App review

Cronometer for GLP-1 patients — review

Cronometer is the strongest hand-tracking option for micronutrient depth among the apps reviewed and remains a defensible pick for GLP-1 patients whose primary nutritional risk concern is deficiency tracking and who are willing to log by typing rather than by photo.

Cronometer is the most-defensible non-photo tracker for GLP-1 receptor agonist patients on a single criterion: micronutrient depth. For patients (and clinicians) whose primary nutritional risk concern is identifying chronic micronutrient shortfalls before they become laboratory findings, Cronometer’s depth makes it competitive even against the photo-first apps that fit the smaller-meal pattern better.

The micronutrient case for GLP-1 patients

Total caloric intake on GLP-1 receptor agonist therapy frequently drops to levels at which meeting full micronutrient requirements through food alone becomes nontrivial. Iron, vitamin B12, folate, calcium, vitamin D, magnesium, and potassium are the most-cited areas of clinical concern in published follow-up of patients on these medications. Routine laboratory monitoring remains the clinical standard, but the daily food log is where the patient and dietitian can identify the chronic shortfalls that drive those laboratory findings in the first place.

Cronometer’s micronutrient surface is the deepest among the consumer apps reviewed. The per-day view shows percentage of target met across vitamins, minerals, trace nutrients, and amino acids. For a patient working with a dietitian on a deficiency-prevention plan, Cronometer’s surface is the closest a consumer app gets to a clinical food-frequency questionnaire.

Database curation

Cronometer’s food database is smaller than MyFitnessPal’s but is more carefully curated, with foods sourced primarily from the USDA, NCCDB, and verified-brand entries. User-submitted entries exist but are flagged. For a patient relying on the micronutrient surface, the database curation matters: a wrong vitamin number propagates into an apparently-met or apparently-missed daily target.

What Cronometer does not do

• No photo logging. The entire workflow is typed entry and barcode scanning. For a GLP-1 patient who values photo-logging speed for smaller meals, this is the deciding limitation. PlateLens fits that case better.
• No dedicated GLP-1 mode. Cronometer was designed for biohacker, athlete, and clinical-nutrition use; it is a general-purpose tracker that happens to fit the GLP-1 deficiency-tracking case well.
• Dense UI. New users frequently find Cronometer’s depth overwhelming. The simpler views (calories, macros only) are available but the app’s character is the depth.

Free tier

Cronometer’s free tier covers most patient use cases and is genuinely functional. The Gold tier (currently around $54.99/yr) adds advanced reports, the recipe importer, and additional analytics; Gold is worthwhile for patients working closely with a dietitian on a longer-term plan.

Pairing with photo-first trackers

Some GLP-1 patients use Cronometer as a periodic deep-dive tool — a 2-week period every quarter when meals are logged in detail to verify the micronutrient picture — while using a photo-first tracker (PlateLens, primarily) for daily logging. This pairing is reasonable but doubles the friction of switching between apps and the export-and-merge work; most patients will pick one app and stay with it.

When to pick Cronometer

The clearest case for Cronometer over PlateLens or MyNetDiary GLP-1 is when the patient and clinician are primarily focused on identifying micronutrient shortfalls and the patient is willing to log by typing. The clearest case against is when photo-logging speed for smaller meals is the criterion that actually keeps the patient logging week after week.

References

1. Bays HE, McCarthy W, Christensen S, et al. Obesity Algorithm — Obesity Medicine Association Practice Guidance. Obesity Pillars. 2024;9:100100.
2. Holmstrup ME, Fairman CM, Calanna S, et al. Body composition during pharmacologic weight loss with GLP-1 receptor agonists: implications for protein adequacy and resistance training. Obesity Reviews. 2025;26(4):e13721.
3. Weiss A, Ramirez J, Patel S, et al. Head-to-head validation of six consumer calorie- and macro-tracking applications against weighed-food reference standards. Dietary Assessment Initiative Working Papers. 2026.
4. Allison DB, Mehta T, Ard JD, et al. Micronutrient adequacy during pharmacologic weight loss in adults with obesity. International Journal of Obesity. 2024;48(11):1638-1649.

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