# Training Stack vs Bivryn Biological Intelligence

The clearest difference is update cadence: Bivryn Biological Intelligence at every 11 days against Training Stack's every 3 months. Bivryn Biological Intelligence also leads on iOS requirement (17.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Training Stack sells 3 in-app purchases, starting at $4.99 per month and Bivryn Biological Intelligence sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

Training Stack ships an update every 3 months, Bivryn Biological Intelligence every 11 days. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Training Stack | Bivryn Biological Intelligence |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/training-stack/id6757607761/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 11 days** |
| Monetization | Freemium | — |
| Size | 26 MB | 24 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Raven Howard](https://appshunter.io/developer/1867818110) | [Amita Dhand](https://appshunter.io/developer/1437246199) |

## What reviewers say

### Training Stack

[App page](https://appshunter.io/ios/app/training-stack/id6757607761)

This app consolidates running, strength training, and short exercise bursts into a single platform. It allows users to import training plans, track progress with detailed analytics, and integrate with health data. Personalize your fitness journey with customizable plans and shareable progress reports.

**Highlights:** Import running and strength training plans, Track running, strength, and exercise snacks, Apple Health integration for automatic syncing, Detailed running and strength analytics, Customizable strength training with 400+ exercises, Widgets and Live Activities for quick access, Weather integration for optimized runs

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Stacker - Monthly | $4.99 | per month |
| Pro Stacker - Annual | $19.99 | per year |
| Pro Stacker - Believer | $99.99 | one-time |


### Bivryn Biological Intelligence

[App page](https://appshunter.io/ios/app/bivryn-biological-intelligence/id6774502017)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bivryn Premium Monthly | $14.99 | per month |
| Bivryn Premium Annual | $99.99 | per year |


## Frequently asked questions

### Is Training Stack free?

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

### Is Bivryn Biological Intelligence free?

Bivryn Biological Intelligence is free to download, with in-app purchases available.

### Do Training Stack or Bivryn Biological Intelligence have ads?

Neither Training Stack nor Bivryn Biological Intelligence shows ads.

### Which is updated more often, Training Stack or Bivryn Biological Intelligence?

Training Stack ships an update every 3 months, and Bivryn Biological Intelligence every 11 days. Most recently, Training Stack was updated on October 8, 2026 and Bivryn Biological Intelligence on October 13, 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.*