# VisKeyboard vs Thunder DSP

The clearest difference is update cadence: Thunder DSP at every 5 days against VisKeyboard's every 2 months. VisKeyboard's advantage is iOS requirement (9.3 vs 11.0). 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.

VisKeyboard ships an update every 2 months, Thunder DSP every 5 days. The most recent releases landed on May 15, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | VisKeyboard | Thunder DSP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Size | 70 MB | 5 MB |
| Requires iOS | **9.3** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Vexel Software Technology Co.,Ltd.](https://appshunter.io/developer/1228572319) | [AMERICAN PRO INTERNATIONAL CORP](https://appshunter.io/developer/1071760180) |

## What reviewers say

### VisKeyboard

[App page](https://appshunter.io/ios/app/viskeyboard/id1562070996)

**Features:** macOS Compatibility

**In-app purchases:** none


### Thunder DSP

[App page](https://appshunter.io/ios/app/thunder-dsp/id6744083152)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is VisKeyboard free?

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

### Is Thunder DSP free?

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

### Do VisKeyboard or Thunder DSP have ads?

Neither VisKeyboard nor Thunder DSP shows ads.

### Which is updated more often, VisKeyboard or Thunder DSP?

VisKeyboard ships an update every 2 months, and Thunder DSP every 5 days. Most recently, VisKeyboard was updated on May 15, 2026 and Thunder DSP 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.*