# Indigo vs ACP MKSAP

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.

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.

## The numbers

| Metric | Indigo | ACP MKSAP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (15 ratings)](https://appshunter.io/ios/app/indigo-medical-reference/id1384600751/reviews)** | [4.2 (17 ratings)](https://appshunter.io/ios/app/acp-mksap/id6739636797/reviews) |
| Number of ratings | 15 | **17** |
| Positive reviews | **66.7% of reviews** | 57.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 23 MB | 540 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [INDIGOMED LLC](https://appshunter.io/developer/1245963707) | [American College of Physicians](https://appshunter.io/developer/371090673) |

## What reviewers say

### Indigo

[App page](https://appshunter.io/ios/app/indigo-medical-reference/id1384600751)

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:** macOS Compatibility

**In-app purchases:** none


### ACP MKSAP

[App page](https://appshunter.io/ios/app/acp-mksap/id6739636797)

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:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Non-member in-app price | $999.99 | per year |


## Frequently asked 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.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*