# iSup vs Chem Calc

The clearest difference is in-app purchases: iSup at none against Chem Calc's 3. iSup also leads on iOS requirement (14.0 vs 26.0). Chem Calc's advantage is update cadence (every 8 days vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. Chem Calc sells 3 in-app purchases, starting at $1.99 per month. iSup asks for nothing beyond the download.

iSup ships an update every 6 months, Chem Calc every 8 days. The most recent releases landed on October 25, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | iSup | Chem Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chem-calc/id6744528457/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 8 days** |
| Monetization | — | Free with in-app purchases |
| Size | 36 MB | 76 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Orthofix Srl](https://appshunter.io/developer/617333146) | [Fanis Kalimullin](https://appshunter.io/developer/1670198215) |

## What reviewers say

### iSup

[App page](https://appshunter.io/ios/app/isup/id1496003098)

**Features:** macOS Compatibility

**In-app purchases:** none


### Chem Calc

[App page](https://appshunter.io/ios/app/chem-calc/id6744528457)

This app provides a comprehensive suite of tools for chemistry calculations, including equation balancing, molar mass computation, and gas law solutions. It features an interactive periodic table and works offline for most functions, making it ideal for students and professionals.

**Highlights:** Interactive Periodic Table with element properties, Reaction search and automatic equation balancing, Molar mass calculator with detailed breakdown, pH and Acid–Base calculations, Ideal Gas Law solver, Concentration and dilution tools, Calculation history and unit converter

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro subscription (1 Month) | $1.99 | per month |
| Premium Yearly (1 year) | $19.99 | per year |
| Premium | $5.99 | one-time |


## Frequently asked questions

### Is iSup free?

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

### Is Chem Calc free?

Chem Calc is free to download, with in-app purchases available.

### Do iSup or Chem Calc have ads?

Neither iSup nor Chem Calc shows ads.

### Which is updated more often, iSup or Chem Calc?

iSup ships an update every 6 months, and Chem Calc every 8 days. Most recently, iSup was updated on October 25, 2026 and Chem Calc on October 11, 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.*