Comparison

HRV4Biofeedback vs DiaryBam?!

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HRV4Biofeedback

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
Currently charting
Read full description

Improve self-regulation and better cope with stress using HRV4Biofeedback, the camera-based Heart Rate Variability (HRV) Biofeedback app APP FEATURES: > camera-based biofeedback measurement showing real-time heart rate > spot check measurements at rest > frequency power spectrum > biofeedback score to quantify the effectiveness of the practice in terms of deep breathing and duration > resonant frequency analysis to determine the optimal breathing rate for your sessions > semi-real time HRV analysis > alternative manual breathing rate configuration between 4.5 and 8.5 breaths / minute > subjective annotations, including up to 5 personalized questions > current streak > explore correlations between subjective annotations and biofeedback data > Integration with HealthKit (you can write heart rate, HRV and Mindful minutes) > weekly and monthly summaries > support for Bluetooth sensors > background nature sounds > vibration to guide you through the practice WHAT'S BIOFEEDBACK? Heart Rate Variability (HRV) Biofeedback is a technique that can directly affect physiological and psychological factors through deep breathing exercises and is an ideal strategy to help us self-regulate and better cope with stressful situations​ Practically speaking, HRV Biofeedback consists of providing an individual with real-time feedback on instantaneous heart rate and respiration changes while being instructed to breathe at low frequencies You can learn more about the psychological and physiological benefits of deep breathing and HRV Biofeedback, at HRV4Biofeedback.com HOW CAN I BENEFIT FROM BIOFEEDBACK? Life can be demanding, from both a physical and psychological point of view ​Our health and performance can be affected by how we are able to effectively cope with stressful situations and deal with anxiety, or in broader terms, our ability to emotionally self-regulate is key The goal of HRV Biofeedback is to improve self-regulation, therefore impacting positively our health and performance LEARN MORE: - App features: https://www.hrv4biofeedback.com/faq.html - An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback - How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements Supported devices for the camera measurement: iPhones 8 and onwards HRV4Biofeedback requires to register an account with your email address, so that your data can be backed up safely and retrieved in case anything happens (app issue, changing phone, etc.) The validation of the camera-based heart rate measurement is available here: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

About

DiaryBam?!

Features
Read full description

Some thoughts need more room than a post. DiaryBam?! gives them a place to live. Write about your day, record a voice note, add photos or videos, save a link, or talk things through with your own AI reflection companion. Keep entries and conversations together so you can return to what mattered. Your journal starts private. Create separate journals for different parts of your life, or make a Bubble journal with people you invite. Each member chooses who can see their posts. You can also find a human Guide by topic and location, invite someone you know, or connect with a Guide from another journal. You decide whether to share your entries with a Guide. When you want to share more widely, publish a chosen entry or saved conversation as a page. You control whether it welcomes public guidance and which insights appear. Gurnle AI can help you reflect through conversation and entry insights. It is not a source of diagnosis, therapy, or instructions for how to live. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Additional Terms of Use: https://urnle.com/terms-of-use Privacy Policy: https://urnle.com/privacy-policy

Screenshots

HRV4Biofeedback4 screens
DiaryBam?!4 screens

Verdict

The call

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 (#38 vs unranked). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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

Scorecard4 real differences · 7 level
HRV4Biofeedback versus DiaryBam?!: the parameters behind the verdict, then further details
ParameterHRV4BiofeedbackDiaryBam?!
Price$9.99Free — better
Rating3.4 (30 ratings) — better—
Positive reviews53.1% of reviews—
Number of ratings30 — better—
Update frequencyEvery 2 monthsDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
Best chart rank#38 — better—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.6 — better16
Further details — not scored
Size138 MB42 MB
Age rating4+17+
DeveloperA.S.M.A. B.V.The Boggler Inc.

In-app purchases

None

HRV4Biofeedback

No in-app purchases

6 purchases

DiaryBam?!

Subscriptions1
  • AI Guide Monthly1 Month trial$6.991 Month
One-time5
  • 2 Urnle Credits$2.99
  • 3 Urnle Credits$4.99
  • 10 Urnle Credits$14.99
Show 2 more
  • 20 Urnle Credits$29.99
  • 35 Diary!? Credits$49.99

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.

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