Калькулятор 4 is an app by rRain in the Tools category, listed since at least June 2023. It has no native code, so it runs on any Android processor.
It asks for 3 permissions, none of them sensitive.
What's new in v1.8.3
➤Жестовой ввод функций по зажатию
➤Уменьшено количество кнопок клавиатуры и изменено их расположение
➤Некоторые слова на клавиатуре заменены векторными иконками
Description
From the listing uploaded by “appupdater”.
Simple and functional calculator
Highlights parentheses with color
Can wrap an expression in parentheses with one click or change the sign
Calculates on the go
You can write several functions in a row without parentheses, for example lglg10000000000 = 1
NEW in version 1.8.3:
➤Gesting input of clamping functions
➤Reduced number of keyboard buttons and changed their location
➤Some words on the keyboard are replaced with vector icons
NEW in version 1.8.2:
➤Minimum supported Android version increased to 5.0 Lollipop
➤No special changes, mostly code refactoring to make it easier to make changes later :)
➤New interface for resizing buttons
➤ Added launch screen
➤ Presets of settings in dialog boxes
➤New design settings
➤History moved to database
➤ Some themes have been improved
➤The result field is now fully clicked
NEW in version 1.8.1:
➤More themes
➤Undo Manager completed
➤ The function of wrapping in brackets has been completed
➤Added the function of changing the sign (I'll finish it later)
NEW in version 1.8.0:
➤Themes
➤Customizable result format (digit separators and E)
➤UNDO / REDO - undo / redo an action - remembers 100 changes
➤sgn - signum - returns the sign of a number (-1 or 0 or 1)
➤Improved API to 16, now supports android 4.1.1+
IT IS NECESSARY TO DELETE THESE APPLICATIONS to work or uninstall and reinstall
➤Horizontal scrolling response
➤Keyboard text size adjusts to buttons height
➤arc now return degrees if switch = deg
➤Wrap in parentheses button (press several times to place parentheses at a higher level. Press to parenthesize the expression in front of the cursor)
➤Added the ability to erase text by holding down a button
➤Changed expression processing logic:
for example now:
• √9 (9) = √ (9) × (9) = 27 but √9e = √ (9 × e)
• sinπcosπ = (sin (π)) × (cos (π)) but sin2πcosπ = (sin (2 × π)) × (cos (π))
• cos2π = cos (2 × π)
• 2 ^ 2e = 2 ^ (2e) but 2 ^ 2lg100 = 2 ^ 2 × lg100
• √lg10000 (1E5) = √ (log (10000)) × (1E5)
• lg4! 4 = lg (4!) × 4
• lg4! Lg100 = lg (4!) × lg100
In general, if the function argument is an implicit product (unsigned multiply) of numbers, then all numbers are included in the function argument
•••••••••
• 2³! = (2 ^ 3)!
• lg100³ = lg100 ^ 3 = (lg100) ^ 3
• lg100³! = (lg100³)!
➤ many more small visual changes and improvements
Security & authenticity
Security rating: Trusted
Signing certificate
Signature matches the Google Play versionChecked by the source store on Jun 26, 2026.
Certificate from Google Play App SigningGoogle keeps the signing key for the developer, so the certificate carries Google's name.
Store checks and file details
Developer signature verifiedJun 26, 2026
Validated against Google PlayJun 26, 2026
Signed byCN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US
Uploaded by “appupdater”Gold tier · 117,810 followers · uploading since 2020
Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.
Permissions (3)
Калькулятор 4 requests 3 permissions, none of them sensitive.
Full network accessandroid.permission.INTERNET
Prevent the device from sleepingandroid.permission.WAKE_LOCK
Can I install this APK over the version I already have?
Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.
Is the Калькулятор 4 APK safe?
No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. After downloading, check that the file's MD5 is b8c95034c99c408e291696cb90540e5e.