Comparison

ReViiV vs TachyMon

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

Head to head
About

ReViiV

This app offers customized daily breathing exercises designed to alleviate post-viral symptoms like fatigue, brain fog, and loss of taste/smell. It utilizes scientifically backed techniques across 16 progressive stages to promote steady improvement and symptom relief.

Highlights
  • Customized daily breathing exercises
  • 16 progressive stages for improvement
  • Relief from fatigue, brain fog, taste/smell loss
  • 8 scientifically backed techniques
  • Weekly progress assessments and graphs
  • Detailed guides and technique resources
Features
Read full description

** Rapid Long-Haul Relief ** Experience fast relief from your Long-Haul / Post-Viral symptoms with ReViiV, a breakthrough app offering customized daily exercises designed to treat common Long-Haul symptoms. Imagine less fatigue, clearer thinking, and the return of taste/smell, often starting within 24 hours – all possible through our custom breathing program. Featuring 8 scientifically backed techniques fused into simple, daily exercises, this is more than deep breaths; it's about continuous improvement and reclaiming your health. (View the Full Medical Paper: https://tinyurl.com/mukdb2cc) ** Steady Improvement over 16 Stages ** ReViiV is designed to quickly relieve many common Long-Haul (PASC) symptoms, including Fatigue, Taste/Smell loss, Breathlessness, “Brain Fog’, Muscle/Joint pain, Insomnia, and more. ReViiV uses 5-minute daily breathing exercises, progressively tailored to your needs, to both relieve symptoms and facilitate steady, incremental improvement over 16 stages. Weekly assessments and graphs show your progress along with visual aids, detailed guides, and resources to ensure proper technique. ** Featuring 8 Scientifically Backed Techniques ** Drawing from the latest Long-Haul (PASC) research, as well as respiratory and cognitive-behavioral therapy, ReViiV's effectiveness stems from 8 scientifically backed techniques fused into a highly effective breathing program: 1. Nasal Breathing: ReViiV promotes nasal breathing 24/7 to increase the efficiency of your lungs, improve oxygen intake, reduce fatigue, and help restore taste & smell. 2. Prolonged Exhalation: By emphasizing long exhales, ReViiV aims to reduce breathlessness, relax your body, improve your sleep, and improve lung function. 3. Diaphragm Activation: ReViiV encourages deep 'belly breathing' to improve your lung function, reduce fatigue and shortness of breath. By stimulating the nervous system, it also reduces stress and anxiety, enhancing well-being. 4. Oxygen/CO2 Regulation: ReViiV aims to improve your lung capacity and balance the levels of oxygen and CO2 in your body by fostering the Bohr Effect, helping to alleviate symptoms like fatigue, breathlessness, and ‘brain fog’. 5. Regulated Immune System: ReViiV's breathing exercises are designed to keep your immune system in check, reducing inflammation and other immune-related symptoms often seen in Long-Haulers. 6. Olfactory Re-training: ReViiV incorporates specific exercises that can enhance your sensitivity to smell and taste, especially useful for Long-Haulers. 7. Breath-Holding: When you're ready, ReViiV introduces daily breath-holding exercises to help your body adapt to higher CO2 levels, improving overall body efficiency. 8. Stress Reduction and Mindfulness: ReViiV includes mindfulness techniques to help reduce fatigue, improve sleep, and combat stress, anxiety, and depression. ** Key Features & Functionality ** • Safe, 100% natural Long-Haul breathing therapy, requiring just minutes a day. • Harness 8 potent techniques for rapid Long-Haul symptom relief and ongoing improvement. • Benefits often noticeable within 24 hours. • Weekly assessments and graphs to measure and track your progress. • Progressive 16-stage guided program with three intensity levels. • Auto-adjusts exercise intensity based on your progress. • Co-created by a Long-Hauler along with leading post-viral research and trials. • Multiple breath counters and countdown timers within a user-friendly interface. • Access to additional Long-Haul resources, guides and tips to ensure you're on the right track. • Daily exercises tailored for morning focus, afternoon energy, and evening relaxation. Download ReViiV FREE Now! ** For More Information ** - How ReViiV Works: https://reviiv.me/howitworks - Full Medical Paper: https://tinyurl.com/mukdb2cc Terms of use: https://www.Apple.com/legal/internet-services/itunes/dev/stdeula/

About

TachyMon

Receive immediate alerts for significant heart rate fluctuations, ideal for conditions like POTS or during exercise. Customize thresholds and receive detailed event tracking. Premium features offer advanced data visualization and reporting.

Highlights
  • Customizable heart rate threshold alerts
  • Haptic feedback for alerts
  • Real-time heart rate and average display
  • Alert event tracking and logging
  • Temporary alert silencing
  • Detailed monitoring data review
  • Shareable PDF reports (premium)
Features
Read full description

Get rapid alerts for significant heart rate changes due to POTS, tachycardia, exercise or other activities. Features: - Haptic alerts based on custom threshold levels. - Customizable upper and lower threshold levels for current heart rate and difference from recent average. - The main display shows: current heart rate, moving average of recent heart rate, and delta of current heart rate to average. - Display colors change to show severity of alert. - The app tracks alert events with start time of event, event duration, starting average heart rate, and maximum or minimum heart rate during event. - Triple tap to temporarily silence alerts. - Review detailed monitoring data on the companion iPhone app. Premium features: - View detailed heart rate chart for each event - Share event info directly from watch, or export from iPhone to Photos app - Run monitoring sessions directly on your iPhone, without an Apple Watch, by connecting a Bluetooth heart rate sensor - Generate a shareable PDF report for each session - Add notes and symptoms to Alert Events - Export Alert Event raw heart rate data to .csv - View live session data on the iPhone companion app - View a summary of Alert Events over last week / month / year TachyMon was created by the developer for his niece Alex, who was diagnosed with Postural Orthostatic Tachycardia Syndrome (POTS) in the fall of 2021. Alex was experiencing frequent fainting, and her family noticed the episodes often followed a rapid rise in her heart rate. She wanted a heads-up the moment that started happening. Alex uses TachyMon's alerts as a cue to sit or crouch down when her heart rate climbs quickly, and she finds the app helps her feel a bit more in control of her day. It is a simple but specialized app, and we hope it may help others with POTS, or anyone who wants to be alerted to changes in their heart rate. APPLE HEALTH TachyMon integrates with the Apple Health app. TachyMon stores workout information (including heart rate) with the Apple Health app. WARNING: It is important to consult with medical professionals if you are concerned about your health. The TachyMon app is intended for informational purposes only. It is not a substitute for specialized medical care. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

ReViiV4 screens
TachyMon4 screens

Verdict

The call

The clearest difference is rating: ReViiV at 4.5 against TachyMon's 3.8. ReViiV also leads on review sentiment (75% vs 58%) and update cadence (monthly vs every 3 months). TachyMon's advantage is ratings volume (288 vs 8). On price, ads, in-app purchases and monetization model 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. ReViiV sells 2 in-app purchases, starting at $0.99 per month and TachyMon sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

ReViiV holds the better App Store score, 4.5 against 3.8. That said, the two scores are not equally well evidenced: TachyMon has 288 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 75% of ReViiV's written reviews are positive against 58% of TachyMon's.

UpkeepUpdate frequency

ReViiV ships an update monthly, TachyMon every 3 months. Both last shipped on November 3, 2026.

Scorecard5 real differences · 5 level
ReViiV versus TachyMon: the parameters behind the verdict, then further details
ParameterReViiVTachyMon
PriceFreeFree
Rating4.5 (8 ratings) — better3.8 (288 ratings)
Positive reviews75.0% of reviews — better58.0% of reviews
Number of ratings8288 — better
Update frequencyMonthly — betterEvery 3 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS13.0 — better16.4
Further details — not scored
Size25 MB36 MB
Age rating12+9+
DeveloperMartysoft LLCWhip Development Inc.

Customer experience

ReViiV

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

TachyMon

All ratings286 ratings
Positive69.2%
Neutral5.2%
Negative25.5%
Written reviews207 reviews
Positive58.0%
Neutral13.0%
Negative29.0%

Bugs and requests

ReViiV

Not enough reviews yet to summarise bugs or requests.

TachyMon

Reported bugs

4 issues
  • Frequent disconnections from heart rate monitor
  • Inconsistent data sync between watch and phone
  • Inability to reinstall app on new devices
  • Freezing and crashing issues on latest updates

Requested features

5 requests
  • Add ability to log symptoms and notes
  • Implement emergency contact alerts
  • Improve data export and sharing options
  • Enhance graphing and trend analysis tools
  • Optimize battery usage and background monitoring

In-app purchases

2 purchases

ReViiV

Subscriptions2
  • Long Haul Breathing Therapy3 Days trial$0.991 Month
  • Long Haul Breathing Therapy3 Days trial$6.991 Year
2 purchases

TachyMon

Subscriptions2
  • TachyMon Premium Monthly1 Month trial$2.991 Month
  • TachyMon Premium Annual1 Month trial$19.991 Year

Questions

Is ReViiV free?
ReViiV is free to download, with in-app purchases available.
Is TachyMon free?
TachyMon is free to download, with in-app purchases available.
Which has better reviews, ReViiV or TachyMon?
ReViiV is rated higher. ReViiV averages 4.5 out of 5 from 8 ratings, while TachyMon averages 3.8 from 288 ratings.
Do ReViiV or TachyMon have ads?
Neither ReViiV nor TachyMon shows ads.
Which is updated more often, ReViiV or TachyMon?
ReViiV ships an update monthly, and TachyMon every 3 months. Most recently, ReViiV was updated on November 3, 2026 and TachyMon on November 3, 2026.

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