Available on iMessage

The calorie target that keeps up with you

Zolt learns your real metabolism from your food logs and weigh-ins, then adjusts as your training, travel, and life change. Text it to log.

Start texting ZoltGet the app

Free to start. Works in Messages. The app is optional.

‹

Zolt Coach ›

Today 9:41 AM

panda express orange chicken with fried rice
Logged. 900 cal · 29g P · 103g C · 42g F. → day 900/2,180 cal
and a levain chocolate chip walnut
620. That's a quarter of your day, delivered by cookie. → day 1,520/2,180 cal
660 left and 37g of protein on the board. Dinner is carrying this one.
+
iMessage

Start with what you need

Use a free tool, understand the engine, or see how the pieces fit together.

It moves when your life does

A calculator gives you one number in January and never revisits it. Zolt solves for your burn rate every day from what you ate and what the scale did. The industry calls this adaptive TDEE. Most apps only claim it.

Started runningTwo weeks awaySick weekWeek 1Week 16
Measured burnCalculator estimate, 2,450Markers are your own journal entries

It notices. You say why.

Zolt won’t pretend to know that you were ill or travelling. It shows you the change and asks.

Weekly

A proposed target every Sunday. You approve it, keep last week’s, or talk it through.

Daily

Or let it recalculate every morning and just send you the recap. No reply needed.

Sunday check-in

Cut · week 7

Trend weight
179.1 lb−0.6 this week
Pace
0.6 lb / wkOn plan
Adherence
6 of 7 daysLogged

New target

2,150cal

+50

165g

Protein

215g

Carbs

70g

Fat

YES

Apply it

KEEP

Roll over

ASK

Talk it through

ASK — was sick tue through thu

That explains the dip. Holding you at 2,100 this week rather than cutting further.

Where the whole picture lives

Texting is the fastest way in. The app is where it all adds up: scores, trends, sleep, recovery, and the reasoning behind today’s number.

  • Daily Zolt Score
  • Widgets
  • Apple Watch
  • Apple Health
  • Health Connect
  • Barcode scanning
  • Photo logging
Get the app
TodayMon 31 Aug
14
72
Zolt
68
Sleep
81
Activity
66
Recovery
Edit
Recovery 66, below your 14-day average of 74
Eaten1,160
1,840calories left
Target3,000
Protein96/180
Carbs132/300
Fat48/95
Today
Customize
Steps
14-day avg 7,900
8,412
Active burn
14-day avg 470 kcal
512
Exercise
Push day · avg HR 118
46m
Hydration
Goal 3.0 L
1.8 L
Sleep
Score 68 · 52 min below need
6h 42m
Add food
Home
Coach
Goals
Log
You

  • Energy & TDEE

    2,640

    Maintenance calories

    Personalized estimate

    Personalized from your weight changes and food logs.

    Adaptive TDEE
    Estimated Breakdown

    Your estimated maintenance energy breakdown on an average day.

    Metabolism

    1,690 cals

    Zolt Adjustment

    120 cals

    Exercise

    350 cals

    Movement

    480 cals

    Energy & TDEE

    The burn rate, broken into where it came from

  • Bodyweight

    TREND WEIGHT
    -0.6 lb/wk
    179.1lb

    7-day average

    Scale Weight:178.4• Today
    TueSep 1
    Scale
    178.4lb
    Trend
    179.1lb
    MonAug 31
    Scale
    180.2lb
    Trend
    179.3lb
    SunAug 30
    Scale
    179.0lb
    Trend
    179.5lb
    SatAug 29
    Scale
    181.1lb
    Trend
    179.6lb
    FriAug 28
    Scale
    178.6lb
    Trend
    179.7lb

    Trend weight

    Signal pulled out of daily scale noise

  • Today

    Breakfast
    420 cals
    P20g
    C55g
    F14g
    Fi8g

    Overnight Oats

    20P  14F  55C • 1 serving

    420 cals
    Lunch
    785 cals
    P52g
    C96g
    F21g
    Fi12g

    Chipotle Chicken Burrito Bowl

    52P  21F  96C • 1 bowl

    785 cals
    Snacks
    740 cals
    P33g
    C68g
    F34g
    Fi3g

    Levain Chocolate Chip Walnut Cookie

    9P  33F  65C • 1 cookie

    620 cals

    Whey Protein Isolate

    24P  1F  3C • 1 scoop

    120 cals

    Food log

    Everything you texted, plus everything you scanned

  • Stages, HRV, and resting heart rate, scored

    Sleep

    Stages, HRV, and resting heart rate, scored

  • Whether today is a push day or a back-off day

    Recovery

    Whether today is a push day or a back-off day

Everything else you can just text it

Thirteen things the app does, all reachable from the same thread.

  • Food

    chipotle chicken bowl, double rice, no cheese

    785 cal · 52g P · 96g C · 21g F

  • Photos

    [sends a photo of dinner]

    Salmon, rice, broccoli. Around 610. Portion is bigger than last time so I rounded up.

  • Bodyweight

    weighed in at 178.4

    Trend's 179.1, down 0.6. Your fat is leaving on schedule.

  • Weight goals

    switch me to maintenance

    2,450 from today. You were 3 lbs out, so this is a choice and not a stall.

  • Measurements

    waist 32.5 this morning

    Down an inch since March with weight flat. That's recomp, and it's the slow kind that sticks.

  • Workouts

    legs, 5x5 squats at 225

    225 for 5x5. That's 20 lbs up since January.

  • Injuries

    left knee is acting up again

    Second flare this month. I'm pulling the running days. Same knee as February?

  • Water

    another 32oz

    96oz. You're ahead of yesterday and it's only 2pm.

  • Journal

    slept badly, work stress

    You run about 300 over on your bad-sleep days. Worth knowing before dinner.

  • Recipes

    save this as my usual overnight oats

    Saved. Just text "usual oats" next time.

  • Custom foods

    my protein shake is 240 cal, 40g protein

    40g in 240 calories. Saved, and that shake is doing real work.

  • Edits

    delete the boba

    Gone. Back to 1,350, as if it never happened.

  • Reminders

    remind me to weigh in at 8am

    Every morning at 8. I'll be insufferable about it.

And it can be six different people

Text PERSONALITY to switch. The numbers never change. The delivery entirely does.

  • Pro

    Dry, direct, knows the science cold

  • Hype

    Every logged meal is a sports broadcast

  • Bestie

    Lowercase, texty, lowkey devastated

  • Roast

    Compliments are rare and clearly painful

  • Villain

    Your cut is a world domination plan

  • Philosopher

    Marcus Aurelius texting from the gym

Put your coach in the group chat

The fastest accountability system ever built is four friends who can see each other’s numbers. Zolt runs the scoreboard.

Add it to a thread you already have
Zolt introduces itself once, then stays quiet until someone talks to it. It is a group member, not a bot that posts all day.
Nobody appears without opting in
Members reply JOIN before their numbers show up in a leaderboard. Everyone keeps their own account, targets, and history.
Everyone logs in the same place
Each person’s food goes to their own log. The group only ever sees what the group asked for.
‹

Cutting Season ›

Today 6:12 PM

Dev

STATUS
Priyam 1,840 / 2,180 · 142g P Dev 2,010 / 2,400 · 158g P Asha 1,290 / 1,900 · 88g P
Asha you have 610 calories and four hours. Live a little.

Asha

ordering right now
+
iMessage

It already knows the menu

Panda Express, In-N-Out, Chipotle, Chick-fil-A. Real menus with the restaurant’s own build rules, so a bowl you customised counts correctly instead of landing as a rough guess.

Including the ones nobody else bothered with

Tea houses are modelled down to the sweetness level and the topping. Try texting it a HEYTEA order and watch it come back with a real number.

Hundreds more go in every week. The same menus power the calculators on this site, the search in the app, and the coach in your messages, so a number never changes depending on where you looked it up.

Browse every calculator →

Send it what you ate

No account to create first, no onboarding flow to finish. Text the number and it starts working out your metabolism from there.

Start texting ZoltGet the app