Notan
55
Quality Score
Solid
✍️ Bumetric analysis
“
Notan is an iOS app from Tien Do Nam in the Utilities category, currently rated 4.6★ across 48 ratings. Initial signal reads as no scraped reviews yet: judgment based on metadata only.
Quality Score is 55: 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
$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
6 snapshots on record
Rating
4.6
Reviews
48 reviews
Forecast Revenue / mo
$5.0K
Snapshots tracked
6
since Mar 2026
🤖Also on Android
$275/mo · 2K ratings · 4.9★
View →
ONE-TIME · BUILD
💰 Estimated build cost
$85K
↳ What it cost to build · not monthly revenue
Likely range $65K – $115K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~1.4y 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 |
| ⚙ 6.7y maintenance × ~1-person team | +$40K |
Total estimate
$85K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$75K
↳ What it would sell for · not monthly revenue
Marketplace range $50K – $100K · 16× MRR multiple
💸
~0.9× 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 |
| 📅 6.7y proven track record | +20% |
| ⭐ ★ rating ≥ 4.4 (solid) | +8% |
| 🏷 Utilities category multiple | -10% |
| ⭐ Small user base (<1K ratings) | -8% |
Final multiple
16× MRR
🛠 Estimated tech stack
🍎
Native iOS (SwiftUI)
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 | 40 MB |
| 🏷 Category context | Utilities |
| 📦 Small-mid iOS bundle | → Native SwiftUI (post-2020 era) |
💀 Maintenance status
Active
15%
Last shipped 2026-09-16 · 17 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
| 📅 17 days since last update | Active development |
| 👥 Small user base (48 ratings) + 6.7y old | +10% (solo-project pattern) |
Verdict
Active
🔬
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
Headwinds: rating drift may slow acquisition
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 · 46/100MID TIERunderperforming peersGrowth Velocity
5.0
Founder Strength
5.9
Product Quality
3.7
Revenue Strength
3.7
Monetization Maturity
1.0
Defensibility
5.2
Market Position
2.0
Operational Safety
10.0
- 💰 Revenue: Modest — $3K - $7K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.63★ across 48 reviews — weak — significant quality concerns.
- 📍 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 = $90K-$160K. Portfolio play ($14K/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 5 of 5 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Excellent rating (4.6★)METRIC | +$2,200 | |
| Established app (6y old)METRIC | +$800 | |
| Ad-supported / freemiumMETRIC | +$600 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (48 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 · v2.20.0
Improved templates
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Notan
- Developer
- Tien Do Nam
- Bundle ID
- de.tiendonam.notan
- App Store URL
- Open in App Store
- Category
- Utilities
- 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
- $5.0K/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.
🌍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.
🚀Update Frequency · Releases per Quarter5 releases tracked
🚀Version Release Timeline5 releases tracked
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
The universal grade calculator.
Notan helps students keep track of every grade and instantly see where they stand. Add your subjects, enter your grades, and watch your averages update in real time.
Built for your school system
Notan isn't a one-size-fits-all calculator. Pick your country and get a grade system that actually matches your school: Germany (including full Abitur support), Austria, Switzerland, Spain, France, Italy, Vietnam, and International (build your own custom grading scale).
Powerful, yet simple… View full description on the official store →
Notan helps students keep track of every grade and instantly see where they stand. Add your subjects, enter your grades, and watch your averages update in real time.
Built for your school system
Notan isn't a one-size-fits-all calculator. Pick your country and get a grade system that actually matches your school: Germany (including full Abitur support), Austria, Switzerland, Spain, France, Italy, Vietnam, and International (build your own custom grading scale).
Powerful, yet simple… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 40 MB🔞 4+📱 iOS 15.0+🔖 v2.20.0🔄 updated 2w ago🌐 EN📂 Utilities💰 Paid🚀 Launched 2020 (6y old)
📅
What Worked™ · Development Pipeline
6 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 →
2026-08
🔧
Shipped update — v2.19.8 → v2.19.9
2026-07
🔧
Shipped update — v2.19.7 → v2.19.8
2026-07
📈
Crossed 50 ratings — social-proof flywheel kicking in
2026-06
🔧
Shipped update — v2.19.6 → v2.19.7
→ 30 days after: reviews +6 low · multiple changes
2026-05
🔄
Monetization changed: freemium → free
→ 30 days after: rating −0.05★ high confidence
2026-03
🚀
First tracked snapshot — initial data captured
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 5★ | 1 | 5★ this version |
| 🇧🇷 BR | 5★ | 1 | 5★ this version |
| 🇨🇦 CA | 5★ | 1 | 5★ this version |
| 🇩🇪 DE | 4.68316★ | 9,295 | 4.68316★ this version |
| 🇫🇷 FR | 4.875★ | 8 | 4.875★ this version |
| 🇬🇧 GB | 5★ | 3 | 5★ this version |
| 🇮🇳 IN | 5★ | 1 | 5★ this version |
| 🇯🇵 JP | 5★ | 2 | 5★ this version |
| 🇺🇸 US | 4.58929★ | 56 | 4.58929★ this version |
🔔
Track this app’s revenue
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📝 Description
95
BU Score · Transcendent
More by Tien Do Nam
View all →📦 Portfolio summaryINDIE studio
4apps·$15K/mocombined
✓ Diversified — top app contributes 32%; risk spread across portfolio
About this analysis
Why low confidence: only 48 ratings · no founder-verified revenue (model estimate only) · revenue figure is directional only.
❓ Frequently Asked Questions
9 answers · auto-generated from this app's public dataHow much does Notan make per month?▴
Based on our ML-calibrated revenue forecast, Notan earns approximately $5.0K/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 Notan profitable?▴
With estimated build cost $85K and monthly revenue $5.0K, Notan looks break-even-grade — payback period sits around 1.4 years. Profitability also depends on paid-acquisition spend and refund rate which the public model doesn't see.
What apps are like Notan?▴
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.
What is Notan built with?▴
Our heuristic places Notan on the Native iOS (SwiftUI) 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 Notan still actively maintained?▴
Maintenance status: Active (15% abandonment risk). Last shipped version was 17 days ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
How much would Notan sell for?▴
Estimated acquisition value: $75K (marketplace range $50K – $100K). Calculated as 16× monthly revenue using the standard multiple for the detected monetization model + adjustments for age, rating quality and category demand. Calibrated against 2024-2026 Flippa / Acquire.com / MicroAcquire closed-deal medians.
When was Notan last updated?▴
Notan last shipped a new version on 2026-09-16 — less than a month ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes Notan?▴
Notan is published by Tien Do Nam 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 Notan's BU Score?▴
Notan has a BU Score of 55/100 (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.