# echOpen ON vs SFNDT

The clearest difference is ads: echOpen ON at none against SFNDT's shown. SFNDT's advantage is iOS requirement (15.6 vs 17.0). On price, update cadence, 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.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | echOpen ON | SFNDT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | Every 4 months |
| Size | 67 MB | 104 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [echopen factory](https://appshunter.io/developer/1530808488) | [CYIM](https://appshunter.io/developer/394180060) |

## What reviewers say

### echOpen ON

[App page](https://appshunter.io/ios/app/echopen-on/id1664469384)

**In-app purchases:** none


### SFNDT

[App page](https://appshunter.io/ios/app/sfndt/id6748649751)

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

**In-app purchases:** none


## Frequently asked questions

### Is echOpen ON free?

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

### Is SFNDT free?

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

### Do echOpen ON or SFNDT have ads?

SFNDT shows ads; echOpen ON does not.

### Which is updated more often, echOpen ON or SFNDT?

echOpen ON ships an update every 4 months, and SFNDT every 4 months. Most recently, echOpen ON was updated on October 1, 2026 and SFNDT on October 14, 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.*