# Rainbow Solutions App vs SUM NUM

The clearest difference is rating: SUM NUM at 5.0 against Rainbow Solutions App's 4.0. SUM NUM also leads on update cadence (monthly vs every 4 months). Rainbow Solutions App's advantage is iOS requirement (12.0 vs 15.6). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

SUM NUM holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Rainbow Solutions App ships an update every 4 months, SUM NUM monthly. The most recent releases landed on September 22, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Rainbow Solutions App | SUM NUM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/rainbow-solutions-app/id6474077027/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sum-num/id6755496124/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free | Free |
| Size | 83 MB | 19 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [山东潍坊润丰化工股份有限公司](https://appshunter.io/developer/1480654492) | [Subway de Guatemala SA](https://appshunter.io/developer/1264179918) |

## What reviewers say

### Rainbow Solutions App

[App page](https://appshunter.io/ios/app/rainbow-solutions-app/id6474077027)

Discover tailored recommendations for your agricultural field based on region, crop, and specific issues. Access technical information about products and connect directly with agricultural experts.

**Highlights:** Region-specific recommendations, Crop-based advice, Problem-solving guidance, Technical product information, Direct expert contact

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

**In-app purchases:** none


### SUM NUM

[App page](https://appshunter.io/ios/app/sum-num/id6755496124)

This app helps manage inventory, convert measurements, and perform financial calculations for business operations. It features a calculator with history, a comprehensive unit converter, and advanced financial tools like interest and amortization calculations.

**Highlights:** Calculator with history, Unit converter for mass, volume, length, temperature, Financial calculator (interest, TVM, amortization), Save and reuse calculation results, Export financial results to PDF

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

**In-app purchases:** none


## Frequently asked questions

### Is Rainbow Solutions App free?

Rainbow Solutions App is free to download, with no in-app purchases.

### Is SUM NUM free?

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

### Which has better reviews, Rainbow Solutions App or SUM NUM?

SUM NUM is rated higher. Rainbow Solutions App averages 4.0 out of 5 from 1 ratings, while SUM NUM averages 5.0 from 1 ratings.

### Do Rainbow Solutions App or SUM NUM have ads?

Neither Rainbow Solutions App nor SUM NUM shows ads.

### Which is updated more often, Rainbow Solutions App or SUM NUM?

Rainbow Solutions App ships an update every 4 months, and SUM NUM monthly. Most recently, Rainbow Solutions App was updated on September 22, 2026 and SUM NUM on October 1, 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.*