System3
Solutions at the Intersection of Health, Technology, and Sports Performance
Lifting EE
Determining energy expenditure for weight lifting sessions is a tricky problem, and even lab testing has its challenges. Our app incorporates a model that's got one of the best correlations across different movements and body sizes. Just enter a few details about your physique, and your sets, reps, and weight, and we'll do the rest.For customer support, just use the email contact icon at the bottom of this page.
EF Analyzer
Coming Soon - share your FIT files and we deliver an AI agent that can answer questions about your data. Inspired by our founder's interest in Efficiency Factor, the ratio of Normalized Power to average heart rate.
You are not the Product
Our apps are free or reasonably priced. We're not here to mine your data and we don't share it with anyone, for any reason.
Simple is Better
Complexity is the enemy of compliance. Long term compliance is the key to health and performance.
No Gimics, Just Solid Science
We don't engage in BS to meet some VC's growth expectations. We base our solutions on a solid foundation and let the product speak for itself.
Rapid Delivery
We specialize in simple, functional solutions delivered through the radical advances in AI and deep domain knowledge in wearables, metabolism, and sport performance. Don't see what you're looking for? Use the email icon at the bottom to send us product requests or ideas.
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Lifting EE Privacy PolicyEffective date: October 1, 2026
Publisher: System3, LLCLifting EE estimates energy expenditure from resistance training. We respect your privacy and do not sell your personal information.Information you enterThe app uses the age, sex, body measurements, and workout details you enter to calculate estimates. This information is processed and stored on your device. It is not transmitted to us or shared by the app with third parties.The app does not require an account and does not include advertising, tracking, analytics services, or access to Apple Health.Storage and deletionYour information remains on your device until you change it or delete the app. To remove the app’s locally stored information, delete the app rather than offloading it.
Your device backups may include app data, depending on your Apple settings. Restoring a backup may restore that data. We cannot access or delete your device backups.Support requestsIf you contact us, we receive the information you choose to provide, such as your email address and message. We use it to respond and resolve your request, and retain it only as long as reasonably necessary for those purposes or as required by law. Our email provider processes these communications to deliver and store them. Please avoid sending sensitive body or workout information.Payments and other servicesIf we offer a paid app or subscriptions through the App Store, Apple processes those payments. We do not receive your full payment-card details.
Apple’s App Store, backup, and diagnostic services operate under Apple’s privacy policies and your settings. External websites opened through research links have their own privacy policies.Changes to this policyWe may update this policy as the app changes and will update the effective date. If future features change how personal information is handled, we will explain those changes and request consent where required.ContactFor privacy questions or requests concerning information you have sent us, contact [email protected].