QUARTET Vocab & Kanji
34
Quality Score
Emerging
QUARTET Vocab & Kanji
by Hideki Hamada
Low confidence
✍️ Bumetric analysis
“
QUARTET Vocab & Kanji is an iOS app from Hideki Hamada in the News category, currently rated 3.0★ across 6 ratings. Initial signal reads as no scraped reviews yet: judgment based on metadata only.
Quality Score is 34: Emerging (early traction worth watching). For a News app, that means early traction worth watching. 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
$1.3K
per month
→
12-mo forecast
$1.1K – $4.0K
per month
→
24-mo forecast
$1.0K – $9.2K
per month
INDIE tier
💡 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
5 snapshots on record
Rating
3.0
Reviews
6 reviews
Forecast Revenue / mo
$1.3K
Snapshots tracked
5
since Mar 2026
ONE-TIME · BUILD
💰 Estimated build cost
$100K
↳ What it cost to build · not monthly revenue
Likely range $75K – $135K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Slow ROI — current MRR is well below build cost
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 |
| ⚙ News complexity ×1.20 | +$10K |
| ⚙ 6.9y maintenance × ~1-person team | +$41K |
Total estimate
$100K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$15K
↳ What it would sell for · not monthly revenue
Marketplace range $10K – $20K · 13× MRR multiple
💸
~0.1× build cost (under-water)
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 |
| 📅 6.9y proven track record | +20% |
| ⭐ ★ rating < 3.5 (weak) | -18% |
| 🏷 News category multiple | -5% |
| ⭐ Small user base (<1K ratings) | -8% |
Final multiple
13× MRR
🛠 Estimated tech stack
🍎
Native iOS (Swift / UIKit)
Medium confidence · 70%
Also possible
Flutter
Heuristic guess from app bundle size, category, store description signals, and release-date stack era. Bumetric does not disassemble binaries — for binary-level certainty you would need an SDK intelligence tool or the manifest itself. Reasoning chain on the right. Full ruleset on /methodology.
Signals we read
| 📦 App bundle size | 46 MB |
| 🏷 Category context | News |
| 📦 Small-mid iOS bundle | → Native Swift / UIKit (pre-2020 era) |
💀 Maintenance status
Likely abandoned
95%
Last shipped 2023-07-10 · 1172 days ago
0 · Active
50 · At risk
100 · Abandoned
Heuristic risk score from time-since-last-update + ratings velocity proxy + Editor's Choice / curated featuring signals. Calibrated against 2024-2025 app-store ranking decay reports. Not a guarantee — a quiet app with a healthy codebase looks the same as an abandoned one until something breaks. Full math on /methodology.
Risk signals
| 📅 3y+ since last update | Likely abandoned |
| 👥 Small user base (6 ratings) + 6.9y old | +10% (solo-project pattern) |
Verdict
Likely abandoned
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$1.3K/mo · ML-estimated from 234 triggers
Growth rate
+6.0% MoM · INDIE tier baseline (compound monthly)
Direction
Headwinds: rating drift may slow acquisition
6 months
$1.1K – $2.5K
12 months
$1.1K – $4.0K
24 months
$1.0K – $9.2K
Compound growth at +6.0% MoM (tier baseline for INDIE). Range widens with horizon — typical noise band ±40% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.
📊
BU Investment Matrix
Pre-traction · 32/100INDIE TIERlimited signalGrowth Velocity
5.0
Founder Strength
3.3
Product Quality
2.4
Revenue Strength
3.1
Monetization Maturity
1.0
Defensibility
3.7
Market Position
2.0
Operational Safety
5.0
- 💰 Revenue: Modest — $506 - $3164/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 3.0★ across 6 reviews — weak — significant quality concerns.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 1171d ago — possibly dormant.
- ⚠️ Risk: Elevated — dormant (1171d since update).
🎯 For competitors: Vulnerable. Quality drift + slow updates create a clear opening for a fresh competitor with active dev cadence.
💵 For acquirers: Estimated asking range 18-32× monthly = $22K-$40K.
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 5 of 5 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($0.99)METRIC | +$2,800 | |
| Below-average rating (3.0★)METRIC | −$1,500 | |
| Established app (6y old)METRIC | +$800 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (6 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.
🆕 What's New · v1.3
・iOS16に対応
・iPhone 14 ProとiPhone 14 Pro Maxに対応
・不具合を修正
・iPhone 14 ProとiPhone 14 Pro Maxに対応
・不具合を修正
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- QUARTET Vocab & Kanji
- Developer
- Hideki Hamada
- Bundle ID
- Not found
- App Store URL
- Open in App Store
- Category
- News
- Content rating
- 4+
- Languages
- EN
Company
- Website
- Not found
- Tagline
- Today
- Description
- Find apps and games for iPhone, iPad, Mac, and more on the App Store.
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- Available
Revenue
- Reported revenue signal / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- Model estimate / mo
- $1.3K/mo
- Top-grossing rank
- Not found
- 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.
🌍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
With this app you can practice vocabulary and kanji introduced in the textbook “QUARTET Intermediate Japanese across the Four Language Skills”. Using the app, you can practice the words and kanji anytime and anywhere!
Number of words: 256
Number of kanji: 327
＜Vocabulary＞
Word Dictionary: You can look up the words that you need to memorize. Each word has two different example sentences; one from the textbook and one that is not from the textbook. You can listen to native pronunciation by tapping on the example sentences.… View full description on the official store →
Number of words: 256
Number of kanji: 327
＜Vocabulary＞
Word Dictionary: You can look up the words that you need to memorize. Each word has two different example sentences; one from the textbook and one that is not from the textbook. You can listen to native pronunciation by tapping on the example sentences.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 46 MB🔞 4+📱 iOS 11.0+🔖 v1.3🔄 updated 3y ago🌐 EN📂 News💰 Paid🚀 Launched 2019 (6y old)
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 0★ | 0 | — |
| 🇧🇷 BR | 0★ | 0 | — |
| 🇨🇦 CA | 0★ | 0 | — |
| 🇩🇪 DE | 0★ | 0 | — |
| 🇫🇷 FR | 0★ | 0 | — |
| 🇬🇧 GB | 0★ | 0 | — |
| 🇮🇳 IN | 0★ | 0 | — |
| 🇯🇵 JP | 3★ | 5 | 3★ this version |
| 🇺🇸 US | 3★ | 6 | 3★ this version |
🔔
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📝 Description
95
BU Score · Transcendent
About this analysis
Why low confidence: only 6 ratings · no founder-verified revenue (model estimate only) · revenue figure is directional only.
📌 Final verdict — read this before you trust the numbers above
QUARTET Vocab & Kanji is a early-stage iOS app in the news space with weak public traction — only 6 ratings, no founder-verified MRR, and not ranked in any monitored grossing chart. The app appears to be monetised, but public signals are too sparse for a precise revenue estimate.
Bottom line: treat all revenue, audience and acquisition-value numbers on this page as directional only — not founder-verified facts.
❓ Frequently Asked Questions
7 answers · auto-generated from this app's public dataHow much does QUARTET Vocab & Kanji make per month?▴
Low-confidence model estimate. QUARTET Vocab & Kanji has only 6 App Store ratings, so our revenue model has very little signal to work with — treat the ~$1.3K/mo figure as directional only, not a verified MRR. No founder-verified revenue data is available for this app. See methodology for the formula and confidence bands.
What apps are like QUARTET Vocab & Kanji?▴
Browse the full News 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.
What is QUARTET Vocab & Kanji built with?▴
Our heuristic places QUARTET Vocab & Kanji on the Native iOS (Swift / UIKit) stack (Medium confidence, 70%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Flutter.
Is QUARTET Vocab & Kanji still actively maintained?▴
Maintenance status: Likely abandoned (95% abandonment risk). Last shipped version was 3+ years ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
When was QUARTET Vocab & Kanji last updated?▴
QUARTET Vocab & Kanji last shipped a new version on 2023-07-10 — more than 3 year(s) ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes QUARTET Vocab & Kanji?▴
QUARTET Vocab & Kanji is published by Hideki Hamada 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 QUARTET Vocab & Kanji's BU Score?▴
QUARTET Vocab & Kanji has a BU Score of 34/100 (Emerging). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.