Comparison

Physiological Sigh vs NapCraft

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

Head to head
About

Physiological Sigh

This app guides you through a scientifically proven breathing technique to quickly calm your nervous system and reduce stress. It requires no prior meditation experience and offers customizable durations and ambient sounds for a personalized experience.

Highlights
  • Guided breathing exercises
  • Customizable phase durations
  • Ambient sound library
  • Daily reminder notifications
  • Distraction-free interface
  • Haptic feedback
Features
Read full description

Calm your nervous system in seconds. Physiological Sigh is a science-backed breathing app built around the fastest stress-relief technique ever studied. No meditation experience required. No complicated programs. Just three simple phases, and you'll feel the difference in under 30 seconds. WHAT IS THE PHYSIOLOGICAL SIGH? The physiological sigh is a natural reflex your body already performs — spontaneously, during deep sleep — to re-oxygenate your lungs and reset your nervous system. Stanford neuroscientist Andrew Huberman and his team discovered that triggering this reflex voluntarily is the single most effective real-time tool for reducing stress and anxiety. It works in one cycle. It works anywhere. And it works immediately. HOW IT WORKS Each cycle consists of three phases: A short inhale through the nose A second, longer inhale through the nose to fully inflate your lungs A long, slow exhale through the mouth That's it. One cycle takes less than 9 seconds. A full 5-minute session delivers lasting effects on your heart rate, cortisol levels, and overall sense of calm. WHY THIS APP Most breathing apps ask you to follow complex programs or sit through lengthy guided sessions before you feel anything. This app does one thing, and does it exceptionally well. We built it around the physiological sigh specifically because the science is clear: of all real-time stress-reduction techniques studied, this one produces the fastest and most measurable results. No guesswork, no filler. FEATURES Animated breathing disc that guides you through each phase in real time Phase card showing exactly where you are in the cycle Elapsed and remaining time counter Customizable phase durations — adjust each inhale and exhale to your comfort Session length from 1 to 30 minutes Ambient sound library — rain, ocean waves, fireplace, white noise, singing bowls, and more Custom backgrounds — choose the atmosphere that helps you focus Haptic feedback with a distinct pattern for each phase Daily reminder notifications — up to 3 scheduled reminders per day Clean, distraction-free interface designed for daily use BACKED BY SCIENCE The physiological sigh has been studied since the 1930s and brought into mainstream wellness by researchers at Stanford University. A 2023 study published in Cell Reports Medicine found that cyclic sighing practiced for 5 minutes daily produced greater improvements in mood and reductions in stress than other breathing techniques and mindfulness meditation. This app puts that research directly in your hands. PERFECT FOR Moments of acute stress or anxiety Pre-meeting nerves or public speaking Winding down before sleep Resetting after an intense workout Building a daily mindfulness habit without the time commitment SIMPLE BY DESIGN Open the app. Press play. Breathe. That's the entire experience. No account required to get started, no onboarding questionnaire, no streak pressure. Just a tool that works when you need it. Start your first session today. Your nervous system will thank you. Physiological Sigh is not a medical device and is not intended to diagnose, treat, or prevent any medical condition. If you experience anxiety disorders or other health conditions, please consult a qualified healthcare professional. - Terms Of Use : https://occirama.com/physiological-sigh/terms-of-use/ - Privacy Policy : https://occirama.com/physiological-sigh/privacy/

About

NapCraft

Features
Read full description

NapCraft is a science-based power-nap timer with gentle wake alarms that help you recharge without the grogginess. Pick a nap length, drift off, and wake up before you slip into deep sleep. FREE - 10 and 20 minute nap presets - 3 gentle alarm sounds - 7-day nap history NAPCRAFT PREMIUM - $2.99/month - All presets (10 / 20 / 26 / 90 min) plus custom durations - Full gentle-sound library - Unlimited nap history - Apple Health sync - Energy tracking - rate your energy before and after each nap - Nap IQ - a personal nap coach that learns your best nap length and time of day from your own history Auto-renews monthly. Cancel anytime in your Apple ID settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://tabishapps.com/privacy-policy.html

Screenshots

Physiological Sigh4 screens
NapCraft4 screens

Verdict

The call

The clearest difference is ads: Physiological Sigh at none against NapCraft's shown. Physiological Sigh also leads on update cadence (every 3 days vs monthly). NapCraft's advantage is iOS requirement (17.0 vs 26.2). On price, 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

Both are free to download. Physiological Sigh sells 2 in-app purchases, starting at $2.99 per month and NapCraft sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Physiological Sigh ships an update every 3 days, NapCraft monthly. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

Scorecard3 real differences · 7 level
Physiological Sigh versus NapCraft: the parameters behind the verdict, then further details
ParameterPhysiological SighNapCraft
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 days — betterMonthly
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.217.0 — better
Further details — not scored
Size43 MB14 MB
Age rating17+4+
Developeremmanuel orvainTabish Hassan

In-app purchases

2 purchases

Physiological Sigh

Subscriptions2
  • Premium Account / Month$2.991 Month
  • Premium Account / Year$9.991 Year
3 purchases

NapCraft

Subscriptions2
  • Premium Monthly$2.991 Month
  • NapCraft Premium Yearly$29.991 Year
One-time1
  • Premium Lifetime$49.99

Questions

Is Physiological Sigh free?
Physiological Sigh is free to download, with in-app purchases available.
Is NapCraft free?
NapCraft is free to download, with in-app purchases available.
Do Physiological Sigh or NapCraft have ads?
NapCraft shows ads; Physiological Sigh does not.
Which is updated more often, Physiological Sigh or NapCraft?
Physiological Sigh ships an update every 3 days, and NapCraft monthly. Most recently, Physiological Sigh was updated on October 31, 2026 and NapCraft on November 5, 2026.

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