60
Quality Score
Solid
勇敢開口說英語，別怕說錯，因為老外一定聽得懂！
Medium confidence
✍️ bumetric analysis
“
勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ is an Android app from Otek International Inc. in the Education category, currently rated 4.5★ across 912 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 60: Solid (established niche player). For a Education app, that means established niche player. 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 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
Loading…
Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD💰 Estimated build cost
$165K
↳ What it cost to build · not monthly revenue
Likely range $125K – $225K
$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 |
| 💎In-app purchase plumbing | +$9K |
| ⚙Education complexity ×1.20 | +$11K |
| 🌐Cross-platform reach (iOS + Android) | +$39K |
| ⚙8.7y maintenance × ~1-person team | +$52K |
Total estimate$165K
👥 Estimated audience size
54K
Lifetime downloads (US-equivalent)
Monthly active
5.8K
Daily active
1.7K
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
| 📲Education engagement | ~85 installs / rating |
| 📅8.7y of rating accumulation | -30% |
| 🔁Education D30 retention | 18% |
| 📍DAU / MAU stickiness | 0.30 |
DAU / MAU29% sticky
🛠 Estimated tech stack
🤖
Native Android (Kotlin)
High confidence · 80%
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
| 🏷Category context | Education |
| 📦Compact Android bundle | → Native Kotlin |
💀 Maintenance status
Likely abandoned
72%
Last shipped 2024-08-14 · 648 days ago
0 · Active50 · At risk100 · 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
| 📅1y 9mo since last update | Likely deprioritized |
VerdictLikely abandoned
🔬
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)
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 · 55/100MID TIERunderperforming peersRevenue Strength
3.7
Product Quality
6.4
Market Position
0.0
Growth Velocity
5.0
Defensibility
9.7
Operational Safety
7.0
Founder Strength
7.2
Monetization Maturity
5.0
- 💰 Revenue: Modest — $3K - $7K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.54★ across 912 reviews — solid.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 648d ago — possibly dormant.
- ⚠️ Risk: Moderate — dormant (648d since update).
🎯 For competitors: Mixed picture. Worth competing if you have a clear UX or pricing edge — otherwise crowded segment.
💵 For acquirers: Estimated asking range 18-32× monthly = $90K-$160K. Portfolio play ($46K/mo combined) commands premium.
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 4 of 4 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Excellent rating (4.5★)METRIC | +$2,200 | |
| Mature app (8y old)METRIC | +$1,500 | |
| Ad-supported / freemiumMETRIC | +$600 | |
| Early-stage install base (912 ratings)METRIC | +$400 |
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.
App Specs
🔐 Own this app? Claim & verify MRR →🔖 v1.21🔄 updated 1y ago📂 Education💰 Free📺 Ad-supported💎 IAP $2.99 per item🚀 Launched 2017 (8y old)
📝 About this app
用最貼近老外的說法，學最實用的口語會話，不用背幾千個單字，不需記幾十個文法，用英語溝通很簡單，開口說一點都不難。本 app 根據名師蔣志榆編著之「勇敢開口說英語」一書製作而成，善用本書內容，不用出國學也能開口說流利的英語。
本 app 檔案超過 100M，須使用 wi-fi 才能下載。
◎精選主題分類，讓你輕鬆開口說
每一課依主題、情境，針對不同的職場領域及族群做詳細的學習重點與戰力分析，讓讀者能輕鬆掌握明確的學習目標，規劃屬於自己的讀書計畫，提升學習成效。
◎連政商名流都在用的英語句型
名師嚴選的好用句型，將英文句型分解念出，讓你不必看書也能學習萬用英語句型。並同時收錄全部例句和對話。邊聽邊學，大家都在用的那句話，你也能輕鬆開口說！
◎嚴選最強例句，臨時需要也好用
每個英語句型皆提供最好用的例句，讓學習者隨時應用，只要套上你需要的關鍵字，你也能快速講出臨時需要的那句話！隨機補充單字和老外其實也會這樣說的道地說法，讓你一次學會最實用的英語表達法！
◎對話情境式學習，關鍵句型忘不了
單句學習當然不夠力！每篇句型都附上情境式對話，讓學習者更能瞭解句型的用法，同時加深印象，想忘也忘不了。之後不管是遇到類似狀況，或是要跟老外聊天，馬上就能套用，不僅學習好用，更能真正加強你的英語實力！
◎特別設計的學習課程，開口說英語16天快速養成… View full description on the official store →
本 app 檔案超過 100M，須使用 wi-fi 才能下載。
◎精選主題分類，讓你輕鬆開口說
每一課依主題、情境，針對不同的職場領域及族群做詳細的學習重點與戰力分析，讓讀者能輕鬆掌握明確的學習目標，規劃屬於自己的讀書計畫，提升學習成效。
◎連政商名流都在用的英語句型
名師嚴選的好用句型，將英文句型分解念出，讓你不必看書也能學習萬用英語句型。並同時收錄全部例句和對話。邊聽邊學，大家都在用的那句話，你也能輕鬆開口說！
◎嚴選最強例句，臨時需要也好用
每個英語句型皆提供最好用的例句，讓學習者隨時應用，只要套上你需要的關鍵字，你也能快速講出臨時需要的那句話！隨機補充單字和老外其實也會這樣說的道地說法，讓你一次學會最實用的英語表達法！
◎對話情境式學習，關鍵句型忘不了
單句學習當然不夠力！每篇句型都附上情境式對話，讓學習者更能瞭解句型的用法，同時加深印象，想忘也忘不了。之後不管是遇到類似狀況，或是要跟老外聊天，馬上就能套用，不僅學習好用，更能真正加強你的英語實力！
◎特別設計的學習課程，開口說英語16天快速養成… View full description on the official store →
🔔
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Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！
- Developer
- Otek International Inc.
- Bundle ID
- com.otek.talkengbravetch
- App Store URL
- Open in App Store
- Category
- Education
- Content rating
- Not found
- Languages
- Not found
Company
- Website
- www.transwhiz.com
- 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
- $484/mo
- Top-grossing rank
- Not found
- All-time revenue
- Not found
- Pricing
- $2.99 per item
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.
📈Ratings growth912 ratings+18% lifetimeShow 3-year history estimate ▾
Tracked (1 weeks) Pre-tracking estimate (36 weeks) · model-based, ±5% noise · anchored to release date and current value
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.
More by Otek International Inc.
View all →📦 Portfolio summaryINDIE studio
28apps·$46K/mocombined
✓ Diversified — top app contributes 11%; risk spread across portfolio
Full revenue analysis
Read the article-style breakdown for 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
About this analysis
Why medium confidence: 912 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
9 answers · auto-generated from this app's public dataHow much does 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ make per month?▴
Based on our ML-calibrated revenue forecast, 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ earns approximately $483/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.
Is 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ profitable?▴
With estimated build cost $165K and monthly revenue $483, 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ looks well below break-even — current monthly revenue is much smaller than the estimated build cost. Profitability also depends on paid-acquisition spend and refund rate which the public model doesn't see.
How many users does 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ have?▴
Estimated audience: ~54K lifetime downloads, ~5K monthly active users, and ~1K daily active users. Derived from ratings count × category installs-per-rating × age decay. US-storefront-equivalent — global audience can be 5-10× larger for internationally-distributed apps.
What apps are like 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！?▴
Browse the full Education 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 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ built with?▴
Our heuristic places 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ on the Native Android (Kotlin) stack (High confidence, 80%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Flutter.
Is 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ still actively maintained?▴
Maintenance status: Likely abandoned (72% abandonment risk). Last shipped version was 1+ years ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
When was 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ last updated?▴
勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ last shipped a new version on 2024-08-14 — more than 1 year(s) ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！?▴
勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ is published by Otek International Inc. on the Google Play 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 勇敢開口說英語，別怕說錯，因為老外一定聽得懂！'s BU Score?▴
勇敢開口說英語，別怕說錯，因為老外一定聽得懂！ has a BU Score of 60/100 (Solid). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.