A personal logbook for people taking warfarin
Your warfarin and INR record, kept in one place.
INR Tracker records the INR results, warfarin doses, vitamin K, activity and health events you enter, with testing reminders and a report for your clinic. Everything you enter, nothing else.
Free to downloadiPhone · iOS 15 or later · No account
- No accountNothing to sign up for. Open the app and start your record.
- Kept on your iPhoneYour records sit in an encrypted database on your device. We don't receive a copy.
- No advertising, no trackingThe app contains no analytics and no advertising tools.
01Record
Seven kinds of entry, each with its date
Record what you want to keep. The diary lists every entry day by day, and filters by type. Swipe an entry to the left to delete it, or to the right to edit it. Every kind can be edited except vitamin K.
Take or pick a photo to attach to an INR result, a dose schedule or a health event: a meter display or a clinic dose letter, for example.
- INR results
- Each test result, with the date. Type it in, or scan your meter's display and check the figure before you save it.
- Warfarin doses
- Your dose schedule as a weekday pattern, and which doses you actually took.
- Vitamin K
- From a food reference list, or as a precise figure you enter yourself. Vitamin K foods, in Settings, lists the app's 105 foods to browse, with the vitamin K1 figures USDA FoodData Central holds for each, per portion and per 100 g.
- Activity
- Type, duration and intensity.
- Weight
- Your body weight, one figure per day, shown in kg, in stones and pounds or in pounds.
- Alcohol
- Your alcohol units, one figure per day.
- Health events
- A new or stopped medication, an illness, or a change in weight, as a dated entry.
The diary, filtered to the last 90 days.
02Doses
A week of doses, entered as a pattern
Your dose schedule is a pattern for the seven days of the week, in milligrams. The weekly total is worked out from the days you enter, and is never typed in separately.
Each day, record the dose as taken, as a different amount, or as skipped. When your clinic changes your dose, enter the new pattern and the date it takes effect.
The app never proposes, calculates or checks a dose. Your clinic decides your dose.
A dose schedule, with its weekly total.
03Reminders
Reminders on the schedule you set
Set your own schedule for dose reminders, test reminders and clinic-report reminders. They are scheduled on your iPhone and don't come from a server.
A dose reminder reads “Today's dose is due.” It shows your dose amount only if you switch that on in Settings.
Notifications can fail: a flat battery, a system update or a changed permission can all stop them. Don't rely on the app alone to remember a test or a dose.
- INR TrackerWarfarin doseToday's dose is due.
- INR TrackerINR test todayYour usual test day
- INR TrackerClinic report due todayRecord your INR and report it
04Widgets and Siri
Today's dose without opening the app
A home-screen widget shows whether today's dose is due or recorded, your next test day and the days until your next clinic report. It shows the dose amount only if you switch that on in Settings.
- Home-screen widget. In a small or a medium size. The medium one adds a Taken button while today's dose is due, which records nothing until you confirm it in the app, and a Record INR button, which opens INR entry.
- Lock-screen widgets. On iOS 16 or later, in three shapes. They show your next test day or clinic report, and the rectangular one also whether today's dose is due or recorded. None shows the amount.
- Siri. On iOS 16 or later, say “I took my warfarin in INR Tracker” or “Log my INR in INR Tracker”. Neither records anything by itself: the app asks you to confirm the dose, and opens INR entry with the value filled in for you to save. What you say to Siri is handled by Apple.
The widgets and Siri are part of the one-time purchase.
The small and medium widgets on a home screen.
05Apple Health and your meter
Bring in workouts and weight, or scan your meter
Two ways to fill in entries without typing them. Neither adds anything until you confirm it.
- Import from Health. In Settings. It reads Apple Health only while you use that screen: after you tap Continue it reads the days since your last import, or the last 90 if there has been none, shows what it found, and adds nothing until you tap Import. You can then choose other dates. A workout becomes an activity entry and is never imported twice. The app reads no intensity from Apple Health: an imported workout's intensity shows as Not recorded until you choose one. A weight you entered yourself is never replaced. INR Tracker writes nothing to Apple Health.
- Scan your meter. On the INR entry screen, Scan meter takes a photo of your meter's display. Apple's text recognition reads it on your iPhone, and the app shows the figure it found and asks whether it is the reading on your meter. It reads the figure and not the unit, so check it against your meter. Nothing is saved until you tap Save, and the photo is not kept. Where it can't offer one figure as the reading, two figures at the same size for example, it says so and you type the reading instead.
Import from Health and scanning your meter are part of the one-time purchase.
06Charts
Charts that show what you entered
See your recorded readings, doses, vitamin K and activity laid out on shared timelines you can read side by side. A row at the top of Trends sets one time range for every chart but consistency: 3 months, 6 months, 1 year or All. Consistency always shows the last 12 completed weeks. Every chart is also a table.
You see exactly what you entered — nothing is scored, labelled or rated.
Two more charts put the weight and alcohol units you record on a timeline with your INR readings. These two and the charts of your INR with weekly dose, vitamin K and activity share one card, with a chip for each to choose which one it shows.
Customise Trends, in Settings, reorders the charts and switches off the ones you don't use; the shared card's chips follow the order set there. The INR timeline always stays.
INR over time, with the target range you set, INR with weekly dose, and INR with weight.
07Clinic
Your record, ready for your clinic
Set the dates your clinic expects a report, and the app reminds you as each one comes up. Email a reading to your clinic from your own email app, or generate a printable PDF of your recorded data to bring or send.
- Since your last report. A summary of what you have recorded since your last clinic report: readings, dose changes, doses not taken, vitamin K, activity and health events.
- Email options. Choose the period the detailed clinic email covers (this result only, since your last report, the last 3 months or dates you choose) and which of its sections it includes.
- Report sections. Choose which sections go into the clinic report.
- Dose calendar and annual logbook. Print a month of planned doses from the schedule you entered, and a year of your records, month by month.
Reports show only what you entered. They are not clinical documents.
A clinic report, with the reading linked to it. The clinic shown is fictional.
08Your data
Your records stay on your device
Everything you record, photos and imported workouts and weight included, is kept encrypted on your iPhone. We can't see it, and we don't receive a copy.
- No account. There is no sign-up and no sign-in.
- No analytics, advertising or tracking. The app contains none.
- Backups you control. Save a backup file whenever you like, with a passphrase if you choose one. A backup saved without a passphrase is not encrypted. Automatic backups to your own iCloud Drive are there if you turn them on, and you choose then whether they have a passphrase.
- Photos stay on your iPhone too. Each photo you attach is saved without its location and other hidden details, and stored encrypted. The app never sends a photo anywhere: photos leave your device only in a backup you make or turn on, or, still encrypted, in your phone's own device backup.
- Apple Health and the camera. The app reads Apple Health only while you use Import from Health and never writes anything to it. Imported workouts and weight are kept like the rest of your records: the app never sends them to us or anyone else, and they leave your device only in a backup, export or report you make or turn on, or, still encrypted, in your phone's own device backup. When you scan your meter, the photo is read on your iPhone by Apple's built-in text recognition and is not kept.
- One check over the internet. Apart from automatic backups you turn on, the only thing the app sends by itself is a check with our payment provider, RevenueCat, to confirm whether you've made the one-time purchase. That check never includes anything you've recorded.
We don't hold a copy of your records, so we can't recover them if they are lost. Making backups is up to you.
Backup and export, in Settings.
09Limits
What INR Tracker does not do
INR Tracker records what you enter. Decisions about your dose and your care are your clinic's, not the app's. INR Tracker is not a substitute for professional medical care and is not a medical device.
What it does
- Records the entries you make
- Reminds you on the schedule you set
- Shows your entries back to you as lists, charts and reports
- Lists 105 foods with the vitamin K1 figures USDA FoodData Central holds for each
- Works out totals, averages and percentages, such as a weekly dose total, from your entries, and a food's vitamin K per portion from its figure per 100 g
What it does not do
- Calculate a warfarin dose, or tell you what dose to take
- Interpret your results
- Predict future results
- Detect a problem, or check for drug interactions
- Replace your anticoagulation clinic, your doctor or your pharmacist
10Pricing
Free to download. One optional purchase.
Recording, reminders and backup are free. A one-time purchase unlocks the further charts, clinic documents, attaching photos, the widgets, Siri, importing from Apple Health and scanning your meter for as long as you use the app. There is no subscription.
Free
£0to download and to record
- Recording INR results, doses, vitamin K, activity, weight, alcohol and health events
- Dose, test and clinic-report reminders
- The Vitamin K foods list
- The INR timeline chart
- Emailing a reading to your clinic
- Full backup and restore, and CSV and JSON export
- Viewing and deleting photos you've already attached
One-time purchase
£4.99in the UK, paid once
- Five further charts: weekly dose, vitamin K and activity on shared timelines with your INR, plus consistency and an INR range summary
- Two charts that put your recorded weight and alcohol units on a timeline with your INR
- A “since your last report” summary, and a detailed clinic email whose period and sections you choose
- Clinic PDF reports, with the sections you choose
- A printable dose calendar
- An annual logbook
- Attaching photos to INR results, dose schedules and health events
- The home-screen and lock-screen widgets
- Siri requests to log today's dose or an INR reading
- Importing workouts and weight from Apple Health
- Scanning your meter's display to fill in an INR reading
The price in your country is shown in the App Store before you buy. Apple takes the payment. To ask for a refund, contact Apple.
11Questions
Questions people ask
Is INR Tracker a medical device?
No. INR Tracker is a personal record. It does not calculate a dose, interpret a result, predict an outcome or check for drug interactions, and it is not a substitute for professional medical care.
Do I need an account?
No. There is no account and no sign-up.
Where are my records kept?
In an encrypted database on your iPhone. We can't see them and we don't receive a copy. They leave your device only in a backup or export you make or turn on, a report or email you send, or, still encrypted, in your phone's own device backup. The privacy policy sets this out in full.
What happens if I lose or replace my iPhone?
Your records are on your device and in the backups you make. Save a backup file from the app, or turn on automatic backups to iCloud Drive, then import the backup on the new phone.
Your phone's own device backup may include the app's database, but the key that opens it can't be moved to another device, so make a backup from inside the app. If you lose the passphrase for a backup, that backup can't be opened. We don't hold a copy, so we can't recover your records.
Can I get my records out of the app?
Yes. A backup file holds everything recorded in the app, and your entries also export as CSV or JSON. A backup file is encrypted only if you give it a passphrase; without one, anyone who has the file can read it. CSV and JSON exports are never encrypted, and go wherever you send them.
Is there a subscription?
No. The app is free to download, and the one purchase is paid once.
Which devices does it run on?
iPhone, with iOS 15 or later.
Where is it available?
On the App Store in the United Kingdom, the United States, Canada, Australia and most other countries. It is not available in the countries of the European Union.
Who is it for?
Adults aged 18 or over who take warfarin and keep their own record, or who help someone they care for keep theirs, with that person's permission.
12Support
Help and contact
Email us about the app and we'll reply by email. In the app, Contact support is in Settings, under Help & support.
We can't answer questions about your dose, your results or your care; those are for your clinic. Please include only the health details needed to answer your question.
Start your record
Free to download for iPhone. No account.