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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.

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

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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.
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Everything else, you just text it

Thirteen things the app does, all from the same thread. No menus.

  • Foodchipotle chicken bowl, double rice, no cheese785 cal · 52g P · 96g C · 21g F
  • Photos[sends a photo of dinner]Salmon, rice, broccoli. Around 610.
  • Bodyweightweighed in at 178.4Trend's 179.1, down 0.6.
  • Goalsswitch me to maintenance2,450 from today.
  • Measurementswaist 32.5 this morningDown an inch since March with weight flat.
  • Workoutslegs, 5x5 squats at 225That's 20 lbs up since January.
  • Injuriesleft knee is acting up againPulling the running days. Same knee as February?
  • Wateranother 32oz96oz. You're ahead of yesterday.
  • Journalslept badly, work stressYou run about 300 over on bad-sleep days.
  • Recipessave this as my usual overnight oatsSaved. Just text "usual oats" next time.
  • Custom foodsmy protein shake is 240 cal, 40g protein40g in 240. Saved.
  • Editsdelete the bobaGone. Back to 1,350.
  • Remindersremind me to weigh in at 8amEvery morning at 8. I'll be insufferable about it.

Came here from a calculator or an article?Build a restaurant meal →See how adaptive TDEE works →What Zolt does →

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.

2,640

cal / day

Week 16 · +190 vs the calculator

2,450What the calculator said in January, and would still be saying
Started runningTwo weeks awaySick weekWeek 1Week 16
Measured burnCalculator estimate, 2,450Markers are your own journal entries

A calculator gives you one number in January.Zolt gives you a new one every Sunday.

It notices. You say why.

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

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

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

ASK, was sick tue through thu

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

It can be six different people

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

Dry, direct, knows the science cold

and a levain chocolate chip walnut

620. That's a quarter of your day, delivered by cookie. → day 1,520/2,180 cal

Same 620 calories. Same 660 left. Same 37g of protein still on the board.

Everything you text is already in the app

Same log, same number, whichever one you open. The app is where the rest of the picture lives: sleep, recovery, trends, and the reasoning behind today’s target.

‹

Zolt Coach ›

Today 9:41 AM

usual oats
420. Logged. → day 420/2,180 cal
chipotle chicken bowl, double rice, no cheese
785 cal · 52g P · 96g C · 21g F → day 1,205/2,180 cal
and a levain chocolate chip walnut
620. That's a quarter of your day, delivered by cookie. → day 1,825/2,180 cal
scoop of whey
120, and 24g of protein. 235 left on the day.
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iMessage
6:40●●● ᯤ ▰
Today, Aug 3012-day streak
M24
T25
W26
T27
F28
S29
S30

Remaining today

235cal

1,945 eaten2,180 target

Protein

105 / 165g

Carbs

219 / 215g

Fat

69 / 70g

＋ Log food

Today’s meals

☀Breakfast420 cal›
◒Lunch785 cal›
☾DinnerNot logged›
◆Snacks740 cal›

Target updated this morning

Held at 2,180 after your sick week. Reassessing Sunday.

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And the two scores that decide tomorrow

Both are read from Apple Health or Health Connect overnight. Sleep sets recovery, recovery sets whether the coach tells you to push or hold, and neither needs you to log anything.

  • Trend weight
  • Energy & TDEE
  • Widgets
  • Apple Watch
  • Apple Health
  • Health Connect
  • Barcode scanning
  • Photo logging
  • Daily Zolt Score
Get the app
  • 6:40●●● ᯤ ▰
    ‹ⓘ

    Time asleep

    6h 52m

    91%

    Efficiency

    11:48p

    Bedtime

    7:20a

    Wake

    Stages

    AwakeREMCoreDeep11:48p7:20a

    Breakdown

    Deep1h 06m16%
    REM1h 28m21%
    Core4h 18m63%
    Awake40m

    Apple Watch · Updated 7:22 am · How sleep stages are detected ›

    Sleep

    Stages, HRV, and resting heart rate, scored against your own baseline

  • 6:40●●● ᯤ ▰
    ‹ⓘ

    Recovery

    62Fair

    48 ms

    HRV

    58 bpm

    Resting HR

    6h 52m

    Sleep

    What moved it

    Sleep duration−7←
    Resting HR−5←
    HRV−4←
    Prior-day load−2←

    Apple Watch · Updated 7:22 am · How recovery is scored ›

    Recovery

    Whether today is a push day or a back-off day, before you get to 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.
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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
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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.

57 menus, and hundreds more items 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