# BIDMASter vs Calculus Formulas

The clearest difference is in-app purchases: BIDMASter at none against Calculus Formulas's 3. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Calculus Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. BIDMASter asks for nothing beyond the download.

## The numbers

| Metric | BIDMASter | Calculus Formulas |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 days | — |
| Size | 2 MB | 48 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Philip Hazelwood](https://appshunter.io/developer/1626264984) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## What reviewers say

### BIDMASter

[App page](https://appshunter.io/ios/app/bidmaster/id1634432607)

**In-app purchases:** none


### Calculus Formulas

[App page](https://appshunter.io/ios/app/calculus-formulas-calcref/id6761394165)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| CalcRef Yearly Premium | $44.99 | per year |
| CalcRef Premium Lifetime | $74.99 | one-time |


## Frequently asked questions

### Is BIDMASter free?

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

### Is Calculus Formulas free?

Calculus Formulas is free to download, with in-app purchases available.

### Do BIDMASter or Calculus Formulas have ads?

Neither BIDMASter nor Calculus Formulas shows ads.

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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.*