Knowcall: Caller ID & Block Android
49 days old
Knowcall: Caller ID & Block is #107 in Communication Free on Google Play in Brazil and charting in 2 of 23 countries we track.
Updated 24 Oct 2026 · rankings refresh through the day
DeveloperMinh Tam Nguyen
CategoryCommunication
PriceFree
Released
Installs5k+
Rating–
Updated–
Content ratingEveryone
Best rank now
#107
Communication FreeMeasured
Knowcall: Caller ID & Block on Google Play
App details
App ID
com.tranquilmind.knowcall.caller
Publisher
Nguyễn Minh Tâm
Publisher country
Vietnam
Content rating
Everyone
Knowcall: Caller ID & Block downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Business model: Ad-led
How Knowcall: Caller ID & Block makes money: subscriptions, one-off purchases and ads.
Ads · 8 ad networks
Ads
/mo
of revenue
Where it ranks on Google Play
Every top 200 chart it appears in across 23 countries.
| Country | Charts | Rank |
|---|---|---|
| Brazil | CommunicationFree | #107 |
 South Korea | CommunicationFree | #184 |
Apps near Knowcall: Caller ID & Block on the chart
Communication Free, around #107.
Samsung Accessory Service#102
Click to Chat - Without Saving#103
Phone - Call & Contacts#104
Messages - SMS Text Messaging#105
Romantic Stickers - WAStickers#106
Stickers and emoji - WASticker#108
Messages : SMS & Private Chat#109
MT Cidadão#110
Azar: Video Chat, Meet Friends#111
Whoscall: Caller ID & Block#112
About Knowcall: Caller ID & Block
Knowcall shows you who is calling, keeps the numbers you never want to hear from out of your day, and collects the message notifications that arrived while you were away.
Set Knowcall as your default Caller ID and spam app and it can silence or reject calls from the numbers on your own spam and block lists. Your contacts, your lists and your unseen messages stay in storage on the device.
KEY FEATURES
- Caller ID from your contacts: incoming and searched numbers are matched against your address book, so a saved number shows a name instead of digits.
- Number lookup: type any number in the Tracker tab to check whether it is in your contacts, and keep a history of the numbers you looked up.
- Spam list and block list: add numbers yourself; the call screening service silences or rejects them once you set Knowcall as the default Caller ID and spam app.
- Unseen messages: with notification access granted, Knowcall records message notifications from chat apps, so you can read what arrived even after the sender removes it, and filter the log by app.
- Contacts and favorites: browse your address book, mark the people you call often, and dial straight from the app.
- Themes: switch the whole app between colour themes.
- 21 languages, selectable on first launch and from Settings.
WHO IT IS FOR
People who get calls from numbers they do not recognise, who want a simple list of numbers to silence, and who want a record of the chat notifications they missed.
FREE AND AD SUPPORTED
- Knowcall is free to download and free to use.
- The app is supported by advertising: banner, native, interstitial and app-open formats.
- In the European Economic Area and the United Kingdom you are asked for advertising consent on first launch, and you can change that choice later.
PERMISSIONS AND WHY
- Contacts: to match incoming and searched numbers against your address book.
- Phone: to place a call when you tap a number inside the app.
- Notification access: to list message notifications in the Unseen tab.
- Notifications: to deliver the app's own reminders.
- Battery optimisation exemption: optional, so screening and the message log keep working in the background.
Knowcall does not request SMS or call log permissions.
DISCLAIMER
- Knowcall identifies callers using the contacts saved on your device and the spam and block lists you create yourself. It does not query an online directory of phone numbers and cannot name a number you have never saved.
- Your contacts, your spam and block lists, your lookup history and your logged message notifications are stored on the device. Knowcall does not upload them to a server.
- Call screening needs Android 10 or newer, and needs you to set Knowcall as the default Caller ID and spam app in system settings.
- Reading message notifications needs notification access, which you grant in system settings and can withdraw at any time.
- By using this app, you agree to our Terms of Service (https://policy.tranquilmind.co/knowcall/terms)
Set Knowcall as your default Caller ID and spam app and it can silence or reject calls from the numbers on your own spam and block lists. Your contacts, your lists and your unseen messages stay in storage on the device.
KEY FEATURES
- Caller ID from your contacts: incoming and searched numbers are matched against your address book, so a saved number shows a name instead of digits.
- Number lookup: type any number in the Tracker tab to check whether it is in your contacts, and keep a history of the numbers you looked up.
- Spam list and block list: add numbers yourself; the call screening service silences or rejects them once you set Knowcall as the default Caller ID and spam app.
- Unseen messages: with notification access granted, Knowcall records message notifications from chat apps, so you can read what arrived even after the sender removes it, and filter the log by app.
- Contacts and favorites: browse your address book, mark the people you call often, and dial straight from the app.
- Themes: switch the whole app between colour themes.
- 21 languages, selectable on first launch and from Settings.
WHO IT IS FOR
People who get calls from numbers they do not recognise, who want a simple list of numbers to silence, and who want a record of the chat notifications they missed.
FREE AND AD SUPPORTED
- Knowcall is free to download and free to use.
- The app is supported by advertising: banner, native, interstitial and app-open formats.
- In the European Economic Area and the United Kingdom you are asked for advertising consent on first launch, and you can change that choice later.
PERMISSIONS AND WHY
- Contacts: to match incoming and searched numbers against your address book.
- Phone: to place a call when you tap a number inside the app.
- Notification access: to list message notifications in the Unseen tab.
- Notifications: to deliver the app's own reminders.
- Battery optimisation exemption: optional, so screening and the message log keep working in the background.
Knowcall does not request SMS or call log permissions.
DISCLAIMER
- Knowcall identifies callers using the contacts saved on your device and the spam and block lists you create yourself. It does not query an online directory of phone numbers and cannot name a number you have never saved.
- Your contacts, your spam and block lists, your lookup history and your logged message notifications are stored on the device. Knowcall does not upload them to a server.
- Call screening needs Android 10 or newer, and needs you to set Knowcall as the default Caller ID and spam app in system settings.
- Reading message notifications needs notification access, which you grant in system settings and can withdraw at any time.
- By using this app, you agree to our Terms of Service (https://policy.tranquilmind.co/knowcall/terms)