GIR Calc vs PREP Self
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GIR Calc
Calculate the Glucose Infusion Rate (GIR) for single or multiple IV drips. This tool is designed for medical professionals, particularly those in pediatrics or neonatal ICUs, to quickly determine essential fluid and sugar infusion rates.
- Calculate GIR for single or multiple IV drips
- Input weight in kg
- Input sugar percentage and volume (ml/hr)
- Handles non-sugar containing fluids
- Simple calculation button
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-Up to eight simultaneous drips -Live results, rounded to two decimal places -Dextrose presets for D5, D10, D12.5, D15, D20, and D25 -Solve for rate: pick a target GIR and concentration and get the mL/hr, with the option to account for drips already running -Light and dark themes, eight accent colors, fourteen font choices, and adjustable text size -No account, no ads, no data collection. Everything stays on your device. Formulas GIR (mg/kg/min) = Σ (% dextrose × mL/hr) ÷ (6 × weight in kg) Total fluids (mL/kg/day) = Σ mL/hr × 24 ÷ weight in kg Glucose Infusion Rate is a calculation aid for licensed healthcare professionals and does not replace clinical judgment, institutional protocols, or verification of orders.
PREP Self
Access trusted pediatric learning content through a new mobile app. Build a personalized question bank by selecting blocks from various content areas to fit your learning style and schedule. Earn CME credits and MOC points with each block.
- Trusted PREP content
- Customizable question bank
- Case-based questions
- Earn CME credits
- Earn MOC points
- Modern user interface
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Trusted PREP® Content, New Mobile App! For nearly 45 years, the PREP Self-Assessment Program has been a trusted source for pediatric learning and professional growth. Now, we're reimagining the experience. Meet PREP Blocks: A new, customizable way to access the same trusted PREP questions you know and value, designed to fit your learning style, pace, and schedule. • Enjoy a modern, user-friendly interface with a long-awaited mobile app and new desktop experience • Build a Question Bank by selecting blocks from content areas that match your goals • 20 case-based questions per block • Earn up to 4 AMA PRA Category 1 Credits™ and 4 MOC Part 2 Points with each block
Screenshots
Verdict
The clearest difference is rating: GIR Calc at 4.8 against PREP Self's 3.7. GIR Calc also leads on review sentiment (100% vs 67%). PREP Self's advantage is update cadence (daily vs every 4 months) and iOS requirement (15.6 vs 26.0). On price, ratings volume, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
GIR Calc holds the better App Store score, 4.8 against 3.7. Both are backed by a comparable volume of ratings — 5 and 9 respectively. Written reviews point the same way: 100% of GIR Calc's written reviews are positive against 67% of PREP Self's.
GIR Calc ships an update every 4 months, PREP Self daily. The most recent releases landed on September 15, 2026 and September 21, 2026 respectively.
| Parameter | GIR Calc | PREP Self |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5 ratings) — better | 3.7 (9 ratings) |
| Positive reviews | 100.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 5 | 9 — better |
| Update frequency | Every 4 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 3 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Nicholas Wells | American Academy of Pediatrics |
Customer experience
GIR Calc
PREP Self
In-app purchases
GIR Calc
No in-app purchases
PREP Self
No in-app purchases
