RESERVE: Metabolic HUD

Your metabolism, made visible

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

You're ~2,540 kcal from the next pound down — about 3 days at your pace. Not a number on a scale, but a finish line you watch yourself close, in real time. Every weight app shows you a number. RESERVE shows you your position — exactly how close you are to the next pound coming off, closing in real time. Not "you weigh 184." You're about 2,500 kcal from the next pound down, a few days out at your pace. That distance is the whole point: a finish line you can watch yourself reach, instead of a number that just sits there. HOW IT WORKS • A living orb shows your metabolism at a glance — it fills when you eat and drains as you burn, so you can watch your body flip from burning food to burning fat. • The ring around the orb IS the pound you're on. As your body oxidizes fat, it drains — you literally see the gap to the next pound close. • A hero bar shows how far through the current pound you are, and it moves the moment you log a deficit or a workout. BUILT BY A PHYSICIAN, HONEST BY DESIGN • It learns your REAL daily burn from your own data — not a textbook formula's guess. • When the scale jumps up, it stays quiet. Early-morning weight is mostly water, and a doctor wouldn't scold you for it — so the app doesn't either. • After time away, it tells you what it didn't see instead of inventing numbers. YOURS ALONE • 100% on-device — no account, no server, no ads. Your data can't leave your phone. • One-tap export of everything you own. • Charts you can HEAR (Apple Audio Graphs) for blind and low-vision users. • A pregnancy mode that hides the scale entirely and talks about the week ahead. Free. Built solo, over a year, by a San Diego physician. RESERVE is a motivational tool, not a medical device.

  • 5.0
    out of 5
    1 Ratings

THE POUND BAR — see exactly how close you are. Your home screen now leads with the one thing other trackers hide: your position. A living bar fills toward your next pound down, and a bright segment jumps forward the moment you log a deficit or a workout — so you watch yourself close the gap in real time. Not "you weigh 184." You're ~2,540 kcal from the next pound, a few days out. Also in 1.3: • The whole app re-centered on that idea — from the first screen to the gauge around the orb. • Smoother, more game-like unlocks as your journey opens up. • Polish and fixes throughout. Free, 100% on-device, no account. Built by a physician.

The developer, Brian Khan Quintana, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer has not yet indicated which accessibility features this app supports. Learn More

Seller
  • Brian Khan Quintana
Size
  • 14.9 MB
Category
  • Health & Fitness
Compatibility
Requires iOS 26.0 or later.
  • iPhone
    Requires iOS 26.0 or later.
  • Mac
    Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 26.0 or later.
Languages
English and 5 more
  • English, French, German, Japanese, Simplified Chinese, Spanish
Age Rating
9+
Copyright
  • © 2026 Brian Khan Quintana