# DSP vs NDSR355A

The clearest difference is update cadence: DSP at every 5 days against NDSR355A's every 10 months. NDSR355A's advantage is iOS requirement (9.0 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DSP ships an update every 5 days, NDSR355A every 10 months. The most recent releases landed on September 15, 2026 and May 17, 2026 respectively.

## The numbers

| Metric | DSP | NDSR355A |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 10 months |
| Size | 30 MB | 39 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Guangzhou Fenlang Electronic Technology Co., Ltd.;](https://appshunter.io/developer/1125294061) | [Guangzhou Aidan Blessindo Electronic Co.,Ltd.](https://appshunter.io/developer/1413008258) |

## What reviewers say

### DSP

[App page](https://appshunter.io/ios/app/dsp-a12u/id1524254899)

**Features:** macOS Compatibility

**In-app purchases:** none


### NDSR355A

[App page](https://appshunter.io/ios/app/ndsr355a/id6449562008)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DSP free?

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

### Is NDSR355A free?

NDSR355A is free to download, with no in-app purchases.

### Do DSP or NDSR355A have ads?

Neither DSP nor NDSR355A shows ads.

### Which is updated more often, DSP or NDSR355A?

DSP ships an update every 5 days, and NDSR355A every 10 months. Most recently, DSP was updated on September 15, 2026 and NDSR355A on May 17, 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.*