# HRV4Biofeedback vs DiaryBam?!

The clearest difference is price: DiaryBam?! at Free against HRV4Biofeedback's $9.99. DiaryBam?! also leads on update cadence (daily vs every 2 months). HRV4Biofeedback's advantage is in-app purchases (none vs 6) and chart position (#35 vs unranked). On ads, device support and iOS requirement there is nothing between them.

DiaryBam?! is free to download; HRV4Biofeedback costs $9.99 up front. DiaryBam?! sells 6 in-app purchases, starting at $6.99 per month. HRV4Biofeedback asks for nothing beyond the download.

HRV4Biofeedback ships an update every 2 months, DiaryBam?! daily. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | HRV4Biofeedback | DiaryBam?! |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[3.4 (30 ratings)](https://appshunter.io/ios/app/hrv4biofeedback/id1504638613/reviews)** | — |
| Number of ratings | **30** | — |
| Positive reviews | 53.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free | — |
| Best chart rank | **#35** | — |
| Size | 138 MB | 42 MB |
| Requires iOS | **15.6** | 16 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [A.S.M.A. B.V.](https://appshunter.io/developer/1066843463) | [The Boggler Inc.](https://appshunter.io/developer/6788566622) |

## What reviewers say

### HRV4Biofeedback

[App page](https://appshunter.io/ios/app/hrv4biofeedback/id1504638613)

**Currently charting:** #35 Top Paid · Lifestyle (US App Store)

This app uses your phone's camera to measure heart rate variability and provide biofeedback. It guides you through deep breathing exercises to improve self-regulation and manage stress. Track your progress and explore correlations with your daily experiences.

**Highlights:** Camera-based HRV measurement, Real-time heart rate feedback, Resonant frequency analysis, Biofeedback score, Subjective annotations, HealthKit integration, Bluetooth sensor support

**Features:** Vision Pro support

**In-app purchases:** none


### DiaryBam?!

[App page](https://appshunter.io/ios/app/diarybam/id6788566620)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Guide Monthly | $6.99 | per month |
| 2 Urnle Credits | $2.99 | one-time |
| 3 Urnle Credits | $4.99 | one-time |
| 10 Urnle Credits | $14.99 | one-time |
| 20 Urnle Credits | $29.99 | one-time |
| 35 Diary!? Credits | $49.99 | one-time |


## Frequently asked questions

### Is HRV4Biofeedback free?

HRV4Biofeedback costs $9.99, with no in-app purchases.

### Is DiaryBam?! free?

DiaryBam?! is free to download, with in-app purchases available.

### Do HRV4Biofeedback or DiaryBam?! have ads?

Neither HRV4Biofeedback nor DiaryBam?! shows ads.

### Which is updated more often, HRV4Biofeedback or DiaryBam?!?

HRV4Biofeedback ships an update every 2 months, and DiaryBam?! daily. Most recently, HRV4Biofeedback was updated on November 3, 2026 and DiaryBam?! on November 5, 2026.

---

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