Comparison

Key Nutrients RDA Calculator vs Calcium

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

Head to head
About

Key Nutrients RDA Calculator

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An invaluable tool when planning a healthy diet or nutritional strategy. The innovative state-of-the-art design makes it super easy to calculate recommended daily intakes for 12 key nutrients — calories, carb, saturated fat, protein, fiber, sodium, potassium, calcium, iron, magnesium, zinc, and vitamin K — based on USDA & DHHS Dietary Guidelines for Americans, 2020-2025 personalized for age, male vs female, physical activity level, & whether pregnant or lactating.

About

Calcium

Effortlessly track your daily calcium intake with this simple and elegant app. It integrates seamlessly with Apple Health, offers automatic iCloud backups, and provides smart reminders. No login or ads are required, making it a completely free and private health companion.

Highlights
  • Seamless calcium intake tracking
  • Full Apple Health integration
  • Automatic iCloud backups
  • Smart reminders
  • Custom daily intake schedule
  • No ads or login required
Features
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Simple and elegant calcium tracker for your watch. Apple Health integration. iCloud backups. Schedule & reminders. No login. No ads. Free. ■ FEATURES • Seamless calcium intake tracking • Full Apple Health integration • Automatic, secure iCloud backups • Trusted data from the U.S. National Institutes of Health • Science-based personalization by age and gender • Sync across all your Apple devices • Effortless history review • Smart reminders to stay on track • Custom daily intake schedule • No ads, no login, no in-app purchases • 100% free ■ SAFE AND SECURE Privacy is not something you are merely entitled to, it is an absolute prerequisite. At Martspec, we believe privacy is a fundamental human right. So we built it into our products from the beginning of the design process. We do not share your data with any 3rd party. We do not use it for advertisement purposes and do not use it for profit. Your data is stored only on your Apple service (Apple Health store and iCloud). We do NOT store your data on our servers. ■ DISCLAIMER The nutritional information provided in this app is sourced from the U.S. National Institute of Health and the book “Nutrition for Health and Health Care,” 3rd Edition, by E. Whitney. This content is designed strictly for educational purposes and should NOT replace professional medical advice, diagnosis, or treatment. Your use of this application is entirely at your own discretion and risk. The app is made available to you “as is” and “as available,” without any representations or warranties of any kind. While we strive for excellence in our software development, Martspec cannot guarantee that the app will be free from errors or defects. Martspec expressly disclaims all warranties, whether express or implied, including, but not limited to, implied warranties of merchantability, fitness for a particular purpose, and non-infringement. We do not warrant that the app, or any content provided through it, will always be available, uninterrupted, timely, secure, current, accurate, complete, or error-free. You acknowledge that your exclusive remedy for any dissatisfaction or issues with the app is to discontinue its use. Martspec shall not be liable for any direct, indirect, incidental, special, consequential, or exemplary damages, including but not limited to, damages for loss of profits, goodwill, use, data, or other intangible losses resulting from the use or inability to use the app. ■ BUILD TOGETHER At the heart of everything we do is one simple goal: to help you feel and live better every day. Our mission is to expand human potential by merging cutting-edge technology, beautifully crafted design, and the insights you share directly with us. We ground our work in science—leveraging trusted research and real-world data—while it’s your feedback that guides our journey forward. This isn’t just an app; it’s a shared experience. We’re a passionate team of creators, and you’re the co-pilot. Every idea, suggestion, and request helps us build smarter features, refine your experience, and eliminate what doesn’t serve you. Together, we’re crafting a tool that evolves with you to make daily life smoother and more vibrant.

Screenshots

Key Nutrients RDA Calculator4 screens

Verdict

The call

The clearest difference is iOS requirement: Calcium at 13.0 against Key Nutrients RDA Calculator's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Key Nutrients RDA Calculator ships an update every 6 months, Calcium every 3 months. The most recent releases landed on September 10, 2026 and September 21, 2026 respectively.

Scorecard1 real difference · 9 level
Key Nutrients RDA Calculator versus Calcium: the parameters behind the verdict, then further details
ParameterKey Nutrients RDA CalculatorCalcium
PriceFreeFree
Rating3.7 (3 ratings) — better
Positive reviews100.0% of reviews
Number of ratings3 — better
Update frequencyEvery 6 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree
DevicesiPhone, iPadiPhone, iPod, Apple Watch — better
Requires iOS17.013.0 — better
Further details — not scored
Size6 MB7 MB
Age rating12+12+
DeveloperFirst Line Medical Communications LtdMartspec LLC

In-app purchases

None

Key Nutrients RDA Calculator

No in-app purchases

None

Calcium

No in-app purchases

Questions

Is Key Nutrients RDA Calculator free?
Key Nutrients RDA Calculator is free to download, with no in-app purchases.
Is Calcium free?
Calcium is free to download, with no in-app purchases.
Do Key Nutrients RDA Calculator or Calcium have ads?
Neither Key Nutrients RDA Calculator nor Calcium shows ads.
Which is updated more often, Key Nutrients RDA Calculator or Calcium?
Key Nutrients RDA Calculator ships an update every 6 months, and Calcium every 3 months. Most recently, Key Nutrients RDA Calculator was updated on September 10, 2026 and Calcium on September 21, 2026.

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