Disease Atlas: See medicine differently

Why visual

Pattern recognition is a visual skill. Most references are walls of text.

A clinician recognises scarlet fever before the swab result returns: the sandpaper rash, the strawberry tongue, the pale ring around the mouth. That skill is built by seeing patterns repeatedly, in the right place on the body. Disease Atlas is organised around that act of seeing. Every condition is a body map, and every marker on it is a finding with four short answers.

01

Where

A region of the body, with a numbered marker anchored to it.

02

What it looks like

A plain description of the appearance, with a drawing or an AI-generated teaching image where one is available.

03

Why it happens

The pathophysiology in a sentence or two, not a chapter.

04

The exam pearl

What to look for on examination, and how it separates look-alikes.

One finding, as the app shows it

Scarlet Fever: Flushed cheeks with circumoral pallor

Where: Face / Perioral area
What it looks like: Red cheeks with a pale ring / spared area around the mouth.
Why it happens: Erythrogenic exotoxins from group A Streptococcus trigger a systemic inflammatory skin response.
Exam pearl: Flushed cheeks with circumoral pallor help distinguish scarlet fever from other viral rashes.

Body maps

Every condition starts as a map.

Choose a condition and select a marker. The words are the app's own entries, unchanged.

Look-alikes

Two rashes. One table. The difference, row by row.

Seventeen curated comparisons put confusable conditions side by side, each with a memory hook. Three of them, from the Professional version:

Scarlet fever vs Kawasaki diseaseMeasles vs RubellaImpetigo vs Cellulitis

Choose a comparison	Scarlet fever	Kawasaki disease
Rash / skin	Diffuse sandpaper rash, Pastia lines, later peeling	Polymorphous rash; red/swollen hands or feet; peeling is a late clue
Mucosa	Strawberry tongue + exudative pharyngitis	Strawberry tongue + cracked red lips, non-exudative
Eyes	Normal	Bilateral non-exudative conjunctivitis
Nodes	Tender anterior cervical	Unilateral cervical node ≥1.5 cm
Red flags	Rheumatic fever, post-strep GN	Coronary artery aneurysms

Memory hook

Both can cause strawberry tongue. Scarlet fever favours streptococcal pharyngitis and a sandpaper rash. Kawasaki combines persistent fever with characteristic eye, lip, limb or node findings; do not wait automatically for day 5 or late peeling.

In the free guide, the same pair in plain language: Both can cause a red, bumpy tongue. The tongue alone cannot tell them apart.

Choose a comparison	Measles	Rubella
Prodrome	High fever + the 3 C's (cough, coryza, conjunctivitis)	Mild or absent
Rash	Blotchy, confluent, spreads head-to-toe	Fine pink, discrete, fades fast
Enanthem	Koplik spots (pathognomonic)	Forchheimer spots (non-specific)
Nodes	Generalised	Tender posterior / suboccipital (hallmark)
Red flags	Pneumonia, encephalitis, SSPE	Congenital rubella (maternal infection)

Memory hook

A miserable child with cough, coryza, conjunctivitis and Koplik spots = measles. A mild rash whose main clue is tender nodes behind the ears = rubella — the real danger is to the unborn.

In the free guide, the same pair in plain language: A mild rash can still matter in pregnancy. Appearance alone cannot confirm either infection.

Choose a comparison	Impetigo	Cellulitis
Skin layer	Superficial epidermis	Deep dermis / subcutis
Appearance	Honey-crusted erosions, around mouth/nose	Spreading warm, tender erythema
Feel	Often itchy; can be sore	Tender, hot
Systemic	Usually well	May have fever / malaise
Red flags	Post-strep GN, SSSS	Necrotising fasciitis, sepsis

Memory hook

Golden crusts sitting on the surface = impetigo. A hot, tender, spreading red area = cellulitis — and pain out of proportion should make you think necrotising infection.

In the free guide, the same pair in plain language: Surface crusts and deeper swelling are useful clues, but infections can overlap.

A sign, up close

Eighty signs that cut across conditions.

A sign page shows what the sign looks like, then every condition in the atlas where it appears, grouped by specialty. The image is zoomable and, when it is photorealistic, labelled as AI-generated.

A zoomable image, labelled when it is AI-generated
What it looks like, in plain words
Seen in these conditions, grouped by specialty

The Goitre sign page in Disease Atlas: a labelled AI-generated image, a plain description and the conditions it appears in

Inside the app

Four tabs. Nothing in the way.

Atlas, Symptoms, Saved and Settings. Real screens from the current build, shown as captured.

The Atlas tab: a search field and specialty categories with condition counts

01

Browse ten specialties, or describe what you see.

Search understands plain language as well as clinical terms. “redness with crust” finds the honey-coloured crust sign and impetigo; “koplik spots” finds measles. A correctly typed clinical term is never “corrected”.

Free

The Scarlet fever page: a plain summary, an at-a-glance strip and the start of the body map

02

Every condition opens with a plain summary and an at-a-glance strip.

Then its body map and key features. In the free guide, a when-to-worry reference lists warning signs with explicit care destinations.

Free

The body map scrolled down to the numbered Key features list

03

Numbered markers list the key features.

Tap a marker or a row to read the finding: what it looks like, why it happens, and the exam pearl. Pinch to zoom.

Free

The Goitre sign page with its image and the conditions it appears in

04

Eighty signs, each linked to the conditions where it appears.

Grouped by body area: mouth and throat, face and eyes, hands and feet, scalp, hair and nails, the diaper and genital area, skin and rashes, and the whole body.

Free

The Professional version of the Scarlet fever page with Body Map, Notes, Workup and Protocol tabs

05

Pro switches to the Professional version.

Clinical findings, study notes, a workup list and a management protocol for every condition, plus the AI-generated image library. The free guide stays free.

Pro

Capabilities

Everything the app does. Nothing it doesn't.

Every item below is in the current build. Image coverage varies by entry.

01Two reading modes: The Patient & family guide is free: plain-language explanations, warning signs and drawn illustrations. The Professional version, with Pro, adds clinical findings, study notes, workup and management protocols.
02Body maps: 255 conditions and 1,013 findings, each anchored to a place on the body and numbered.
03Signs: 80 cross-cutting signs grouped by body area, each linked to every atlas condition that shows it.
04Compare: 17 curated look-alike pairs with memory hooks, plus a custom comparison of any two conditions.
05Plain-language search: Describe what you see or type the clinical term. Exact clinical terms are never corrected.
06When to worry: A per-condition reference of warning signs with explicit care destinations. It is a reference, not a symptom checker: it asks no questions and names no condition.
07Sources: More than a thousand cited references across the entries, listed on the pages they support.
08Offline: The whole reference is bundled with the app. No account, no sign-in.
09Two languages: English and Turkish, switched instantly in Settings.
10Saved: Bookmarks and recently viewed entries, kept on the device.
11Images, labelled: Photorealistic images are AI-generated teaching illustrations and are labelled as such. Where no image is available, a drawing or the written explanation is shown.
12iPhone: iOS 17 or later. Light, dark and system appearance.

A better way to learn

Anatomy, sign, morphology, disease. One unbroken chain.

Clinical reasoning runs along a chain: a place on the body, a sign at that place, the morphology that makes it that sign and not another, and the conditions in which it occurs. Most resources cut the chain into separate books. Disease Atlas keeps it whole, so you can travel in any direction: from a condition to its signs, from a sign to every condition that shows it, from two look-alikes to the row that separates them.

Region
Mouth & throatOne of seven body areas
Sign
Strawberry tongueOne of 80 signs
Morphology
The tongue develops a white coat pierced by swollen red papillae (white strawberry), then sheds to a beefy-red surface with prominent papillae.What it looks like
Conditions
Scarlet fever · Kawasaki disease · Toxic shock syndromeEvery atlas entry that shows it

Privacy and responsibility

Nothing leaves your phone.

Private by design

No account and no sign-in. No advertising, analytics or tracking. Your bookmarks, recent entries and settings stay on the device. Pro payments go through Apple; the developer never sees your card.

For learning, not diagnosis

Disease Atlas is an educational reference. It does not diagnose, treat or triage, and it never names a condition you or anyone else might have. Use clinical judgement and local guidance, and seek medical advice before medical decisions.

Honest images

Photorealistic images are AI-generated teaching illustrations, labelled in the app. They are not photographs of diagnosed patients and can contain inaccuracies. Entries cite their sources.

Read the privacy policy Support and subscriptions

Coming to the App Store for iPhone.

Disease Atlas is being prepared for release. The Patient & family guide will be free. Disease Atlas Pro, a monthly subscription, adds the Professional version and the AI-generated image library. The launch date will be announced here.

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See medicine differently.

Pattern recognition is a visual skill. Most references are walls of text.

Where

What it looks like

Why it happens

The exam pearl

Every condition starts as a map.

Flushed cheeks with circumoral pallor

Strawberry tongue

Exudative pharyngitis

Tender anterior cervical lymph nodes

Sandpaper rash and Pastia lines

Conjunctivitis (one of the 3 C's)

Koplik spots

Generalised lymphadenopathy

Cephalocaudal maculopapular rash

Bilateral non-exudative conjunctivitis

Cracked red lips & strawberry tongue

Unilateral cervical node ≥1.5 cm

Polymorphous rash

Palm/sole erythema, then peeling

Two rashes. One table. The difference, row by row.

Four tabs. Nothing in the way.

Browse ten specialties, or describe what you see.

Every condition opens with a plain summary and an at-a-glance strip.

Numbered markers list the key features.

Eighty signs, each linked to the conditions where it appears.

Pro switches to the Professional version.

Everything the app does. Nothing it doesn't.

Anatomy, sign, morphology, disease. One unbroken chain.

Nothing leaves your phone.

Private by design

For learning, not diagnosis

Honest images

Coming to the App Store for iPhone.