# Chemical Engineering Formulate vs Stuff | ToDos and Lists

The clearest difference is review sentiment: Stuff | ToDos and Lists at 86% against Chemical Engineering Formulate's 0%. Stuff | ToDos and Lists also leads on price (Free vs $4.99) and update cadence (every 10 days vs every 8 months). Chemical Engineering Formulate's advantage is iOS requirement (18.6 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

Stuff | ToDos and Lists is free to download; Chemical Engineering Formulate costs $4.99 up front. Chemical Engineering Formulate sells 1 one-off in-app purchase and Stuff | ToDos and Lists sells 9 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Chemical Engineering Formulate ships an update every 8 months, Stuff | ToDos and Lists every 10 days. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Chemical Engineering Formulate | Stuff | ToDos and Lists |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.5 (85 ratings)](https://appshunter.io/ios/app/stuff-todos-and-lists/id6502721156/reviews)** |
| Number of ratings | — | **85** |
| Positive reviews | 0.0% of reviews | **86.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 10 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 19 MB | 212 MB |
| Requires iOS | **18.6** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [2196, LLC](https://appshunter.io/developer/1464074692) |

## 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 |


### Stuff | ToDos and Lists

[App page](https://appshunter.io/ios/app/stuff-todos-and-lists/id6502721156)

Organize your life and achieve goals with a powerful task management system. Create interconnected lists, manage dependencies, and collaborate on shared projects. Track progress and stay focused on daily priorities.

**Highlights:** Task dependencies, Interconnected lists, Shared lists for collaboration, Progress tracking (Adventure Log), Today Card for daily priorities, Someday Tasks and repeating tasks, Home screen widgets

**Features:** Family Sharing, Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extra Stuff \| Monthly | $2.99 | per month |
| Extra Stuff | $29.99 | per year |
| Extra Stuff \| Yearly | $29.99 | per year |
| Level 1 Tip | $0.99 | one-time |
| Level 2 Tip | $4.99 | one-time |
| Level 3 Tip | $9.99 | one-time |
| Level 4 Tip | $19.99 | one-time |
| Level 5 Tip | $39.99 | one-time |
| Extra Stuff Lifetime | $119.99 | one-time |


## Frequently asked questions

### Is Chemical Engineering Formulate free?

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

### Is Stuff | ToDos and Lists free?

Stuff | ToDos and Lists is free to download, with in-app purchases available.

### Do Chemical Engineering Formulate or Stuff | ToDos and Lists have ads?

Neither Chemical Engineering Formulate nor Stuff | ToDos and Lists shows ads.

### Which is updated more often, Chemical Engineering Formulate or Stuff | ToDos and Lists?

Chemical Engineering Formulate ships an update every 8 months, and Stuff | ToDos and Lists every 10 days. Most recently, Chemical Engineering Formulate was updated on October 23, 2026 and Stuff | ToDos and Lists on October 25, 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.*