Report updated May 5, 2026
Call Blocker
For mobile users seeking protection from telemarketers, robocalls, and phone scams.
Call Blocker is a well-regarded utilities app that is available. With a 4.3/5 rating from 827K reviews, it maintains solid user satisfaction. Users particularly appreciate effective call blocking functionality provides immediate relief from unwanted spam and robo-call interruptions, though inconsistent blocking performance post-update allows spam calls to bypass filters and reach the user remains a common concern.
What is Call Blocker?
Call Blocker is a utility app for iOS and Android that identifies and blocks spam calls using a community-sourced database.
Users hire this app to reclaim their time from telemarketers and scams, prioritizing immediate, background-level protection over complex features.
Current Momentum
v3.0 · 5d ago
Maintenance- Shipped notification support for verified numbers.
- Fixed visual bugs in latest release.
Active Nemesis
Robokiller: Spam Call Blocker
By Mosaic S.r.l.
Other Rivals
7-Day Rank Pulse 🇺🇸
UtilitiesNo ranking data
Rating Pulse 🇺🇸
Recent User Mood
What makes this app unique?
What Does It Look Like?
What Are The Key Features?
Public database lookup for phone numbers to identify callers and report spam via community feedback
System-level integration to block incoming calls and identify commercial numbers on iOS and Android
Curated list of legitimate business and support numbers confirmed by internal moderation teams
Removes ad-supported limitations and provides unrestricted access to the full spam database
Pre-emptive blocking of up to 200,000 known dangerous phone numbers based on regional data
How much does it cost?
- Free version with ad-supported search
- Premium subscription at $7.99 monthly or $14.99 for 3 months
Subscription model anchored at $7.99/month, gating advanced security features and ad removal behind a recurring payment.
Who Built It?
Providing mobile users with tools to filter and block unwanted telemarketing and spam calls. Helping individuals regain control over their communication privacy.
Portfolio
2
Apps
What other apps does UnknownPhone.com make?
Call Blocker - Stop spam calls
Explore the full UnknownPhone.com report
Portfolio breakdown, audience, momentum, and every app published by UnknownPhone.com.
What do users think recently?
High confidence · 99 reviews analyzed · Based on 99 reviews. Signal may be noisy.
How did the latest release land?
What is the recent mood?
Recent user voice shows a excited sentiment. Users appreciate effective call blocking functionality provides immediate relief from unwanted spam and robo-call interruptions and background operation ensures consistent protection without requiring active user management during daily phone usage, but report inconsistent blocking performance post-update allows spam calls to bypass filters and reach the user and premium subscription features fail to activate or function correctly after purchase on mobile devices.
What Users Love
What Frustrates Users
What Users Want
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Call Blocker?
How's The Utilities Market?
How does it evolve in the Utilities market?
Call Blocker maintains a stable utility presence with a 4.4 average rating across 827,034 total ratings, though it faces stiff competition from automated alternatives.
Rank progression
131 active rankings tracked — 30-day window
The rivals identified
Nemeses(1)
Robokiller is the direct thematic equivalent, focusing specifically on spam call interception and caller identification with a high-velocity release cadence.
Differentiators
- Utilizes proprietary audio-fingerprinting technology to intercept and answer spam calls with automated bots
- Provides a gamified experience by allowing users to listen to recorded spammer interactions
- Maintains a massive, crowd-sourced database of blacklisted numbers updated in real-time by millions of users
Head to head
Robokiller dominates through aggressive automation and entertainment-based engagement; the target app must pivot toward superior UX simplicity or integrate automated response features to remain competitive.
Contenders(2)
A legacy player in the caller ID space with deep integration into carrier-level spam protection services.
Differentiators
- Provides carrier-grade spam protection APIs that are often pre-installed on major mobile network devices
- Focuses on enterprise-level reputation management for business calls to ensure legitimate calls are not blocked
A massive global competitor in the caller identification space that leverages social network effects for number tagging.
Differentiators
- Integrates social tagging features where users can see how their number is saved in others' contact lists
- Operates as a global communication platform rather than just a utility tool for blocking spam
Compare Call Blocker against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for Call Blocker
Strengths to defend, gaps to attack
Core Strengths
- 10M-number database provides deep spam-detection coverage
- System-level integration ensures reliable background blocking
Critical Frictions
- Manual database refresh requirement creates unnecessary friction
- Subscription activation errors erode premium-tier trust
Growth Levers
- SMS spam filtering integration addresses top-requested user gap
- Automated database sync would reduce churn
Market Threats
- Robokiller’s AI-driven call-answering bots set new defense standard
- Carrier-level pre-installs marginalize third-party utilities
What are the next best moves?
Automate database synchronization because manual refresh is a top-cited usability gap → increase daily active usage
User complaints highlight manual updates as a significant friction point.
Trade-off: Deprioritize the UI visual polish sprint to focus engineering on background sync logic.
Audit subscription validation logic because activation errors are reported by premium users → reduce refund surge
Premium users report being locked out of paid features, directly impacting revenue.
Trade-off: Pause new feature development for one cycle to stabilize core revenue infrastructure.
Ship SMS spam filtering because it is the top-requested feature → expand market share
Sentiment analysis shows explicit user demand for expanded communication protection.
Trade-off: Delay the planned expansion of the international number directory to Q3.
A counter-intuitive read
The app's reliance on manual database updates is a strategic vulnerability, but it also serves as a low-cost, high-trust signal for privacy-conscious users who prefer local control over cloud-synced AI.
Feature Gaps vs Competitors
- AI-driven automated call-answering bots (available in Robokiller)
- SMS spam filtering (requested by users, missing here)
Key Takeaways
Call Blocker succeeds by providing reliable core blocking, but its manual update requirement and subscription bugs threaten retention, so the team must prioritize automation and stability to defend against AI-driven rivals.
Where Is It Heading?
Mixed Signals
The spam-blocking market is shifting toward automated, AI-driven defense, leaving manual-update apps like Call Blocker increasingly exposed. To remain competitive, the app must transition from a static directory to an active, automated security layer, or risk losing its user base to more responsive, high-velocity rivals.
Inconsistent blocking performance in the latest release allows spam to reach users, which erodes trust in the core utility.
High user demand for SMS filtering indicates a clear path to expand the premium value proposition into new communication channels.