# TPI Pro vs The Stack System

The clearest difference is in-app purchases: TPI Pro at none against The Stack System's 8. TPI Pro also leads on review sentiment (100% vs 87%) and device support (3 vs 1). The Stack System's advantage is ads (none vs shown) and ratings volume (7K vs 11). On price, rating and update cadence there is nothing between them.

Both are free to download. The Stack System sells 6 in-app purchases, starting at $9.99 per 7 days. TPI Pro asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for TPI Pro against 4.9 for The Stack System. That said, the two scores are not equally well evidenced: The Stack System has 7K ratings behind it against 11, so its average is the more settled of the two. Written reviews are what separate them: 100% of TPI Pro's written reviews are positive against 87% of The Stack System's.

TPI Pro ships an update every 2 months, The Stack System monthly. The most recent releases landed on June 11, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | TPI Pro | The Stack System |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (11 ratings)](https://appshunter.io/ios/app/tpi-pro/id1191628131/reviews) | **[4.9 (7K ratings)](https://appshunter.io/ios/app/the-stack-system/id1534757407/reviews)** |
| Number of ratings | 11 | **7K** |
| Positive reviews | **100.0% of reviews** | 87.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | **Free** | Freemium |
| Best chart rank | — | **#149** |
| Size | 39 MB | 213 MB |
| Requires iOS | **13.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [ACTPI LLC](https://appshunter.io/developer/1682118208) | [The Stack System, LP](https://appshunter.io/developer/1534757409) |

## What reviewers say

### TPI Pro

[App page](https://appshunter.io/ios/app/tpi-pro/id1191628131)

This app helps certified fitness professionals screen clients and build personalized training programs. It offers an extensive video library of exercises and allows for custom program creation and client progress tracking. Clients receive programs directly through a companion app.

**Highlights:** Client screening and assessment, Auto-generated and custom training programs, Extensive exercise video library, Client program delivery via MyTPI app, Progress tracking and program modification, Unlimited clients and video storage

**Features:** macOS Compatibility

**In-app purchases:** none


### The Stack System

[App page](https://appshunter.io/ios/app/the-stack-system/id1534757407)

**Currently charting:** #149 Top Grossing · Health & Fitness (US App Store)

Enhance your golf game with science-based training modules for speed, wedging, and putting. Improve distance, accuracy, and consistency with personalized practice sessions and detailed analytics. Requires compatible hardware.

**Highlights:** Variable inertia speed training for distance, Science-based wedge distance control, Gamified putting practice and analytics, Personalized practice sessions, Real-time scoring and insights, Customizable training modes

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stack Putting 1 Week | $9.99 | per 7 days |
| Stack Putting 1 Wk | $9.99 | per 7 days |
| TheStack Speed Training | $14.99 | per 7 days |
| TheStack Scoring Membership | $99.00 | per year |
| TheStack Speed Membership | $99.00 | per year |
| TheStack Premium Membership | $129.00 | per year |

**What reviewers like**

- 🚀 Seeing speed gains
- 👍 Easy to use app
- 👍 Motivating and helpful
- 👍 Detailed instructions
- 👍 Warmup routine

**What reviewers complain about**

- 🐛 Glitchy app (audio, dictation, timers)
- 🔧 Integration issues with other devices
- 💡 More insights and advice needed
- 🐛 Inconsistent audio/voice features
- 🐛 Occasional missing countdown

**Reported bugs**

- Putting app not working properly
- Slope percentage input issue

**Requested features**

- Calendar integration
- Music/podcast playback integration
- Apple Watch support


## Frequently asked questions

### Is TPI Pro free?

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

### Is The Stack System free?

The Stack System is free to download, with in-app purchases available.

### Which has better reviews, TPI Pro or The Stack System?

The Stack System is rated higher. TPI Pro averages 4.8 out of 5 from 11 ratings, while The Stack System averages 4.9 from 7K ratings.

### Do TPI Pro or The Stack System have ads?

TPI Pro shows ads; The Stack System does not.

### Which is updated more often, TPI Pro or The Stack System?

TPI Pro ships an update every 2 months, and The Stack System monthly. Most recently, TPI Pro was updated on June 11, 2026 and The Stack System on September 24, 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.*