# Soil Sensor Calculator vs 100k Mentor Challenge

The clearest difference is rating: Soil Sensor Calculator at 5.0 against 100k Mentor Challenge's 4.2. Soil Sensor Calculator also leads on ads (none vs shown) and monetization model (free vs ad-supported). 100k Mentor Challenge's advantage is update cadence (monthly vs every 5 months) and ratings volume (19 vs 6). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Soil Sensor Calculator holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 6 and 19 respectively.

Soil Sensor Calculator ships an update every 5 months, 100k Mentor Challenge monthly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Soil Sensor Calculator | 100k Mentor Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/soil-sensor-calculator/id1332146282/reviews)** | [4.2 (19 ratings)](https://appshunter.io/ios/app/100k-mentor-challenge/id1528816720/reviews) |
| Number of ratings | 6 | **19** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | **Free** | Ad-supported |
| Size | 9 MB | 45 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chris Henry](https://appshunter.io/developer/1188474414) | [ProMazo, Inc.](https://appshunter.io/developer/1528816722) |

## What reviewers say

### Soil Sensor Calculator

[App page](https://appshunter.io/ios/app/soil-sensor-calculator/id1332146282)

This tool helps users calculate irrigation needs based on Watermark sensor readings. It determines average centibar readings, available water, stress levels, and irrigation requirements, factoring in soil type and growth stage.

**Highlights:** Enter Watermark sensor readings, Calculate average centibar reading, Determine available water remaining, Assess soil stress level, Calculate days to irrigation, Estimate water required for irrigation

**Features:** macOS Compatibility

**In-app purchases:** none


### 100k Mentor Challenge

[App page](https://appshunter.io/ios/app/100k-mentor-challenge/id1528816720)

Connect with mentors or aspiring leaders to achieve career goals. This app helps diverse college students gain career advice, build networks, and boost confidence. Complete your profile to join the next mentorship match.

**Highlights:** Mentorship matching, Career advice, Networking opportunities, Goal encouragement, Profile completion

**In-app purchases:** none


## Frequently asked questions

### Is Soil Sensor Calculator free?

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

### Is 100k Mentor Challenge free?

100k Mentor Challenge is free to download, with no in-app purchases.

### Which has better reviews, Soil Sensor Calculator or 100k Mentor Challenge?

Soil Sensor Calculator is rated higher. Soil Sensor Calculator averages 5.0 out of 5 from 6 ratings, while 100k Mentor Challenge averages 4.2 from 19 ratings.

### Do Soil Sensor Calculator or 100k Mentor Challenge have ads?

100k Mentor Challenge shows ads; Soil Sensor Calculator does not.

### Which is updated more often, Soil Sensor Calculator or 100k Mentor Challenge?

Soil Sensor Calculator ships an update every 5 months, and 100k Mentor Challenge monthly. Most recently, Soil Sensor Calculator was updated on October 24, 2026 and 100k Mentor Challenge on October 29, 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.*