# iSwear Jar vs Prep Clock

The clearest difference is update cadence: Prep Clock at every 5 days against iSwear Jar's every 3 weeks. iSwear Jar's advantage is iOS requirement (16.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. iSwear Jar sells 1 one-off in-app purchase and Prep Clock sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

iSwear Jar ships an update every 3 weeks, Prep Clock every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | iSwear Jar | Prep Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/iswear-jar/id1633852599/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 17 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Alterscope Solutions LLC](https://appshunter.io/developer/1551052588) | [Ryan Tinklepaugh](https://appshunter.io/developer/1883444651) |

## What reviewers say

### iSwear Jar

[App page](https://appshunter.io/ios/app/iswear-jar/id1633852599)

This app helps you break bad habits and build good ones using a Ulysses Pact. You set monetary penalties for slip-ups, encouraging accountability and change. Celebrate successes with virtual gold stars.

**Highlights:** Habit creation and destruction, Monetary penalty system, Ulysses Pact technique, Accountability on the go, Complete privacy, Success celebration with gold stars

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Slip Up Penalty | $0.99 | one-time |


### 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 |


## Frequently asked questions

### Is iSwear Jar free?

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

### Is Prep Clock free?

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

### Do iSwear Jar or Prep Clock have ads?

Neither iSwear Jar nor Prep Clock shows ads.

### Which is updated more often, iSwear Jar or Prep Clock?

iSwear Jar ships an update every 3 weeks, and Prep Clock every 5 days. Most recently, iSwear Jar was updated on November 3, 2026 and Prep Clock on October 31, 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.*