# Redefine Gym.Pilates vs AlignerSilk

The clearest difference is update cadence: AlignerSilk at every 2 weeks against Redefine Gym.Pilates's every 7 months. Redefine Gym.Pilates's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Redefine Gym.Pilates ships an update every 7 months, AlignerSilk every 2 weeks. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Redefine Gym.Pilates | AlignerSilk |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/alignersilk/id6760960587/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 55 MB | 177 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [Momence, Inc.](https://appshunter.io/developer/1577856011) | [Jack Buhler](https://appshunter.io/developer/1887041637) |

## What reviewers say

### Redefine Gym.Pilates

[App page](https://appshunter.io/ios/app/redefine-gympilates/id6758223262)

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

**In-app purchases:** none


### AlignerSilk

[App page](https://appshunter.io/ios/app/alignersilk/id6760960587)

This app helps you stay on track with your clear aligner treatment. It provides tools for tracking wear time, managing trays, documenting progress with photos, and setting reminders to ensure a successful smile transformation.

**Highlights:** Wear time tracking with Live Activities, 14-day wear analytics and per-tray stats, Tray management and treatment timeline, Private, on-device photo journal, Customizable switch and out-of-mouth reminders, Privacy-focused, on-device data storage

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Redefine Gym.Pilates free?

Redefine Gym.Pilates is free to download, with no in-app purchases.

### Is AlignerSilk free?

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

### Do Redefine Gym.Pilates or AlignerSilk have ads?

Neither Redefine Gym.Pilates nor AlignerSilk shows ads.

### Which is updated more often, Redefine Gym.Pilates or AlignerSilk?

Redefine Gym.Pilates ships an update every 7 months, and AlignerSilk every 2 weeks. Most recently, Redefine Gym.Pilates was updated on October 25, 2026 and AlignerSilk on October 10, 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.*