Ada Health

Ada is a symptom-assessment app that works like a structured medical interview. You describe how you feel, and Ada asks a series of adaptive follow-up questions — narrowing possibilities the way a clinician’s intake would — before producing a report of possible causes ranked by likelihood, plus advice on how urgently to seek care. It is one of the most widely used symptom checkers, with tens of millions of assessments completed.

What distinguishes Ada from typing symptoms into a search engine is its medical knowledge base, built and maintained with doctors and continuously reviewed. Rather than surfacing the scariest possible result, it weighs your specific answers, age, and history to give a calibrated, evidence-based picture. The company, Ada Health, is based in Berlin and also licenses its engine to health systems and insurers.

Ada is explicitly a triage and information tool, not a diagnostic device — it helps you decide whether to self-care, see a GP, or seek urgent help.

Key Features

• Adaptive, doctor-designed symptom questionnaire
• Condition assessment with causes ranked by likelihood
• Clear urgency guidance (self-care vs see a doctor vs urgent)
• Personal health profile and history tracking
• Available in multiple languages
• Enterprise engine for health systems and insurers

Pricing

• Free: Full personal symptom checker on web and mobile
• Enterprise: Licensed API and integrations for healthcare organizations

Best For

Anyone with non-emergency symptoms who wants a reliable, evidence-based first assessment before deciding whether to book an appointment — a calmer, more structured alternative to searching symptoms online.

Limitations

Ada cannot diagnose or replace a clinician, and its accuracy depends entirely on how well you describe your symptoms. In a real emergency you should call local emergency services rather than open the app. Its fixed questionnaire can also feel rigid next to newer conversational AI health assistants, though that structure is precisely what keeps its guidance grounded.