# Circuit Works PRO vs Source Performance

The clearest difference is iOS requirement: Circuit Works PRO at 12.4 against Source Performance's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Circuit Works PRO ships an update every 6 weeks, Source Performance every 2 months. The most recent releases landed on September 17, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Circuit Works PRO | Source Performance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (9 ratings)](https://appshunter.io/ios/app/source-performance/id6590602459/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | — | Free |
| Size | 168 MB | 180 MB |
| Requires iOS | **12.4** | 15.1 |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Circuit Works Inc Santa Monica](https://appshunter.io/developer/1476565291) | [Source Performance LLC](https://appshunter.io/developer/1760047672) |

## What reviewers say

### Circuit Works PRO

[App page](https://appshunter.io/ios/app/circuit-works-pro/id1622881347)

**Features:** Apple Wallet

**In-app purchases:** none


### Source Performance

[App page](https://appshunter.io/ios/app/source-performance/id6590602459)

This app provides personalized workout programs and tracks your fitness journey. Monitor workouts, nutrition, habits, and measurements with coach support. Achieve your health goals with guided exercises and progress tracking.

**Highlights:** Access and track training plans, Follow exercise and workout videos, Track meals and food choices, Monitor daily habits, Set and track health goals, Message your coach in real-time, Track body measurements and progress photos

**Features:** Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Circuit Works PRO free?

Circuit Works PRO is free to download, with no in-app purchases.

### Is Source Performance free?

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

### Do Circuit Works PRO or Source Performance have ads?

Neither Circuit Works PRO nor Source Performance shows ads.

### Which is updated more often, Circuit Works PRO or Source Performance?

Circuit Works PRO ships an update every 6 weeks, and Source Performance every 2 months. Most recently, Circuit Works PRO was updated on September 17, 2026 and Source Performance on September 18, 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.*