Comparison

Indigo vs ACP MKSAP

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

Head to head
About

Indigo

A comprehensive medical reference for internal medicine, covering conditions from anemia to HIV/AIDS. It offers guidance for managing common ward and ICU cases, plus essential tips for new residents on consults and H&Ps. Designed for educational purposes for medical students and residents.

Highlights
  • Internal medicine management
  • Anemia and lab abnormalities
  • Chronic condition management (e.g., AIDS/HIV)
  • Ward and ICU case management
  • Tips for new residents
  • Consultation and H&P guidance
Features
Read full description

This is a comprehensive mobile medicine reference that includes management of everything in internal medicine ranging from anemia, lab abnormalities, to complicated chronic conditions such as AIDS/HIV. This includes all the common cases you'll see on a medicine ward / ICU and how to manage them. In addition, it offers amazing tips on how to survive on being a new resident - such as how to properly call consults, how to write H&Ps etc. A must have for anyone new to residency and even anyone who's a practicing physician. THE APP DOES NOT PROVIDE MEDICAL ADVICE. The contents of this App ("Content") are for informational and educational purposes only. The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. This app is geared for further education of medical students and residents only, and is not meant to replace medical advice from a trained professional. Always seek the advice of state accredited Attendings or Subspecialists with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this App. If you think your patient may have a medical emergency, call a rapid response or appropriate code immediately. This App does not recommend or endorse any specific tests, physicians, products, procedures, opinions, or other information that may be mentioned. Reliance on any information provided in this App is solely at your own risk. THE USE OF THIS APP AND THE CONTENT IS AT YOUR OWN RISK. This App and the Content are provided on an "as is" basis. THE PROVIDERS OF THIS APP, TO THE FULLEST EXTENT PERMITTED BY LAW, DISCLAIM ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, STATUTORY OR OTHERWISE, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT OF THIRD PARTIES' RIGHTS, AND FITNESS FOR PARTICULAR PURPOSE. Without limiting the foregoing, the Providers of the App make no representations or warranties about the accuracy, reliability, completeness, currentness, or timeliness of the Content. In no event shall the Providers of the App be liable for any damages (including, without limitation, incidental and consequential damages, personal injury/wrongful death, lost profits, adverse consequences due to invasive procedures, or damages resulting from lost data or business interruption) resulting from the use of or inability to use this App or the Content, whether based on warranty, contract, tort, or any other legal theory, and whether or not the Providers of the App are advised of the possibility of such damages. The Providers of the App are not liable for any personal injury, including death, caused by your use or misuse of this App. By using this App, you agree to defend, indemnify, and hold the Providers of the App harmless from and against any claims, actions or demands, liabilities and settlements including without limitation, reasonable legal and accounting fees, resulting from, or alleged to result from, your violation of these Terms and Conditions. Questions or comments regarding this App should be submitted to: indigotheapp@gmail.com ©2025 David Fink MD, Wei Yang MD

About

ACP MKSAP

Access comprehensive internal medicine knowledge and practice exam-style questions offline. This app syncs your progress with the online version when connected to the internet. It's designed for physicians to stay updated on the latest evidence and enhance their clinical decision-making skills.

Highlights
  • Offline access to text and questions
  • Thousands of exam-like multiple-choice questions
  • Patient-based clinical scenarios
  • Syncs progress with online version
  • Includes figures, charts, and tables
  • Targets knowledge gaps
Features
Read full description

This app supplements the online version and is included with your ACP MKSAP subscription. Simply log in with your ACP or ACP MKSAP username and password. If you need assistance setting up your account, visit ACP Online. Some functionality within the app requires an active Internet connection. Your suggestions for future updates and enhanced features are welcome at mksap_editors@acponline.org. The new ACP Medical Knowledge Self-Assessment Program℠ (ACP MKSAP℠) provides you with the most current and critical information in the core of internal medicine and its subspecialties so you can stay aware of what you need to know as a practicing physician in internal medicine today. ACP MKSAP consists of well-researched text sections and thousands of exam-like multiple-choice questions along with hundreds of figures, charts, and tables to enhance your learning experience. ACP MKSAP's original, high-quality questions comprise patient-based clinical scenarios based on the latest evidence. Each question will challenge your decision-making, help you discover areas of strength, and target areas for you to update or acquire new knowledge. This app enables ACP MKSAP subscribers to read all of the text and answer all of the questions offline. When you are connected to the Internet, answers will sync automatically with the online version. The publisher of this app, the American College of Physicians, is the largest medical specialty organization in the United States with members in more than 145 countries worldwide. ACP membership includes 161,000 internal medicine physicians (internists), related subspecialists, and medical students. Internal medicine physicians are specialists who apply scientific knowledge and clinical expertise to the diagnosis, treatment, and compassionate care of adults across the spectrum from health to complex illness. Subscriber License Agreement: https://mksap.acponline.org/license

Screenshots

Indigo4 screens
ACP MKSAP1 screens

Verdict

The call

The clearest difference is in-app purchases: Indigo at none against ACP MKSAP's 1. Indigo also leads on rating (4.5 vs 4.2) and review sentiment (67% vs 57%). ACP MKSAP's advantage is update cadence (every 10 days vs every 2 months). On price, ratings volume, 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. ACP MKSAP sells 1 in-app purchase, starting at $999.99 per year. Indigo asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Indigo holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 15 and 17 respectively. Written reviews point the same way: 67% of Indigo's written reviews are positive against 57% of ACP MKSAP's.

UpkeepUpdate frequency

Indigo ships an update every 2 months, ACP MKSAP every 10 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
Indigo versus ACP MKSAP: the parameters behind the verdict, then further details
ParameterIndigoACP MKSAP
PriceFreeFree
Rating4.5 (15 ratings) — better4.2 (17 ratings)
Positive reviews66.7% of reviews — better57.1% of reviews
Number of ratings1517 — better
Update frequencyEvery 2 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size23 MB540 MB
Age rating17+17+
DeveloperINDIGOMED LLCAmerican College of Physicians

Customer experience

Indigo

All ratings14 ratings
Positive92.9%
Neutral0.0%
Negative7.1%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

ACP MKSAP

All ratings16 ratings
Positive81.3%
Neutral0.0%
Negative18.8%
Written reviews7 reviews
Positive57.1%
Neutral0.0%
Negative42.9%

In-app purchases

None

Indigo

No in-app purchases

1 purchases

ACP MKSAP

Subscriptions1
  • Non-member in-app price$999.991 Year

Questions

Is Indigo free?
Indigo is free to download, with no in-app purchases.
Is ACP MKSAP free?
ACP MKSAP is free to download, with in-app purchases available.
Which has better reviews, Indigo or ACP MKSAP?
Indigo is rated higher. Indigo averages 4.5 out of 5 from 15 ratings, while ACP MKSAP averages 4.2 from 17 ratings.
Do Indigo or ACP MKSAP have ads?
Neither Indigo nor ACP MKSAP shows ads.
Which is updated more often, Indigo or ACP MKSAP?
Indigo ships an update every 2 months, and ACP MKSAP every 10 days. Most recently, Indigo was updated on November 2, 2026 and ACP MKSAP on November 3, 2026.

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