# Infidelity ER vs Fast2Book

The clearest difference is in-app purchases: Fast2Book at none against Infidelity ER's 1. Infidelity ER's advantage is iOS requirement (12.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Infidelity ER sells 1 in-app purchase, starting at $7.99 per month. Fast2Book asks for nothing beyond the download.

Infidelity ER ships an update every 2 months, Fast2Book every 3 months. The most recent releases landed on October 15, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Infidelity ER | Fast2Book |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fast2book/id6745785902/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | — | Free |
| Size | 39 MB | 65 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Relationskonsulten Stockholm AB](https://appshunter.io/developer/1486595564) | [Innovestech](https://appshunter.io/developer/1813857179) |

## 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 |


### Fast2Book

[App page](https://appshunter.io/ios/app/fast2book/id6745785902)

Instantly book appointments with doctors, salons, caterers, and more. This app offers real-time availability, instant confirmations, and secure payments. Save time and avoid phone calls by booking services anytime, anywhere.

**Highlights:** Instant booking for various services, Real-time availability, Instant confirmations, Secure payments, Service reminders, View professional reviews

**In-app purchases:** none


## Frequently asked questions

### Is Infidelity ER free?

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

### Is Fast2Book free?

Fast2Book is free to download, with no in-app purchases.

### Do Infidelity ER or Fast2Book have ads?

Neither Infidelity ER nor Fast2Book shows ads.

### Which is updated more often, Infidelity ER or Fast2Book?

Infidelity ER ships an update every 2 months, and Fast2Book every 3 months. Most recently, Infidelity ER was updated on October 15, 2026 and Fast2Book on September 24, 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.*