Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault
66
Quality Score
Solid
Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault
Medium confidence
✍️ bumetric analysis
“
Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault is an iOS app from 振焯 陈 in the Utilities category, currently rated 4.2★ across 698 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.
Quality Score is 66: Solid (established niche player). For a Utilities 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
$3.5K
per month
→
12-mo forecast
$3.0K – $11.0K
per month
→
24-mo forecast
$2.8K – $25.4K
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
Loading…
Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD
💰 Estimated build cost
$45K
↳ What it cost to build · not monthly revenue
Likely range $35K – $60K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~2 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 |
| ⚙ Utilities complexity ×0.85 | $-7575 |
Total estimate
$45K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$350K
↳ What it would sell for · not monthly revenue
Marketplace range $275K – $450K · 12× MRR multiple
💸
~7.8× 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 |
| 🏷 Utilities category multiple | -10% |
| ⭐ Small user base (<1K ratings) | -8% |
Final multiple
12× MRR
👥 Estimated audience size
135K
Lifetime downloads (US-equivalent)
Monthly active
27K
Daily active
5.4K
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
| 📲 Utilities engagement | ~200 installs / rating |
| 🔁 Utilities D30 retention | 20% |
| 📍 DAU / MAU stickiness | 0.20 |
DAU / MAU
20% sticky
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$3.5K/mo · ML-estimated from 234 triggers
Growth rate
+6.0% MoM · INDIE tier baseline (compound monthly)
6 months
$3.0K – $6.9K
12 months
$3.0K – $11.0K
24 months
$2.8K – $25.4K
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
Early-stage solo · 41/100INDIE TIERexpected for tierGrowth Velocity
5.0
Founder Strength
5.5
Product Quality
5.9
Revenue Strength
3.5
Monetization Maturity
1.0
Defensibility
4.5
Market Position
0.0
Operational Safety
7.0
- 💰 Revenue: Modest — $1K - $8K/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.22★ across 698 reviews — below category median.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 3597d ago — possibly dormant.
- ⚠️ Risk: Moderate — dormant (3597d 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 = $62K-$111K. Portfolio play ($28K/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 10 of 10 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($0.00)METRIC | +$2,800 | |
| worth every pennyREVIEW | +$2,000 | |
| bugsREVIEW | −$1,800 | |
| 5 starREVIEW | +$1,800 | |
| excellent appREVIEW | +$1,500 | |
| Mature app (13y old)METRIC | +$1,500 | |
| highly recommendREVIEW | +$1,400 | |
| Good rating (4.2★)METRIC | +$800 | |
| Localized (8 languages)METRIC | +$600 | |
| Early-stage install base (698 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.
🆕 What's New · v4.0
This update from Apple will improve the functionality of this app. No new features are included.
New Features:
1.Secret Camera: take photos in calculator secretly.
2.Quick Lock: lock the app quickly by covering iPhone.
3.… Full release notes →
New Features:
1.Secret Camera: take photos in calculator secretly.
2.Quick Lock: lock the app quickly by covering iPhone.
3.… Full release notes →
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault
- Developer
- 振焯 陈
- Bundle ID
- net.cnbang.privateCal
- App Store URL
- Open in App Store
- Category
- Utilities
- Content rating
- 17+
- Languages
- EN, FR, JA, KO, RU, ZH, ES, ZH
Company
- Website
- Not found
- Tagline
- BangApps
- 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
- $28.6K/mo
- Top-grossing rank
- Outside top 100 in US Utilities
- 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.
📈Ratings growth698 ratings+58% lifetimeShow 3-year history estimate ▾
Tracked (57 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.
💰Pricing History$0.00 → $1.99 (+0%)
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
Private Calculator can hide your photos/videos/documents/notes/contacts behind a calculator. What everyone can see is just an ordinary calculator. You can access your private world by entering your password on the calculator.
FEATURES:
Private Albums:
- Import Photo/Video from Camera Roll
- Multiple size of thumbnail
- Creating custom albums
- Photo slideshow
- Full screen, full functional photo viewer.
File Manager:
- Wifi File transfer to/from PC/Mac
- Support almost all video formats: avi, mkv, wmv, flv, mp4, m4v …etc
- Support Image files: jpg, png, gif, bmp… View full description on the official store →
FEATURES:
Private Albums:
- Import Photo/Video from Camera Roll
- Multiple size of thumbnail
- Creating custom albums
- Photo slideshow
- Full screen, full functional photo viewer.
File Manager:
- Wifi File transfer to/from PC/Mac
- Support almost all video formats: avi, mkv, wmv, flv, mp4, m4v …etc
- Support Image files: jpg, png, gif, bmp… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 27 MB🔞 17+📱 iOS 7.0+🔖 v4.0🔄 updated 0d ago🌐 EN, FR, JA, KO, RU +3📂 Utilities💰 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 →
2026-05
📈
Crossed 100 ratings — social-proof flywheel kicking in
2026-05
💲
Went paid — introduced $1.99 price point
2026-03
⭐
Rating ↑ 3.93 → 4.30 (improved 0.37★)
2026-02
📈
Crossed 500 ratings — social-proof flywheel kicking in
2014-09
📈
Crossed 100 ratings — social-proof flywheel kicking in
2014-01
📈
Crossed 50 ratings — social-proof flywheel kicking in
2013-08
📈
Crossed 10 ratings — social-proof flywheel kicking in
2013-08
⭐
Rating ↑ 3.00 → 3.67 (improved 0.67★)
2013-08
🚀
First tracked snapshot — initial data captured
🔔
Track this app’s revenue
FREEGet an email when revenue moves by your threshold. No spam, unsubscribe in one click.
📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
Similar apps in Utilities
About this analysis
Why medium confidence: 698 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault make per month?▴
Based on our ML-calibrated revenue forecast, Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault earns approximately $28K/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 Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault?▴
Browse the full Utilities 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 Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault?▴
Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault is published by 振焯 陈 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 Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault's BU Score?▴
Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault has a BU Score of 66/100 (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.