# HeartCalc vs Mindful Sound Timer

The clearest difference is price: Mindful Sound Timer at Free against HeartCalc's $0.49. HeartCalc's advantage is iOS requirement (16.6 vs 18.5). On update cadence, ads, in-app purchases and device support there is nothing between them.

Mindful Sound Timer is free to download; HeartCalc costs $0.49 up front. Neither carries in-app purchases, so what you see is what you pay.

HeartCalc ships an update every 2 months, Mindful Sound Timer every 3 months. The most recent releases landed on September 9, 2026 and May 18, 2026 respectively.

## The numbers

| Metric | HeartCalc | Mindful Sound Timer |
| --- | --- | --- |
| Price | $0.49 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/heartcalc/id6749575285/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | — |
| Size | 1 MB | 8 MB |
| Requires iOS | **16.6** | 18.5 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 12+ | 4+ |
| Developer | [Florian Schimanke](https://appshunter.io/developer/288399510) | [Conner Tate](https://appshunter.io/developer/1511248058) |

## What reviewers say

### HeartCalc

[App page](https://appshunter.io/ios/app/heartcalc/id6749575285)

Calculate your optimal heart rate training zones using 8 proven formulas. Get personalized zone recommendations for warm-up, fat burn, aerobic, anaerobic, and VO₂ max activities. Train smarter with science-backed insights for maximum fitness results.

**Highlights:** 8 proven heart rate formulas, Personalized training zones, Instant calculations, Detailed explanations, Automatic data saving, Clean interface

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

**In-app purchases:** none


### Mindful Sound Timer

[App page](https://appshunter.io/ios/app/mindful-sound-timer/id6751171293)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HeartCalc free?

HeartCalc costs $0.49, with no in-app purchases.

### Is Mindful Sound Timer free?

Mindful Sound Timer is free to download, with no in-app purchases.

### Do HeartCalc or Mindful Sound Timer have ads?

Neither HeartCalc nor Mindful Sound Timer shows ads.

### Which is updated more often, HeartCalc or Mindful Sound Timer?

HeartCalc ships an update every 2 months, and Mindful Sound Timer every 3 months. Most recently, HeartCalc was updated on September 9, 2026 and Mindful Sound Timer on May 18, 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.*