On-device AI
Apple's Foundation Models generate plans and resolve tricky progression calls — privately, on your iPhone.
Villain Arc is an iOS strength-training platform that goes past rep tracking — reusable plans, guided logging, and progression suggestions from deterministic training rules plus on-device AI. Built and shipped by FCT, live on the App Store.
Plan the split, log the session, and let the app tell you what to do next time — grounded in your real history.
A hybrid suggestion engine handles common progression with deterministic rules and hands the ambiguous calls to on-device AI with confidence gating. Then it tracks the outcome — scoring each accepted suggestion across later sessions as good, too aggressive, too easy, or ignored.
Most trackers stop at the log. Villain Arc keeps going into the next decision, and checks its own work.
Villain Arc uses the Apple platform the way a native app should — on-device intelligence, system surfaces, and your data staying yours.
Apple's Foundation Models generate plans and resolve tricky progression calls — privately, on your iPhone.
Start a workout, log a lift, or pull your trends just by asking — 10 App Shortcuts ship in.
Your active set, rest timer, and cardio live on the Lock Screen and Dynamic Island.
Today's workout and your streak, one glance from the Home Screen.
Two-way HealthKit sync for workouts, weight, sleep, steps, heart rate, and energy.
Search any exercise from Spotlight; iCloud keeps plans and history across your devices.
The latest release leans into on-device intelligence and rounds out the health picture.
Yes — Villain Arc is free to download from the App Store and free to use for planning splits, logging workouts, tracking your weight and steps, and reviewing your training history. Villain Arc Pro is the paid upgrade that unlocks the intelligence layer: AI plan generation that builds a full program from one sentence, smart set suggestions that recommend your next weight and reps, AI exercise replacement, and the deeper health insights like performance correlations and sleep-timing trends. The core training experience — reusable plans, guided set logging, rest timers, split scheduling, and Apple Health sync — stays free, so you can run real training before deciding Pro is worth it. Villain Arc is built and maintained by FCT Technologies, runs on iOS, and is currently on version 1.3. There are no ads and no account to create — you download it, start a workout, and your data is yours from the first set.
Most workout apps stop at the log — they record what you lifted and leave the next decision to you. Villain Arc keeps going. Its hybrid suggestion engine handles common progression with deterministic training rules and hands the ambiguous calls to Apple's on-device AI with confidence gating, so every recommendation stays explainable rather than a black box. Then it does something most trackers do not: it scores the outcome, grading each accepted suggestion across later sessions as good, too aggressive, too easy, or ignored, so the coaching gets sharper the longer you train. The whole workout lifecycle is state-driven — pending, active, summary, done — which means an interrupted session resumes exactly where you left off, even from Siri or a widget. It is built for every lifter, and the structure rewards anyone training seriously: real rep ranges, rest policies, split schedules, and progression that checks its own work.
All of your workout, plan, profile, and health data lives on your iPhone in a local SwiftData store — FCT Technologies does not host it or keep a copy on company servers. If you turn on iCloud, the same data syncs privately across your own devices through your Apple account using CloudKit, and the app still works fully offline if you leave iCloud off. The AI features work the same way: plan generation and progression calls use Apple's on-device Foundation Models, so nothing about your training is sent to an external service to be processed. Apple Health sync is two-way and permission-gated — you choose which categories Villain Arc can read and write, and you can change that anytime in iOS Settings. To delete everything, remove the app from your device; if iCloud sync was on, signing out of iCloud clears the cloud copy too. Your training data stays yours, on hardware you control.
Villain Arc is free to start, with Villain Arc Pro for AI plans, smart suggestions, and the deeper health insights.