# Prep Clock vs Hey OnTime

The clearest difference is update cadence: Prep Clock at every 4 days against Hey OnTime's monthly. Hey OnTime's advantage is iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Prep Clock sells 2 in-app purchases, starting at $2.99 per month and Hey OnTime sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Prep Clock ships an update every 4 days, Hey OnTime monthly. The most recent releases landed on September 9, 2026 and August 30, 2026 respectively.

## The numbers

| Metric | Prep Clock | Hey OnTime |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Monthly |
| Size | 16 MB | 47 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryan Tinklepaugh](https://appshunter.io/developer/1883444651) | [Wherk](https://appshunter.io/developer/1576225387) |

## What reviewers say

### Prep Clock

[App page](https://appshunter.io/ios/app/prep-clock-backward-timer/id6760279596)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Annual | $19.99 | per year |


### Hey OnTime

[App page](https://appshunter.io/ios/app/hey-ontime/id6777287206)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is Prep Clock free?

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

### Is Hey OnTime free?

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

### Do Prep Clock or Hey OnTime have ads?

Neither Prep Clock nor Hey OnTime shows ads.

### Which is updated more often, Prep Clock or Hey OnTime?

Prep Clock ships an update every 4 days, and Hey OnTime monthly. Most recently, Prep Clock was updated on September 9, 2026 and Hey OnTime on August 30, 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.*