Call Blocker vs ESP Alexa
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Call Blocker
Block unwanted calls, identify suspicious numbers, and report spam. Access a large community database to avoid phone scams and extra charges. Protect yourself from telemarketers and unknown callers.
- Block any phone number
- Identify commercial calls
- Report suspicious numbers
- Avoid common scams
- Access community database
- Automatic dangerous number blocking
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Protect your iPhone from spam calls with Call Blocker. Enable automatic protection to identify and block calls from numbers on our spam protection list, which we update as new threats are detected. Find out who called you, check suspicious numbers, and take control of unwanted calls. AUTOMATIC SPAM CALL PROTECTION Call Blocker helps protect your phone from unwanted telemarketing calls and potential phone scams. With protection enabled, your iPhone identifies and blocks calls from numbers included in the protection list. Your protection list updates automatically to include newly detected spam numbers. WHO CALLED ME? Look up a phone number before calling back. Check available information from UnknownPhone.com to see whether a number has been associated with telemarketing, unwanted calls, or potential scams, and read other users' reports. BLOCK UNWANTED CALLS Alongside spam protection, add individual numbers to your personal block list. Choose which numbers to block and manage your list in the app. REPORT SUSPICIOUS NUMBERS Received a suspicious call? Report the number and share what happened. Your feedback helps us identify new suspicious numbers and improve our protection. MORE PROTECTION WITH AN OPTIONAL SUBSCRIPTION • Access to the full database of dangerous numbers available for your country. • Automatic updates to your protection list. • Automatic identification and blocking of numbers included in the protection list. • Unlimited credits and unrestricted access to available lookup results. • An ad-free experience. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
ESP Alexa
This SDK enables developers to integrate Amazon's Alexa Voice Service and Google Voice Assistant into ESP32 microcontroller-based devices. It's designed for evaluating voice assistant integrations in smart speakers and IoT products.
- Alexa Voice Service integration
- Google Voice Assistant integration
- Dialogflow conversational interface
- ESP32 microcontroller support
- IoT device integration
- Voice assistant evaluation
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The ESP-Voice-Assistant SDK provides an implementation of Amazon's Alexa Voice Service, Google Voice Assistant and Google's conversational interface (aka Dialogflow) for ESP32 microcontroller. This facilitates the developers to evaluate ESP32 based voice assistant/s integrated devices like speakers and IoT devices. https://github.com/espressif/esp-va-sdk
Screenshots
Verdict
The clearest difference is review sentiment: Call Blocker at 78% against ESP Alexa's 33%. Call Blocker also leads on rating (4.5 vs 2.3) and ratings volume (1.2K vs 3). ESP Alexa's advantage is in-app purchases (none vs 10) and ads (none vs shown). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Call Blocker sells 10 in-app purchases, starting at $4.99 per month. ESP Alexa asks for nothing beyond the download.
Call Blocker holds the better App Store score, 4.5 against 2.3. That said, the two scores are not equally well evidenced: Call Blocker has 1.2K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 78% of Call Blocker's written reviews are positive against 33% of ESP Alexa's.
Call Blocker ships an update monthly, ESP Alexa every 2 months. Both last shipped on October 24, 2026.
| Parameter | Call Blocker | ESP Alexa |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (1.2K ratings) — better | 2.3 (3 ratings) |
| Positive reviews | 78.2% of reviews — better | 33.3% of reviews |
| Number of ratings | 1.2K — better | 3 |
| Update frequency | Monthly — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 72 MB | 14 MB |
| Age rating | 9+ | 4+ |
| Developer | UnknownPhone.com | ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD. |
Customer experience
Call Blocker
ESP Alexa
Bugs and requests
Call Blocker
Reported bugs
2 issues- Database update errors
- Inability to block certain numbers
Requested features
3 requests- Automatic database updates
- Block calls from unknown/private numbers
- Integration with phone's native call blocking
ESP Alexa
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Call Blocker
- Call Blocker 1-Month Shield$4.991 Month
- One month subscription$6.991 Month
- Call Blocker: 3M Shield$9.993 Months
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- Free 1 week trial + 3 months7 Days trial$9.993 Months
- 50% Discount - Three months3 Months trial$9.993 Months
- Three months subscription$14.993 Months
- Free 1 week trial + 3 months7 Days trial$14.993 Months
- Call Blocker: 1 Year$22.991 Year
- Call Blocker: 1 Year - 1 Free Week7 Days trial$22.991 Year
- Call Blocker: 1 Year (50% Discount)1 Year trial$22.991 Year
ESP Alexa
No in-app purchases
Questions
Is Call Blocker free?
Is ESP Alexa free?
Which has better reviews, Call Blocker or ESP Alexa?
Do Call Blocker or ESP Alexa have ads?
Which is updated more often, Call Blocker or ESP Alexa?
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