63
BU Score
Solid
Kurumaki Calendar
✍️ bumetric analysis
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Kurumaki Calendar is an iOS app from LITTLEN STAR Inc. in the Productivity category, currently rated 4.5★ across 33 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.
Our BU Score puts it at 63: Solid (established niche player). For a Productivity app, that means established niche player.
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
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Reviews
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Forecast Revenue / mo
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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 7 of 7 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($1.99)METRIC | +$2,800 | |
| Excellent rating (4.5★)METRIC | +$2,200 | |
| 5 starREVIEW | +$1,800 | |
| Mature app (15y old)METRIC | +$1,500 | |
| Multilingual (31 languages)METRIC | +$1,500 | |
| highly recommendREVIEW | +$1,400 | |
| Pre-traction phase (33 ratings)METRIC | −$300 |
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.
⭐ 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 →💾 10 MB🔞 4+📱 iOS 12.0+🔖 v2.9.11🔄 updated 5mo ago🌐 AR, CA, CS, DA, NL +26📂 Productivity💰 Paid🚀 Launched 2011 (15y old)
📝 About this app
Long seller app in Japan since 2011.
・ You can see the current month and the following month continuously.
・ Your schedule will not be divided by the month boundary.
・ You always see yours appointments through six weeks.
・ Calendar color selection settings.
・ Event color selection settings.
・ Settings for change of color pallete of Calendars and individuals Events.
・ Customizable Calendar display range
・ You can see the current month and the following month continuously.
・ Your schedule will not be divided by the month boundary.
・ You always see yours appointments through six weeks.
・ Calendar color selection settings.
・ Event color selection settings.
・ Settings for change of color pallete of Calendars and individuals Events.
・ Customizable Calendar display range
🆕 What's New · v2.9.11
This update includes Japan’s public holiday information.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Kurumaki Calendar
- Developer
- LITTLEN STAR Inc.
- Bundle ID
- com.littlenstar.kurumakicalendar
- App Store URL
- Open in App Store
- Category
- Productivity
- Content rating
- 4+
- Languages
- AR, CA, CS, DA, NL, EN, FI, FR, DE, EL, HE, HU, ID, IT, JA, KO, MS, NB, PL, PT, RO, RU, ZH, SK, ES, SV, TH, ZH, TR, UK, VI
Company
- Website
- www.littlenstar.com
- Tagline
- Not found
- Description
- くるまきカレンダー（iPhoneアプリ/紙）の制作・販売とWEB/DTPデザイン制作のフリーランス
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- OG image
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $18.5K/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
- http://littlenstar.com/support/
- About page
- Not found
⭐Recent App Store Reviews31 latest · avg 4.52★ · 77.4% 5★ · 3.2% 1★
5★24 (77%)
4★3 (10%)
3★1 (3%)
2★2 (6%)
1★1 (3%)
+0 ratings/week
Praise: love ×11 best ×7 great ×6 awesome ×4 perfect ×3Complaints: hate ×1
Top positive
★★★★★ So great!
This is the best with the best looking software I've ever used!…
★★★★★ 😘
Love it! More options for scheduling repeating events would be helpful... Every 3rd week, etc.…
Top negative
★☆☆☆☆ Keeps erasing events!
I used to love this app, but recently, it has been erasing events, or moving them to arbitrary dates. I’ve deleted the app totally, as I can’t afford to miss out on important appointments, meetings, etc..…
★★☆☆☆ I like it but want to love it again
I use to love this app until I recently updated my phone. Please update to current IOS so the app can accommodate dark mode on IPhone. Currently when in dark mode and adding to the calendar you cannot see what’s being typed and there are bl…
📈Ratings growth33 ratings+3200% lifetimeShow 3-year history estimate ▾
Tracked (31 weeks) Pre-tracking estimate (37 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 Kurumaki Calendar: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.