VentRef vs RTB2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VentRef
A clinical reference tool for healthcare professionals managing mechanical ventilation and oxygen therapy. It provides information grounded in respiratory physiology and evidence-based critical care.
- Mechanical ventilation reference
- Oxygen therapy reference
- Respiratory physiology
- Evidence-based critical care
- Clinical decision support
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VentRef is a focused clinical reference for clinicians managing invasive and noninvasive mechanical ventilation and oxygen therapy, grounded in core respiratory physiology and evidence-based critical care practice. This application is intended for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Calculations and reference values are derived from published peer-reviewed medical literature and textbooks cited in the Sources section of the app. Always seek the guidance of a qualified healthcare professional with any questions regarding medical conditions or clinical decisions, and do not disregard or delay seeking professional advice because of information provided by this app. About Rishi Kumar, MD, FACC ("RK.MD") I'm an adult cardiothoracic anesthesiologist and cardiovascular ICU intensivist practicing in academic medicine. I'm passionate about teaching with free, open-access medical education. Learn more on my site: https://rk.md
RTB2
This medical reference app provides respiratory therapists and students with essential clinical tools. It features ventilator mode guides, therapy calculators, and oxygen guidance in a clean, organized format for quick access in critical care settings.
- Ventilator mode reference guides
- Respiratory therapy clinical calculators
- Oxygen device guidance
- Structured respiratory care information
- Fast clinical review format
- Advanced calculators (Pro)
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RTβ₂ (RTB2) is a Respiratory Therapy reference and clinical toolset designed for Respiratory Therapists, respiratory therapy students, and healthcare professionals working in ICU and critical care environments. The app provides ventilator mode references, respiratory therapy calculators, oxygen therapy guidance, and structured respiratory care information in a clean, organized format designed for fast clinical review. The app provides organized access to commonly used Respiratory Therapy references, calculators, and ventilator information in a clean, structured format designed for quick navigation. RTB2 is built to help respiratory professionals review respiratory care concepts, ventilator modes, oxygen therapy guidance, and clinical calculations in one centralized resource. CORE FEATURES • Ventilator mode reference guides • Respiratory therapy clinical calculators • Oxygen device guidance and oxygen therapy reference • Organized respiratory care reference material • Clean layouts designed for fast navigation in clinical environments RTB2 PRO (Subscription) RTB2 Pro unlocks the full RTB2 toolset including advanced calculators, expanded Respiratory Therapy references, and ongoing clinical content updates. Pro features include: • Expanded ventilator mode explanations • Advanced respiratory therapy calculators • Expanded respiratory care reference material • Continuous updates and additional features as the platform evolves Designed for: • Respiratory Therapists • ICU and critical care clinicians • Healthcare professionals working with respiratory care • Students studying Respiratory Therapy RTB2 is intended for educational and informational purposes only. The content provided in this application is not intended to replace institutional protocols, physician orders, professional training, or clinical judgment. SUBSCRIPTION DETAILS RTB2 Pro is available as a monthly auto-renewable subscription. Payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. You can manage or cancel your subscription in your Apple ID account settings at any time. Privacy Policy https://rtb2.com/privacy Terms of Service https://rtb2.com/terms
Screenshots
Verdict
The clearest difference is in-app purchases: VentRef at none against RTB2's 1. VentRef also leads on ratings volume (42 vs 2). RTB2's advantage is update cadence (every 5 days vs every 3 weeks) and iOS requirement (15.1 vs 26.0). On price, rating, review sentiment and ads 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
Both are free to download. RTB2 sells 1 in-app purchase, starting at $2.99 per month. VentRef asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for VentRef against 5.0 for RTB2. That said, the two scores are not equally well evidenced: VentRef has 42 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.
VentRef ships an update every 3 weeks, RTB2 every 5 days. The most recent releases landed on September 23, 2026 and June 17, 2026 respectively.
| Parameter | VentRef | RTB2 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (42 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 42 — better | 2 |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 27 MB | 46 MB |
| Age rating | 17+ | 4+ |
| Developer | Rishi Kumar | Bbytetechworks LLC |
Customer experience
VentRef
RTB2
In-app purchases
VentRef
No in-app purchases
RTB2
- RTB2 Pro$2.991 Month





