Lifts, runs, meals and your streak, all in one app. Train live with friends, and log any of it by telling ChatGPT or Claude.
On iPhone, Android and Apple Watch.
Every set logged in a tap. Then the parts that get you back tomorrow: friends on your screen, a camera that counts, and a finish screen you'll want to screenshot.
Start a Partner Session and your friend's sets land inside your own rows the second they log them. Their numbers stay hidden, so you lift your weight, not theirs. Tilt the phone to peek, level it to hide.
Put your phone on the floor and get over it. The front camera counts every rep for sixty seconds while your squad's scores race next to yours. Nothing is recorded or sent anywhere.
Say how long you've got, what you want to hit and what's in the gym. Forge plans every exercise and set from your history and recovery, right on your phone, and rebuilds it the moment you change your mind.
Each one opens on a looping demo and the muscles it works, primary and secondary, so you never guess at a machine again.
The recovery map shades 17 muscle groups fatigued, recovering or fresh, straight from the sets you logged.
Finish a session and JustGains weighs everything you moved against something ridiculous. It knows 23 things, from a croissant to a lunar lander. Put in your number.
Runs, rides and hikes from your pocket or your wrist, and a replay worth sending to the group chat.
Finish a GPS run and tap Watch Replay. A camera flies your route between the buildings while the miles count up, and you can save it as a video. There are 12 line styles. One of them is a hot dog.
Steps, weight and heart rate come in. Your workouts, runs and meals go back out.
LiveTwo-way on Android too. Steps and heart rate in; workouts, run routes and meals out.
LiveConnect it once and the runs and rides you record there land on their own.
LiveSets on the crown, GPS runs and food by voice, with the phone left at home.
LiveActivities from your Garmin sync into your history automatically.
LiveFood and macros, minus the typing.
Take up to three photos of your meal. JustGains reads the plate and fills in the calories, protein, carbs and fat, ready to log.
Or just say it.
Or text it to Claude inside the app. It logs the meal, ticks off your water and tells you what's left for the day.
Streaks, squads and the people who notice when you skip.
Start a squad and share one invite link or a QR code. Battles, results and the trash talk land in one chat, and your streak climbs with every day you show up. Rough week? A streak freeze has your back.
Pushup Battle60-second round · just now
12 day streakLogged as a workout for all four
76% of every JustGains subscription goes to the creators each member actually trains with. Forwarded and adapted copies of your programs still credit you.
How creators earnOn iPhone, Android and Apple Watch. Bring a friend. It's better live.
Tell ChatGPT what you ate. Ask Claude for tomorrow's session. It lands in the app before you put your phone down: one JustGains server, 29 tools, and any assistant that speaks MCP.
Pick an assistant and watch a real chat play out, card and all.
Log my lunch: chicken burrito bowl with guac and a sparkling water
Saving your meal…Food diary saved
log_my_food(writes)
Lunch is in: 735 kcal, and 1,385 for the day so far.
Build me a 10-minute core burner. No equipment.
Generating workout…Workout generated
generate_workout(writes)show_workout(reads)
Five moves, ten minutes, no gear. It's saved to your account.
Build me a 45-minute push day for chest and shoulders and save it to JustGains.
Building your workout…Saved to your account
search_exercises(reads)create_workout(writes)
Push Day: Chest & Shoulders. 5 exercises, 16 sets, about 45 minutes.
That was three eggs, not two. Update breakfast.
Updating breakfast…Food diary saved
log_my_food(writes)Fixed. Breakfast now has three eggs, on the same entry, so nothing logs twice. Open in JustGains
Log my weight: 182.4 lb.
Calling JustGains…Bodyweight saved
log_my_weight(writes)Saved 182.4 lb for today. It's on your phone already.
Workouts with demo videos and every set, a food diary with the day's totals, and routes on a real map.
84 versions of the workout card so far. They follow the host's light or dark theme, in your units.
Each tool is written once. ChatGPT, Claude, Grok Bot, Muse, n8n and Zapier all call the same handler, so they can never drift apart.
/mcpChatGPT, Claude/connect/mcpCoding tools, directories/grok/mcpGrok Bot, Cursor plugin/mcp/tools/{name}Muse, n8n, scripts.NET and PostgreSQL. Writes are idempotent, so a retry never logs a meal twice.
Seconds. A private sync event tells your devices to pull the change.
Run JustGains on a schedule, from a webhook, or as a tool for an n8n AI Agent.
29 operations across 9 resources
JustGainsGet Week SummaryJustGainsBodyweight: LogJustGainsFood: Log13 triggers, actions and searches
JustGainsWorkout CompletedJustGainsActivity CompletedJustGainsGoal Completed
Listed in the Claude directory, Vercel Connect and the MCP registries. Where a listing is still in review, the setup guide works today.
The same tools over plain REST, an OpenAPI 3.1 file, and personal API keys for your own scripts.
curl https://justgains.com/mcp/tools curl https://justgains.com/mcp/openapi.json claude mcp add --transport http justgains https://justgains.com/connect/mcpWhat's new in JustGains, what changed in bro, and the tools we make along the way. Only when something ships.
You're in. Look for the build log from [email protected].
