# Combustion Guide vs Work2Do Proveedor

The clearest difference is ads: Combustion Guide at none against Work2Do Proveedor's shown. Combustion Guide also leads on update cadence (every 2 months vs every 13 months) and iOS requirement (12.0 vs 15.0). On price, 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.

Combustion Guide ships an update every 2 months, Work2Do Proveedor every 13 months. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Combustion Guide | Work2Do Proveedor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/combustion-guide-by-fives/id6447003291/reviews)** | — |
| Number of ratings | **6** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 13 months |
| Monetization | Free | — |
| Size | 3 MB | 62 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Fives North American Combustion Inc.](https://appshunter.io/developer/1679983323) | [REPUBLIKEC S.A.](https://appshunter.io/developer/1233370242) |

## What reviewers say

### Combustion Guide

[App page](https://appshunter.io/ios/app/combustion-guide-by-fives/id6447003291)

Explore combustion principles and technologies with this comprehensive guide. Access Fives literature, utilize calculation tools for custom fuels, and customize units for your needs. Ideal for students and industry professionals.

**Highlights:** Combustion principle explanations, Access to Fives literature, Custom fuel and oxidant calculations, Metric and US unit options, Standard to normal flow conversions, Industry-specific insights

**Features:** macOS Compatibility

**In-app purchases:** none


### Work2Do Proveedor

[App page](https://appshunter.io/ios/app/work2do-proveedor/id6469199543)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Combustion Guide free?

Combustion Guide is free to download, with no in-app purchases.

### Is Work2Do Proveedor free?

Work2Do Proveedor is free to download, with no in-app purchases.

### Do Combustion Guide or Work2Do Proveedor have ads?

Work2Do Proveedor shows ads; Combustion Guide does not.

### Which is updated more often, Combustion Guide or Work2Do Proveedor?

Combustion Guide ships an update every 2 months, and Work2Do Proveedor every 13 months. Most recently, Combustion Guide was updated on November 3, 2026 and Work2Do Proveedor on October 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*