Now on the App Store for iOS

You already have the AI.
We do the rest.

You're already paying for AI — why pay for it twice? Use ChatGPT, Claude, or Gemini — the AI you already have. Import personalised workout programs and meal plans in seconds. Track everything.

Download Free

Free workouts forever · Nutrition unlock $9.99 USD one-time · ⚡ Launch pricing

Works with ChatGPT Claude Gemini DeepSeek + any AI
Your training, handled

Stop second-guessing
every decision.

How many sets per muscle group? What training split fits my schedule? How many reps for progressive overload? How long do I rest between sets? When do I take rest days?

Every answer, personalised to you.
Every detail handled. Just train.

And it's completely free.
How It Works

Three steps. Infinite plans.

We build the prompt. You choose the AI. It's that simple.

01 — Quick Setup

Answer a few questions

Goals, schedule, experience, preferences. We build a perfect prompt customised for you.

02 — Send to Any AI

ChatGPT, Claude, Gemini

Paste the prompt, get a structured plan back in seconds. Whatever AI you like.

03 — Import & Train

Paste or upload the result

Your program loads instantly — every set, rep, meal, and macro ready to track.

The App
JSON.fit splash screen
Import AI workout program
Track every set and rep
Import AI meal plan
Track every meal and macro

Workout imports are free. Forever.

Import unlimited AI-generated workout programs. Track every exercise, set, rep, and weight. Multi-mesocycle programs up to 48 weeks. No paywall, no limits.

Download Free
$0
Your nutrition, sorted

Stop overthinking
every meal.

What macros should I hit for my weight and goals? What exactly do I buy at the shops? What do I meal prep on Sunday? I've got leftover chicken and rice — how do I use it? I only have a microwave and slow cooker — what can I make? What time should I eat each meal?

Your perfect macros every day. Exactly what to buy. Exactly what to cook. Pay once, never think about it again.

Unlock for $9.99 USD

Your AI Nutritionist Is Ready.

Effortless eating, engineered for you.

🧬

AI Macro Engine

Precision protein, carbs, fat & fibre targets calibrated to your body and goals.

🛒

Smart Grocery Lists

Exact shopping lists. No confusion at the shops.

📋

Meal Prep Blueprints

Step-by-step meal prep instructions for the week ahead.

🌙

Sleep-Synced Timing

Meal times optimised around your sleep for better recovery and energy.

🥡

Pantry Intelligence

Tell it what's in your fridge. Get plans that use what you already have.

💰

Nutrition For Everyone

Dietitian-level personalisation. Unlimited plan changes. No appointments.

Compare

Premium nutrition. Accessible pricing.

Personalisation that used to require a professional — now available to everyone.

JSON.fit
Dietitian
Other Apps
Typical cost
$9.99 once
$150–300/session
$20–60/mo
Expert-level personalisation
Basic
Instant access
Weeks wait
Unlimited plan changes
Grocery lists
Meal prep guidance
No ongoing fees
AI provider choice
Yours
N/A
Locked in
⚡ Limited Time — Launch Pricing

Workouts free.
Unlock nutrition.

$9.99 USD · one time

Own forever · No subscription

Free: Unlimited AI workout imports
Free: Full program & set tracking
Free: No ads. Ever.

AI meal plan generation & import
Macro tracking & daily timeline
Smart grocery lists & pantry intelligence
Sleep-synced meal timing
Works with ChatGPT, Claude, Gemini & more
Download on the App Store
FAQ

Common questions.

How does it actually work?
The app builds a structured prompt based on your goals, schedule, and preferences. You copy it into any AI you already use — ChatGPT, Claude, Gemini, whatever. The AI generates a personalised plan. You paste the result back into JSON.fit and it loads instantly, ready to track.
Do I need to pay for AI separately?
Most AI chatbots have a free tier that works perfectly — ChatGPT, Gemini, and others all offer free access. If you're already paying for a premium AI subscription, even better. Either way, JSON.fit itself has no AI costs to pass on to you.
How much does JSON.fit cost?
Workouts are free forever — no paywall, no limits. Nutrition features (meal plans, macro tracking, grocery lists, meal prep, pantry intelligence) are a one-time $9.99 USD purchase. No subscription. You pay once and own it forever.
Why is it so much cheaper than other apps?
Most fitness apps charge $10–20/month because they run AI on their servers. JSON.fit uses the AI you already have, so there are no server costs to pass on to you. That's why workouts are free and nutrition is a one-time purchase.
What AI does it work with?
Any AI that can generate structured text — ChatGPT, Claude, Gemini, DeepSeek, and more. You're not locked into one provider. Use whatever you prefer.
Is my data private?
Yes. Your data stays on your device. JSON.fit doesn't have accounts, doesn't collect personal information, and doesn't send your workout or nutrition data anywhere.
Is it available on Android?
Not yet — it's currently iOS only. Android is in development. You can tap "I want it on Android" on this site to let us know there's demand.
Noted — Android is coming!