zerospike: Blood Sugar Diary

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In-app purchases

About this app

Log a blood sugar reading in seconds and keep glucose, meals, insulin and medication in one private diary. No account, no cloud; every record stays on your phone.
For anyone living with type 1, type 2 or gestational diabetes, keeping an eye on prediabetes, or tracking without a diagnosis. If you have ever written a number on the back of a receipt, this is the notebook you meant to keep.

AN ENTRY IN SECONDS
- Glucose in mg/dL or mmol/L, tagged fasting, pre-meal, post-meal (2h) or bedtime. Open, type, done.
- The insulin you took: your own basal and bolus products; premixed gets its own row. The app never calculates or suggests a dose.
- Pills in one tap, and a daily reminder if you like.
- 1000+ foods with carb counts: scan the barcode, pick a favorite, or add your own and give it an emoji.
- Tap "I started eating" and a 120-minute countdown sits on the dashboard. Started late? It counts what is left.

REVIEW YOUR HISTORY
- A color-coded journal with a daily chart. Edit an entry or swipe to delete; undo waits 5 seconds.
- Insights (Pro): the share of readings inside your target range (time in range), a typical day built from every reading in the period (AGP), an estimate of A1C from your average (GMI), 30 and 90-day trends, a weekly digest.
- Meal response (Pro): the 3-hour curve after a meal, alongside earlier logs of the same food.
- A doctor-ready PDF for any date range, made on the phone, Insights included.

INJECTION SITE ROTATION
- A body map of your logged injections, mirrored so your left is on the left. It marks the spot that has waited the longest, with a short note on how quickly each region typically absorbs.

TRACKING WITHOUT A DIAGNOSIS
- Choose "No diagnosis" at setup and the insulin screens stay hidden. You keep a plain journal of glucose and meals.
- Reference pages from the ADA and CDC are linked inside the app. The app scores nothing; that conversation belongs with your doctor.

STAY ON SCHEDULE
- Up to 10 reminders in one place: glucose, medication, basal, or any you write yourself. Medication can repeat through the day. Pick a ready-made set at setup and see the next 24 hours on one screen.
- Turn on "Play as alarm" and a reminder you set rings full-screen, audible on silent, and survives a restart; one tap turns it back into a notification.
- A persistent, silent notification keeps the post-meal countdown in view.
- Six home screen widgets: last reading and next reminder at a glance, log glucose or a meal in one tap, start the timer, and more.
- Wear OS companion: your last reading, colored by your target band, and the time of your next reminder, in the watch app and on a tile; a complication shows the reading too.

MORE
- Profiles for yourself and the people you care for; each keeps its own log and reminders.
- Health Connect (Pro) imports the last 30 days of glucose readings. Write-back of hand-entered readings is optional; delete a reading and its Health Connect copy goes too. Glucose only.
- 9 languages, with full right-to-left layout for Arabic.

Download zerospike, make your first entry in seconds, and walk into your next appointment with a clear log.

zerospike is a personal tracking logbook. It is not medical advice and not a medical device. Always decide treatment with your healthcare team.

Pro plans: monthly, yearly (7-day free trial) or a one-time lifetime purchase.

Privacy Policy: https://greeneyeapp.com/en/legal/zerospike-privacy
Terms of Use (EULA): https://greeneyeapp.com/en/legal/zerospike-terms

What’s new

• Injection log is simpler: your insulin product is set once in Settings, not on every entry.
• Health sync is more reliable: readings that could not be written are retried, and Settings shows the last write.