# QuietAlert vs Plen

The clearest difference is review sentiment: Plen at 100% against QuietAlert's 44%. Plen also leads on in-app purchases (none vs 3) and update cadence (every 6 days vs every 12 months). On price, ads and device support there is nothing between them.

Both are free to download. QuietAlert sells 3 one-off in-app purchases. Plen asks for nothing beyond the download.

QuietAlert ships an update every 12 months, Plen every 6 days. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | QuietAlert | Plen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.8 (16 ratings)](https://appshunter.io/ios/app/quietalert/id1030822316/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 43.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 6 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 18 MB | 203 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yasushi Sakai](https://appshunter.io/developer/454423149) | [Automata Solutions Ltd.](https://appshunter.io/developer/1520244123) |

## What reviewers say

### QuietAlert

[App page](https://appshunter.io/ios/app/quietalert/id1030822316)

This utility app notifies you of timer completion using LED flashes and vibration, ideal for quiet environments like libraries or trains. It offers customizable vibration frequencies and optional sound alerts, even playing through headphones.

**Highlights:** LED flash and vibration alerts, Customizable vibration frequency, Background operation, Optional beep on completion, Headphone-only sound output, Custom alarm sound support, Widget alarm stop

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sound Option | $1.99 | one-time |
| Alarm Option | $1.99 | one-time |
| Widget Option | $1.99 | one-time |


### Plen

[App page](https://appshunter.io/ios/app/plen/id6504163423)

Track aircraft in real-time with live location updates. See planes as they fly and monitor weather conditions along their routes. Discover various types of aircraft with this intuitive radar tool.

**Highlights:** Real-time ADS-B tracking, Live aircraft location updates, Weather updates for flight paths, Discover different types of aircraft, Intuitive radar interface

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

**In-app purchases:** none


## Frequently asked questions

### Is QuietAlert free?

QuietAlert is free to download, with in-app purchases available.

### Is Plen free?

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

### Do QuietAlert or Plen have ads?

Neither QuietAlert nor Plen shows ads.

### Which is updated more often, QuietAlert or Plen?

QuietAlert ships an update every 12 months, and Plen every 6 days. Most recently, QuietAlert was updated on October 24, 2026 and Plen on October 27, 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.*