# Chemical Engineering Formulate vs Linear System Solver

The clearest difference is in-app purchases: Linear System Solver at none against Chemical Engineering Formulate's 1. Linear System Solver also leads on update cadence (every 3 days vs every 8 months) and price ($0.99 vs $4.99). On ads and device support there is nothing between them.

Chemical Engineering Formulate costs $4.99 and Linear System Solver $0.99 up front. Chemical Engineering Formulate sells 1 one-off in-app purchase. Linear System Solver asks for nothing beyond the download.

Chemical Engineering Formulate ships an update every 8 months, Linear System Solver every 3 days. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Chemical Engineering Formulate | Linear System Solver |
| --- | --- | --- |
| Price | $4.99 | **$0.99** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 days** |
| Monetization | Paid | — |
| Size | 19 MB | 1 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Luigi Fonti](https://appshunter.io/developer/360904185) |

## What reviewers say

### Chemical Engineering Formulate

[App page](https://appshunter.io/ios/app/chemical-engineering-formulate/id354670363)

This comprehensive reference tool provides over 1,500 formulas, calculators, and conversion charts for chemical engineering professionals and students. It covers a wide range of topics including heat transfer, fluid mechanics, and reaction kinetics, with support for both US and Metric units.

**Highlights:** 1,500+ formulas and calculators, 700+ engineering calculators, US/Metric unit toggle, Dual-unit display, Searchable reference tables, Offline functionality, Save and share calculations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chemistry Pro | $3.99 | one-time |


### Linear System Solver

[App page](https://appshunter.io/ios/app/linear-system-solver/id6469396751)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chemical Engineering Formulate free?

Chemical Engineering Formulate costs $4.99, and also offers in-app purchases.

### Is Linear System Solver free?

Linear System Solver costs $0.99, with no in-app purchases.

### Do Chemical Engineering Formulate or Linear System Solver have ads?

Neither Chemical Engineering Formulate nor Linear System Solver shows ads.

### Which is updated more often, Chemical Engineering Formulate or Linear System Solver?

Chemical Engineering Formulate ships an update every 8 months, and Linear System Solver every 3 days. Most recently, Chemical Engineering Formulate was updated on October 6, 2026 and Linear System Solver on October 12, 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.*