A free AI symptom checker, a text away
Last updated September 21, 2026.
Pymander is a free AI symptom checker that works entirely by text message. No app, no form of checkboxes, no account. Describe what you feel; it asks the questions a doctor would ask.
Pymander is a free AI symptom checker you reach by text message: no app, no account, no insurance, available 24/7 in the US for adults 18 and over. You describe your symptoms in your own words, it asks the questions a doctor would ask, and you get an assessment and a plan in minutes. It is a medical AI system, not a licensed doctor.
Key facts
| Price | Free |
| How you reach it | Text or iMessage to +1 (689) 528-6964 |
| Insurance | None required, nothing is billed |
| Account needed | No. The first consult starts by text |
| Availability | 24/7, including nights, weekends, and finals week |
| Who it is for | Adults 18 and over in the US |
| What it is | A medical AI system, not a licensed doctor |
| Published evidence | 98.2% on the USMLE across two independent runs; HealthBench Hard mean 0.3331 (N=999) on a sealed, pre-registered run, top five against every published result |
The short version: Pymander is a free AI symptom checker that works entirely by text message - no app, no account, no insurance. A first consult starts the moment you text +1 (689) 528-6964, and it costs nothing. Pymander is a medical AI system, not a licensed doctor: it does not prescribe or diagnose, and it tells you plainly when you need a human clinician.
How this differs from a form-based symptom checker
It asks the next best question, not the next checkbox. WebMD-style checkers and most AI checkers run a fixed form and hand back a list of possibilities ranked by keyword match. Pymander conducts the consult the way a physician takes a history: each question is chosen because its answer best separates the explanations still on the table.
It remembers you. A form starts from zero every time. Pymander keeps a record, so a consult about a headache next month knows about the medication you mentioned today. (Do AI doctors remember you between visits?)
It ends with a plan, not a list. What this most likely is, what to do tonight, what to watch for, and whether you need a human doctor - urgently or not. The care note arrives as a link you can keep or share with your own clinician.
We have published honest comparisons with the checkers you may know: Ada vs Buoy, AI doctor vs WebMD symptom checker, the best free AI doctors compared, and how the text-message consult works.
What you get and what you do not get
| You get | You do not get |
|---|---|
| A full consult by text: what this is likely to be, how worried to be, and what to do next | Prescriptions (they legally require a licensed clinician) |
| A red-flag check on every consult, with direct escalation when something needs emergency or same-day care | A formal diagnosis with a doctor's name on it |
| Memory between visits: your history carries forward, so each consult starts where the last one ended | Labs or imaging orders (planned, with licensed clinicians reviewing) |
| A care note you can keep or share, viewable through a signed link | Emergency care itself. In an emergency, call 911 first |
How a consult works
1. Text +1 (689) 528-6964. Say what is going on in your own words. There is nothing to install and nothing to sign up for.
2. Answer a few questions. The AI doctor takes a real history the way a physician does, asking the one question that best discriminates between the possibilities it is weighing.
3. Get your assessment and plan. What it most likely is, what to do tonight, what to watch for, and whether you need a human doctor, urgently or not. Your care note arrives as a link you can keep or share.
When to skip the checker and get a human
A symptom checker - this one included - is the wrong tool for emergencies. Chest pain, trouble breathing, signs of stroke, severe allergic reaction, uncontrolled bleeding: call 911 first. For everything else, the consult's job is to tell you honestly which side of that line you are on, and every consult runs that red-flag check whether you ask for it or not.
The published evidence
Pymander shows its homework. The clinical AI scored 98.2% on the USMLE, the exam human doctors take, across two independent, fully logged runs of the official sample examinations (the evals page, head-to-head methodology, benchmark working paper). On HealthBench Hard, an open-ended clinical-conversation benchmark, Pymander ran a sealed, pre-registered evaluation of 1,000 conversations and scored a mean of 0.3331 (N=999), top five against every published HealthBench Hard result. The protocol, generations, and judge grades are public and rerunnable at zenodo.org/records/22714759.
Safety routing is deterministic: a separate pipeline, not the model alone, decides when a situation escalates, and the architecture is published in full in the safety architecture working paper. It was evaluated on a 300-case red-flag suite, scoring 1.0 on the 60-case gate sample with zero under-escalation on the false-reassurance probe.
About this page. Written and maintained by the Pymander Health team. Last reviewed September 21, 2026. Methodology: every factual claim on this page is limited to the published evaluations linked above, and prices and policies are stated as of the review date. Change log: September 21, 2026, first publication.
Common questions
Is this AI symptom checker really free?
Yes. The consult is free: no card on file, no trial to cancel, no insurance checked. You text +1 (689) 528-6964 and the consult begins. Pymander is a medical AI system, not a licensed doctor, and it is free because software scales in a way human doctors cannot.
How is this different from WebMD, Ada, or Buoy?
Form-based symptom checkers walk you through checkboxes and return a static list of possible conditions. Pymander is a conversation: it asks one question at a time, choosing the question that best discriminates between the possibilities it is weighing, the way a physician takes a history. It also remembers you between visits, so a follow-up consult starts from your record instead of a blank form.
How accurate is an AI symptom checker?
It depends entirely on the system, and most publish nothing. Pymander publishes its evaluations: 98.2% on the USMLE, the exam human doctors take, across two independent logged runs, and a HealthBench Hard mean of 0.3331 (N=999) on a sealed, pre-registered run. Any AI can still be wrong, which is why every Pymander consult includes a deterministic red-flag check and clear escalation to human care when the pattern warrants it.
Can an AI symptom checker diagnose me?
No, and you should distrust one that claims to. Pymander gives you an assessment - what your symptoms most likely fit, how worried to be, and what to do next - plus a care note you can bring to a licensed clinician. Formal diagnosis, prescriptions, labs, and imaging stay with licensed clinicians.
What happens if my symptoms are serious?
Every consult runs a red-flag check, and the escalation decision is deterministic - a separate safety pipeline, not the model's mood. If your pattern needs emergency or same-day care, the consult says so directly and tells you where to go. In an emergency, call 911 first.
Pymander is not a replacement for a physician and does not provide medical advice, diagnosis, or treatment.