Stackd vs Quiet Iron

Training phases change. Work gets busy. Goals shift. Most fitness apps lock you into their programs. Stackd works with whatever plan you built this week — because your AI agent writes it, and Stackd just keeps score. IMPORT AI WORKOUTS IN SECONDS Design your program in any AI agent. Copy the JSON. Paste it into Stackd. Your full workout plan appears instantly — exercises, sets, rep targets, everything. No manual entry. No templates. No friction. TRACK EVERY SESSION Log sets, reps, and weight as you train. Stackd auto-fills your last session's weight so you always have a starting point. Hit your rep targets and the weight recommendation updates automatically — progressive overload built in. SEE YOUR STRENGTH GROW Estimated 1-rep max charts for every exercise. Watch your squat, bench, and deadlift climb week over week. Full session history so you never lose a workout. NUTRITION TRACKING INCLUDED Log meals and hit your macro targets without switching apps. Build daily meal plans, track protein, carbs, and fat. Everything in one place. BUILT FOR LIFTERS WHO PLAN WITH AI Most fitness apps want to sell you their programs. Stackd assumes you already know how to use AI Agents to build a better one. We just give those programs a home. No ads. No upsells inside the app. Cancel anytime.

Quiet Iron is a workout logger for people who'd rather train than deal with a difficult app. No streaks. No feed. No notifications begging you to come back. Just a proven plan and the fastest way to log a set — then you put the phone down and lift. A PLAN THAT'S ALREADY FIGURED OUT Pick a science-backed 4-day upper/lower split and start. It's the structure research keeps pointing to for building muscle — every muscle trained twice a week — so there's nothing to design. THE BARBELL DOES THE MATH Enter the weight per side and see the loaded total instantly, plates and all. Slide the bar open to view both sides, switch between per-side and total, and set your own bar weight. No more plate arithmetic mid-set. LOG A SET IN SECONDS Press a number, swipe to change it, done. Your weight and reps carry over from your last set — and your last session — so usually you just confirm and move on. Step back to fix an earlier set anytime. YOURS ALONE No account, no sign-up, no cloud. Everything you log stays on your iPhone. Quiet Iron has no servers and collects nothing — there's nothing to leak and no one watching. Calm by design. Built for iPhone.