Comparison

Glucose Timer vs Blood Sugar Diary

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Glucose Timer

Features
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Forget to check your blood sugar two hours after meals? Find other tracking apps too complicated? "Glucose Timer" is designed for individuals seeking efficiency and simplicity in managing their blood sugar. We've removed all unnecessary complexities, making blood sugar tracking effortless. Core Features: Ultimate Simplicity 1. One-Tap Meal Start:Tap the large "Start Meal" button, and the timer begins instantly. 2. Smart Meal Type Detection: No need to manually select breakfast, lunch, or dinner; the app automatically categorizes your meal based on the current time. 3. Timely Reminders: Automatically receive push notifications two hours (customizable) after your meal, with support for long-pressing the notification to record directly, without even opening the app. 4. Home Screen Widget: See the countdown directly on your home screen, always keeping track of the remaining time. Visual Health Management 1. Traffic Light Calendar: Instantly identify days with high or on-target blood sugar readings through intuitive red, green, and gray indicators. 2. Comprehensive History: Tap on any date in the calendar to view detailed meal and glucose records for easy discussion with your doctor. Simplify your glucose management. Download "Glucose Timer" now and cultivate healthy monitoring habits!

About

Blood Sugar Diary

Features
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Log your blood sugar, meals and insulin in seconds and see your day at a glance. Your diary stays on your phone and needs no account; Spike sends only what you choose. For type 1, type 2, gestational diabetes, prediabetes, or no type at all. Carb counting is free on every plan. YOUR DAY AT A GLANCE - Blood sugar in mg/dL or mmol/L, tagged fasting, before a meal, after a meal or bedtime. - Today's average, time in your target range and last reading on one screen, plus a color-coded journal, daily chart, 7-day overview and weekly summary. CARB COUNTING - 1,600+ foods from many cuisines, bagels to burritos: scan a barcode, pick a favorite or use household measures such as slices and cups. - Pick the foods, see the meal's carb total. - Add up to 10 foods of your own (unlimited with Pro). - Type a meal in a few words, like "2 pancakes with syrup", and Spike estimates its carbs. An estimate, not a dose. 1 a day free, 50 with Pro. INSULIN AND MEDICATION - Log the insulin you took with your own basal and bolus products, and your pills, in one tap. - A body map of your logged injection sites shows which you use most; with Pro, the site unused longest. - You always enter the dose you took yourself; no dose is logged automatically. SPIKE, THE IN-APP ASSISTANT - Describe your day in plain words and Spike prepares a log draft; nothing is saved until you confirm. - Ask about the app or about diabetes in general: 3 messages a day free, 50 with Pro. - If you allow it, Spike answers questions about your logbook with aggregate, descriptive replies. Not medical advice. REMINDERS, POST-MEAL TIMER, WIDGETS - Up to 10 reminders for blood sugar, medication, basal or your own text. With the latest iOS, a reminder can ring out loud, even on silent. - One tap on "I started eating" starts a 2-hour post-meal countdown, shown as a Live Activity on your lock screen. - Home and lock screen widgets, Control Center buttons and an Apple Watch app with your last reading. APPLE HEALTH - If your sensor app shares glucose with Apple Health, zerospike brings in the last 24 hours while open, CGM values included. - Your own entries can be written to Apple Health, only with your permission. PRO - Reports (Pro): weekly and monthly summaries of your entries, with time in range and average glucose. - Nutrient balance (Pro): fat, protein, fiber, sugar and more from the meals you log, where the catalog has the data. - 14-day ratio observation (Pro): a descriptive summary of the carbs and mealtime insulin you logged over 14 days. Information, not a dose. - Spike report review (Pro): Spike describes a report in plain words, only after a separate consent. Not medical advice. - PDF summary (Pro) for any date range, made on your phone and ready to share. - Automatic sync (Pro): glucose from Apple Health in the background when allowed, up to 90 days back; Nightscout if you run your own server. - Family profiles (Pro): a separate diary and reminders for each person you care for. - Also with Pro: 30 and 90-day views, the full sensor curve, unlimited own foods, 50 Spike messages a day. MORE - A backup file you keep, 12 languages, right-to-left layout for Arabic. - No account, no sign-up; usage analytics are off by default. SUBSCRIPTION AND FREE TRIAL Pro is a monthly or yearly subscription, or a one-time lifetime purchase. The yearly plan starts with a 7-day free trial for new subscribers: cancel at least 24 hours before the trial ends to avoid the charge. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends; cancel anytime in your Apple Account settings. zerospike is a personal tracking logbook. It is not medical advice and not a medical device. Decisions about your care stay with your healthcare team. Privacy Policy: https://greeneyeapp.com/en/legal/zerospike-privacy Terms of Use (EULA): https://greeneyeapp.com/en/legal/zerospike-terms

Screenshots

Glucose Timer4 screens
Blood Sugar Diary4 screens

Verdict

The call

The clearest difference is in-app purchases: Glucose Timer at none against Blood Sugar Diary's 4. Blood Sugar Diary's advantage is update cadence (every 4 days vs every 2 weeks) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Blood Sugar Diary sells 4 in-app purchases, starting at $7.99 per month. Glucose Timer asks for nothing beyond the download.

UpkeepUpdate frequency

Glucose Timer ships an update every 2 weeks, Blood Sugar Diary every 4 days. The most recent releases landed on November 9, 2026 and November 11, 2026 respectively.

Scorecard3 real differences ยท 3 level
Glucose Timer versus Blood Sugar Diary: the parameters behind the verdict, then further details
ParameterGlucose TimerBlood Sugar Diary
PriceFreeFree
Update frequencyEvery 2 weeksEvery 4 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhoneiPhone, iPad, Apple Watch โ€” better
Requires iOS17.016.4 โ€” better
Further details โ€” not scored
Size6 MB74 MB
Age rating4+12+
DeveloperWeichen ChengMuhammed Bozkurt

In-app purchases

None

Glucose Timer

No in-app purchases

4 purchases

Blood Sugar Diary

Subscriptions3
  • zerospike Pro Monthly$7.991 Month
  • zerospike Pro Annual7 Days trial$39.991 Year
  • zerospike Pro Annual1 Year trial$39.991 Year
One-time1
  • zerospike Pro Lifetime$99.99

Questions

Is Glucose Timer free?
Glucose Timer is free to download, with no in-app purchases.
Is Blood Sugar Diary free?
Blood Sugar Diary is free to download, with in-app purchases available.
Do Glucose Timer or Blood Sugar Diary have ads?
Neither Glucose Timer nor Blood Sugar Diary shows ads.
Which is updated more often, Glucose Timer or Blood Sugar Diary?
Glucose Timer ships an update every 2 weeks, and Blood Sugar Diary every 4 days. Most recently, Glucose Timer was updated on November 9, 2026 and Blood Sugar Diary on November 11, 2026.

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