Comparison

SafeLocal vs Master Anesthesia

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

Head to head
About

SafeLocal

This app simplifies safe local anesthetic dosage calculations for medical professionals. It accounts for patient weight, disease processes, anesthetic mixtures, and additives to determine maximum safe doses and track remaining amounts, eliminating manual calculations.

Highlights
  • Dosage calculator for local anesthetics
  • Adjusts dose by patient weight
  • Includes anesthesia with or without epinephrine
  • Accounts for comorbidities
  • Calculates remaining safe dose
Features
Read full description

SafeLocal is an application developed by Johns Hopkins that makes calculating safe dosages of local anesthetic quick and easy for anesthesiologists, surgeons, and other medical providers. It seamlessly incorporates patient weight, disease processes, mixtures of local anesthetic, and presence or absence of additives, to calculate the maximum safe dose of local anesthetic without the hassle of going through the calculations by hand, all while tracking how much of the maximum safe dose has been used up and how much is left over for safe administration. FEATURES: ● Dosage calculator for local anesthetics, including complex mixtures and non-standard concentrations. ● Adjusts maximum safe dose by patient weight (lbs or kg). ● Choice between anesthesia with or without epinephrine. ● Option to add comorbidities such as extremes of age, severe renal dysfunction, hepatic dysfunction, or advanced heart failure, with automatic adjustment of maximum safe dose. ● Ability to calculate remaining safe dose of anesthesia for anesthesiologist or surgeon to administer based on how much has already been administered. Calculations based on Chapter 36 (Local Anesthesia) of Miller’s Anesthesia, 8th Edition. Adjustment for comorbidities based on the 2004 publication “Maximum Recommended Doses of Local Anesthetics: A Multifactorial Concept” by Rosenberg et al. The information provided by the application is based on expert opinion. It is to be used as a recommendation only. Clinical judgment by a physician is required in every situation. The user assumes all responsibility for decisions made with the information provided by this app. Project produced at the Johns Hopkins University School of Medicine by Jonathan D. Lin, M.D. and Jean-Pierre P. Ouanes, D.O. Funded generously by the Johns Hopkins Bayview Patient Safety Pyramid Grant Program. Adapted from the 2017 version of the American Society of Regional Anesthesia and Pain Medicine Checklist for Managing Local Anesthetic Systemic Toxicity. Source: Neal JM, Woodward CM, Harrison TK. The American Society of Regional Anesthesia and Pain Medicine Checklist for Managing Local Anesthetic Systemic Toxicity: 2017 Version. Reg Anesth Pain Med. 2018 Feb;43(2):150-153.

About

Master Anesthesia

This app provides anesthesia professionals with quick answers to common questions. It highlights anesthetic implications of diseases, surgical cases, and drugs, and includes a searchable acronym list and a comprehensive calculator for dosages, blood loss, and fluid management.

Highlights
  • Disease anesthetic implications
  • Surgical case anesthetic implications
  • Drug anesthetic implications
  • Searchable acronym list
  • Local anesthetic dosage calculator
  • Blood volume and loss calculator
  • Fluid and equipment calculations
Features
Currently charting
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Master Anesthesia helps anesthesia professionals find answers quickly to common questions. The primary purpose is to provide clinicians with the highlighted anesthetic implications of specific diseases, surgical cases, and drugs. In addition, a searchable list of over 1,000 acronyms is provided. A calculator has also been created to assist with maximum local anesthetic dosage, estimated blood volume, maximum allowable blood loss, fluid calculations, equipment, vitals, and more. Subscription and Purchase Options: Clinical Access Pro: $69.99/year – Full access to all clinical tools and updates. Auto-renews yearly. Full Access CE: $449.99/year – Full access to Clinical Access Pro + everything CRNAs need for their 4-year cycle. More than 150 pre-approved Class A (Mac-Ed) credits, and over 100 courses to choose from. Payment & Renewal: Payment will be charged to your Apple ID account at the time of confirmation. Annual subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. You can manage or cancel your subscription anytime in your Apple ID account settings. For more details on managing subscriptions, visit: https://support.apple.com/en-us/118428 Website: https://masteranesthesia.com Terms of Use: https://masteranesthesia.com/terms-of-service Privacy Policy: https://masteranesthesia.com/privacy-policy-and-disclaimer

Screenshots

SafeLocal4 screens
Master Anesthesia4 screens

Verdict

The call

The clearest difference is review sentiment: Master Anesthesia at 78% against SafeLocal's 30%. Master Anesthesia also leads on rating (4.9 vs 3.6) and update cadence (weekly vs every 6 months). SafeLocal's advantage is in-app purchases (none vs 7) and iOS requirement (13.5 vs 15.1). On price, ads and device support 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. Master Anesthesia sells 7 in-app purchases, starting at $69.99 per year. SafeLocal asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Master Anesthesia holds the better App Store score, 4.9 against 3.6. That said, the two scores are not equally well evidenced: Master Anesthesia has 2K ratings behind it against 47, so its average is the more settled of the two. Written reviews point the same way: 30% of SafeLocal's written reviews are positive against 78% of Master Anesthesia's.

UpkeepUpdate frequency

SafeLocal ships an update every 6 months, Master Anesthesia weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard8 real differences · 3 level
SafeLocal versus Master Anesthesia: the parameters behind the verdict, then further details
ParameterSafeLocalMaster Anesthesia
PriceFreeFree
Rating3.6 (47 ratings)4.9 (2K ratings) — better
Positive reviews30.0% of reviews78.5% of reviews — better
Number of ratings472K — better
Update frequencyEvery 6 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
Best chart rank—#194 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.5 — better15.1
Further details — not scored
Size1 MB69 MB
Age rating17+12+
DeveloperJohns Hopkins Mobile medicineMatthew Willis

Customer experience

SafeLocal

All ratings47 ratings
Positive59.6%
Neutral8.5%
Negative31.9%
Written reviews20 reviews
Positive30.0%
Neutral25.0%
Negative45.0%

Master Anesthesia

All ratings1,995 ratings
Positive97.7%
Neutral0.7%
Negative1.6%
Written reviews93 reviews
Positive78.5%
Neutral5.4%
Negative16.1%

Bugs and requests

SafeLocal

Not enough reviews yet to summarise bugs or requests.

Master Anesthesia

Reported bugs

2 issues
  • Incorrect terminology and credentials on the starting screen
  • Inconsistent behavior when accessing content after subscription changes

Requested features

3 requests
  • Offline access to content
  • Apple Watch integration for the calculator
  • More detailed and up-to-date information on procedures and conditions

In-app purchases

None

SafeLocal

No in-app purchases

7 purchases

Master Anesthesia

Subscriptions2
  • Master Anesthesia Contributor7 Days trial$69.991 Year
  • Full Access CE7 Days trial$449.001 Year
One-time5
  • Module Unlock$24.99
  • Course Unlock$99.00
  • Master Anesthesia One Time$99.99
Show 2 more
  • One-Time$149.99
  • Course Unlock$449.00

Questions

Is SafeLocal free?
SafeLocal is free to download, with no in-app purchases.
Is Master Anesthesia free?
Master Anesthesia is free to download, with in-app purchases available.
Which has better reviews, SafeLocal or Master Anesthesia?
Master Anesthesia is rated higher. SafeLocal averages 3.6 out of 5 from 47 ratings, while Master Anesthesia averages 4.9 from 2K ratings.
Do SafeLocal or Master Anesthesia have ads?
Neither SafeLocal nor Master Anesthesia shows ads.
Which is updated more often, SafeLocal or Master Anesthesia?
SafeLocal ships an update every 6 months, and Master Anesthesia weekly. Most recently, SafeLocal was updated on October 24, 2026 and Master Anesthesia on October 25, 2026.

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