# CloudLabs Solubility Constant vs Rapid Relay Calculator

The clearest difference is update cadence: Rapid Relay Calculator at every 4 weeks against CloudLabs Solubility Constant's every 28 months. CloudLabs Solubility Constant's advantage is iOS requirement (9.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

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

CloudLabs Solubility Constant ships an update every 28 months, Rapid Relay Calculator every 4 weeks. The most recent releases landed on October 27, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CloudLabs Solubility Constant | Rapid Relay Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/rapid-relay-calculator/id6738112792/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 4 weeks** |
| Monetization | — | Free |
| Size | 72 MB | 5 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Jiovany Orozco](https://appshunter.io/developer/1114670847) | [Tao Dong](https://appshunter.io/developer/1779419667) |

## What reviewers say

### CloudLabs Solubility Constant

[App page](https://appshunter.io/ios/app/cloudlabs-solubility-constant/id1596507800)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rapid Relay Calculator

[App page](https://appshunter.io/ios/app/rapid-relay-calculator/id6738112792)

This app helps VEX IQ Robotics Competition participants quickly and accurately calculate scores for the Rapid Relay game. It supports both Teamwork and Skills matches, offers interactive scoring, and allows for saving match data with sorting options. Features like dark mode and keyboard input enhance usability for teams, judges, and coaches.

**Highlights:** Teamwork and Skills match support, Interactive scoring, Score saving with sorting, Practice match schedule generator, Dark mode support, Keyboard input option

**In-app purchases:** none


## Frequently asked questions

### Is CloudLabs Solubility Constant free?

CloudLabs Solubility Constant is free to download, with no in-app purchases.

### Is Rapid Relay Calculator free?

Rapid Relay Calculator is free to download, with no in-app purchases.

### Do CloudLabs Solubility Constant or Rapid Relay Calculator have ads?

Neither CloudLabs Solubility Constant nor Rapid Relay Calculator shows ads.

### Which is updated more often, CloudLabs Solubility Constant or Rapid Relay Calculator?

CloudLabs Solubility Constant ships an update every 28 months, and Rapid Relay Calculator every 4 weeks. Most recently, CloudLabs Solubility Constant was updated on October 27, 2026 and Rapid Relay Calculator on October 7, 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.*