# Interval Timer vs SFL Trainer

The clearest difference is in-app purchases: SFL Trainer at none against Interval Timer's 8. SFL Trainer also leads on ads (none vs shown) and iOS requirement (13.4 vs 15.0). Interval Timer's advantage is update cadence (fortnightly vs every 5 weeks) and device support (4 vs 2). On price there is nothing between them.

Both are free to download. Interval Timer sells 8 in-app purchases, starting at $3.99 per month. SFL Trainer asks for nothing beyond the download.

Interval Timer ships an update fortnightly, SFL Trainer every 5 weeks. The most recent releases landed on October 24, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Interval Timer | SFL Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (297 ratings)](https://appshunter.io/ios/app/interval-timer-purehiit/id1198752738/reviews)** | — |
| Number of ratings | **297** | — |
| Positive reviews | 73.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 45 MB | 21 MB |
| Requires iOS | 15.0 | **13.4** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [Miklos Pavel](https://appshunter.io/developer/979923367) | [Scope Software Solutions LLC](https://appshunter.io/developer/1482938062) |

## What reviewers say

### Interval Timer

[App page](https://appshunter.io/ios/app/interval-timer-purehiit/id1198752738)

This app provides a simple and customizable timer for interval training like HIIT, Tabata, and EMOM. It offers audio cues, background operation, and integrates with Apple Watch for health tracking. Pre-built routines and workout reminders help users stay consistent with their fitness goals.

**Highlights:** Customizable interval timer, Audio alerts for rounds, Background operation, Apple Watch integration, Workout reminders, Pre-built routines

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Yearly | $19.99 | per year |
| Premium features | Free | one-time |
| Remove Ads | $1.99 | one-time |
| Custom sounds | $1.99 | one-time |
| Premium features | $4.99 | one-time |
| Premium features | $9.99 | one-time |
| Premium features | $14.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 👍 Great timer functionality
- 👍 Can program intervals (warmup, activity, rest, cool down)
- 👍 Supports many rounds (up to 100)
- 👍 Ability to save workouts

**What reviewers complain about**

- 💰 App became paid unexpectedly
- 💰 Premium required to start timer
- 💡 Round cap limits functionality for high rep activities
- 💡 Needs more than 30 intervals for some routines (e.g., stretching)
- 💡 Lacks a background click feature (e.g., every second)

**Reported bugs**

- Advertisements still present after paying for removal
- App requires premium to start timer (recent change)

**Requested features**

- Remove the cap on rounds
- Add a background click feature (e.g., every second)
- More sound options
- Option for more than one workout
- Add a halfway beep


### SFL Trainer

[App page](https://appshunter.io/ios/app/sfl-trainer/id6478163336)

**In-app purchases:** none


## Frequently asked questions

### Is Interval Timer free?

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

### Is SFL Trainer free?

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

### Do Interval Timer or SFL Trainer have ads?

Interval Timer shows ads; SFL Trainer does not.

### Which is updated more often, Interval Timer or SFL Trainer?

Interval Timer ships an update fortnightly, and SFL Trainer every 5 weeks. Most recently, Interval Timer was updated on October 24, 2026 and SFL Trainer on October 3, 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.*