# Python PTS vs Carlisle Core

The clearest difference is in-app purchases: Carlisle Core at none against Python PTS's 1. Python PTS's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Python PTS sells 1 one-off in-app purchase. Carlisle Core asks for nothing beyond the download.

Python PTS ships an update every 3 weeks, Carlisle Core monthly. The most recent releases landed on September 23, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Python PTS | Carlisle Core |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (9 ratings)](https://appshunter.io/ios/app/python-pts-interval-timer/id1252192713/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free | — |
| Size | 23 MB | 120 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zachary Makar](https://appshunter.io/developer/1252192712) | [DeM Fitness & Wellness, LLC](https://appshunter.io/developer/1682494657) |

## What reviewers say

### Python PTS

[App page](https://appshunter.io/ios/app/python-pts-interval-timer/id1252192713)

This advanced fitness app uses haptic and audio cues to keep you aware of workout times without needing to look at a screen. It intelligently adjusts timer speeds to push you harder and integrates with Apple Health to track vital metrics.

**Highlights:** Haptic and audio workout timers, Intelligent timer speed adjustments, Multiple difficulty levels, Apple Health integration, Heart rate tracking, Calorie and distance tracking

**Features:** Siri integration

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Python PTS Unlock Key | $4.99 | one-time |


### Carlisle Core

[App page](https://appshunter.io/ios/app/carlisle-core/id6447762419)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Python PTS free?

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

### Is Carlisle Core free?

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

### Do Python PTS or Carlisle Core have ads?

Carlisle Core shows ads; Python PTS does not.

### Which is updated more often, Python PTS or Carlisle Core?

Python PTS ships an update every 3 weeks, and Carlisle Core monthly. Most recently, Python PTS was updated on September 23, 2026 and Carlisle Core on October 1, 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.*