Trying to gain weight?
You know how it goes. You struggle to eat enough. You write another shopping list. You meal prep on Sunday and watch it die in the fridge by Wednesday. You log every bite trying to hit a surplus. And you're not even sure when this bulk is supposed to end.
JSON.fit was built by a busy skinny guy who was sick of all of that.
Answer a few questions and the app builds your week: calorie-dense meals you actually want to eat, matched to your macros, a shopping list for one shop, and a prep plan that gets the cooking done in one session. Your training plan too, built around the days you can actually train.
Bulking is simple: eat big, hit your protein, train hard. Doing it consistently around work and a real life is the hard part. JSON.fit makes eating enough the easy part, so you can hit your numbers and get back to your life.
WHAT YOU GET
- A route from your body today to your goal: when to bulk, when to cut, and roughly when you'll arrive
- Calorie-dense meals that are easy to make, with exact ingredients and every step
- Meal plans built to your bodyweight, goal and macros, in seconds
- Meals timed around your training days
- A shopping list for the whole week, with your own prices if you want a total
- A meal-prep guide that turns the week's cooking into one session
- Tracking that's ticking off planned meals, not logging every bite
- Training programs for up to a year, with session lengths you see before you start
- Rep styles to suit you, with the research on each
- Reminders at the right moments, and nothing else
- Want to tweak a plan? Customise it with ChatGPT, Claude or another AI you already use
BACKED BY RESEARCH
Every target and rule in the app traces to published studies, 62 of them, and you can read the reasoning behind each one.
YOUR DATA STAYS YOURS
No accounts. No ads. Your nutrition and workout data stays on your device unless you choose to share a plan.
BUILT BY A SKINNY GUY, FOR SKINNY GUYS
The creator uses JSON.fit to run his own bulks and cuts. The bulk/cut route, the meal rotation, the prep guide: they all exist because he needed them. Follow the plan, swap meals when you want variety, and the app tells you when to bulk, when to cut, and updates your targets as your body changes. Updates ship as he finds better ways to do it.
Download JSON.fit and stop guessing what to do next.
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