Boards are hard. Prep shouldn't be.
Built for internal medicine, and only internal medicine — 1,277ABIM-blueprint questions written by internists who round too, with full teaching explanations, weak-system analytics, and one-click Anki export.
Live board-style questions · ABIM blueprint
Get board ready.
Test in timed or tutor mode, review with full explanations, and track your weak systems — then export any card straight to Anki.
- Timed, untimed, and tutor-mode sessions
- Full teaching explanations on every question
- Analytics that surface your weakest systems first
- Flashcards, notes, and one-click Anki export
A 67-year-old woman on hydrochlorothiazide is brought in with confusion and a witnessed seizure.
Na+ 118 mEq/L · Urine osm 420 mOsm/kg · Euvolemic on exam
3,000+ topics, handwritten on service.
Every topic is written and edited by practicing internists — concise enough for the elevator ride, complete enough for the attending's follow-up question.
The approach comes first.
Every topic opens with how to think about the chief complaint — the bedside framework internists actually use, no AI required. The differential you can build yourself is the one you'll have on boards, on call, and when the attending asks.
- Stepwise approaches to the classic chief complaints
- Structured the way you present — Hx, exam, workup
- Physical exam signs and procedures, step by step
- Is it real? Serum osm + glucose — rule out pseudohyponatremia.
- Volume status. Hypo-, eu-, or hypervolemic on exam.
- Urine osm. <100: primary polydipsia. >100: ADH is active.
- Urine Na. <20: volume depletion. >40: SIADH, thiazides.
Treat the cause — not just the number.
Free to round with. Fair to board with.
The full reference is free, forever. Upgrade when you're ready for unlimited QBank practice and deeper analytics.
Indigo Basic
Free
Forever
- 3,000+ handwritten topics
- Flashcards
- 150+ medical calculators
- Step-by-step procedure instructions
- Indigo community discussion board
Indigo Plus
$100/yr
Just $8.33/mo · save 36%
- Everything in Basic
- Personal mastery insights and learning analytics
- 1,277 ABIM-blueprint QBank questions
- Question bank analytics
- Early access to upcoming features
Institution
Custom
Group pricing
- Group discounts
- Portal for institutional documents & phone directory
- Customizable institution-based features
- Dedicated support team
- Long-term collaboration
Written by the people who use it.
Indigo is designed, written, and edited by physicians — for the interns and residents we were.
David Fink, M.D.
CEO & Co-founder
Editor in Chief
Wei Yang, M.D.
CTO & Co-founder
Diana Wong Aiken, M.D.
Core Content Editor
Quality Improvement