Check Calendar - Звички
73
Quality Score
Strong
Check Calendar - Звички
Medium confidence
✍️ bumetric analysis
“
Check Calendar - Звички is an iOS app from naoki otsu in the Productivity category, currently rated 4.8★ across 1,327 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.
Quality Score is 73: Strong (healthy traction). For a Productivity app, that means healthy traction. The full BU Investment Matrix below scores 8 dimensions including monetisation, growth, and operational risk.
Track changes month-over-month in the Performance section below: live snapshot history and revenue forecast included.
💰 Monthly revenue · now vs forecast
● Right now
$5.0K
per month
→
12-mo forecast
$5.2K – $10.8K
per month
→
24-mo forecast
$6.4K – $19.2K
per month
MID tierSUBSCRIPTION
💡 Grow this revenue
Free AI audit of this app’s store listing
- Title & subtitle keyword fit
- Description hook & conversion structure
- Screenshots, ratings, reviews strategy
Typical impact: +2-5× organic installs
📊 Performance Tracking LIVE
Loading…
Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD
💰 Estimated build cost
$60K
↳ What it cost to build · not monthly revenue
Likely range $45K – $80K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~6 months at current MRR
Synthetic estimate. Inputs: category complexity, file size, screen count, monetization layer, platform reach, age × team-size proxy. Calibrated against 2024-2026 indie-agency rate surveys. Full math + source list on /methodology.
Where the money goes
| 🧱 MVP baseline (design + 1-store ship) | +$28K |
| 📱 5 unique screens × $4.5K | +$22K |
| 📦 Asset bundle (58 MB) | +$3K |
| ⚙ Productivity complexity ×1.10 | +$5K |
Total estimate
$60K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$200K
↳ What it would sell for · not monthly revenue
Marketplace range $150K – $250K · 19× MRR multiple
💸
~3.3× return on build cost
Synthetic estimate. Multiple band derived from ad-supported + age, rating quality, category demand, and user-base maturity. Calibrated against 2024-2026 indie-app-marketplace closed-deal medians. Full math + comparable deal list on /methodology.
How the multiple was built
| 📺 Ad-supported base | 15× MRR |
| ⭐ ★ rating ≥ 4.7 (premium) | +15% |
| 🏷 Productivity category multiple | +8% |
Final multiple
19× MRR
👥 Estimated audience size
99K
Lifetime downloads (US-equivalent)
Monthly active
29K
Daily active
13K
Synthetic estimate from ratings × category benchmarks. Calibrated against 2024-2026 mobile-attribution retention + DAU/MAU reports. Numbers are US-storefront-equivalent — true global audience can be 5-10× larger for international apps. Full math + source list on /methodology.
How we sized it
| 📲 Productivity engagement | ~75 installs / rating |
| 🔁 Productivity D30 retention | 30% |
| 📍 DAU / MAU stickiness | 0.45 |
DAU / MAU
44% sticky
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$5.0K/mo · ML-estimated from 234 triggers
Growth rate
+4.0% MoM · MID tier baseline (compound monthly)
Direction
Tailwinds: monetization model proven
6 months
$4.7K – $7.9K
12 months
$5.2K – $10.8K
24 months
$6.4K – $19.2K
Compound growth at +4.0% MoM (tier baseline for MID). Range widens with horizon — typical noise band ±25% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.
📊
BU Investment Matrix
Below median · 53/100MID TIERSUBSCRIPTIONunderperforming peersGrowth Velocity
5.0
Founder Strength
5.0
Product Quality
7.1
Revenue Strength
3.7
Monetization Maturity
9.5
Defensibility
5.8
Market Position
2.0
Operational Safety
4.3
- 💰 Revenue: Modest — $3K - $7K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.75★ across 1,327 reviews — solid.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: dev shipping weekly.
- ⚠️ Risk: Elevated — scam/fraud mentions detected, rating drift -1.81 ★ (recent 50 vs lifetime).
🎯 For competitors: Vulnerable. Quality drift + slow updates create a clear opening for a fresh competitor with active dev cadence.
💵 For acquirers: Estimated asking range 12-22× monthly = $60K-$110K. Portfolio play ($10K/mo combined) commands premium. Discount applied for operational risk..
Composite of 8 dimensions computed deterministically from public signals — no LLM, every score traces back to a measurable input. Default weights shown; "compete" / "acquire" / "invest" lenses re-weight without re-fetching.
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 6 of 6 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Excellent rating (4.8★)METRIC | +$2,200 | |
| 5 starREVIEW | +$1,800 | |
| Low install base (1,327 ratings)METRIC | +$1,500 | |
| Multilingual (24 languages)METRIC | +$1,500 | |
| Established app (5y old)METRIC | +$800 | |
| Ad-supported / freemiumMETRIC | +$600 |
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.
🆕 What's New · v14.27.0
- The latest version includes new features, bug fixes, and performance improvements.
Thank you for always using our app.
We will continue to develop it with the valuable feedback from everyone.… Full release notes →
Thank you for always using our app.
We will continue to develop it with the valuable feedback from everyone.… Full release notes →
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Check Calendar - Звички
- Developer
- naoki otsu
- Bundle ID
- com.checkcalendar
- App Store URL
- Open in App Store
- Category
- Productivity
- Content rating
- 4+
- Languages
- CS, DA, NL, EN, FR, DE, HI, HU, ID, IT, JA, KO, PL, PT, RO, RU, ZH, ES, SV, TH, ZH, TR, UK, VI
Company
- Website
- Not found
- Tagline
- Not found
- Description
- Check Calendar is an iPhone and Android app for tapping and recording on the calendar. You can easily record your daily life and check your life.
- 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
- $10.4K/mo
- Top-grossing rank
- Outside top 100 in US Productivity
- All-time revenue
- Not found
- Pricing
- Not found
Founder
Founder data not yet collected for this app.
Funding
Funding data not yet collected for this app.
Press & Links
Press & Links data not yet collected for this app.
Contacts & Socials
Contacts & Socials data not yet collected for this app.
⭐Recent App Store Reviews49 latest · avg 3.35★ · 49.0% 5★ · 28.6% 1★
5★24 (49%)
4★3 (6%)
3★2 (4%)
2★6 (12%)
1★14 (29%)
+119 ratings/week
Praise: great ×9 love ×4 perfect ×3 best ×2 fantastic ×1Complaints: scam ×2 subscription ×2 expensive ×1 terrible ×1
Top positive
★★★★★ Easy to Use
Great app for easily tracking…
★★★★★ Gracias
Está fabuloso esto…
Top negative
★☆☆☆☆ Paywall scam
App baits you into thinking it’s free. It waits until you’ve used it for x consecutive days then it takes away your access unless you spend money. What a scam.…
★☆☆☆☆ Paid use???
Why is the iPhone app paid? And only gives you a week-long trial, while it's free on Android?…
📈Ratings growth1,327 ratings+132600% lifetimeShow 3-year history estimate ▾
Tracked (49 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.
📝 About this app
Check Calendar lets you tick your calendar to record habits.
It packs one-tap checks, notes, unlimited tabs, emojis, reports, notifications, backup/restore, dark mode, and more.
■ Check on the calendar
Record habits with a single tap on the calendar.
■ Notes
Supports short or long notes—write freely and keep everything.
■ Unlimited tabs
Create limitless categories like "Workout," "Study," or "Reading."
■ Emojis
Change checkmarks to any emoji you like.
■ Reports
Visualize habit progress with graphs. Switch periods such as "Last 7 days," "Last 28 days," or "Last 6 months."
■ History… View full description on the official store →
It packs one-tap checks, notes, unlimited tabs, emojis, reports, notifications, backup/restore, dark mode, and more.
■ Check on the calendar
Record habits with a single tap on the calendar.
■ Notes
Supports short or long notes—write freely and keep everything.
■ Unlimited tabs
Create limitless categories like "Workout," "Study," or "Reading."
■ Emojis
Change checkmarks to any emoji you like.
■ Reports
Visualize habit progress with graphs. Switch periods such as "Last 7 days," "Last 28 days," or "Last 6 months."
■ History… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 58 MB🔞 4+📱 iOS 15.1+🔖 v14.27.0🔄 updated 0d ago🌐 CS, DA, NL, EN, FR +19📂 Productivity💰 Paid
📅
What Worked™ · Development Pipeline
9 EVENTS TRACKEDDetected changes in this app over its tracked lifetime — each event links cause (what changed) to effect (what moved). Sorted newest first.See full history →Version history →
2026-03
⭐
Rating ↓ 4.80 → 3.32 (dropped 1.48★)
2026-03
📈
Crossed 50 ratings — social-proof flywheel kicking in
2026-03
⭐
Rating ↑ 3.35 → 4.80 (improved 1.45★)
2024-05
📈
Crossed 10 ratings — social-proof flywheel kicking in
2024-01
⭐
Rating ↓ 3.20 → 2.83 (dropped 0.37★)
2023-11
⭐
Rating ↑ 2.75 → 3.20 (improved 0.45★)
2023-10
⭐
Rating ↑ 2.00 → 2.75 (improved 0.75★)
2023-09
⭐
Rating ↑ 1.00 → 2.00 (improved 1.00★)
2022-05
🚀
First tracked snapshot — initial data captured
🔎
ASO Keyword Positions
BEST RANK #41Ranked for 1 App Store search query in our last keyword sweep. Lower position = closer to the top.
habit tracker·#41🇺🇸
Last sweep: 2026-05-19 · iTunes Search API
🗣
Voice of Customer
Based on 157 reviews across 9 markets● 43% positive · ● 43% neutral · ● 14% negative · Rating drift: -1.81★ (declining — recent 50: 2.94★ vs lifetime: 4.75★)
VADER compound sentiment per quarter (−1 = fully negative, +1 = fully positive). Each point ≥ 5 reviews.
Sentiment by country (−1 to +1)
🇩🇪 DE
+0.91
🇮🇳 IN
+0.67
🇬🇧 GB
+0.50
🇺🇸 US
+0.40
🇫🇷 FR
+0.40
🇨🇦 CA
+0.35
🇧🇷 BR
+0.05
🇯🇵 JP
-0.02
🇦🇺 AU
-0.42
Top praise themes
keep track ×3 mark off ×3 simple ×16 one ×11 see ×10 add ×8 perfect ×8 thank ×7
Top complaint themes
after week ×6 free trial ×6 trial period ×4 week free ×4 premium version ×3 pay ×22 money ×10 only ×8
Risk signals
Subscription complaints: 4% Fraud / scam mentions: 3.8%
🧪
Tech & Domain Intel — checkcalendar.app
- Tech stack
- Brevo (formerly Sendinblue) · Google Workspace
Derived from public RDAP + DNS TXT records (no scraping, no login).
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 4.57971★ | 69 | 4.57971★ this version |
| 🇧🇷 BR | 4.86982★ | 845 | 4.86982★ this version |
| 🇨🇦 CA | 4.57534★ | 146 | 4.57534★ this version |
| 🇩🇪 DE | 4.47727★ | 44 | 4.47727★ this version |
| 🇫🇷 FR | 4.65475★ | 84 | 4.65475★ this version |
| 🇬🇧 GB | 4.71533★ | 137 | 4.71533★ this version |
| 🇮🇳 IN | 4.66711★ | 748 | 4.66711★ this version |
| 🇯🇵 JP | 4.52067★ | 1,548 | 4.52067★ this version |
| 🇺🇸 US | 4.75433★ | 1,327 | 4.75433★ this version |
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for Check Calendar - Звички: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
Similar apps in Productivity
About this analysis
Why medium confidence: 1,327 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does Check Calendar - Звички make per month?▴
Based on our ML-calibrated revenue forecast, Check Calendar - Звички earns approximately $10K/mo. This is a US-storefront-equivalent estimate; global revenue can be several times larger for internationally-distributed apps. See the methodology page for the full formula and confidence bands.
What apps are like Check Calendar - Звички?▴
Browse the full Productivity category catalog to find similar apps with revenue, build cost, audience and tech stack data. Each /p/{slug} page also shows a Compare side-by-side widget with three peer apps from the same niche.
Who makes Check Calendar - Звички?▴
Check Calendar - Звички is published by naoki otsu on the Apple App Store. See the full publisher portfolio (other apps by the same developer) via the More by developer block on the product page above.
What is Check Calendar - Звички's BU Score?▴
Check Calendar - Звички has a BU Score of 73/100 (Strong). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.