# Void vs HeartCalc

The clearest difference is price: Void at Free against HeartCalc's $0.49. Void also leads on ratings volume (3 vs 1). HeartCalc's advantage is update cadence (every 2 months vs every 10 months) and iOS requirement (16.6 vs 18.2). On rating, review sentiment, ads and in-app purchases there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Void against 5.0 for HeartCalc. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Void ships an update every 10 months, HeartCalc every 2 months. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Void | HeartCalc |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/void-meditation/id6738365261/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/heartcalc/id6749575285/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 32 MB | 1 MB |
| Requires iOS | 18.2 | **16.6** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Christopher Langton](https://appshunter.io/developer/1446715063) | [Florian Schimanke](https://appshunter.io/developer/288399510) |

## What reviewers say

### Void

[App page](https://appshunter.io/ios/app/void-meditation/id6738365261)

This app offers a minimalist approach to meditation with a large, clear timer. It includes optional session timers, interval bells, and ambient sounds. Track your meditation streaks and sync sessions with your health data.

**Highlights:** Large, clear meditation timer, Optional session timer and interval bells, Ambient sounds for focus, Streak tracking for consistency, Syncs with Health app

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Void free?

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

### Is HeartCalc free?

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

### Which has better reviews, Void or HeartCalc?

Void and HeartCalc are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do Void or HeartCalc have ads?

Neither Void nor HeartCalc shows ads.

### Which is updated more often, Void or HeartCalc?

Void ships an update every 10 months, and HeartCalc every 2 months. Most recently, Void was updated on September 17, 2026 and HeartCalc on September 9, 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.*