The Cronometer alternative for GLP-1 users

You've been logging in Cronometer for weeks. You know your magnesium to the milligram. But when your prescriber asks how the last dose step went, you're scrolling through a custom biometric you set up yourself and trying to remember which days you felt sick.

A quick note: this page is written by the team behind Holt. Cronometer details come from its App Store page and website, checked on November 1, 2026.

Why does a nutrient tracker leave gaps on a GLP-1?

Cronometer is very good at what it was built for: precise nutrition. Its listing describes 95+ vitamins and minerals and more than 1.1 million verified foods. Its diary compares what you eat with personalized targets — a precise tool, designed around food, whether your goal is eating less or eating better.

On a GLP-1, the daily question changes. Appetite can fall away after a dose, and the real work becomes getting enough protein, fiber and fluid in — and understanding why some days feel worse than others. That second half lives outside a food diary.

Cronometer's App Store listing doesn't mention GLP-1. Its blog suggests a workaround: create a custom biometric (a Gold feature) to log your dose, and log biometrics like energy or stool to watch symptoms. It works, but you're building a GLP-1 tracker out of parts.

Why do GLP-1 users switch to Holt?

Because in Holt, the dose is the starting point, not an add-on.

• Shot day, built in. Reminders and a Live Activity on your lock screen, an estimated medication-level chart over 7 or 30 days, and a countdown to your next dose.
• Injection sites. Log arms, stomach or thighs, left or right, and Otto suggests the next spot in your rotation. Dose history keeps strength, site and adherence together.
• Side effects that mean something. Severity sliders for nausea, constipation, heartburn, food noise, suppressed appetite and fatigue, plus your own — lined up against your dose days.
• Food in one photo. Holt estimates calories, protein, fiber, carbs and fat from a picture of your plate.
• A report for your appointment. A doctor-visit PDF covering 30 days, 90 days or your full history, with suggested questions.

What changes when you switch?

You stop maintaining a system and start reading one. There's no custom field to remember, and the connection between a dose and the queasy afternoon two days later appears on the timeline by itself.

Meal logging changes too. Cronometer lists photo and voice logging under Gold. In Holt, a photo is the main way to log food, focused on the five numbers that matter most on a quiet appetite. Holt is free to download, with some features in an optional subscription.

What you'd give up: Cronometer's micronutrient depth, its free barcode scanning, its wearable connections beyond Apple Health, and its Android and web apps. Holt is iPhone only for now.

Should you stay with Cronometer?

Stay with Cronometer if:

• Micronutrients are the point — you or your dietitian watch iron, B12 or other specific nutrients closely.
• You use Android or the web, or rely on Garmin, Oura or Whoop data.
• You're happy with a custom biometric for doses and don't need levels, sites or a report.

Plenty of people keep both — Cronometer for an occasional deep check, Holt for the everyday rhythm of the medication.

What we'd track in your first two weeks with Holt

1. Every dose and its site, so the level chart and next-site suggestion come to life.
2. A photo of most meals, watching protein and fiber first.
3. Side effects with a severity on shot day and the two days after.
4. Water daily, because fluids slip when appetite does.
5. A doctor-visit report before your next appointment — and, if you see a dietitian, bring it to them too.

Download Holt and track your next dose cycle

Whichever app you use, it records what you were prescribed and how you felt. Questions about your dose belong with your prescriber; nutrient targets are worth checking with a dietitian.