# Delta Timer △ vs Fartlek

The clearest difference is in-app purchases: Delta Timer △ at none against Fartlek's 3. Fartlek's advantage is update cadence (every 4 days vs every 10 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Fartlek sells 3 in-app purchases, starting at $1.99 per 7 days. Delta Timer △ asks for nothing beyond the download.

Delta Timer △ ships an update every 10 days, Fartlek every 4 days. Both last shipped on October 30, 2026.

## The numbers

| Metric | Delta Timer △ | Fartlek |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/delta-timer/id6748762829/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | Free | — |
| Size | 12 MB | 29 MB |
| Requires iOS | **18.1** | 18.5 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Delgado Dias](https://appshunter.io/developer/944281589) | [Axis SA](https://appshunter.io/developer/1621529800) |

## What reviewers say

### Delta Timer △

[App page](https://appshunter.io/ios/app/delta-timer/id6748762829)

This interval timer app guides users through various training routines like HIIT and Tabata. It offers customizable workouts with adjustable exercise and rest periods, featuring a minimalist design with light and dark modes for focused training.

**Highlights:** Customizable workout creation, Adjustable exercise and rest durations, Minimalist, distraction-free interface, Light and dark modes, Supports HIIT, Tabata, EMOM, and circuits

**Features:** macOS Compatibility

**In-app purchases:** none


### Fartlek

[App page](https://appshunter.io/ios/app/fartlek-interval-run-timer/id6752724674)

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $1.99 | per 7 days |
| Monthly premium | $4.99 | per month |
| Yearly Premium | $29.99 | per year |


## Frequently asked questions

### Is Delta Timer △ free?

Delta Timer △ is free to download, with no in-app purchases.

### Is Fartlek free?

Fartlek is free to download, with in-app purchases available.

### Do Delta Timer △ or Fartlek have ads?

Neither Delta Timer △ nor Fartlek shows ads.

### Which is updated more often, Delta Timer △ or Fartlek?

Delta Timer △ ships an update every 10 days, and Fartlek every 4 days. Most recently, Delta Timer △ was updated on October 30, 2026 and Fartlek on October 30, 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.*