Stackd vs ArfiFit

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.

ArfiFit is a clean, focused workout planner for bodyweight training and running — no gym, no equipment, no sign-up required. PLAN YOUR WEEK Build workouts in seconds from a library of proven movements — pull-ups, push-ups, dips, squats, lunges, crunches, planks, warm-ups and running. Set reps, time, or distance per exercise, and lay them out across a simple calendar. TRAIN WITHOUT FRICTION A distraction-free workout screen logs every set with one tap. Built-in rest timer keeps you moving between sets, and timed exercises like planks get their own countdown — no second app, no stopwatch. AI COACH Not sure what to do today? Tell the AI your focus (strength, cardio, recovery or mixed) and how long you have. It builds a balanced session tailored to your profile in seconds. Includes free plans every month. SEE REAL PROGRESS Track total volume, personal bests, streaks and monthly trends with clear charts. Earn 28 achievements as you build the habit — from your first workout to a 100-day streak. PRIVATE BY DESIGN Your data lives on your device. No account, no ads, no tracking. The only thing sent to our server is what you choose to share when generating an AI plan. Start today — your first workout is one tap away.