Updated ASO teardown, US App Store
RateTracker:Blood Sugar App Store optimization
A Utilities app's App Store page, taken apart: the screenshots and why each one helps people decide to download, the icon and design system, and an ASO score out of 100.
- Est. monthly downloads
- 21K+144.3% vs previous month
- Est. monthly revenue
- $103K−2.4% vs previous month
- Est. revenue ÷ downloads
- $4.90
- Rating
- 4.1★5.6K ratings
Downloads and revenue are third-party est. for the US App Store, latest month vs the month before. Revenue includes renewals, so revenue ÷ downloads is a rough ratio, not what a new user pays. Estimates as of ; rating and dates from the App Store, .
Screenshots and why they convert
9 screenshots of up to 10, the first 6 shown here. The first 3 show in search results when there's no preview video.
#1In search results
Track Heart Anytime Anywhere
- heartnot in name
- What it shows
- An anatomy illustration of a heart and chest with an ECG line, a “Based on PPG technology” laurel badge, and two figures: 87% Stress and 42% Energy. No app screen is shown.
- Why it converts
- Names a technology behind the readings and shows heart-related figures. But the app name says blood sugar and this image shows heart, so the first frame does not match the name. The picture is an illustration, not the app in use.
#2In search results
Detect Heart Rate
- heart ratenot in name
- What it shows
- A hand over a phone's rear camera and flash, in front of a phone screen titled “Measuring” with an ECG trace and a 110/78 BPM reading.
- Why it converts
- Shows how a reading is taken: finger on the camera.
#3In search results
Insight Blood Sugar
- blood sugarin name
- What it shows
- A blood sugar meter screen reading 6.3 mmol/L, with floating cards: a gauge, a monthly calendar and a line chart by day.
- Why it converts
- The first image that matches the name. The word “Insight” is vague, and several cards overlap the phone.
#4
Track Blood Pressure
- blood pressurenot in name
- What it shows
- A blood pressure monitor screen showing 108 SYS and 80 DIA, a finger on the round button, a scatter chart and a monthly status calendar.
- Why it converts
- A clear verb and a feature term in large type. It adds a second reason to install. The cards cover part of the screen.
#5
Monitor Heart Health
- heart healthnot in name
- What it shows
- A heart rate report with colored label pills (Tachycardia, Abundant Energy, Good Stress, Abnormal Blood Pressure) and a blue body figure over the phone.
- Why it converts
- Shows that the app turns numbers into plain labels. “Heart Health” is a broad phrase.
#6
Low GI Health Diets
- low ginot in name
- dietsnot in name
- What it shows
- A recipe card for Atlantic Salmon with Quinoa Herb Crust, with time, GI, salt and sugar values, a “View Recipe & Prep” button and a magnifier on 2.1g sugar.
- Why it converts
- Adds a food and recipe feature that the name does not mention. Real food photos give a different look from the numbers screens. It shows a second use for visitors who want meal ideas.
Icon and design system
What makes the page read as one brand at a glance.
- One idea, a heart with an ECG line, reads as heart rate at a glance.
- The icon includes the letters “BPM”. Text is best kept for when it is essential.
- The icon says heart rate while the app name says blood sugar.
- 01
Two-line captions, blue and navy
Every caption is two short lines in large type. One line is bright blue and the other dark navy, so the key word stands out.
- 02
Feature cards float over the phone
Charts, calendars and gauges sit as cards on top of the phone frame. They make each number big, but the cards often cover the screen beneath.
- 03
A light-blue background on most images
A pale blue gradient with large dark type runs across most images. It feels like one series.
- 04
Many health topics in one set
Captions name heart, heart rate, blood sugar, blood pressure and low GI diets. This casts a wide net, but the lead topic differs from the app name.
- 05
Hands and body illustrations
A finger on the camera, a finger on a button and a body figure show how to use the app or what it covers.
ASO score breakdown
69 of 100 points. The full rule is under “How the ASO score works” below.
- App name18 / 25
- Uses 23 of 30 characters7.7/10
- Brand + keyword phrase10/10
- Keywords fill half the name or more0/5
- Screenshots30 / 35
- Caption on every screenshot5/5
- Each caption names a feature people search for10/10
- First screenshot shows the main use0/5
- One consistent design system5/5
- Readable at search-result size5/5
- Trust signal5/5
- Ratings6 / 25
- 4.1 average (full marks at 4.8)1.9/15
- 5,624 ratings (full marks at 100,000)3.8/10
- Freshness15 / 15
- Last update 21 days ago (full marks within 30)15/15
Where the points are
- Ask happy users for a rating+19 pts
4.1 stars from 5,624 ratings. Apple's in-app rating prompt can be shown up to 3 times a year; show it right after a user finishes something in the app.
- Use the rest of the app name+7 pts
7 characters are free. Add the next most important search term.
- Check caption terms against your subtitle and keywords
6 caption terms aren't in the app name: heart, heart rate, blood pressure, heart health, low gi, diets. Captions don't count for search; the subtitle and the 100-character keyword field do.
Apply it to your app
A checklist for your next product page update.
- Make screenshot 1 match your app name and main use.
- Show the app screen in use in the first image, not only an illustration.
- Keep each caption to two short lines, with the words your users use in the large line.
- Say what the visitor gets. Avoid vague caption words like “Insight”.
- Place cards so they do not hide the screen they explain.
- Make the icon say the same thing as the app name.
How the ASO score works
- 01
App name, 25 points
Up to 10 for how much of Apple's 30 characters it uses, 10 for a brand + keyword structure, 5 when keywords fill half the name or more.
- 02
Screenshots, 35 points
Captions on every image, captions that name searched features, a first screenshot that shows the main use, one design system, readability at search size, and a trust signal.
- 03
Ratings, 25 points
Up to 15 for the average (from 4.0, full marks at 4.8) and 10 for the count (from 1,000, full marks at 100,000 ratings).
- 04
Freshness, 15 points
Full marks for an update in the last 30 days, falling to zero at 180 days. 85+ is excellent, 70+ strong, 50+ fair.
Common questions
What is an ASO score?
A 100-point check of the parts of an App Store page you control: the app name, screenshots, ratings and how recently the app was updated. It's our own scoring rule, shown in full on this page, not a number from Apple. Use it to compare your page with apps that already sell well in your category.
How long can an app name be on the App Store?
30 characters. A common pattern is a short brand followed by the main thing people search for, like “RateTracker:Blood Sugar”, which uses 23. Apple also gives you a 30-character subtitle and a 100-character keyword field for more terms.
Which screenshots show up in App Store search results?
The first one to three, when the app has no preview video. That's why the first three should cover the main reasons people download. RateTracker uses them for heart, heart rate and blood sugar.
How many screenshots can an iPhone app have?
Up to 10 per device size. Apple recommends focusing each screenshot after the first on one main benefit or feature. RateTracker uses 9.
Where do the download and revenue numbers come from?
They're third-party estimates for the US App Store, not figures reported by the developer. Treat them as a sense of scale. Growth compares the latest month with the month before.
Do screenshot captions help an app rank in search?
Apple says search results use text matches in the app name, subtitle, keywords and primary category, plus user behavior such as downloads, ratings and reviews. Captions aren't on that list: they help people who already see the app decide to download. When a caption names something people search for, put that term in the keyword field too.
Where the numbers come from
- Apple: Creating your product page
- App name limit (30 characters), up to 10 screenshots, the first one to three shown in search results, keyword field.
- Apple: App Store search
- Search results use text relevance (name, subtitle, keywords, primary category) and user behavior (downloads, ratings, reviews).
- Apple: Ratings, reviews and responses
- The in-app rating prompt can be shown up to three times in a 365-day period.
- RateTracker:Blood Sugar on the App Store
- Name, developer, category, icon, screenshots, rating, release and update dates (US storefront), checked Nov 4, 2026.
- Downloads and revenue
- Third-party est. for the US App Store, latest month, pulled Oct 29, 2026. Not reported by the developer.
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