# UNKNOWN vs AcuSpark2

The clearest difference is update cadence: AcuSpark2 at every 8 months against UNKNOWN's every 34 months. UNKNOWN's advantage is iOS requirement (13.0 vs 15.0). 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.

UNKNOWN ships an update every 34 months, AcuSpark2 every 8 months. The most recent releases landed on September 13, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | UNKNOWN | AcuSpark2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.7 (3 ratings)](https://appshunter.io/ios/app/acuspark2/id6444468468/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 34 months | **Every 8 months** |
| Monetization | — | Free |
| Size | 3 MB | 72 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [shingo kamei](https://appshunter.io/developer/1256845824) | [JANOME Corporation](https://appshunter.io/developer/663694195) |

## What reviewers say

### UNKNOWN

[App page](https://appshunter.io/ios/app/unknown/id1591406924)

**In-app purchases:** none


### AcuSpark2

[App page](https://appshunter.io/ios/app/acuspark2/id6444468468)

This app guides you through using your sewing machine with clear instructions and helpful tips. It can scan QR codes on your machine to provide specific guidance and inspiration, even without a connected device.

**Highlights:** Sewing machine usage instructions, QR code scanning for machine status, Step-by-step sewing method videos, Presser foot descriptions, Stitch chart, Multilingual support

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is UNKNOWN free?

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

### Is AcuSpark2 free?

AcuSpark2 is free to download, with no in-app purchases.

### Do UNKNOWN or AcuSpark2 have ads?

Neither UNKNOWN nor AcuSpark2 shows ads.

### Which is updated more often, UNKNOWN or AcuSpark2?

UNKNOWN ships an update every 34 months, and AcuSpark2 every 8 months. Most recently, UNKNOWN was updated on September 13, 2026 and AcuSpark2 on September 24, 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.*