# P.R.O. vs Sereno

The clearest difference is review sentiment: Sereno at 100% against P.R.O.'s 50%. Sereno also leads on update cadence (daily vs every 5 days). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. P.R.O. sells 6 in-app purchases, starting at $2.99 per month and Sereno sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

P.R.O. ships an update every 5 days, Sereno daily. The most recent releases landed on November 12, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | P.R.O. | Sereno |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/pro/id6749865568/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Daily** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 134 MB | 27 MB |
| Requires iOS | 18.5 | **17.6** |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [HAOTONG TECHNOLOGY (HK) CO., LIMITED](https://appshunter.io/developer/1876779190) | [BARBAROS SELIM BUYUKELCI](https://appshunter.io/developer/1861903946) |

## What reviewers say

### P.R.O.

[App page](https://appshunter.io/ios/app/pro/id6749865568)

This app transforms your Apple Health data into actionable insights and personalized training plans. It integrates with popular AI assistants to answer questions about your workouts and offers detailed analytics to help you understand and improve your fitness performance over time.

**Highlights:** AI-powered workout analysis, Personalized training plans, Integration with AI assistants (ChatGPT, Claude, Grok), Detailed performance charts and reports, Multi-sport tracking, Goal setting and progress tracking, Home Screen widgets

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (1 month) | $2.99 | per month |
| Pro+ (1 month) | $3.99 | per month |
| Premium (1 month) | $5.99 | per month |
| Pro | $29.99 | per year |
| Pro+ | $39.99 | per year |
| Premium | $59.99 | per year |


### Sereno

[App page](https://appshunter.io/ios/app/sereno-ai-stress-tracker/id6760587815)

This app uses AI to monitor your stress levels by analyzing data from your Apple Watch and Health app. It tracks HRV, sleep, recovery, and activity to provide real-time insights and AI-driven explanations for changes in your body. Guided breathing exercises are available for moments of high stress.

**Highlights:** AI stress monitoring, HRV, sleep, and recovery tracking, Real-time stress pattern analysis, AI-driven explanations for body changes, Guided breathing exercises, Weekly stress trend reports, Doctor-ready summaries

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sereno Premium | $3.99 | per 7 days |
| Sereno Premium | $7.99 | per month |
| Sereno Premium (Annual) | $39.99 | per year |


## Frequently asked questions

### Is P.R.O. free?

P.R.O. is free to download, with in-app purchases available.

### Is Sereno free?

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

### Do P.R.O. or Sereno have ads?

Neither P.R.O. nor Sereno shows ads.

### Which is updated more often, P.R.O. or Sereno?

P.R.O. ships an update every 5 days, and Sereno daily. Most recently, P.R.O. was updated on November 12, 2026 and Sereno 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.*