# dB Convert vs Polarity pulses

The clearest difference is price: Polarity pulses at Free against dB Convert's $0.29. Polarity pulses also leads on update cadence (every 2 days vs every 8 days) and iOS requirement (12 vs 17.0). dB Convert's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

Polarity pulses is free to download; dB Convert costs $0.29 up front. Polarity pulses sells 1 one-off in-app purchase. dB Convert asks for nothing beyond the download.

dB Convert ships an update every 8 days, Polarity pulses every 2 days. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | dB Convert | Polarity pulses |
| --- | --- | --- |
| Price | $0.29 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 2 days** |
| Size | 1 MB | 18 MB |
| Requires iOS | 17.0 | **12** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jeff Curtis](https://appshunter.io/developer/358219019) | [小慧 罗](https://appshunter.io/developer/1806960019) |

## What reviewers say

### dB Convert

[App page](https://appshunter.io/ios/app/db-convert/id6445955728)

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

**In-app purchases:** none


### Polarity pulses

[App page](https://appshunter.io/ios/app/polarity-pulses/id6770177079)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full Access | $1.99 | one-time |


## Frequently asked questions

### Is dB Convert free?

dB Convert costs $0.29, with no in-app purchases.

### Is Polarity pulses free?

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

### Do dB Convert or Polarity pulses have ads?

Neither dB Convert nor Polarity pulses shows ads.

### Which is updated more often, dB Convert or Polarity pulses?

dB Convert ships an update every 8 days, and Polarity pulses every 2 days. Most recently, dB Convert was updated on October 8, 2026 and Polarity pulses on October 13, 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.*