Loading your page…
Medical AI with numbered sources, for doctors and students
Ask the way you’d ask a senior colleague. Every answer cites the guideline or study it came from.
384 guidelines · 9 live sources · For reference and learning, not diagnosis
One account for Prognia, Ward, Suture and Osler
A chatbot gives you a fluent paragraph in seconds, and it sounds certain. But which guideline says so, from which year, for which patients? Without a source you cannot check it, and a reference that was made up looks exactly like a real one.
Osler works the other way round. It looks up the evidence first, then writes an answer in which every claim carries the number of its source.
For rate control in AF with an ejection fraction above 40%, the first choices are a beta blocker, diltiazem, verapamil or digoxin.
Which guideline? Which year? You cannot tell.
For rate control in AF with an ejection fraction above 40%, the first choices are a beta blocker, diltiazem, verapamil or digoxin.[1]
ESC 2024 · AF guidelineSource 1 · guideline
Osler never cites a source it cannot name and link.
Osler is Prognia’s medical AI for doctors and students: ask a clinical question and get an answer in which every claim is numbered to its source (384 international guidelines and 9 live sources including PubMed, Cochrane and ClinicalTrials.gov), as a reference and learning tool, not a diagnosis.
Type your question in your own words, in English, Dutch, German, French or Spanish. Osler searches its guideline library and the live sources at the same time.
The answer appears as it is written. Each statement carries a number right after the claim it supports, so you see exactly what rests on what.
Tap a number to see the guideline or study behind it, with a link to the original. Keep the answer as a Suture note, or turn it into a Ward quiz of 3, 5 or 10 questions.
1
Type your question in your own words, in English, Dutch, German, French or Spanish. Osler searches its guideline library and the live sources at the same time.
2
The answer appears as it is written. Each statement carries a number right after the claim it supports, so you see exactly what rests on what.
3
Tap a number to see the guideline or study behind it, with a link to the original. Keep the answer as a Suture note, or turn it into a Ward quiz of 3, 5 or 10 questions.
An example question, answered the way Osler answers: written as you watch, with a number after every claim. Tap a number to open its source.
Why is SABA-only treatment no longer recommended in asthma?
A short-acting β2-agonist (SABA) relieves symptoms but leaves the airway inflammation untreated, and SABA-only treatment is linked to more severe exacerbations and, with heavy use, a higher risk of asthma death . GINA therefore recommends that adults and adolescents always receive treatment containing an inhaled corticosteroid, with as-needed low-dose ICS-formoterol as the preferred reliever . A Cochrane review found that as-needed ICS-formoterol roughly halves exacerbations needing systemic corticosteroids compared with a reliever alone . In the SYGMA 1 trial, as-needed budesonide-formoterol lowered the rate of severe exacerbations by 64% compared with as-needed terbutaline .
3 sources used
This is an example answer. Osler can make mistakes, so check the sources before you rely on an answer. For reference and learning, not diagnosis or treatment advice.
Made for the questions you look up on the ward, at your desk and the night before an exam.
Each claim carries its number where it is made, not in a list at the end. Hover over the number or tap it to see the source behind it.
If Osler cannot trace a passage back to a named guideline, it leaves the passage out rather than cite a bare file number.
One question searches Osler’s own library of 384 international guidelines and up to 9 live sources in parallel. If one source is slow or unavailable, the others carry on.
Name two or more medicines and Osler runs an interaction check. A severe interaction is stated at the very top of the answer, before anything else.
How the interaction check worksClaude Haiku answers fast on every plan. On Pro and Max you can switch to Claude Sonnet for deeper reasoning on complex questions.
Osler plans and pricesEvery conversation is kept until you delete it. Search your questions and answers to find one again, even weeks later.
One click turns an answer into a titled note in Suture, with its numbered sources, ready for your own additions.
Choose 3, 5 or 10 questions and Osler turns the answer, with its sources, into a Ward quiz, so you can test yourself later.
Osler’s own library of 384 international guidelines from 25 countries (58,796 searchable passages, from societies such as the European Respiratory Society, IDSA, ASCO, AHA and ACC), plus live PubMed, Europe PMC, Cochrane, ClinicalTrials.gov, DailyMed, OpenFDA, EMA, WHO ICD-11 and an interaction check, in a fixed order of evidence.
Browse the clinical guideline libraryThe order of evidence Osler follows
An answer is where learning starts. Keep it, test yourself on it or share it, without copying and pasting.
Save an Osler answer to Suture in one click. It becomes a titled note with its numbered sources, which you can edit, link and study from.
Notes in SutureTurn an answer into a Ward quiz of 3, 5 or 10 questions, with its sources, and test yourself on it later.
Quizzes in WardIn a Prognia conversation, ask Osler and it posts an answer with its sources into the chat, for everyone in it.
Your Prognia chatsStudents, doctors, nurses and pharmacists use the same Osler. What differs is the question.
Understand the evidence behind what you learn, with the source attached.
A question you might ask
How do SGLT2 inhibitors work in heart failure?
Check a guideline point between patients, then read the source when there is time.
A question you might ask
Which scores help rule out a pulmonary embolism?
See what a guideline recommends and where it says so, before you pass it on.
A question you might ask
What does GINA say about as-needed ICS-formoterol?
Explain a medicine or a condition clearly, with a source you can show.
A question you might ask
What are the common side effects of metformin?
Look up product information and trial data side by side, each with its source.
A question you might ask
What does the product information say about simvastatin with clarithromycin?
Prepare teaching with sources your students can open, then turn it into a quiz.
A question you might ask
Summarise the evidence on lenient rate control in AF.
Osler is made by Prognia B.V. in Amsterdam, the Netherlands.
Osler can make mistakes. Check the sources before you rely on an answer. Osler does not diagnose or give treatment advice, and you should never enter information that could identify a patient.
384 international guidelines from 25 countries, split into 58,796 searchable guideline passages. Up to 9 live sources per question. One app in 5 languages.
Source: the Osler guideline library and code, September 2026.
Osler is Prognia’s medical AI for doctors and students: ask a clinical question and get an answer in which every claim is numbered to its source (384 international guidelines and 9 live sources including PubMed, Cochrane and ClinicalTrials.gov), as a reference and learning tool, not a diagnosis.
From Osler’s own library of 384 guidelines from 25 countries and up to 9 live sources per question: PubMed, Europe PMC, Cochrane, ClinicalTrials.gov, DailyMed, OpenFDA, EMA, WHO ICD-11 and an interaction check. Every claim is numbered to the source it came from.
Osler never cites a source it cannot name and link, and every claim carries a number you can open. AI can still make mistakes, so check the source before you rely on an answer.
Osler is a reference and learning tool. It does not diagnose or give treatment advice; you remain the doctor.
No. Ask general clinical questions and never enter anything that could identify a patient.
No. Students, nurses, pharmacists and doctors can all create a free account; there is no NPI or licence check.
384 guidelines from 25 countries, from societies such as the European Respiratory Society, IDSA, ASCO, AHA and ACC. It does not replace your local or national guidance, so check that too.
Yes: 3 questions a day with fast answers on the free plan. Pro gives 15 a day and Max 35, both with the choice of a deeper model.
Yes. One click saves an answer as a note in Suture, or turns it into a Ward quiz of 3, 5 or 10 questions.
Free: 3 questions a day with fast answers. Pro: 15 a day and Max: 35 a day, both with the choice of the deeper model.
Prognia: your network, spaces, messages, calls and calendar. Free, always.
Fifteen questions a day and the deeper model
More study sessions a day, practice exams and progress insights
Unlimited notebooks, linked sources and the full atlas
Taxes are calculated at checkout. Change or cancel any app whenever you like.
Compare every featureWe care for the people who care.
Free. No ads. Your data stored in the EU.
