KalcuLytes vs FP Notebook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KalcuLytes
This medical app calculates and recommends doses for Magnesium, Phosphorus, and Potassium replacement in adult patients. It offers intravenous and oral/enteral administration routes, individualizing doses based on patient factors.
- Calculate Magnesium, Phosphorus, Potassium doses
- Recommend mode of administration
- Intravenous and oral/enteral routes
- Individualized dosing based on patient data
- View target electrolyte ranges
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KalcuLytes is an application that is based on copyright formulae developed to calculate the dose and recommend the mode of administration of Magnesium, Phosphorus and Potassium replacement in adult patients with Hypomagnesemia, Hypophosphatemia and Hypokalemia. This app is designed to provide you with electrolyte replacement dosing by intravenous and oral/enteral routes. The dose is individualized based on patient's age, gender, weight, electrolyte levels and renal function. ** FEATURES ** • Calculate the dose and mode of administration for Magnesium, Phosphorus, and Potassium. • In-App purchases for Magnesium, Phosphorus, and Potassium calculations. • Provides electrolyte dosing by intravenous and oral/enteral routes. • See target ranges for electrolyte inputs.
FP Notebook
A comprehensive medical reference for primary care and emergency clinicians, offering rapid access to over 6100 interlinked topic pages. Content is updated monthly through literature reviews and conferences, providing up-to-date information for medical professionals.
- Rapid access medical reference
- Over 6100 interlinked topic pages
- Content updated monthly
- 31 specialty books
- 700+ chapters
- Point-of-care tool
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Family Practice Notebook is a rapid access, point-of-care medical reference for primary care and emergency clinicians. Started in 1995, this collection now contains over 6100 interlinked topic pages divided into a tree of 31 specialty books and over 700 chapters. FP Notebook’s content is updated monthly with systematic literature reviews and conferences. Please purchase an auto-renewing subscription to receive the latest content. The text content for this mobile application is identical to its online counterparts: fpnotebook.com and fpnotebook.com/mobile. Although access to this application is not restricted, the information found here is intended for use by medical providers. Non-clinical users may find the material challenging to understand, and should address specific medical concerns with their medical providers. Try before you buy with a 14-day FREE trial. After that it's only $24.99/year for access, including continuous content updates. Privacy Policy/Terms & Conditions - http://www.fpnotebook.com/disclaimer.htm
Screenshots
Verdict
The clearest difference is rating: FP Notebook at 4.9 against KalcuLytes's 3.0. FP Notebook also leads on ratings volume (3.4K vs 2) and chart position (#50 vs unranked). KalcuLytes's advantage is monetization model (free with in-app purchases vs subscription) and iOS requirement (9.3 vs 15.0). On price, review sentiment, update cadence and ads 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
Both are free to download. KalcuLytes sells 4 one-off in-app purchases and FP Notebook sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
FP Notebook holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: FP Notebook has 3.4K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 67% of KalcuLytes's written reviews are positive against 61% of FP Notebook's, so the app with the better star average is not the one people write more warmly about.
KalcuLytes ships an update every 3 months, FP Notebook every 2 months. The most recent releases landed on October 6, 2026 and October 26, 2026 respectively.
| Parameter | KalcuLytes | FP Notebook |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 4.9 (3.4K ratings) — better |
| Positive reviews | 66.7% of reviews — better | 61.1% of reviews |
| Number of ratings | 2 | 3.4K — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Best chart rank | — | #50 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.3 — better | 15.0 |
| Further details — not scored | ||
| Size | 5 MB | 141 MB |
| Age rating | 17+ | 17+ |
| Developer | KABBA, LLC | Atmosphere Apps, Inc. |
Customer experience
KalcuLytes
FP Notebook
Bugs and requests
KalcuLytes
Not enough reviews yet to summarise bugs or requests.
FP Notebook
Reported bugs
2 issues- App freezing or crashing on certain devices
- Subscription issues or unexpected charges
Requested features
2 requests- Ability to earn continuing education credits through the app
- Improved search functionality
In-app purchases
KalcuLytes
- Unlimited use of Magnesium$2.99
- Unlimited use of Phosphorus$2.99
- Unlimited use of Potassium$2.99
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- Unlimited use of All Elements$6.99
FP Notebook
- Monthly Subscription$1.991 Month
- Annual Subscription$19.991 Year
- Annual Sub14 Days trial$24.991 Year
Questions
Is KalcuLytes free?
Is FP Notebook free?
Which has better reviews, KalcuLytes or FP Notebook?
Do KalcuLytes or FP Notebook have ads?
Which is updated more often, KalcuLytes or FP Notebook?
Other comparisons
