We walk with you
Not a one-off check. SIS stays with you from the first strange symptom to the appointment where someone finally listens, and every step in between.
Seen. Informed. Supported.
Your ten minutes. Make them count.
Never lose your words when they matter most. If you've been told it's hormones, your weight, your age or stress, and your body says otherwise… SIS helps you walk into a short appointment ready. Your words first, your symptoms clear, your questions written down. Then afterwards, what was said and what happens next.
- Free on iPhone and Android
- No account, no sign-in
- Your record stays on your phone
- Always in your pocket, always on hand
SIS is not a medical device and never diagnoses. It helps you keep and share your own story.
Free & privateYour health, calmly in hand.
- Private by designStays on your phone
- Patterns over monthsNot just today
- Doctor summaryReady in minutes
- Built from lived experienceBy a woman who was there
This isn't just a website. This is SIS.
You're never alone with SIS.
We're here for you when you need us. Always in your pocket, always on hand, walking with you through every step of your journey.
We believe you
Built by a woman who spent seven years not being believed. SIS never dismisses you, never rushes you, and never tells you it's all in your head.
We help you be heard
Your words, typos and all, turned into one clear summary a doctor can read in minutes. So you're heard the first time, not the fifth.
We keep it yours
No account, no sign-in, nothing sent unless you choose. Your story stays in your pocket, where it belongs.
How it works
Three things. That's it.
Everything else lives quietly in your rooms, there when you need it.
Get ready to be seen
A few questions, about five minutes. What's been happening, when it started, what you most need them to know, and what you want to ask. One clear summary, with your words first.
After my appointment
What was said, what happens next, and whether your questions got answered. So nothing slips through the gap before the next one.
Jot it down
Whatever's happening, while it's fresh. Type it or say it, typos and all. Tap how bad it is, 1 to 10, if you like.
How to use every feature, step by step
For women living with endometriosis, PCOS, adenomyosis, perimenopause or menopause, fibromyalgia, thyroid problems, long COVID, chronic pain, or something no one has put a name to yet.
You shouldn't have to feel well to use a health app.
Or say it right to be heard.
So SIS takes your words, typos and all. And with Premium, one tap when it starts and one tap when it stops, for the days you're too rough for anything else.
What's free in SIS?
Almost everything.
- Get ready to be seenThe whole walk-through, about five minutes
- Your summary for the doctorOn screen, as a PDF, or copied
- After my appointmentWhat was said, what happens next
- Jot it downTyped or spoken, with how bad it is
- My story, in your own wordsNo forms, any order
- Symptoms, tapped or typed150+ to choose from, with when each started
- Appointments & tests, medications, letters & documents
- Patterns SIS notices for you
- Safety warningsWhen something shouldn't wait
- Find support
The things that keep you safe and get you heard will never sit behind a paywall.
- Big Sis: help me work out what to askShe starts from what you've already written
- Big Sis: explain a word or phraseFrom your letters or records, in plain English
- Big Sis: understand my last appointment
- Time itOne tap when it starts, one tap when it stops
- Follow-up reportOnly what's changed since last time
- Sort my storyYour own words, sorted into your record
- Pull details from a letterPaste a letter, SIS picks out the key details
Premium comes with a 7-day free trial. Prices are shown in your app store.
Meet Big Sis
For when you'd like a hand.
Big Sis is an optional companion inside SIS. She can help you work out what to ask, explain a word or a letter in plain English, and make sense of your last appointment. Premium also adds Episodes and readings, Follow-up, and two helpers that sort your story and your letters into your record, right on your phone.
She starts from your own words, so you never have to say it twice.
She never diagnoses. And before anything leaves your phone, she shows you exactly what would be shared. You decide, every time.
- Work out what to ask
- Explain a word or phrase
- Understand my last appointment
- Track what matters to you
Private by design
Yours, and only yours.
Your health story is one of the most personal things you own. So SIS keeps it on your phone, and nowhere else.
- No account, no sign-inSIS doesn't know who you are, and doesn't need to.
- Nothing sent without youYour record stays on your device. We never see it.
- The one exception is your choiceIf you ask Big Sis, you see exactly what goes first, and you can change it. Things like phone numbers and NHS numbers are taken out, and SIS keeps none of it.
The name
Seen. Informed. Supported.
Sisters in Solidarity.
And quietly, it stands for sister: the one who believes you, the one who's been there too.
Why SIS exists
Built from seven years of not being heard.
"I lived with symptoms for seven years after an Essure implant. Waiting lists, wrong departments, told nothing was wrong. I got my life back. A lot of women don't."
When Tamalyn shared her story, she heard the same thing from women with autoimmune conditions, cluster headaches, strokes, lymphoedema and missed cancers: not having a say, and not being in control, when they knew something was wrong.
For the record, these were her symptoms:
- Severe bloating
- Headaches, neck and jaw pain
- Joint pain
- Shooting leg pains
- Swelling
- Stabbing abdominal pain
- Pelvic ache
- Dizzy episodes
- Forgetfulness
- Fatigue
SIS exists so the next woman doesn't have to start from zero. Because the burden of being believed should not fall on the person who is unwell.
Tamalyn MilliganFounder of SIS
Stories
You are not the only one.
Founder's story
My Essure story: why I built SIS
Seven years of symptoms, long waiting lists, and the day a radiologist could only find one implant.
VoicesThe SIS blog
Real stories, a health spotlight each month, and what's out there to help.
Coming soonWhat we heard
What women tell SIS about their journeys through healthcare, shared anonymously and by choice, published once enough people have answered.
Have a story you'd like to share? hello@bigsis.health
Questions
The things people ask first.
Does SIS give medical advice?
No. SIS is not a medical device and does not diagnose, treat, cure or prevent any medical condition. It doesn't suggest diagnoses and it doesn't replace your doctor. It helps you keep, understand and share your own record. If something is new, severe or getting worse, speak to a doctor, and in an emergency contact your local emergency services.
Where is my data stored?
On your phone. There's no account and SIS does not share your record. The one optional exception is Big Sis: only the details you approve are sent, after things like phone numbers and NHS numbers are taken out, and SIS keeps none of it. The privacy policy sets out the detail.
How much does it cost?
SIS is free to download and use, and the things that keep you safe and get you heard are never behind a paywall. Premium adds Big Sis and some extra tools, with a 7-day free trial.
I'm already using SIS. Will I lose anything?
No. Everything you've recorded is still there. The app just got simpler to find your way around.
How is this different from the NHS App?
The NHS App shows you the system's record of you. SIS holds your own account: what it feels like, when it started, what you were told and what still hasn't been answered. They work alongside each other.
Does it work outside the UK?
Yes. SIS is on the App Store and Google Play, and its safety messages point you to your local emergency number wherever you are.
Is there a version for men?
Yes. BRO is the brother app, built on the same idea: your record belongs to you, it stays on your device, and it should make the ten minutes you get with a doctor count.
Who makes SIS?
SIS was founded by Tamalyn Milligan and is published by TI BARJAC LTD. Get in touch at hello@bigsis.health.
Your story, kept safe, ready when you need it.
Free on iPhone and Android. No account. Nothing leaves your phone unless you choose.