# IntervalGuide vs Resonance

The clearest difference is ads: Resonance at none against IntervalGuide's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. IntervalGuide sells 1 in-app purchase, starting at $2.99 per month and Resonance sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

IntervalGuide ships an update every 11 days, Resonance weekly. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | IntervalGuide | Resonance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/resonance-hrv-biofeedback/id6812053481/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 11 days | **Weekly** |
| Monetization | — | Freemium |
| Size | 54 MB | 61 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Amir Tairi](https://appshunter.io/developer/6775922253) | [Groma Apps](https://appshunter.io/developer/6812053483) |

## What reviewers say

### IntervalGuide

[App page](https://appshunter.io/ios/app/intervalguide-intervall-timer/id6775922251)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IntervalGuide Premium | $2.99 | per month |


### Resonance

[App page](https://appshunter.io/ios/app/resonance-hrv-biofeedback/id6812053481)

This app personalizes breathing exercises by finding your unique resonance frequency, which optimizes heart rate variability. It uses live biofeedback from compatible smartwatches or chest straps to train you at your ideal pace for improved coherence and well-being. Practice sessions can be done offline without a sensor after initial setup.

**Highlights:** Personalized resonance frequency detection, Live HRV biofeedback, Compatibility with smartwatches and chest straps, Offline practice sessions, Detailed session history and trend charts, Customizable breath pacer with cues, Private by design, no account needed

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Resonance Pro - Monthly | $2.99 | per month |
| Resonance Pro - Yearly | $14.99 | per year |
| Resonance Pro — Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is IntervalGuide free?

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

### Is Resonance free?

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

### Do IntervalGuide or Resonance have ads?

IntervalGuide shows ads; Resonance does not.

### Which is updated more often, IntervalGuide or Resonance?

IntervalGuide ships an update every 11 days, and Resonance weekly. Most recently, IntervalGuide was updated on October 24, 2026 and Resonance on October 21, 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.*