# Sound Level · Baro vs Heliochron

The clearest difference is update cadence: Sound Level · Baro at every 3 days against Heliochron's weekly. Sound Level · Baro also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Sound Level · Baro costs $0.99 and Heliochron $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sound Level · Baro ships an update every 3 days, Heliochron weekly. The most recent releases landed on November 10, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sound Level · Baro | Heliochron |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/sound-level-baro/id6779881299/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Paid | — |
| Size | 23 MB | 28 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Euiseok Kim](https://appshunter.io/developer/1879633122) | [ViSSee AG](https://appshunter.io/developer/374083637) |

## What reviewers say

### Sound Level · Baro

[App page](https://appshunter.io/ios/app/sound-level-baro/id6779881299)

Measure and record sound levels in decibels with a live readout and historical data. It includes noise limit information for six countries and allows for manual recording of sound events. All data is stored locally for privacy.

**Highlights:** Live decibel readout, Record sound events with start time and duration, Two-hour band summary of disturbances, Noise limits for six countries, Offline functionality, Local data storage

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

**In-app purchases:** none


### Heliochron

[App page](https://appshunter.io/ios/app/heliochron/id6810693998)

**In-app purchases:** none


## Frequently asked questions

### Is Sound Level · Baro free?

Sound Level · Baro costs $0.99, with no in-app purchases.

### Is Heliochron free?

Heliochron costs $0.99, with no in-app purchases.

### Do Sound Level · Baro or Heliochron have ads?

Neither Sound Level · Baro nor Heliochron shows ads.

### Which is updated more often, Sound Level · Baro or Heliochron?

Sound Level · Baro ships an update every 3 days, and Heliochron weekly. Most recently, Sound Level · Baro was updated on November 10, 2026 and Heliochron on October 31, 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.*