Forge vs Stackd

Forge brings your lifting, running and daily habits together in one simple training log. STRENGTH PROGRAMS Start a cycle from proven programs: 5/3/1 and 5/3/1 Boring But Big, nSuns (4, 5 and 6 day), Greyskull LP, the Arnold Split, the Classic Menzer Cycle, Push Pull Legs and Upper Lower splits. 5/3/1 and nSuns calculate your working weights from your training maxes, rounded to the plates and barbell you actually own, in lbs or kg. Tick off sets as you go, log AMRAP reps, and watch your estimated one-rep max climb. RUNNING Follow Couch to 5K, 5K to 10K or a Half Marathon plan. Interval runs come with a guided timer that tells you when to run and when to walk. Log single runs, record race results for 5K, 10K, half and full marathon, and track your personal bests. TODAY Every day in one view: your step count from Apple Health, daily bodyweight work like push-ups and chin-ups, stretching routines, and personal challenges to tick off. PROGRESS See your consistency at a glance with activity grids for workouts, runs, step goals, daily work and stretching. Earn badges for streaks and yearly totals. Strength and running goals tick themselves off when you hit them. PRIVATE BY DESIGN Your training stays on your iPhone. Forge only reads your step count from Apple Health and never writes to it.

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.