# RUN interval vs 1SecondLap

The clearest difference is in-app purchases: 1SecondLap at none against RUN interval's 2. 1SecondLap also leads on update cadence (daily vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RUN interval sells 2 one-off in-app purchases. 1SecondLap asks for nothing beyond the download.

RUN interval ships an update every 3 months, 1SecondLap daily. The most recent releases landed on October 12, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | RUN interval | 1SecondLap |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1K ratings)](https://appshunter.io/ios/app/run-interval-running-timer/id1352270752/reviews)** | — |
| Number of ratings | **1K** | — |
| Positive reviews | 77.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 34 MB | 9 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [CAN YOU HEAR ME SOFTWARE](https://appshunter.io/developer/711042540) | [DOCUEX LIMITED](https://appshunter.io/developer/6783314970) |

## What reviewers say

### RUN interval

[App page](https://appshunter.io/ios/app/run-interval-running-timer/id1352270752)

This app simplifies interval and Fartlek running by allowing you to set custom targets for time or distance during hard, easy, and rest efforts. It offers detailed post-run summaries, audio and visual feedback, and an Apple Watch app for enhanced training.

**Highlights:** Customizable interval sessions, Time and distance targets, Distance Goal option, Audio and visual feedback, Detailed run summaries, Apple Watch app, Strava sharing

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The full RUN interval | $1.99 | one-time |
| The full RUN interval | $3.99 | one-time |


### 1SecondLap

[App page](https://appshunter.io/ios/app/1secondlap/id6783314968)

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

**In-app purchases:** none


## Frequently asked questions

### Is RUN interval free?

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

### Is 1SecondLap free?

1SecondLap is free to download, with no in-app purchases.

### Do RUN interval or 1SecondLap have ads?

Neither RUN interval nor 1SecondLap shows ads.

### Which is updated more often, RUN interval or 1SecondLap?

RUN interval ships an update every 3 months, and 1SecondLap daily. Most recently, RUN interval was updated on October 12, 2026 and 1SecondLap on October 1, 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.*