In-app purchases:** none


## Frequently asked questions

### Is Warmup HIIT Interval Timer free?

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

### Is Sinira free?

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

### Do Warmup HIIT Interval Timer or Sinira have ads?

Warmup HIIT Interval Timer shows ads; Sinira does not.

### Which is updated more often, Warmup HIIT Interval Timer or Sinira?

Warmup HIIT Interval Timer ships an update every 8 days, and Sinira every 16 months. Most recently, Warmup HIIT Interval Timer was updated on June 4, 2026 and Sinira on September 13, 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.*