# Necto Sensor vs SCT Calculator 3

The clearest difference is price: Necto Sensor at Free against SCT Calculator 3's $0.99. Necto Sensor also leads on update cadence (every 5 weeks vs every 8 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Necto Sensor is free to download; SCT Calculator 3 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Necto Sensor ships an update every 5 weeks, SCT Calculator 3 every 8 months. Both last shipped on October 25, 2026.

## The numbers

| Metric | Necto Sensor | SCT Calculator 3 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.7 (6 ratings)](https://appshunter.io/ios/app/necto-sensor/id6596772851/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 8 months |
| Monetization | Free | — |
| Size | 33 MB | 4 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [YT INNOVATIONS LLC](https://appshunter.io/developer/1760589427) | [Timothy Alan Verrelli](https://appshunter.io/developer/1761433304) |

## What reviewers say

### Necto Sensor

[App page](https://appshunter.io/ios/app/necto-sensor/id6596772851)

This app allows real-time remote monitoring of temperature, humidity, and power status using a cellular-connected sensor. It sends customizable alerts for critical environmental changes, providing peace of mind for property conditions.

**Highlights:** Real-time temperature monitoring, Real-time humidity monitoring, Power status monitoring, Cellular network operation (no Wi-Fi needed), Customizable alert thresholds, Device registration and setup

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

**In-app purchases:** none


### SCT Calculator 3

[App page](https://appshunter.io/ios/app/sct-calculator-3/id6615060947)

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

**In-app purchases:** none


## Frequently asked questions

### Is Necto Sensor free?

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

### Is SCT Calculator 3 free?

SCT Calculator 3 costs $0.99, with no in-app purchases.

### Do Necto Sensor or SCT Calculator 3 have ads?

Neither Necto Sensor nor SCT Calculator 3 shows ads.

### Which is updated more often, Necto Sensor or SCT Calculator 3?

Necto Sensor ships an update every 5 weeks, and SCT Calculator 3 every 8 months. Most recently, Necto Sensor was updated on October 25, 2026 and SCT Calculator 3 on October 25, 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.*