SafeLocal vs Master Anesthesia
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Dosage calculator for local anesthetics
- Adjusts dose by patient weight
- Includes anesthesia with or without epinephrine
- Accounts for comorbidities
- Calculates remaining safe dose
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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.
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.
- 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
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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
Verdict
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
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.
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.
SafeLocal ships an update every 6 months, Master Anesthesia weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | SafeLocal | Master Anesthesia |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (47 ratings) | 4.9 (2K ratings) — better |
| Positive reviews | 30.0% of reviews | 78.5% of reviews — better |
| Number of ratings | 47 | 2K — better |
| Update frequency | Every 6 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Best chart rank | — | #194 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.5 — better | 15.1 |
| Further details — not scored | ||
| Size | 1 MB | 69 MB |
| Age rating | 17+ | 12+ |
| Developer | Johns Hopkins Mobile medicine | Matthew Willis |
Customer experience
SafeLocal
Master Anesthesia
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
SafeLocal
No in-app purchases
Master Anesthesia
- Master Anesthesia Contributor7 Days trial$69.991 Year
- Full Access CE7 Days trial$449.001 Year
- Module Unlock$24.99
- Course Unlock$99.00
- Master Anesthesia One Time$99.99
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- One-Time$149.99
- Course Unlock$449.00
Questions
Is SafeLocal free?
Is Master Anesthesia free?
Which has better reviews, SafeLocal or Master Anesthesia?
Do SafeLocal or Master Anesthesia have ads?
Which is updated more often, SafeLocal or Master Anesthesia?
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