# Infidelity ER vs BUP app

The clearest difference is in-app purchases: BUP app at none against Infidelity ER's 1. BUP app also leads on update cadence (every 3 weeks vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Infidelity ER sells 1 in-app purchase, starting at $7.99 per month. BUP app asks for nothing beyond the download.

Infidelity ER ships an update every 2 months, BUP app every 3 weeks. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Infidelity ER | BUP app |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 39 MB | 50 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Relationskonsulten Stockholm AB](https://appshunter.io/developer/1486595564) | [Landstinget i Uppsala län](https://appshunter.io/developer/885812554) |

## What reviewers say

### Infidelity ER

[App page](https://appshunter.io/ios/app/infidelity-er/id1486595565)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ER Infidelity subscription | $7.99 | per month |


### BUP app

[App page](https://appshunter.io/ios/app/bup-app/id6740796188)

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

**In-app purchases:** none


## Frequently asked questions

### Is Infidelity ER free?

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

### Is BUP app free?

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

### Do Infidelity ER or BUP app have ads?

Neither Infidelity ER nor BUP app shows ads.

### Which is updated more often, Infidelity ER or BUP app?

Infidelity ER ships an update every 2 months, and BUP app every 3 weeks. Most recently, Infidelity ER was updated on September 10, 2026 and BUP app on September 9, 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.*