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Luno vs Cronometer:
speed or micronutrient depth?
Cronometer is built for people who want to chart their vitamin D and magnesium. Luno is built for people who want to log lunch in three seconds. Here's how to know which one is you.
Pick Luno if
- You want to log a meal with a photo or a sentence, not a search bar.
- You're on iPhone and want tight Watch / Siri / HealthKit integration.
- You want a tracker, not a research tool.
- You'd rather pay $2.99/mo than $9.99/mo.
- You want an AI coach you can talk to (Ask Luno, MCP).
Pick Cronometer if
- You actually care about vitamin K2, B12, magnesium, and trace minerals.
- You're a biohacker, dietitian, or following a clinical protocol.
- You need NCCDB-grade food data, not crowdsourced entries.
- You log on Android or a desktop web app.
- Precision matters more to you than logging speed.
The differences that drive the choice
Detail-by-detail comparison further down. This is what matters in the first 30 seconds.
Three seconds vs ninety
Cronometer's interface is dense by design — every search shows nutrient panels, portion units, and source attribution because that's what its users want to see. The trade-off is that logging a single meal is a multi-step task: pick the food, pick the right NCCDB or USDA entry, pick the unit, pick the quantity, confirm.
Luno collapses that into one action: take a photo or hold the dictation button. AI parses items and nutrition; you confirm or correct. Same outcome, a tenth of the friction.
If you're tracking weekly trends, Luno wins. If you're tracking your magnesium on a 6-week protocol, Cronometer wins — but you knew that already.
84 nutrients, not 4
Most calorie trackers track calories, protein, carbs, fat — maybe sugar and sodium. Cronometer tracks 84+ including all eight B vitamins, vitamin D, K, every essential mineral, omegas, amino acids. The data quality is research-grade because Cronometer was built by people who came from food science.
Luno tracks 13 fields — the macros plus fiber, sugar, sodium, cholesterol, potassium, calcium, iron, vitamin A, vitamin C. Enough for daily fitness and weight goals; not enough for clinical micronutrient management.
If you can name three minerals you actively try to hit, Cronometer is probably the right app. If you can't, you don't need 84 nutrients — you need a tracker that doesn't get in your way.
Both are reasonable. Luno is cheaper.
This is one of the few comparisons where the competitor isn't gouging. Cronometer Gold is $9.99/mo or $49.99/yr — far less than MyFitnessPal Premium and arguably fair for the depth they ship.
Luno Pro is $2.99/mo or $39.99/yr. The difference at monthly billing is significant; at annual billing it narrows to $10/yr. If price is the deciding factor, Luno wins. If it isn't, the rest of this page matters more.
Both apps are usable on a free tier, and neither shows ads. That's the right baseline; the market just got used to MyFitnessPal making it the exception.
AI assistant integration
Luno ships an MCP server so Claude, ChatGPT, Gemini, and Codex can read your nutrition and log meals through chat. Tell Claude what you ate; the meal lands in Luno. Ask which day this week you hit your protein goal; it pulls the data and answers.
Cronometer has no equivalent. They have a developer API for custom integrations, but it's not an AI assistant connector — there's no "log a meal from Claude" path.
If you live in AI tooling, this is a real gap. See /mcp for the full Luno tool list and connection guides.
Where Cronometer beats Luno
We'd rather call this out up front than have you discover it after switching.
Micronutrient tracking is unmatched
If you've ever wanted to know how much vitamin K, magnesium, or zinc you're actually getting — Cronometer is the only mainstream tracker that does this seriously. The data is research-grade.
Food database is built for accuracy
NCCDB + USDA-sourced entries with proper attribution. No crowdsourced "chicken breast (cooked, maybe?)" duplicates. If you're following a clinical or research protocol, this matters.
Cross-platform — Android and web
Luno is iPhone-only. Cronometer runs on Android, iOS, and as a full web app. If you log from multiple devices, this wins by default.
Built-in exercise log with custom activities
Cronometer has a real exercise database including custom activities and target heart-rate zones. Luno reads exercise from HealthKit but doesn't have a built-in exercise entry screen.
Loved by dietitians and biohackers
If you're using a registered dietitian or doing a structured supplementation protocol, Cronometer is the app they'll already know how to read. The community and ecosystem around it is the right one for clinical work.
Detailed feature comparison
The full matrix, grouped by category. Every checkbox you'd want before switching.
Common questions
Is Cronometer more accurate than Luno?
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For individual food entries, yes — Cronometer's NCCDB and USDA-sourced data is the gold standard for raw nutrient accuracy. Where Luno catches up is portion estimation: Cronometer requires you to enter exact grams, while Luno's AI infers portion from a photo. So Cronometer is more precise on the catalog side, Luno is more accurate on the real-world-portion side. Both publish their methodology — see /accuracy for Luno's.
Can Cronometer track vitamin D and minerals better than Luno?
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Yes, by a meaningful margin. Cronometer is purpose-built to track 84+ nutrients including the full vitamin and mineral panel. Luno tracks 13 fields — enough for fitness and weight goals, not enough for clinical micronutrient management. If you're doing a structured supplementation protocol or working with a dietitian, Cronometer is the right tool.
Why doesn't Luno track more micronutrients?
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Tracking 84 nutrients is only useful if you log every meal with high portion accuracy — and most people don't. We optimised for the case where logging needs to be fast enough to actually happen, then we picked the 13 nutrient fields most users actually look at. Adding more is on the roadmap once we can do it without adding logging friction.
Can I export from Cronometer and import into Luno?
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Yes, in one tap. Export your data from cronometer.com (Account → Account Profile → Export Data), then in Luno open Settings → Import from Another App, pick Cronometer, and upload the CSV. Luno parses the export and backfills your meal and weight history into your account. Micronutrient detail you tracked in Cronometer is preserved where Luno has matching fields; anything outside Luno's 13-nutrient schema is dropped (see /accuracy for the schema).
Does Cronometer have AI photo scanning?
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Not natively. Cronometer's logging flow is search-based: find the food, pick the entry, set the portion. Luno's AI photo and voice logging are the headline difference between the two apps — they're each optimising for a different user.
Which app do dietitians use?
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Most clinical dietitians who recommend a tracker recommend Cronometer, specifically for the micronutrient panel and database quality. Luno is built for the consumer fitness use case, not the clinical one. If your dietitian asked you to track something specific, listen to them.
Ready to try it?
Log a few meals on Luno and see how it feels. Free for the first three meals a day — no card required.