# SIGNL4 vs Keepsy

The clearest difference is price: SIGNL4 at Free against Keepsy's $5.99. Keepsy's advantage is update cadence (every 2 days vs every 3 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

SIGNL4 is free to download; Keepsy costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SIGNL4 ships an update every 3 weeks, Keepsy every 2 days. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | SIGNL4 | Keepsy |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | **[4.5 (173 ratings)](https://appshunter.io/ios/app/signl4-mobile-alerting/id1100283480/reviews)** | — |
| Number of ratings | **173** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 64 MB | 2 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Derdack GmbH](https://appshunter.io/developer/466792511) | [Simon Walti](https://appshunter.io/developer/1792415949) |

## What reviewers say

### SIGNL4

[App page](https://appshunter.io/ios/app/signl4-mobile-alerting/id1100283480)

This app provides instant mobile alerting for critical incidents across various sectors like worker safety, IT operations, and disaster response. It ensures timely notification and response for teams through persistent alerts, acknowledgements, tracking, and escalations.

**Highlights:** Instant mobile alerting, Persistent notifications (push, SMS, voice), Acknowledgement and tracking, Automated escalations, On-call duty and shift management, Integrations with IT/IoT systems, Audit trails and reporting

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

**In-app purchases:** none


### Keepsy

[App page](https://appshunter.io/ios/app/keepsy/id6744258594)

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

**In-app purchases:** none


## Frequently asked questions

### Is SIGNL4 free?

SIGNL4 is free to download, with no in-app purchases.

### Is Keepsy free?

Keepsy costs $5.99, with no in-app purchases.

### Do SIGNL4 or Keepsy have ads?

Neither SIGNL4 nor Keepsy shows ads.

### Which is updated more often, SIGNL4 or Keepsy?

SIGNL4 ships an update every 3 weeks, and Keepsy every 2 days. Most recently, SIGNL4 was updated on November 2, 2026 and Keepsy 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.*