GainDay

GainDay makes gaining weight simple. Tell it your current weight, how much you want to gain, and by when — GainDay estimates how many calories to eat each day, then counts them down as you log your food.

Built for hardgainers, athletes, and anyone who struggles to eat enough.

YOUR DAILY NUMBER • Personalized calorie target from the widely used Mifflin-St Jeor formula: your maintenance calories plus the exact surplus for your goal • Set your goal in pounds and weeks — GainDay does the math and shows your pace • Meal reminders every 2, 3, or 4 hours between the times you choose — eating often is how you hit a surplus • Under-eating alert: get warned any day you finish below maintenance, before it costs you progress • 7-day calorie average so one bad day never hides the real trend • Protein target sized to your body weight for muscle gain

LOG FOOD IN SECONDS • Scan any barcode — instant nutrition for millions of packaged products • Search the USDA food database plus millions of branded foods • Calorie-dense foods are flagged with a flame so you can spot the best gaining picks at a glance • Favorites and Recent sections learn what you actually eat • 36 built-in high-calorie snack and meal ideas, from trail mix to chicken alfredo • Add your own custom foods — saved on your device forever • Forgot to log? Page back up to 7 days and fill in any day

WATCH YOURSELF GROW • Log weigh-ins in seconds • Weight trend chart over the week, month, or year • See your actual lb/week pace versus your goal pace, with a heads-up when you're falling behind • Progress bar from your starting weight to your goal

SIMPLE, PRIVATE, NO SUBSCRIPTIONS • Every feature included — no premium tier, no locked charts, no upsells • No account, no sign-up, no ads • All your data stays on your device

Whether you're bulking for muscle, putting weight back on, or just trying to eat more, GainDay keeps it effortless.

Food data from USDA FoodData Central and Open Food Facts.

Note: GainDay provides general nutrition information and is not medical advice. Calorie and nutrition values are estimates. Consult a healthcare professional before making significant changes to your diet, especially if you have a history of an eating disorder or other medical condition.