# Fit19 vs 3E Smartphone Substudy

The clearest difference is update cadence: 3E Smartphone Substudy at every 3 weeks against Fit19's every 2 months. Fit19's advantage is device support (4 vs 2). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

Fit19 ships an update every 2 months, 3E Smartphone Substudy every 3 weeks. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Fit19 | 3E Smartphone Substudy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (926 ratings)](https://appshunter.io/ios/app/fit19/id1579097649/reviews)** | — |
| Number of ratings | **926** | — |
| Positive reviews | 20.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 173 MB | 50 MB |
| Requires iOS | **15.5** | 16.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Endo Fitness LLC](https://appshunter.io/developer/1579097651) | [Avicenna Research Inc.](https://appshunter.io/developer/1137173051) |

## What reviewers say

### Fit19

[App page](https://appshunter.io/ios/app/fit19/id1579097649)

This app helps you track workouts, measure progress, and achieve fitness goals with guidance from a certified personal trainer. It offers personalized training plans, real-time coach messaging, and integration with wearable devices.

**Highlights:** Access training plans, Track workouts and progress, Schedule workouts, Message coach in real-time, Track body measurements, Connect to wearable devices

**Features:** Apple Wallet, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Friendly staff
- 🚀 Intuitive and easy to use
- 💪 Helpful for personal training and tracking progress

**What reviewers complain about**

- 🐛 Login issues and inability to reset password
- 🐛 App crashes and freezes
- 🔍 Lack of class descriptions
- 🔒 Inability to add membership card to wallet

**Reported bugs**

- Unable to login with correct credentials
- App gets stuck on 'downloading system branding' screen
- Step tracking not syncing correctly

**Requested features**

- Copy and paste workouts to different days
- Restore ability to add membership card to wallet


### 3E Smartphone Substudy

[App page](https://appshunter.io/ios/app/3e-smartphone-substudy/id6465963006)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fit19 free?

Fit19 is free to download, with no in-app purchases.

### Is 3E Smartphone Substudy free?

3E Smartphone Substudy is free to download, with no in-app purchases.

### Do Fit19 or 3E Smartphone Substudy have ads?

Neither Fit19 nor 3E Smartphone Substudy shows ads.

### Which is updated more often, Fit19 or 3E Smartphone Substudy?

Fit19 ships an update every 2 months, and 3E Smartphone Substudy every 3 weeks. Most recently, Fit19 was updated on October 17, 2026 and 3E Smartphone Substudy on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*