# Prolight + Sound Guangzhou vs Rechnify

The clearest difference is in-app purchases: Prolight + Sound Guangzhou at none against Rechnify's 3. Prolight + Sound Guangzhou also leads on iOS requirement (16.6 vs 18.0). Rechnify's advantage is ads (none vs shown) and update cadence (every 2 days vs every 12 months). On price and device support there is nothing between them.

Both are free to download. Rechnify sells 3 in-app purchases, starting at $7.90 per month. Prolight + Sound Guangzhou asks for nothing beyond the download.

Prolight + Sound Guangzhou ships an update every 12 months, Rechnify every 2 days. The most recent releases landed on November 6, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Prolight + Sound Guangzhou | Rechnify |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 12 months | **Every 2 days** |
| Size | 85 MB | 10 MB |
| Requires iOS | **16.6** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Messe Frankfurt (HK) Ltd.](https://appshunter.io/developer/575433578) | [Flamur Ahmeti](https://appshunter.io/developer/1857404716) |

## What reviewers say

### Prolight + Sound Guangzhou

[App page](https://appshunter.io/ios/app/prolight-plus-sound-guangzhou/id807374447)

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

**In-app purchases:** none


### Rechnify

[App page](https://appshunter.io/ios/app/rechnify/id6761033641)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monat | $7.90 | per month |
| 6 Monate | $39.00 | per 6 months |
| Jahr | $69.00 | per year |


## Frequently asked questions

### Is Prolight + Sound Guangzhou free?

Prolight + Sound Guangzhou is free to download, with no in-app purchases.

### Is Rechnify free?

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

### Do Prolight + Sound Guangzhou or Rechnify have ads?

Prolight + Sound Guangzhou shows ads; Rechnify does not.

### Which is updated more often, Prolight + Sound Guangzhou or Rechnify?

Prolight + Sound Guangzhou ships an update every 12 months, and Rechnify every 2 days. Most recently, Prolight + Sound Guangzhou was updated on November 6, 2026 and Rechnify on November 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.*