Lean · 薄肌 FAQ
Features, pricing, privacy and the pull-up exam — answered.
Product & pricing
What is Lean · 薄肌?
Lean · 薄肌 (also known as LumaFit) is an iPhone fitness app that keeps strength-training logs, food and calories, water and sleep in one daily view, with an on-device pull-up counting exam, L0–L6 strength ranks, playful Lean degree certificates and an optional AI coach.
Is Lean free?
Yes. It is a free download and every non-AI feature is free, including plans, logging, stats, manual meal logging and calorie math, water and sleep, the pull-up exam, export and optional iCloud sync. You also get 2 free AI text chats a day. LumaFIT Pro is a monthly or yearly auto-renewing subscription for more AI features; prices are shown in the App Store.
Which devices are supported? Is there an Android version?
iPhone with iOS 18 or later. It is currently available on the China mainland App Store. There is no Android version yet.
Do I need an account?
No. All free features work without an account, and purchasing or restoring Pro does not require sign-in. Sign in with Apple is optional.
Training & the pull-up exam
How does the pull-up exam count reps?
Prop your iPhone facing the bar; the camera tracks joint landmarks in real time and only full reps count as “Valid +1”. Front and rear cameras are supported. Accuracy depends on lighting, framing and visibility.
Does the exam record or upload video?
No. Pose detection runs entirely on your iPhone. Frames are not recorded or uploaded.
How many pull-ups for each Lean degree?
Lean Bachelor: 6 consecutive bodyweight reps. Boshi: 15 consecutive reps with a logged body weight of at least 60 kg. Lean Postdoc: 20 consecutive bodyweight reps. Degrees are in-app entertainment achievements, not academic or professional qualifications.
Can I build my own program?
Yes. Manual templates need neither AI nor Pro: pick exercises, sets, rep range, starting weight and rest, then save.
Food, AI & privacy
How accurate are AI photo calorie estimates?
They are estimates of food, portion, calories and macros, affected by angle, hidden portions and cooking method. Lean asks you to review and edit before saving — treat it as a fast starting point, not a kitchen scale.
Which AI model does the coach use, and who receives my data?
Online AI requests go through the LumaFit cloud proxy to the official DeepSeek API. Before anything is sent, the app names the recipient and the data involved and asks for consent. Guidance is general fitness reference, not medical advice.
Where is my data stored?
Workout history stays on your iPhone by default. iCloud sync is free and optional, and you can delete server-side account data from the Account screen.
How do I cancel LumaFIT Pro?
In your App Store account settings, or via Manage Subscription in the app’s Pro screen or Settings. Cancel at least 24 hours before the period ends to avoid renewal. Deleting your Lean account does not cancel the subscription.