# FSI 2026 vs OnSiren

The clearest difference is update cadence: OnSiren at weekly against FSI 2026's every 6 months. FSI 2026's advantage is iOS requirement (12.0 vs 16.4). 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.

FSI 2026 ships an update every 6 months, OnSiren weekly. The most recent releases landed on October 28, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | FSI 2026 | OnSiren |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 53.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | — | Free |
| Size | 74 MB | 128 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [European Fire Sprinkler Network](https://appshunter.io/developer/1681083204) | [OnSiren Limited](https://appshunter.io/developer/6795174860) |

## What reviewers say

### FSI 2026

[App page](https://appshunter.io/ios/app/fsi-2026/id6741063325)

**Features:** macOS Compatibility

**In-app purchases:** none


### OnSiren

[App page](https://appshunter.io/ios/app/onsiren/id6795977065)

This platform provides real-time shared awareness and threat intelligence for UK security officers. It briefs users on local events, allows for quick incident reporting, and offers push-to-talk communication with nearby colleagues. Membership requires a valid SIA license.

**Highlights:** Real-time threat intelligence briefings, Quick incident reporting with location, Push-to-talk communication, Shared awareness network for security officers, AI-powered local event updates

**In-app purchases:** none


## Frequently asked questions

### Is FSI 2026 free?

FSI 2026 is free to download, with no in-app purchases.

### Is OnSiren free?

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

### Do FSI 2026 or OnSiren have ads?

Neither FSI 2026 nor OnSiren shows ads.

### Which is updated more often, FSI 2026 or OnSiren?

FSI 2026 ships an update every 6 months, and OnSiren weekly. Most recently, FSI 2026 was updated on October 28, 2026 and OnSiren on November 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.*