AI calculates your calorie burn, your deficit, and your macro targets from your body metrics. You snap a meal, scan a barcode, or type a sentence. The math is done. The deficit is honest.
Sets, reps, volume, RPE, and PRs in a structured history that feeds reports automatically.
Weekly volume viewBy movement
Connect.
Wins, meals, and training clips beside the data that proves they happened.
+12
Report.
Weekly recaps that read like a coach's note. Calories, volume, adherence, body trend, and what to do next.
Weekly recapRead in 60s
Mascot demos
Every movement, demonstrated.
27 hand-built animated demos cover free weights, stations, and bodyweight work. The old man shows the form, you match it. Drawn for clarity, not stock-footage filler.
Barbell back squatLegsLat pulldownBackBiceps curlArms
27 demos ship in the app, attached to every plan exercise and workout log.
The AI coach
Reads everything. Says two sentences.
The coach reads meals, workouts, body weight, sleep, and the running deficit, then answers in short, grounded reads. Calm, specific, never preachy.
Daily read
Protein landed within 8g of target and the deficit is on pace. One more lifting session keeps the week green.
Grounded in today's meals + workout
Weekly recap
Pull volume is up 12% and body weight is trending down 0.4 lb per week. Sleep dipped Thursday; nothing to fix yet.
Reads the trailing seven days
Coach Q&A
"Can I fit a burger tonight?" Yes. About 740 kcal of headroom left. Keep protein near 40g and the day still lands.
Answers from your real macro headroom
Plans
A plan you can actually see.
Workout and meal plans live in a week-by-week viewer with day-level detail. Build them yourself for free, or let AI draft the whole block on Pro.
Week and day viewer, so today's session is one tap away
Free photo analysis and barcode lookup keep logging fast. GemFit Pro adds text and workout parsing, TDEE, calorie-burn, and deficit guidance from your body metrics. Logging stays simple and every estimate remains reviewable.
Calorie burn
AI calculates your calorie burn.
From your age, weight, height, sex, and activity level, AI builds your TDEE, then adds workout and step burn for every session, with the method shown so the number is not a black box.
Deficit + macros
AI builds your daily deficit.
Pick a goal (lose weight, recomp, gain). AI sets a calorie target with safety guardrails, splits macros around a bodyweight-anchored protein floor, and adjusts the math when your weight or training changes.
Photo logging
Snap a plate, log the meal.
Point the camera at any meal. Vision AI identifies foods, estimates portions with reasoning, and returns calories, protein, carbs, and fat in seconds. No database hunting.
Pro text · Free barcode
Type with Pro. Scan on Free.
Pro can parse a sentence like "grilled chicken, rice, broccoli" into an editable meal card. Barcode lookup remains available on Free and checks published food data.
Confidence tiers
Confidence on every single meal.
Each entry is tagged official, web-verified, or AI estimate. You see where the macros came from, so the deficit math is built on numbers you can trust.
AI coach
AI reads your trailing seven days.
Ask the coach how you are doing. It reads meals, workouts, body weight, sleep, and the running deficit, then answers in two short sentences. Calm, not preachy.
Honest by design. GemFit shows whether each macro estimate is official, web-verified, or an AI guess, and applies safety guardrails on every deficit. No starvation targets, no silent guesses.
Accuracy by design
More than just LLM in, LLM out.
Most AI nutrition apps run a meal through one model and call it a day. GemFit runs every entry through up to four grounding sources before returning a number, and shows you which tier the result came from.
01exact_official
Official databases first
Barcoded items resolve against Open Food Facts. Whole-food entries query USDA FoodData Central. Both return the highest confidence tier when matched.
02exact_official
Restaurant menu lookups
Recognized chain meals are cross-referenced with the official nutrition pages of major restaurant brands. Verified menu data overrides any AI estimate.
03corroborated_web
Two independent web searches
If no official source is found, two separate grounded web searches run in parallel. Results are accepted only when both sources agree within a 15% tolerance, then averaged.
04llm_estimate
AI estimate, marked clearly
When verification fails, the system returns an AI estimate with a visible confidence tier. You always know whether you are looking at verified data or a model guess.
Guardrails on every step
Asks instead of guessing
Ambiguous meals trigger a one-tap clarification (which sauce, which size) before the AI commits to a number.
Schema and sanity checks
Outputs are validated against a strict schema. Calories without macros, missing nutrients, and out-of-range portions are rejected before they reach your log.
Tier transparency
Every meal carries one of four tiers: official, web-corroborated, AI estimate, or unresolved. The day grade is computed from those scores so it cannot overstate confidence.
Falls back, does not fabricate
If both grounding and corroboration fail, the entry stays unresolved and waits for manual edit instead of inventing a value.
MCP agent connectivity
Your agent can log it for you.
GemFit ships a real MCP server. Connect Claude or any MCP client and your agent can read summaries, check macro headroom, and draft logs or plans. Every write lands as a draft you approve in the app. Nothing saves itself.
gemfit_get_day_summary1,812 kcal · 142g protein · deficit on pace
gemfit_get_macro_headroom740 kcal headroom · 38g protein to floor
gemfit_create_food_log_draftdraft created → waiting in the app
gemfit_build_workout_plan_draft4-week block drafted → needs your approval
2 drafts pending your approval in the app
Pricing made simple
Free does the basics. Pro does the math.
Every other fitness app has manual tracking, a dashboard, and a feed. Pro is what makes weight loss actually work, by letting AI calculate the parts that take time, accuracy, and discipline.
Free
$0 forever
Everything a normal fitness app gives you, no credit card.
Manual workout logging (sets, reps, weight, RPE)
Manual meal logging from a food database
Meal-photo analysis and barcode lookup
Calorie and macro tracker
Confidence shown on analyzed meal entries
Premium dashboard and weekly summary
Workout history, PRs, and templates
Private fitness logging and reports
Body weight and basic body metric tracking
iOS app, web account portal, and GemFit MCP Connect
Real answers to the questions people ask before they sign up. How the AI works, what is free, what is Pro, and how the deficit math actually runs.
Yes. Free includes manual workout and meal logging, meal-photo analysis, barcode lookup, the macro tracker, weekly summaries, body weight tracking, and private fitness logs. Text-based AI parsing and the deeper coaching tools are part of Pro.
Yes. Food logs, workouts, body metrics, goals, and private progress logs stay private unless you choose to share something. Location is not needed for ordinary logging, AI, billing, or reports; it is only requested if you enable adult social features that require state eligibility. Health, camera, and photo permissions are requested only when you use those features.
Pro adds text-based AI meal and workout parsing, AI calorie-burn and deficit guidance, weekly recaps, coach Q&A, micronutrient enrichment, body-composition insights, and AI-generated plans. Photo analysis and barcode lookup remain available on Free.
From your age, weight, height, sex, and activity level, AI builds your TDEE. Workout and step burn add to it daily. Your goal (lose weight, recomp, gain) sets a target with safety guardrails. The deficit is your net for the day, calculated live as you log.
It depends on the entry. Barcode and recipe entries pull verified data from USDA and Open Food Facts and score highest on the confidence scale. Photo estimates score lower and are editable in one tap. The score is shown on every meal so you always know what you are looking at.
GemFit does not promise a specific outcome. It does make the behaviors that produce sustained weight loss (low-friction logging, accurate macros, honest deficit math, weekly review) much easier to keep doing. That is what a calorie deficit actually requires.
Yes. In-app purchases are managed through the App Store, while existing web-purchased access remains attached to the same GemFit account. If Pro ends, your Free features and existing data remain available.
Make the next rep, meal, and report count.
Open a clean dashboard, log the day, and let GemFit turn training and nutrition data into momentum you can use.
