# Chemist Calc vs Search PubChem

The clearest difference is in-app purchases: Search PubChem at none against Chemist Calc's 1. Search PubChem also leads on ratings volume (5 vs 1) and device support (4 vs 2). Chemist Calc's advantage is iOS requirement (16.0 vs 26.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Chemist Calc sells 1 one-off in-app purchase. Search PubChem asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Chemist Calc against 5.0 for Search PubChem. That said, the two scores are not equally well evidenced: Search PubChem has 5 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 9 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | Chemist Calc | Search PubChem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/chemist-calc/id1052603017/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/search-pubchem/id1369742632/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 months | Every 9 months |
| Monetization | Free | Free |
| Size | 11 MB | 9 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 17+ |
| Developer | [ilan TETRUASHVILI](https://appshunter.io/developer/940821251) | [Jae-Seung Lee](https://appshunter.io/developer/1146296876) |

## What reviewers say

### Chemist Calc

[App page](https://appshunter.io/ios/app/chemist-calc/id1052603017)

This app serves as a smart chemistry calculator for converting between moles and grams. It also provides a comprehensive periodic table with element specifications and unit conversion tools.

**Highlights:** Mole to gram conversion, Gram to mole conversion, Periodic table with element specifications, Unit conversion, Learn chemistry signs

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ad's | $0.99 | one-time |


### Search PubChem

[App page](https://appshunter.io/ios/app/search-pubchem/id1369742632)

Access and manage chemical compound data from the PubChem database. Search for over 111 million compounds, view molecular formulas, weights, and structures, and create and track custom solutions with detailed composition information.

**Highlights:** Search PubChem database, View molecular formula, weight, and structure, Store compound information, Create and manage custom solutions, Track solution composition in grams and moles, Display 3D compound structures, Share solution data via CSV

**In-app purchases:** none


## Frequently asked questions

### Is Chemist Calc free?

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

### Is Search PubChem free?

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

### Which has better reviews, Chemist Calc or Search PubChem?

Chemist Calc and Search PubChem are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.

### Do Chemist Calc or Search PubChem have ads?

Neither Chemist Calc nor Search PubChem shows ads.

### Which is updated more often, Chemist Calc or Search PubChem?

Chemist Calc ships an update every 9 months, and Search PubChem every 9 months. Most recently, Chemist Calc was updated on November 2, 2026 and Search PubChem on November 2, 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.*