# Indigo vs Plumb's | Standards

The clearest difference is monetization model: Indigo at free against Plumb's | Standards's subscription. Indigo also leads on review sentiment (67% vs 56%) and iOS requirement (12.0 vs 15.1). Plumb's | Standards's advantage is rating (4.9 vs 4.5) and ratings volume (3.4K vs 15). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Plumb's | Standards holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: Plumb's | Standards has 3.4K ratings behind it against 15, so its average is the more settled of the two. Written reviews complicate that: 67% of Indigo's written reviews are positive against 56% of Plumb's | Standards's, so the app with the better star average is not the one people write more warmly about.

Indigo ships an update every 2 months, Plumb's | Standards every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Indigo | Plumb's | Standards |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (15 ratings)](https://appshunter.io/ios/app/indigo-medical-reference/id1384600751/reviews) | **[4.9 (3.4K ratings)](https://appshunter.io/ios/app/plumbs-standards/id1556729700/reviews)** |
| Number of ratings | 15 | **3.4K** |
| Positive reviews | **66.7% of reviews** | 55.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | **Free** | Subscription |
| Size | 23 MB | 62 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [INDIGOMED LLC](https://appshunter.io/developer/1245963707) | [Brief Media](https://appshunter.io/developer/1018418856) |

## 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


### Plumb's | Standards

[App page](https://appshunter.io/ios/app/plumbs-standards/id1556729700)

This app provides trusted veterinary clinical decision support, integrating comprehensive drug information and treatment guidance. It offers tools for diagnosis, treatment, and client education, designed for veterinary professionals.

**Highlights:** Veterinary drug and dosing information, Drug interaction checker, Conversion calculator, Diagnosis and treatment monographs, Management algorithms, Differential diagnosis lists, Client education handouts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Super helpful
- 👍 Excellent resource
- 👍 Very helpful and easy to use
- 👍 Worth the price
- 👍 Amazing app

**What reviewers complain about**

- 🐛 Signing in issues
- 🐛 Impossible to get an answer from Support
- 💰 Disappointed - Careful before purchasing!
- 🐛 No calculator
- 🐛 Imposible to renew

**Reported bugs**

- Signing in issues
- Crashing
- Login/password reset problems
- Compatibility issues on iPad

**Requested features**

- Add calculator function
- Improve renewal/subscription management


## Frequently asked questions

### Is Indigo free?

Indigo is free to download, with no in-app purchases.

### Is Plumb's | Standards free?

Plumb's | Standards is free to download, with no in-app purchases.

### Which has better reviews, Indigo or Plumb's | Standards?

Plumb's | Standards is rated higher. Indigo averages 4.5 out of 5 from 15 ratings, while Plumb's | Standards averages 4.9 from 3.4K ratings.

### Do Indigo or Plumb's | Standards have ads?

Neither Indigo nor Plumb's | Standards shows ads.

### Which is updated more often, Indigo or Plumb's | Standards?

Indigo ships an update every 2 months, and Plumb's | Standards every 3 weeks. Most recently, Indigo was updated on October 24, 2026 and Plumb's | Standards on October 25, 2026.

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