# Prep AI vs Callday

The clearest difference is iOS requirement: Callday at 15.1 against Prep AI's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Prep AI sells 1 in-app purchase, starting at $9.99 per 7 days and Callday sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

Prep AI ships an update weekly, Callday every 8 days. The most recent releases landed on October 4, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Prep AI | Callday |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 8 days |
| Size | 12 MB | 49 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HamiltonZell, LLC](https://appshunter.io/developer/1726427066) | [Jan-Erik Bettermann](https://appshunter.io/developer/1896451196) |

## What reviewers say

### Prep AI

[App page](https://appshunter.io/ios/app/prep-ai-interview-practice/id6742364023)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access | $9.99 | per 7 days |


### Callday

[App page](https://appshunter.io/ios/app/callday-cold-calling/id6767268376)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Callday Pro | $14.99 | per month |
| Callday Pro | $119.00 | per year |


## Frequently asked questions

### Is Prep AI free?

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

### Is Callday free?

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

### Do Prep AI or Callday have ads?

Neither Prep AI nor Callday shows ads.

### Which is updated more often, Prep AI or Callday?

Prep AI ships an update weekly, and Callday every 8 days. Most recently, Prep AI was updated on October 4, 2026 and Callday on October 11, 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.*