Scientific Calculator fx-991
58
Quality Score
Solid
Scientific Calculator fx-991
Medium confidence
✍️ bumetric analysis
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Scientific Calculator fx-991 is an iOS app from Dinh Phuc in the News category, currently rated 4.5★ across 333 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 58: Solid (established niche player). For a News 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
$200
per month
→
12-mo forecast
$100 – $931
per month
→
24-mo forecast
$100 – $2790
per month
MICRO 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
$60K
↳ What it cost to build · not monthly revenue
Likely range $45K – $80K
$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 |
Total estimate
$60K
👥 Estimated audience size
39K
Lifetime downloads (US-equivalent)
Monthly active
5.9K
Daily active
2.6K
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
| 📲 News engagement | ~120 installs / rating |
| 🔁 News D30 retention | 15% |
| 📍 DAU / MAU stickiness | 0.45 |
DAU / MAU
44% sticky
🔬
How we forecast this revenue
LOW CONFIDENCEBaseline
$200/mo · ML-estimated from 234 triggers
Growth rate
+8.0% MoM · MICRO tier baseline (compound monthly)
Direction
Headwinds: low defensibility moat
6 months
$127 – $508
12 months
$100 – $931
24 months
$100 – $2.8K
Compound growth at +8.0% MoM (tier baseline for MICRO). Range widens with horizon — typical noise band ±60% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.
📊
BU Investment Matrix
Insufficient data · 38/100MICRO TIERtoo early to scoreGrowth Velocity
5.0
Founder Strength
2.9
Product Quality
6.3
Revenue Strength
2.3
Monetization Maturity
1.0
Defensibility
2.8
Market Position
0.0
Operational Safety
10.0
- 💰 Revenue: Marginal — $0 - $500/mo · MICRO tier · indicative confidence, trajectory unclear.
- ⭐ Quality: 4.53★ across 333 reviews — solid.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: Insufficient signal to assess trajectory.
- ⚠️ Risk: Low — no material risk signals detected.
🎯 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 = $3K-$6K.
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:
| Excellent rating (4.5★)METRIC | +$2,200 | |
| Multilingual (59 languages)METRIC | +$1,500 | |
| Established app (3y old)METRIC | +$800 | |
| Ad-supported / freemiumMETRIC | +$600 | |
| Early-stage install base (333 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 · v1.8.3
Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits.
∙ We have added more physics and math formulas.
∙ Free users can now search without limits.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Scientific Calculator fx-991
- Developer
- Dinh Phuc
- Bundle ID
- dinhphuc1993.ExemplePhucnd
- App Store URL
- Open in App Store
- Category
- News
- Content rating
- 4+
- Languages
- AF, SQ, AR, HY, AZ, EU, BE, BG, CA, HR, CS, DA, NL, EN, ET, FI, FR, GL, KA, DE, EL, GU, HE, HI, HU, IS, ID, IT, JA, KN, KK, KO, KY, LV, LT, MK, MS, ML, MN, NE, NB, FA, PL, PT, RO, RU, SR, ZH, SI, SK, SL, ES, SV, TH, TR, UK, UR, VI, ZU
Company
- Website
- Not found
- 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
- $86/mo
- Top-grossing rank
- Outside top 100 in US News
- 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 growth333 ratings+484% lifetimeShow 3-year history estimate ▾
Tracked (19 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
Scientific Calculator fx-991 – The Ultimate Math & Science Tool!
Struggling with math problems, equations, or integrals? Need a powerful scientific calculator to solve step-by-step?
With Scientific Calculator fx-991, you can calculate, graph, and find formulas instantly – making learning math, physics, and chemistry easier than ever!
Key Features
+ Step-by-step equation solver – Enter any equation and get a detailed step-by-step solution.
+ Advanced scientific functions – Solve fractions, algebra, derivatives, integrals, trigonometry, and more.… View full description on the official store →
Struggling with math problems, equations, or integrals? Need a powerful scientific calculator to solve step-by-step?
With Scientific Calculator fx-991, you can calculate, graph, and find formulas instantly – making learning math, physics, and chemistry easier than ever!
Key Features
+ Step-by-step equation solver – Enter any equation and get a detailed step-by-step solution.
+ Advanced scientific functions – Solve fractions, algebra, derivatives, integrals, trigonometry, and more.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 26 MB🔞 4+📱 iOS 15.0+🔖 v1.8.3🔄 updated 0d ago🌐 AF, SQ, AR, HY, AZ +54📂 News💰 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
🔄
Monetization changed: freemium → free
2026-03
⭐
Rating ↑ 3.78 → 4.70 (improved 0.92★)
2026-03
📈
Crossed 50 ratings — social-proof flywheel kicking in
2025-09
📈
Crossed 10 ratings — social-proof flywheel kicking in
2024-12
⭐
Rating ↑ 3.25 → 3.60 (improved 0.35★)
2024-11
⭐
Rating ↓ 3.67 → 3.25 (dropped 0.42★)
2024-06
⭐
Rating ↑ 3.00 → 3.67 (improved 0.67★)
2024-05
⭐
Rating ↓ 5.00 → 3.00 (dropped 2.00★)
2023-12
🚀
First tracked snapshot — initial data captured
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for Scientific Calculator fx-991: 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: 333 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does Scientific Calculator fx-991 make per month?▴
Based on our ML-calibrated revenue forecast, Scientific Calculator fx-991 earns approximately $86/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 Scientific Calculator fx-991?▴
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.
Who makes Scientific Calculator fx-991?▴
Scientific Calculator fx-991 is published by Dinh Phuc 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 Scientific Calculator fx-991's BU Score?▴
Scientific Calculator fx-991 has a BU Score of 58/100 (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.