# NDSD250 vs CarDSP调音助手

The clearest difference is in-app purchases: NDSD250 at none against CarDSP调音助手's 4. NDSD250 also leads on iOS requirement (9.0 vs 12.0). CarDSP调音助手's advantage is update cadence (every 2 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. CarDSP调音助手 sells 4 one-off in-app purchases. NDSD250 asks for nothing beyond the download.

NDSD250 ships an update every 2 months, CarDSP调音助手 every 2 days. Both last shipped on September 9, 2026.

## The numbers

| Metric | NDSD250 | CarDSP调音助手 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 91 MB | 27 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Guangzhou Aidan Blessindo Electronic Co.,Ltd.](https://appshunter.io/developer/1413008258) | [小慧 罗](https://appshunter.io/developer/1806960019) |

## What reviewers say

### NDSD250

[App page](https://appshunter.io/ios/app/ndsd250/id6451366743)

**Features:** macOS Compatibility

**In-app purchases:** none


### CarDSP调音助手

[App page](https://appshunter.io/ios/app/cardsp/id6768007393)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 开通1天(24小时) | $0.99 | one-time |
| 开通7天 | $3.99 | one-time |
| 开通30天 | $9.99 | one-time |
| 开通1年 | $39.99 | one-time |


## Frequently asked questions

### Is NDSD250 free?

NDSD250 is free to download, with no in-app purchases.

### Is CarDSP调音助手 free?

CarDSP调音助手 is free to download, with in-app purchases available.

### Do NDSD250 or CarDSP调音助手 have ads?

Neither NDSD250 nor CarDSP调音助手 shows ads.

### Which is updated more often, NDSD250 or CarDSP调音助手?

NDSD250 ships an update every 2 months, and CarDSP调音助手 every 2 days. Most recently, NDSD250 was updated on September 9, 2026 and CarDSP调音助手 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.*