# Cellular Alarm Contact Sensor vs Instant Timer

The clearest difference is in-app purchases: Cellular Alarm Contact Sensor at none against Instant Timer's 2. Cellular Alarm Contact Sensor also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 25 months). On price and device support there is nothing between them.

Both are free to download. Instant Timer sells 2 in-app purchases, starting at $0.99 per month. Cellular Alarm Contact Sensor asks for nothing beyond the download.

Cellular Alarm Contact Sensor ships an update every 3 weeks, Instant Timer every 25 months. The most recent releases landed on October 18, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Cellular Alarm Contact Sensor | Instant Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 25 months |
| Size | 2 MB | 6 MB |
| Requires iOS | **13.4** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Robert Taraszka](https://appshunter.io/developer/1518710123) | [David Leander Dias Duarte](https://appshunter.io/developer/1695919834) |

## What reviewers say

### Cellular Alarm Contact Sensor

[App page](https://appshunter.io/ios/app/cellular-alarm-contact-sensor/id1518710124)

**Features:** macOS Compatibility

**In-app purchases:** none


### Instant Timer

[App page](https://appshunter.io/ios/app/instant-timer-quick-timers/id6450960205)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Instant Timer Pro (Monthly) | $0.99 | per month |
| Instant Timer Pro (Yearly) | $10.00 | per year |


## Frequently asked questions

### Is Cellular Alarm Contact Sensor free?

Cellular Alarm Contact Sensor is free to download, with no in-app purchases.

### Is Instant Timer free?

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

### Do Cellular Alarm Contact Sensor or Instant Timer have ads?

Instant Timer shows ads; Cellular Alarm Contact Sensor does not.

### Which is updated more often, Cellular Alarm Contact Sensor or Instant Timer?

Cellular Alarm Contact Sensor ships an update every 3 weeks, and Instant Timer every 25 months. Most recently, Cellular Alarm Contact Sensor was updated on October 18, 2026 and Instant Timer on October 13, 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.*