# Heart Analyzer vs Duffy

The clearest difference is update cadence: Heart Analyzer at weekly against Duffy's every 5 months. Heart Analyzer also leads on ratings volume (22K vs 757). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Heart Analyzer sells 7 in-app purchases, starting at $3.99 per month and Duffy sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Heart Analyzer against 4.7 for Duffy. That said, the two scores are not equally well evidenced: Heart Analyzer has 22K ratings behind it against 757, so its average is the more settled of the two. Written reviews split almost evenly too, at 84% and 84% positive.

Heart Analyzer ships an update weekly, Duffy every 5 months. The most recent releases landed on October 18, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Heart Analyzer | Duffy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (22K ratings)](https://appshunter.io/ios/app/heart-analyzer-pulse-tracker/id1006420410/reviews) | [4.7 (757 ratings)](https://appshunter.io/ios/app/duffy-steps-complication/id1207581673/reviews) |
| Number of ratings | **22K** | 757 |
| Positive reviews | **84.2% of reviews** | 83.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 54 MB | 8 MB |
| Requires iOS | **17.5** | 18.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Helix Apps LTD](https://appshunter.io/developer/1479527439) | [Think Tank Productions](https://appshunter.io/developer/438070192) |

## What reviewers say

### Heart Analyzer

[App page](https://appshunter.io/ios/app/heart-analyzer-pulse-tracker/id1006420410)

Gain deep insights into your heart health using data from your Apple Watch. Visualize trends, analyze metrics like Cardio Recovery and Heart Rate Zones, and generate detailed PDF reports. Offers advanced features and privacy-focused data handling.

**Highlights:** Dashboard with daily summaries, Visualized heart rate and health data charts, Health vital trend assessment, Cardio Recovery and Heart Rate Zone analysis, Exportable PDF heart reports, ECG data comparison, HRV rMSSD and heart rate calibration

**Features:** Family Sharing, Apple Watch app

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Annual | $19.99 | per year |
| Data Plus | $9.99 | one-time |
| Reports Plus | $9.99 | one-time |
| Analytics Plus | $9.99 | one-time |
| Complete Premium | $24.99 | one-time |
| Lifetime Access | $49.99 | one-time |

**What reviewers like**

- 🚀 Great app for health monitoring
- 👍 Packed with useful information
- 🚀 Excellent visualizations and charts
- 👍 Easy to use and understand
- 👍 Helpful for monitoring heart conditions

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔋 Drains Apple Watch battery
- 🔍 Needs more explanation of metrics
- 🔍 Visuals could be improved for easier reading
- 🔍 Automatic updates to complications not reliable

**Reported bugs**

- Premium features not working as expected
- Syncing issues between iPhone and Apple Watch
- Oxygen level tracking not functioning properly

**Requested features**

- Add blood pressure monitoring
- Allow generating reports for current month
- Improve ECG interpretation guidance
- Add option to customize Apple Watch complications


### Duffy

[App page](https://appshunter.io/ios/app/duffy-steps-complication/id1207581673)

This app displays your daily step count directly on your Apple Watch face as a complication. It offers a full watch app for detailed stats and goal notifications, plus a companion iPhone app for deeper data analysis and trends. Access your fitness data at a glance without opening the Activity app.

**Highlights:** Watch face complication for step count, Full watch app for steps, flights, distance, Daily step goal notifications, Companion iPhone app for trends, HealthKit data integration

**Features:** Apple Watch app

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip $1 | $0.99 | one-time |
| Tip $2 | $1.99 | one-time |
| Tip $3 | $2.99 | one-time |
| Tip $5 | $4.99 | one-time |


## Frequently asked questions

### Is Heart Analyzer free?

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

### Is Duffy free?

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

### Which has better reviews, Heart Analyzer or Duffy?

Heart Analyzer and Duffy are both rated 4.7 out of 5 on the App Store, from 22K and 757 ratings respectively.

### Do Heart Analyzer or Duffy have ads?

Neither Heart Analyzer nor Duffy shows ads.

### Which is updated more often, Heart Analyzer or Duffy?

Heart Analyzer ships an update weekly, and Duffy every 5 months. Most recently, Heart Analyzer was updated on October 18, 2026 and Duffy on October 16, 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.*