Acid Plus Downloads & RevenueAcid Plus - The ABG Calculator · App Store
Not in any tracked top chart right now.
Updated 9 Nov 2026 · rankings refresh through the day
DeveloperFree Radical Software
CategoryMedical
PriceFree
Released
Rating★ 4.6 (11)
Version3.3.1
Age rating17+
First seen by us
17 Oct 2026
Installs (est.)10k+ worldwide
Acid Plus - The ABG Calculator update history & changes
Last change · 4 events since 21 Dec 2008Full timeline ↓Full timeline · 3 events in the last 12 months
- 📈Acid Plus - The ABG Calculator dropped out of every chart we trackLast seen 16 Oct
- 🆕Acid Plus - The ABG Calculator first spotted by AppInsider#83 in Top Grossing · Medical · Japan
- 🆕Acid Plus - The ABG Calculator released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
4.6 ★
11 ratings
Measured
Acid Plus - The ABG Calculator on the App Store
App details
App ID
300521236
Publisher
Free Radical Software, LLC
On the store since
Dec 2008
17 years on the store
Minimum OS
iOS 14.1+
iPhone 6s and later
Devices
iPhone · iPad
Universal purchase
Content rating
17+
1 content note below
Languages
1
EN
Size
27 MB
Also listed in
Health & Fitness
Content notesFrequent/Intense Medical/Treatment Information
Acid Plus - The ABG Calculator downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
4.6 ★
11 ratings
Measured
Ratings
11
Measured
About Acid Plus - The ABG Calculator
Designed, programmed, and used by two internal medicine docs, Acid Plus is an essential tool for healthcare professionals who need quick, detailed, and easy-to-interpret acid-base results from ABGs and metabolic panels.
Ideal for MDs, PAs, NPs, RNs, RTs, EMTs, and med students, everything you need for acid-base calculations is put right in the palm of your hand. No more clunky ABG websites or guesswork.
With an intuitive design and easy-to-read display, Acid Plus makes it a breeze to answer even the most complex acid-base problems in seconds. Just turn the device to landscape view to get a colorful graph with an arrow highlighting the disorder.
*** What Others Say **************
• "This is certainly the best ABG calculator that we have seen so far on the iPhone and iPod Touch."
- Firas Salim, www.pda4peds.com
• "If you are practicing medicine and own an iPhone, you need to have it."
- Igor Kovic, MD, www.ivor-kovic.com
• "Interpreting the ABG and electrolytes to understand the acid-base status in my patients just turned from a chore into something immensely enjoyable. I cannot help smiling whenever I start this application."
• "This program is awesome! You have no idea how much this helps. Thank you so much."
********************************
Features:
• Fast, accurate input using the dial
• Primary calculations including partial and complete compensations using anion gap with delta delta
• International support for kPa
• Ability to discern complex acid/base problems with secondary disorders
• See the anion gap and delta delta displayed on-screen with metabolic acidoses
• Detailed views listing common causes of the primary acid-base disorder
• On-the-fly derivation of anion gap, delta-delta, and base excess
• Rotating your device right or left to landscape view reveals a colorful interactive acid-base graph
• Interactive graph helps visualize acid-base disorders quickly and powerfully
• Set your own institution's anion gap easily for personalized results
• Save and recall your most recent ABG for quick review
• Works on iPhone and iPad
If you like the program please rate it. If you have any concerns or find any bugs please contact us at [email protected]
DISCLAIMER: Please consider that the results provided by this program are intended to supplement but not substitute for the expertise and clinical judgment of a healthcare professional. The results and accompanying educational material are provided as is, and Free Radical does not warrant that they are accurate or up to date, although that is certainly our goal.
Ideal for MDs, PAs, NPs, RNs, RTs, EMTs, and med students, everything you need for acid-base calculations is put right in the palm of your hand. No more clunky ABG websites or guesswork.
With an intuitive design and easy-to-read display, Acid Plus makes it a breeze to answer even the most complex acid-base problems in seconds. Just turn the device to landscape view to get a colorful graph with an arrow highlighting the disorder.
*** What Others Say **************
• "This is certainly the best ABG calculator that we have seen so far on the iPhone and iPod Touch."
- Firas Salim, www.pda4peds.com
• "If you are practicing medicine and own an iPhone, you need to have it."
- Igor Kovic, MD, www.ivor-kovic.com
• "Interpreting the ABG and electrolytes to understand the acid-base status in my patients just turned from a chore into something immensely enjoyable. I cannot help smiling whenever I start this application."
• "This program is awesome! You have no idea how much this helps. Thank you so much."
********************************
Features:
• Fast, accurate input using the dial
• Primary calculations including partial and complete compensations using anion gap with delta delta
• International support for kPa
• Ability to discern complex acid/base problems with secondary disorders
• See the anion gap and delta delta displayed on-screen with metabolic acidoses
• Detailed views listing common causes of the primary acid-base disorder
• On-the-fly derivation of anion gap, delta-delta, and base excess
• Rotating your device right or left to landscape view reveals a colorful interactive acid-base graph
• Interactive graph helps visualize acid-base disorders quickly and powerfully
• Set your own institution's anion gap easily for personalized results
• Save and recall your most recent ABG for quick review
• Works on iPhone and iPad
If you like the program please rate it. If you have any concerns or find any bugs please contact us at [email protected]
DISCLAIMER: Please consider that the results provided by this program are intended to supplement but not substitute for the expertise and clinical judgment of a healthcare professional. The results and accompanying educational material are provided as is, and Free Radical does not warrant that they are accurate or up to date, although that is certainly our goal.
Latest updates
3.3.1
Thank you for using Acid Plus!
- fixed picker for smaller screen sizes
We continue to make other minor bug improvements