The best symptom checker depends on what you want to happen after the questions. Some are AI chats that help narrow down what's going on, some are public health services that tell you where to get care, and some lead to a doctor online. None replaces a doctor, and in an emergency, call your local emergency number.
Type 'symptom checker' into a search bar and you'll get tools that look alike on the surface: a box, a few questions, a result. Behind that, though, they're built for different endings. One hands you on to a public health service, another to a doctor online, another to a plan.
This list covers ten symptom checkers, using only what each maker's own site says, read on 2 Nov 2026 (as of Nov 2026). It's alphabetical and in no particular order. It doesn't weigh up accuracy or make claims about diagnosis: it's about what each tool does and where it sends you next.
Symptom checkers compared by type
| Tool | Type | Good for |
|---|---|---|
| Ada | AI symptom checker app | A symptom checker available 24/7 |
| Buoy Health | AI symptom chat | Chatting about symptoms to find the right care |
| Counsel Health | Medical AI chat with doctors | Quick health questions answered by AI and a doctor |
| Doctronic | AI doctor chat | Describing symptoms, with a licensed doctor online |
| Isabel Healthcare | Differential diagnosis and self-triage tools | A clinician tool with a self-triage option beside it |
| Mediktor | AI healthcare assistant platform | A symptom checker from a healthcare AI platform |
| NHS 111 online | Public health service for England | Knowing where to go for symptoms in England |
| Sharecare AskMD | Health question tool | Turning a health question into a plan |
| Symptoma | Digital health assistant and symptom checker | A symptom conversation you can restart |
| Symptomate | Online symptom checker | A web check plus iOS and Android apps |
Ten online symptom checkers
Ada
Best for: Checking symptoms in an app at any hour, with a medical library on the same site, which is in English, German, Spanish, Swahili, Portuguese and Romanian.
Buoy Health
Best for: A chat-style check where the AI asks questions and helps narrow down what's going on, with finding the right care as the stated aim.
Counsel Health
Best for: Quick health questions when you'd like a doctor in the loop: you chat with medical AI and a doctor online.
Doctronic
Best for: Describing your symptoms to what it calls your personal AI doctor, with the option to see a licensed doctor online.
Isabel Healthcare
Best for: Readers who'd like the clinician's tool: a differential diagnosis tool, with Isabel Self-Triage and a clinical educator tool listed beside it.
Mediktor
Best for: Trying a check your symptoms option on a platform its page says was created by doctors, which also serves healthcare providers and telemedicine.
NHS 111 online
Best for: People in England who want to know where to go: 111 online can tell you what to do next for symptoms, dental, mental health and sexual health.
Sharecare AskMD
Best for: Starting with a health question and ending with a plan, which AskMD builds from your history and records.
Symptoma
Best for: Working through symptoms as a conversation with a digital health assistant, which you can clear and restart at any time.
Symptomate
Best for: Online checks or the iOS and Android apps, built on a symptom checker and digital triage platform, with the site in languages from Czech to Arabic.
What happens after the questions?
The useful first question isn't which checker to trust. It's what you want to happen next. Buoy says its AI 'asks questions and helps narrow down what is going on'. NHS 111 online 'can tell you what to do next'. Doctronic asks you to describe your symptoms and offers a licensed doctor online, and Sharecare's AskMD starts with a question and ends with a plan.
- AI chat: you answer questions and the tool helps narrow down what might be going on.
- Public health service: you answer questions and it tells you what to do next and where to go.
- Front door to a doctor: you describe your symptoms and can move on to a doctor online.
AI chats that narrow things down
Several tools here are built as a conversation. One says its AI asks questions and narrows things down based on your answers, with the stated aim of helping you find the right care. Another is a digital health assistant you can clear and restart at any time. Ada says its app is connected to a core system 'which combines medical knowledge with intelligent technology', and it sits beside a medical library.
Two more come from companies that also work with healthcare businesses. Symptomate says it's based on a symptom checker and digital triage platform, and it offers iOS and Android apps. Mediktor offers a check your symptoms option on a platform its page says was created by doctors, with pages for healthcare providers, telemedicine and public health.
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A public service that points you to care
The public option on this list is the NHS's 111 online service, and it's for England only. It starts by asking what you need, with choices for help with symptoms or an injury, dental help, mental health help, sexual health help, and a prescription or medicines information.
The same page points to the NHS App, where you can request GP appointments, manage hospital referrals and order repeat prescriptions. So if you're in England and you're not sure whether you need a GP, a pharmacy or something else, this is the tool built for that question.
Checkers that lead to a doctor
A few tools are a front door to a clinician. One invites you to describe your symptoms to what it calls your personal AI doctor, and offers a licensed doctor online if you need a prescription or a doctor's note. Counsel Health lets you chat with medical AI and a doctor online, for anything from quick questions and prescriptions to lab results.
AskMD takes a slightly different route. You start with your question, and its page says it reads your history and records, then gives you a plan you can act on. And Isabel Healthcare is the odd one out: it's built around a differential diagnosis tool, with a self-triage tool and a clinical educator tool listed beside it.
Questions to ask yourself before you start
- Do I want a sense of what's going on, or to know where to go next?
- Am I in England, where 111 online is an option?
- Would I like the option to talk to a doctor online afterwards?
- Do I want to use a website, or an app on my phone?
- Which language do I want to answer the questions in?
- Do I need a prescription or a doctor's note, or just a next step?
Do you make a symptom checker? Tool makers can ask to be considered for a featured place on this list.
My advice on using a symptom checker
Pick the tool by the ending you want. If you'd like help narrowing down what's going on, start with one of the AI chats. If you're in England and want to know where to go, 111 online is built for that. And if you think you'll need a prescription or a doctor's note, choose a tool that leads to a doctor online. Whatever the result, if you're worried, speak to a doctor.
If you're looking after your health at home in other ways, see my list of the best medical alert systems and the best menopause apps for tracking symptoms.
Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.
Frequently asked questions
Can I use 111 online outside England?
The 111 online service on this list is for England. Its page also points to the NHS App, where you can request GP appointments, manage hospital referrals and order repeat prescriptions.
Which of these symptom checkers have an app?
One checker offers iOS and Android apps, one says its symptom checker is available through its app 24/7, and the NHS service links to the NHS App for GP appointments, referrals and repeat prescriptions.
Which of these let me talk to a doctor?
Two do on their own pages. One offers a licensed doctor online after you describe your symptoms, and one lets you chat with medical AI and a doctor online, from quick questions and prescriptions to lab results.
Do these symptom checkers work in other languages?
Some do. One site is in English, German, Spanish, Swahili, Portuguese and Romanian, one lists languages from Czech and Polish to Arabic and Chinese, and Symptoma shows a language menu on its page.
Is there a symptom checker built for doctors?
One tool on this list is built around a differential diagnosis tool, with a clinical educator tool and a self-triage tool listed beside it. Read which version you're opening before you start.
How does Buoy Health's chat work?
Its page says the AI asks questions and helps narrow down what is going on based on your answers. The stated aim is to help people work out health issues and find the right care.
