# Schemelink vs OnSiren

The clearest difference is update cadence: OnSiren at weekly against Schemelink's every 18 months. Schemelink's advantage is iOS requirement (14.0 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.

Schemelink ships an update every 18 months, OnSiren weekly. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Schemelink | OnSiren |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Weekly** |
| Monetization | Free | — |
| Size | 6 MB | 124 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Stephen Davies](https://appshunter.io/developer/1174328536) | [OnSiren Limited](https://appshunter.io/developer/6795174860) |

## What reviewers say

### Schemelink

[App page](https://appshunter.io/ios/app/schemelink/id1406747048)

This app helps groups and schemes unify to prevent crime and anti-social behavior. It offers secure messaging, incident reporting, and meeting management to foster collaboration between members, police, and authorities for a safer environment.

**Highlights:** Secure group messaging with file sharing, Incident reporting, Meeting scheduler with reminders, Banned persons gallery, Push notifications for urgent alerts, Biometric login, DigiTalk two-way radio communication

**Features:** macOS Compatibility

**In-app purchases:** none


### OnSiren

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

**In-app purchases:** none


## Frequently asked questions

### Is Schemelink free?

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

### Is OnSiren free?

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

### Do Schemelink or OnSiren have ads?

Neither Schemelink nor OnSiren shows ads.

### Which is updated more often, Schemelink or OnSiren?

Schemelink ships an update every 18 months, and OnSiren weekly. Most recently, Schemelink was updated on October 10, 2026 and OnSiren on October 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*