BioSteer vs Rello
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BioSteer
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BioSteer combines molecular and physical medical exams to determine your biological age and aging pace. Routine measurements of biological age give you the ability to understand how your lifestyle affects your biological age, and has the added benefit of efficient preventative medicine and a longer health span. Disclaimer: The information provided by BioSteer is for general informational purposes only. All information in the app is provided in good faith, however, we make no representation or warranty of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, availability, or completeness of any information in the app. Under no circumstance shall we have any liability to you for any loss or damage of any kind incurred as a result of the use of the app or reliance on any information provided in the app. Your use of the app and your reliance on any information in the app is solely at your own risk. This app does not offer medical advice. The content provided through BioSteer is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in this app.
Rello
Track your sleep, vitals, and activity to understand how they impact your well-being. Identify personal trends and build healthier habits for a longer, more vibrant life. All your health data remains private and on your device.
- Sleep tracking and analysis
- Vitals monitoring
- Activity and workout tracking
- Personalized trend identification
- On-device data privacy
- Goal achievement monitoring
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Rello is an app that makes it easier to track your sleep, vitals, and activity data for use with your Apple Watch: • Discover how your sleep and activity affect your vitals and how you feel each day. • Learn what's normal for you and when your body needs rest to recover. • See how much you move, work out, and get outside to reach your goals • Recognize trends and patterns to identify what's working for you. • Build sustainable practices that lead to a longer and healthier life. Absolute Privacy: • Health data stays on device and is never stored or shared online Coming Soon: • Additional sleep metrics • More detailed status indicators • Long term trends and statistics • Detail and insights into workouts Better Together • Your feedback will shape Rello’s future. Reach out anytime to sam@rello.app to help make Rello better for you and the entire Rello community. Free Trial • Rello offers a 7-day trial for new users Rello is not for medical use or intended to diagnose, treat, cure, monitor, or prevent medical conditions or illnesses. Rello is only designed for general fitness and wellness purposes. Terms of Service: https://www.rello.app/terms Privacy Policy: https://www.rello.app/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: BioSteer at none against Rello's 2. BioSteer also leads on update cadence (every 2 weeks vs monthly) and device support (3 vs 1). On price 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. Rello sells 2 in-app purchases, starting at $2.99 per month. BioSteer asks for nothing beyond the download.
BioSteer ships an update every 2 weeks, Rello monthly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.
| Parameter | BioSteer | Rello |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 2 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.5 — better | 17.6 |
| Further details — not scored | ||
| Size | 123 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | Centarix Biotech Ltd. | Sam Malapas |
In-app purchases
BioSteer
No in-app purchases
Rello
- Subscription (Monthly)7 Days trial$2.991 Month
- Subscription (Yearly)7 Days trial$24.991 Year









