Indigo vs ACP MKSAP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Indigo | ACP MKSAP |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (15 ratings) — better | 4.2 (17 ratings) |
| Positive reviews | 66.7% of reviews — better | 57.1% of reviews |
| Number of ratings | 15 | 17 — better |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 23 MB | 540 MB |
| Age rating | 17+ | 17+ |
| Developer | INDIGOMED LLC | American College of Physicians |
Customer experience
Indigo
ACP MKSAP
In-app purchases
Indigo
No in-app purchases
ACP MKSAP
- Non-member in-app price$999.991 Year









