# FunctionRx vs Deep Core

The clearest difference is in-app purchases: FunctionRx at none against Deep Core's 7. FunctionRx also leads on device support (3 vs 1) and iOS requirement (15.1 vs 18.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Deep Core sells 7 one-off in-app purchases. FunctionRx asks for nothing beyond the download.

FunctionRx ships an update every 10 days, Deep Core every 2 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | FunctionRx | Deep Core |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/deep-core-breathing-and-posture/id6761623256/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 39 MB | 28 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [FunctionRx LLC](https://appshunter.io/developer/1866412339) | [Jonathan Buchan](https://appshunter.io/developer/1890504350) |

## What reviewers say

### FunctionRx

[App page](https://appshunter.io/ios/app/functionrx/id6757368981)

**In-app purchases:** none


### Deep Core

[App page](https://appshunter.io/ios/app/deep-core-breathing-and-posture/id6761623256)

This app focuses on strengthening your deep core muscles, essential for spinal stability and pain prevention. It uses guided breathwork exercises that require no equipment and can be done in just five minutes daily. Build a stronger, more stable core from the inside out.

**Highlights:** Guided breathwork drills, Hands-free operation, Targets deep core muscles, Daily habit building companion, Private data sync via iCloud, Research-backed exercises

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Donation | $1.99 | one-time |
| Medium Donation | $2.99 | one-time |
| Winter Beanie Outfit | $2.99 | one-time |
| Fall Beanie Outfit | $2.99 | one-time |
| Summer Beanie Outfit | $2.99 | one-time |
| Spring Beanie Outfit | $2.99 | one-time |
| Large Donation | $3.99 | one-time |


## Frequently asked questions

### Is FunctionRx free?

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

### Is Deep Core free?

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

### Do FunctionRx or Deep Core have ads?

Neither FunctionRx nor Deep Core shows ads.

### Which is updated more often, FunctionRx or Deep Core?

FunctionRx ships an update every 10 days, and Deep Core every 2 weeks. Most recently, FunctionRx was updated on October 31, 2026 and Deep Core 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.*