tellows Caller ID & Blocker
71
Quality Score
Strong
tellows Caller ID & Blocker
by Netzberater
Medium confidence
✍️ Bumetric analysis
“
tellows Caller ID & Blocker is an iOS app from Netzberater in the Utilities category, currently rated 4.5★ across 1,737 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.
Quality Score is 71: Strong (healthy traction). For a Utilities app, that means healthy traction. 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
$8.8K
per month
→
12-mo forecast
$9.1K – $19.0K
per month
→
24-mo forecast
$11.2K – $33.7K
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
11 snapshots on record
Rating
4.5
Reviews
1,737 reviews
Forecast Revenue / mo
$8.8K
Snapshots tracked
11
since Feb 2018
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
📈
Pays back in ~11 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 |
| ⚙ 9.2y maintenance × ~1-person team | +$54K |
Total estimate
$100K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$150K
↳ What it would sell for · not monthly revenue
Marketplace range $125K – $200K · 18× MRR multiple
💸
~1.5× build cost (break-even+)
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 |
| 📅 9.2y proven track record | +20% |
| ⭐ ★ rating ≥ 4.4 (solid) | +8% |
| 🏷 Utilities category multiple | -10% |
Final multiple
18× MRR
👥 Estimated audience size
240K
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 |
| 📅 9.2y of rating accumulation | -30% |
| 🔁 Utilities D30 retention | 20% |
| 📍 DAU / MAU stickiness | 0.20 |
DAU / MAU
20% sticky
🛠 Estimated tech stack
🍎
Native iOS (Swift / UIKit)
High confidence · 80%
Also possible
Native iOS (SwiftUI)
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 | 16 MB |
| 🏷 Category context | Utilities |
| 📦 Compact iOS bundle | → Native Swift / UIKit (pre-2020 era) |
💀 Maintenance status
Active
5%
Last shipped 2026-09-09 · 15 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
| 📅 15 days since last update | Active development |
Verdict
Active
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$8.8K/mo · ML-estimated from 234 triggers
Growth rate
+4.0% MoM · MID tier baseline (compound monthly)
6 months
$8.3K – $13.9K
12 months
$9.1K – $19.0K
24 months
$11.2K – $33.7K
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 · 49/100MID TIERunderperforming peersGrowth Velocity
5.0
Founder Strength
5.2
Product Quality
8.0
Revenue Strength
3.9
Monetization Maturity
1.0
Defensibility
4.3
Market Position
2.0
Operational Safety
10.0
- 💰 Revenue: Modest — $6K - $13K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.45★ across 1,737 reviews — strong (top 10%).
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: dev shipping weekly.
- ⚠️ 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 = $157K-$280K. 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 6 of 6 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 | |
| subscriptionREVIEW | +$2,500 | |
| Low install base (1,737 ratings)METRIC | +$1,500 | |
| Mature app (9y old)METRIC | +$1,500 | |
| Multilingual (10 languages)METRIC | +$1,500 | |
| Good rating (4.5★)METRIC | +$800 |
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 · v1.8.8
• Dark Mode implemented - automatically adapts to iOS system settings
• Revised app layout for clearer and more intuitive navigation
• Revised app layout for clearer and more intuitive navigation
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- tellows Caller ID & Blocker
- Developer
- Netzberater
- Bundle ID
- Not found
- App Store URL
- Open in App Store
- Category
- Utilities
- Content rating
- 9+
- Languages
- EN, FR, DE, ID, IT, JA, PT, RU, ES, SV
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
- $8.8K/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.
📈Ratings growth143 ratings+14200% lifetimeShow 3-year history estimate ▾
Tracked (11 weeks) Pre-tracking estimate (0 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.
🚀Update Frequency · Releases per Quarter2 releases tracked
🚀Version Release Timeline2 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
You are tired of annoying robo- & spamcalls and you want to stop the telephone harassment?
The tellows caller identification and spam protection makes it possible: Detect unknown calls while the phone is ringing, block unwanted phone calls and SMS spam. Also the app offers you to build your personal call blacklist, lookup for unknown phone numbers and rate callers. With tellows, you can finally feel safe again.
FEATURES OF THE APP
• Identification of unknown calls
• Spam lookup, robocalls, ping calls, advertising call,… View full description on the official store →
The tellows caller identification and spam protection makes it possible: Detect unknown calls while the phone is ringing, block unwanted phone calls and SMS spam. Also the app offers you to build your personal call blacklist, lookup for unknown phone numbers and rate callers. With tellows, you can finally feel safe again.
FEATURES OF THE APP
• Identification of unknown calls
• Spam lookup, robocalls, ping calls, advertising call,… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 16 MB🔞 9+📱 iOS 15.6+🔖 v1.8.8🔄 updated 2w ago🌐 EN, FR, DE, ID, IT +5📂 Utilities💰 Paid🚀 Launched 2017 (9y old)
📅
What Worked™ · Development Pipeline
10 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 →
2026-09
📸
Refreshed store screenshots — 5 of 5 updated
2026-09
🔧
Shipped update — v1.7.11 → v1.8.8
2026-05
🔄
Monetization changed: paid → free
2026-03
⭐
Rating ↑ 3.00 → 4.45 (improved 1.45★)
2026-03
📈
Crossed 10 ratings — social-proof flywheel kicking in
2025-11
⭐
Rating ↑ 2.60 → 3.00 (improved 0.40★)
2023-04
⭐
Rating ↑ 2.00 → 2.75 (improved 0.75★)
2022-03
⭐
Rating ↓ 2.50 → 2.00 (dropped 0.50★)
2020-10
⭐
Rating ↑ 2.00 → 2.50 (improved 0.50★)
2018-02
🚀
First tracked snapshot — initial data captured
📸
Store Page History
5 SCREENSHOT CHANGESEvery time a developer swaps a store screenshot we archive both versions. Compare side-by-side to see what messaging / visuals changed.
iPhone screenshots
Slot 1
2 ver.
2 ver.
2026-05-13
2026-09-13
Slot 2
2 ver.
2 ver.
2026-05-13
2026-09-13
Slot 3
2 ver.
2 ver.
2026-05-13
2026-09-13
Slot 4
2 ver.
2 ver.
2026-05-13
2026-09-13
Slot 5
2 ver.
2 ver.
2026-05-13
2026-09-13
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 4.5★ | 6 | 4.5★ this version |
| 🇧🇷 BR | 4.34109★ | 129 | 4.34109★ this version |
| 🇨🇦 CA | 4.66667★ | 3 | 4.66667★ this version |
| 🇩🇪 DE | 4.45038★ | 1,854 | 4.45038★ this version |
| 🇫🇷 FR | 4.36508★ | 126 | 4.36508★ this version |
| 🇬🇧 GB | 4.44681★ | 47 | 4.44681★ this version |
| 🇮🇳 IN | 5★ | 1 | 5★ this version |
| 🇯🇵 JP | 3.88235★ | 17 | 3.88235★ this version |
| 🇺🇸 US | 4.51748★ | 143 | 4.51748★ this version |
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for tellows Caller ID & Blocker: 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: 1,737 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
10 answers · auto-generated from this app's public dataHow much does tellows Caller ID & Blocker make per month?▴
Based on our ML-calibrated revenue forecast, tellows Caller ID & Blocker earns approximately $8.8K/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 tellows Caller ID & Blocker profitable?▴
With estimated build cost $100K and monthly revenue $8.8K, tellows Caller ID & Blocker looks profitable — pays back its estimated build cost in roughly 11 months at the current run-rate. Profitability also depends on paid-acquisition spend and refund rate which the public model doesn't see.
How many users does tellows Caller ID & Blocker have?▴
Estimated audience: ~240K lifetime downloads, ~27K monthly active users, and ~5K 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 tellows Caller ID & Blocker?▴
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 tellows Caller ID & Blocker built with?▴
Our heuristic places tellows Caller ID & Blocker on the Native iOS (Swift / UIKit) stack (High confidence, 80%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Native iOS (SwiftUI).
Is tellows Caller ID & Blocker still actively maintained?▴
Maintenance status: Active (5% abandonment risk). Last shipped version was 15 days ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
How much would tellows Caller ID & Blocker sell for?▴
Estimated acquisition value: $150K (marketplace range $125K – $200K). Calculated as 18× 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 tellows Caller ID & Blocker last updated?▴
tellows Caller ID & Blocker last shipped a new version on 2026-09-09 — less than a month ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes tellows Caller ID & Blocker?▴
tellows Caller ID & Blocker is published by Netzberater 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 tellows Caller ID & Blocker's BU Score?▴
tellows Caller ID & Blocker has a BU Score of 71/100 (Strong). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.