Comparison

Trio vs Marrow

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Trio

Features
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Many nutrition apps track pretty much everything. They overwhelm you with information and features. They complicate. Trio tracks three things: protein, calcium, and fiber. No calorie counting, no weight tracking, no guilt. WHY THESE THREE? Calcium is the primary building block of bone โ€” 98% of your body's calcium is stored in your bones. Protein makes up roughly 30% of bone tissue and is essential for maintaining muscle mass as you age โ€” stronger muscles mean better balance and fewer falls. Fiber supports the gut microbiome, which plays an important role in overall nutrient absorption and metabolic health. Together, they form a nutritional foundation for staying strong as you age. CALCIUM FROM FOOD FIRST, NOT JUST PILLS Told to get 1,000โ€“1,200mg of calcium a day? The guidance is clear: food first, supplements only for what's left. But how much calcium does your food actually deliver? Trio shows you โ€” and helps you spread it across meals so your body absorbs it. LOG A MEAL IN UNDER 30 SECONDS Type a food, scan a nutrition label, or photograph your meal. Trio fills in the numbers. SEE WHERE YOU STAND AT A GLANCE Three animated rings show your daily progress. Tap any ring for food suggestions to close the gap. Set your dietary preferences โ€” vegetarian, dairy-free, gluten-free, and more. Suggestions adapt to what you actually eat. ASK ANYTHING Does coffee affect how I absorb calcium? Is plant protein as good as animal protein for muscle? The built-in nutrition assistant explains things clearly โ€” no jargon, no lecture. YOUR DATA STAYS ON YOUR DEVICE No account required. Everything you log lives on your phone, private by default. BONE HEALTH MODE An optional mode that goes deeper on bone health: recommended targets based on your age, sex, height, weight, and activity level, a gentle note when one meal contains more calcium than your body can efficiently absorb at once or when a day goes over the recommended maximum, food suggestions that favor bone-supportive choices, and a nutrition assistant that keeps your bones in mind. Trio is for anyone who wants to eat intentionally for long-term health. It's less about hitting three perfect numbers than about learning what's actually in your food โ€” so eventually you don't just know whether you hit your target, you understand why. Use it on its own, or alongside whatever health app you already use. Built to educate and encourage, not restrict. It's about what you eat โ€” not what you don't.

About

Marrow

Features
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Most people fall short of the 1,000 mg daily calcium goal without realizing it. Marrow makes it effortless to close that gap โ€” log what you eat, track sun exposure for vitamin D, and see your progress at a glance. โ€” KEY FEATURES โ€” โ€ข Daily calcium progress bar โ€” live mg counter tracks your intake toward the 1,000 mg goal, turning green the moment you hit it โ€ข Sun exposure log โ€” tap +/- to record minutes of sun each day to support natural vitamin D synthesis โ€ข 30 curated calcium-rich foods โ€” dairy, leafy greens, fish, nuts, seeds, and plant-based options, each with exact mg per serving โ€ข Category filters and search โ€” quickly find any food by category (Dairy, Leafy Greens, Fish, Nuts, Plant-Based) or by name โ€ข Foods sorted by calcium content โ€” highest-impact choices always surface first โ€ข Log and remove meals โ€” add a food in two taps; remove it just as easily if you log by mistake โ€ข 14-day history chart โ€” color-coded bar chart shows daily totals at a glance, with a goal reference line โ€ข Summary stats โ€” see your average daily calcium and how many of the last 14 days you hit the goal โ€ข Per-day breakdown โ€” tap into any past day to see every food logged and sun minutes recorded โ€ข Fully offline and private โ€” no account, no data leaves your device Whether you are preventing osteoporosis, recovering bone density, or simply building better eating habits, Marrow gives you an accurate, distraction-free way to take control of your bone health. This app is for informational and tracking purposes only and is not a substitute for medical advice. Consult a qualified healthcare professional before changing your diet or health plan. โ€” Marrow Bone Health PREMIUM โ€” Premium unlocks unlimited food and sun logging, the full 14-day history chart with goal trends, a personalized daily calcium target, and an ad-free experience โ€” everything stored 100% offline on your device. Subscription options: โ€ข Weekly โ€” $9.99 / week โ€ข Yearly โ€” $49.99 / year (includes a 3-day free trial) Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the period. Manage or cancel anytime in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://pnkl26.web.app/privacy-policy

Screenshots

Trio4 screens
Marrow3 screens

Verdict

The call

The clearest difference is in-app purchases: Trio at none against Marrow's 2. Trio also leads on iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Marrow sells 2 in-app purchases, starting at $9.99 per 7 days. Trio asks for nothing beyond the download.

Scorecard2 real differences ยท 4 level
Trio versus Marrow: the parameters behind the verdict, then further details
ParameterTrioMarrow
PriceFreeFree
Update frequencyโ€”Every 8 days
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPod โ€” betteriPhone
Requires iOS15.1 โ€” better17.0
Further details โ€” not scored
Size38 MB1 MB
Age rating4+4+
DeveloperUri KreindlerLinh Phan Nhat Khanh

In-app purchases

None

Trio

No in-app purchases

2 purchases

Marrow

Subscriptions2
  • Marrow Bone Health Weekly$9.997 Days
  • Marrow Bone Health Yearly3 Days trial$49.991 Year

Questions

Is Trio free?
Trio is free to download, with no in-app purchases.
Is Marrow free?
Marrow is free to download, with in-app purchases available.
Do Trio or Marrow have ads?
Neither Trio nor Marrow shows ads.

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