# Structural Formulas Study vs CBQA

Structural Formulas Study and CBQA are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Structural Formulas Study ships an update every 5 weeks, CBQA every 2 months. The most recent releases landed on September 20, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Structural Formulas Study | CBQA |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Size | 5 MB | 38 MB |
| Requires iOS | **18.4** | 18.5 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Jun Yamabe](https://appshunter.io/developer/1732682049) | [Mariano Pazos Afonso](https://appshunter.io/developer/788547472) |

## What reviewers say

### Structural Formulas Study

[App page](https://appshunter.io/ios/app/structural-formulas-study/id6752260162)

**Features:** macOS Compatibility

**In-app purchases:** none


### CBQA

[App page](https://appshunter.io/ios/app/cbqa/id6752497070)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Structural Formulas Study free?

Structural Formulas Study is free to download, with no in-app purchases.

### Is CBQA free?

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

### Do Structural Formulas Study or CBQA have ads?

Neither Structural Formulas Study nor CBQA shows ads.

### Which is updated more often, Structural Formulas Study or CBQA?

Structural Formulas Study ships an update every 5 weeks, and CBQA every 2 months. Most recently, Structural Formulas Study was updated on September 20, 2026 and CBQA on September 10, 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.*