# equivalence principle vs MasterNow

The clearest difference is in-app purchases: equivalence principle at none against MasterNow's 4. equivalence principle also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. MasterNow sells 4 in-app purchases, starting at $19.99 per 7 days. equivalence principle asks for nothing beyond the download.

## The numbers

| Metric | equivalence principle | MasterNow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Size | 0 MB | 58 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [Total Cyber Tech (Private) Limited](https://appshunter.io/developer/1883683055) |

## What reviewers say

### equivalence principle

[App page](https://appshunter.io/ios/app/equivalence-principle/id6670335382)

**Features:** macOS Compatibility

**In-app purchases:** none


### MasterNow

[App page](https://appshunter.io/ios/app/masternow/id6760295557)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access Weekly | $19.99 | per 7 days |
| Full Access Monthly | $49.99 | per month |
| Full Access 6 Months | $99.99 | per 6 months |
| Full Access Yearly | $149.99 | per year |


## Frequently asked questions

### Is equivalence principle free?

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

### Is MasterNow free?

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

### Do equivalence principle or MasterNow have ads?

MasterNow shows ads; equivalence principle does not.

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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.*