# Si vs FieldFusion

The clearest difference is update cadence: FieldFusion at every 2 months against Si's every 5 months. Si's advantage is iOS requirement (9.1 vs 14.0). 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.

Si ships an update every 5 months, FieldFusion every 2 months. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Si | FieldFusion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Size | 12 MB | 37 MB |
| Requires iOS | **9.1** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [旭日东方](https://appshunter.io/developer/1472957256) | [VIRTUX INNOVATIONS PTE. LTD.](https://appshunter.io/developer/1694474509) |

## What reviewers say

### Si

[App page](https://appshunter.io/ios/app/si-link/id1484583420)

**Features:** macOS Compatibility

**In-app purchases:** none


### FieldFusion

[App page](https://appshunter.io/ios/app/fieldfusion-fms/id6746783397)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Si free?

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

### Is FieldFusion free?

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

### Do Si or FieldFusion have ads?

Neither Si nor FieldFusion shows ads.

### Which is updated more often, Si or FieldFusion?

Si ships an update every 5 months, and FieldFusion every 2 months. Most recently, Si was updated on October 26, 2026 and FieldFusion on October 30, 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.*