78
BU Score
Strong
Simple Calendar - SimpleCal
✍️ bumetric analysis
“
Simple Calendar - SimpleCal is an iOS app from Yohei Fujikawa in the Productivity category, currently rated 4.7★ across 16,094 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Our BU Score puts it at 78: Strong (healthy traction). For a Productivity app, that means healthy traction.
Track changes month-over-month in the Performance section below: live snapshot history and revenue forecast included.
📊 Performance Tracking LIVE
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
Range:
💰 Forecast Revenue / mo
MODELRevenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 9 of 9 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Mid install base (16,094 ratings)METRIC | +$5,500 | |
| Excellent rating (4.7★)METRIC | +$2,200 | |
| bugsREVIEW | −$1,800 | |
| 5 starREVIEW | +$1,800 | |
| excellent appREVIEW | +$1,500 | |
| Mature app (9y old)METRIC | +$1,500 | |
| Multilingual (20 languages)METRIC | +$1,500 | |
| highly recommendREVIEW | +$1,400 | |
| slowREVIEW | −$1,200 |
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)
📈 Reviews Growth
LIVECumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jul 25
Aug 25
Sep 25
Oct 25
Nov 25
Dec 25
Jan 26
Feb 26
Mar 26
⭐ Rating Trend
LIVEAverage rating evolution. Updates with each new review batch.
🗓️ Snapshot Timeline
HISTORYEach bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →💾 33 MB🔞 4+📱 iOS 15.0+🔖 v2.7.2🔄 updated 1w ago🌐 DA, NL, EN, FI, FR +15📂 Productivity💰 Paid🚀 Launched 2017 (9y old)
📝 About this app
SimpleCal is the easiest calendar app on the App Store.
Sync your schedule across platforms and devices through iCloud or Google calendar.
- Sync
All the events on your current calendar are transferable from another calendars via iCloud or Google calendar.
(The connection uses the calendar account registered in the Settings app)
- Widget
Your recent events can be displayed on a widget to grasp what to do quickly.
- Weather
The weather forecast for the specified area is displayed on the calendar(up to one week ahead)
- Reminders
You won't miss your important events via SimpleCal's reminder.
The reminders can be repeated daily, weekly, monthly and yearly.
- Customizable interface
Each event and calendar can have different colors, which makes you easily recognize your schedule.
The color theme is also customizable. You can find your favorite theme for sure.
- Simple design
You can add or edit an event only with a few steps.
Do you have some routine in your life? Then, try SimpleCal! You can create a new event just by dragging a past event.
- Dark Mode
Supports dark mode.
- Data Backup
Saves event data to an external server such as iCloud Calendar or Google Calendar.
(The app does not have its own calendar and does not save to the device's local area.)
In the unlikely event that your iPhone is damaged, you can simply log in to your original calendar account to load your previous event data.
Sync your schedule across platforms and devices through iCloud or Google calendar.
- Sync
All the events on your current calendar are transferable from another calendars via iCloud or Google calendar.
(The connection uses the calendar account registered in the Settings app)
- Widget
Your recent events can be displayed on a widget to grasp what to do quickly.
- Weather
The weather forecast for the specified area is displayed on the calendar(up to one week ahead)
- Reminders
You won't miss your important events via SimpleCal's reminder.
The reminders can be repeated daily, weekly, monthly and yearly.
- Customizable interface
Each event and calendar can have different colors, which makes you easily recognize your schedule.
The color theme is also customizable. You can find your favorite theme for sure.
- Simple design
You can add or edit an event only with a few steps.
Do you have some routine in your life? Then, try SimpleCal! You can create a new event just by dragging a past event.
- Dark Mode
Supports dark mode.
- Data Backup
Saves event data to an external server such as iCloud Calendar or Google Calendar.
(The app does not have its own calendar and does not save to the device's local area.)
In the unlikely event that your iPhone is damaged, you can simply log in to your original calendar account to load your previous event data.
🆕 What's New · v2.7.2
･Bug fixes and performance improvements.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Simple Calendar - SimpleCal
- Developer
- Yohei Fujikawa
- Bundle ID
- jp.simplecal
- App Store URL
- Open in App Store
- Category
- Productivity
- Content rating
- 4+
- Languages
- DA, NL, EN, FI, FR, DE, HU, IT, JA, KO, NB, PL, PT, RO, RU, ZH, ES, SV, ZH, TR
Company
- Website
- simplecal.sakura.ne.jp
- Tagline
- Not found
- Description
- Not found
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- Not found
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $10.0K/mo
- Top-grossing rank
- Outside top 100 in US Productivity
- All-time revenue
- Not found
- Pricing
- Not found
Founder
- Name
- Not found
- X / Twitter
- Not found
- Not found
- GitHub
- Not found
- X followers
- Not found
- Public statements
- Not found
Funding
- Total raised
- Not found
- Last round
- Not found
- Investors
- Not found
- Crunchbase
- Not found
- AngelList
- Not found
Press & Links
- Articles found
- Not found
- Listed on
- Not found
- Blog
- Not found
- Press / News
- Not found
Contacts & Socials
- Socials
- Not found
- Not found
- Phone
- Not found
- Contact page
- Not found
- About page
- Not found
📈Ratings growth16,094 ratings+52% lifetimeShow 3-year history estimate ▾
Tracked (24 weeks) Pre-tracking estimate (36 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
Full revenue analysis
Read the article-style breakdown for Simple Calendar - SimpleCal: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.