# Envoz vs Sumflash

The clearest difference is ads: Envoz at none against Sumflash's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Envoz sells 2 in-app purchases, starting at $8.00 per month and Sumflash sells 1 in-app purchase, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Envoz ships an update every 6 days, Sumflash every 3 days. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Envoz | Sumflash |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 days | **Every 3 days** |
| Size | 60 MB | 14 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [PF International LLC](https://appshunter.io/developer/6775251899) | [Toru Fukui](https://appshunter.io/developer/1888097145) |

## What reviewers say

### Envoz

[App page](https://appshunter.io/ios/app/envoz/id6792136536)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Practice | $8.00 | per month |
| Fluent | $16.00 | per month |


### Sumflash

[App page](https://appshunter.io/ios/app/sumflash-mental-math-flash/id6816003975)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) | $1.99 | per month |


## Frequently asked questions

### Is Envoz free?

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

### Is Sumflash free?

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

### Do Envoz or Sumflash have ads?

Sumflash shows ads; Envoz does not.

### Which is updated more often, Envoz or Sumflash?

Envoz ships an update every 6 days, and Sumflash every 3 days. Most recently, Envoz was updated on October 8, 2026 and Sumflash on October 6, 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.*