Comparison

HRV4Biofeedback vs PickX

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
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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

PickX

Features
Read full description

Transform Your Notion into a Decision-Making Machine Ever struggled to choose what to eat for dinner? Which movie to watch? Which task to tackle first? Pickx turns your Notion databases into instant decision makers with a single tap. Random Selection, Reinvented Pickx seamlessly connects with your Notion workspace, letting you pick random items from any database you choose. Whether it's restaurants, movies, books, project ideas, or daily tasks—just tap the button and let fate decide. Why You'll Love Pickx • Choose Your Adventure – Select from any of your Notion databases Perfect For → Foodies – Can't decide where to eat? Let your restaurant list decide → Movie Buffs – Random movie night from your watchlist → Productivity Enthusiasts – Break decision paralysis on your task list → Content Creators – Pick your next content topic randomly → Travelers – Choose your next destination spontaneously → Book Lovers – Let your reading list surprise you → Anyone – Who wants to add a little randomness to life How It Works 1. Connect – Authenticate with your Notion account securely 2. Select – Choose which databases you want to pick from 3. Pick – Tap the button and get your random item instantly 4. Enjoy – That's it! No complicated setup, no learning curve Smart & Simple Pickx respects the minimalist philosophy of Notion itself. No overwhelming features, no cluttered interface—just the functionality you need, beautifully executed. What Makes Pickx Different Unlike other random picker apps, Pickx integrates directly with your existing Notion workflow. No manual copying of lists, no duplicate data entry, no sync issues. Your Notion database is your source of truth, and Pickx makes it interactive. Built by People Who Use Notion Daily We understand your workflow because we live it. Pickx was born from our own need to make quick, random decisions from our carefully curated Notion databases. Pickx is an independent app and is not affiliated with, endorsed by, or sponsored by Notion Labs, Inc.

Screenshots

HRV4Biofeedback4 screens
PickX4 screens

Verdict

The call

The clearest difference is price: PickX at Free against HRV4Biofeedback's $9.99. HRV4Biofeedback's advantage is chart position (#38 vs unranked). On update cadence, ads, in-app purchases and device support 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

PickX is free to download; HRV4Biofeedback costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 9 level
HRV4Biofeedback versus PickX: the parameters behind the verdict, then further details
ParameterHRV4BiofeedbackPickX
Price$9.99Free — better
Rating3.4 (30 ratings) — better—
Positive reviews53.1% of reviews—
Number of ratings30 — better—
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
Best chart rank#38 — better—
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.615.1 — better
Further details — not scored
Size138 MB28 MB
Age rating4+4+
DeveloperA.S.M.A. B.V.Juon Kawakami

In-app purchases

None

HRV4Biofeedback

No in-app purchases

None

PickX

No in-app purchases

Questions

Is HRV4Biofeedback free?
HRV4Biofeedback costs $9.99, with no in-app purchases.
Is PickX free?
PickX is free to download, with no in-app purchases.
Do HRV4Biofeedback or PickX have ads?
Neither HRV4Biofeedback nor PickX shows ads.
Which is updated more often, HRV4Biofeedback or PickX?
HRV4Biofeedback ships an update every 2 months, and PickX every 2 months. Most recently, HRV4Biofeedback was updated on November 3, 2026 and PickX on October 31, 2026.

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