# Leaf Doctor

> Plant disease assessment tool using image analysis to quantify diseased tissue percentage. (iPhone/iPad app by University of Hawaii.)

- Source: https://appshunter.io/ios/app/leaf-doctor/id874509900 (this page in markdown: same URL + `.md`)
- Developer: [University of Hawaii](https://appshunter.io/developer/424938874)
- Category: Education
- Price: Free
- Rating: 1.90/5 from 22 App Store ratings · 18 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 3 MB
- Languages: American English
- Released: 2014-05-08
- Data updated: 2026-06-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/leaf-doctor/id874509900/reviews.md

## What is Leaf Doctor?

The Leaf Doctor performs quantitative assessments for plant diseases on plant organs such as leaves. Users collect or submit photographs of diseased plant organs and calculate the percentage of diseased tissue. Through a user’s touching of the device screen, the algorithm employs user-specified values for up to eight colors of healthy tissues in the photograph. The color of each pixel is then evaluated for its distance from the healthy colors and assigned a status of either healthy or diseased. Users may slide a threshold bar until satisfied that diseased tissues are represented accurately before the percentage calculation. The assessment data and photographs may be sent by e-mail to any recipients. Instructions for using the app are provided on the About screen. The Leaf Doctor was produced by the University of Hawaii at Manoa, College of Tropical Agriculture and Human Resources.

## Key features

- Quantitative plant disease assessment
- Image analysis for diseased tissue percentage
- User-defined healthy color parameters
- Pixel color evaluation algorithm
- Adjustable threshold for accuracy
- Emailing of assessment data and photos

## Recent user reviews (10 of 18)

All indexed reviews: https://appshunter.io/ios/app/leaf-doctor/id874509900/reviews.md

### 4/5 — Useful for Ag professionals

*2025-12-10, version 1.1*

This app is helpful for quickly quantifying the severity of disease lesions on plant tissue for use in determining treatment thresholds.

### 1/5 — Confusing

*2025-07-09*

I genuinely have no idea how to use this app.

### 1/5 — Doesn’t work

*2022-10-13, version 1.1*

The app tells me everything is healthy. No matter the threshold, no matter the plant. Some of the plants I KNOW are sick. App doesn’t work.

### 5/5 — Read the description folks

*2022-06-09, version 1.1*

If you want a diagnosis and assistance with control, see your local county extension agent. If you need to quantify the % leaf area containing lesions using an iPad then use this. Glad this is available. I am going to try it out and see if it can assist technicians with conducting ratings.

### 3/5 — My Aloe plant

*2022-05-03, version 1.1*

There is something wrong with my Aloe and I figured that this app could tell me what was wrong with it and how to fix it. Instead, it told me that my plant was healthy when it obviously is not.

### 1/5 — Leaf Doctor.

*2021-09-17, version 1.1*

As above review, no instructions, all leafs have same score healthy or not. 
Terrible app.

### 1/5 — Useless, does not work.

*2021-09-14, version 1.1*

I scanned the leaves of an avocado tree that I know is failing, the app said that it is 100% healthy.

### 1/5 — Photo of a dead leaf was described as healthy 🤣🤣🤣

*2021-04-22, version 1.1*

Lol, it said the photo a dead leaf on my parlour palm was healthy.

### 1/5 — Waste of time

*2021-03-11, version 1.1*

Keeps coming back 100% healthy every time yet leaves are clearly half dead and half eaten away!

### 1/5 — Who can read the instructions

*2021-01-31, version 1.1*

Why are the instructions in grey?  They are small font and hard to read. At least, if they were in black I could read them.

## Frequently asked questions about Leaf Doctor

### How does Leaf Doctor identify plant diseases?

Leaf Doctor analyzes photographs of plant organs. It uses a user-defined color palette for healthy tissue to evaluate each pixel's color and classify it as healthy or diseased, calculating the percentage of affected area.

### Can I adjust the accuracy of Leaf Doctor's disease assessment?

Yes, users can slide a threshold bar within the app to fine-tune the accuracy of the diseased tissue representation before the percentage calculation is finalized.

### What information can I share from Leaf Doctor?

You can email the assessment data, including the calculated percentage of diseased tissue, along with the original photographs of the plant organs to any recipient.

### Where can I find instructions for using Leaf Doctor?

Detailed instructions for using the app are provided on the 'About' screen within Leaf Doctor itself.

### What devices does Leaf Doctor support?

Leaf Doctor is available for iPhone and iPod devices.

### How often is Leaf Doctor updated?

The latest version of Leaf Doctor is 1.1, which was last updated on October 24, 2017. The app was initially released on May 8, 2014.

### What is the user rating for Leaf Doctor?

Leaf Doctor has a user rating of 1.9 stars based on 22 ratings.

### Does Leaf Doctor have ads?

No, Leaf Doctor does not contain advertisements.

## Version history (last 2 releases)

### 1.1 — 2017-10-24

This app has been updated by Apple to display the Apple Watch app icon.

Compatible with iOS 11

### 1.0 — 2014-05-08

No release notes.

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## More apps by University of Hawaii

- [Loko I'a](https://appshunter.io/ios/app/loko-ia/id718491707)
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All apps by University of Hawaii: https://appshunter.io/developer/424938874

## Related topics

[leaf doctor](https://appshunter.io/ios/topics/leaf-doctor)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*