Best 4Us Apps

200+ iOS apps curated and reviewed

3.3 avg rating
6 free apps
Updated June 2026

The best 4us apps on iPhone average 3.3β˜… across 200+ titles β€” we've ranked them by what real users actually keep on their phones. Updated June 2026.

Top Picks for 4Us

4Us App#1

4Us App by Joshua Coach

Editor's Choice
🌐 Social Networking
5.0(6 ratings)
Free
4Us App screenshot 1
4Us App screenshot 2
4Us App screenshot 3

Discover and connect with local events and activities tailored to your interests. Engage with like-minded individuals, RSVP effortlessly, and share your experiences through media. This platform helps you find social gatherings, networking opportunities, and meetups.

Aspect Ratio X Calc#2

Aspect Ratio X Calc by 4us

A : B = C : X To find X
Strong Contender
πŸ”§ Utilities
5.0(3 ratings)
Free
Aspect Ratio X Calc screenshot 1
Aspect Ratio X Calc screenshot 2

This utility calculates unknown values in aspect ratios, useful for resizing images and clipping. It simplifies the process of determining proportional dimensions for various visual applications.

More 4Us apps to explore

4
K4us French Keyboard
K4us French Keyboard
K4us French Keyboard
with Arrow Keys, AEI Keyboard
$0.99
πŸ”§ Utilities
(0)
5
Easy URL Keyboard
Easy URL Keyboard
Easy URL Keyboard
Arrow Keys!!
Free

Enhance your typing experience with a QWERTY keyboard featuring dedicated arrow keys and shortcuts for common URL components. Streamline text editing and URL input with specialized keys and auto-saving of typed URLs.

Arrow keys for precise caret movementDedicated keys for "http://" and "www"Expanded keys in landscape mode
πŸ”§ Utilities
(2)
free
6
K4us Danish Keyboard
K4us Danish Keyboard
K4us Danish Keyboard
with Arrow keys
$0.99
πŸ”§ Utilities
(0)
7
2 Field % Calc
2 Field % Calc
2 Field % Calc
For Searching how big or small
Free

Calculate percentages between two numbers for various uses, including resizing images and determining magnification. Ideal for DTP and web designers needing quick calculations.

Calculate percent between two numbersImage resizing by percentageMagnification calculation
πŸ”§ Utilities
(1)
free
8
K4us Spanish Keyboard
K4us Spanish Keyboard
K4us Spanish Keyboard
with Arrow Keys
$0.99

This keyboard app offers a streamlined way to type Spanish characters, including vowels, consonants, and special symbols like ΒΏ and Β‘. It features word prediction and arrow keys for enhanced navigation on iOS devices.

Easy input of Spanish charactersWord predictionArrow keys for navigation
πŸ”§ Utilities
(1)
paid
9
AEI Keyboard URL Note
AEI Keyboard URL Note
AEI Keyboard URL Note
Original Keyboard
Free

This utility app provides a specialized keyboard designed for faster and easier input of URLs and text. It features adjustable key sizes, arrow keys for precise editing, and custom keys for common web domains. A 'Go' button allows direct browsing within the app.

Ideal key size for fewer errorsArrow keys for precise caret movementCustom keys for common web domains
πŸ”§ Utilities
(1)
free
10
K4us Italian Keyboard
K4us Italian Keyboard
K4us Italian Keyboard
with Arrow Keys
$0.99
πŸ”§ Utilities
(0)
11
K4us German Keyboard
K4us German Keyboard
K4us German Keyboard
with Arrow Keys, AEI Keyboard
$0.99
πŸ”§ Utilities
(0)
12
Easy Mailer Spanish Keyboard
Easy Mailer Spanish Keyboard
Easy Mailer Spanish Keyboard
With Arrow Keys
$0.99

Enhance your Spanish typing experience on iPhone with extended keys, including arrow keys for precise text editing and dedicated keys for special characters. Features Spanish word prediction and auto-determination of marks for faster input.

Arrow keys for caret navigationDedicated keys for extended charactersSpanish word prediction
πŸ”§ Utilities
(1)
paid
13
Easy Mailer Russian Keyboard
Easy Mailer Russian Keyboard
Easy Mailer Russian Keyboard
by 4us
$0.99

Enhance your Russian typing experience on iPhone and iPod Touch with extended keys for faster messaging. Features include arrow keys for precise editing, dedicated keys for special characters, and word prediction.

Arrow keys for caret movementDedicated keys for special charactersRussian word prediction
πŸ”§ Utilities
(2)
paid
14
Easy Mailer Japanese Keyboard
Easy Mailer Japanese Keyboard
Easy Mailer Japanese Keyboard
Nice to use Arrow Keys
$0.99

Enhance your iPhone's Japanese typing experience with extended keys and arrow controls for faster editing. Features English word prediction and auto-determination of marks for efficient text input.

Extended keys for Japanese charactersArrow keys for caret navigationEnglish word prediction
πŸ”§ Utilities
(1)
paid
15
K4us Rumanian Keyboard
K4us Rumanian Keyboard
K4us Rumanian Keyboard
with Arrow Keys
$0.99
πŸ”§ Utilities
(0)
16
K4us Portuguese Keyboard
K4us Portuguese Keyboard
K4us Portuguese Keyboard
with Arrow Keys, AEI Keyboard
$0.99
πŸ”§ Utilities
(0)
17
K4us Dutch Keyboard
K4us Dutch Keyboard
K4us Dutch Keyboard
with Arrow Keys
$0.99
πŸ”§ Utilities
(0)
18
AEI Keyboard Note French
AEI Keyboard Note French
AEI Keyboard Note French
Original Keyboard
Free

This keyboard app is designed for faster, one-handed typing with unique multi-input keys and dedicated buttons for French characters. It offers features like arrow keys for editing and auto-saving messages.

One-push vowel inputTwo-push alphabet inputDedicated French character keys
πŸ”§ Utilities
(1)
free
19
K4us English Keyboard
K4us English Keyboard
K4us English Keyboard
with Arrow Keys
$0.99

This keyboard app offers enhanced typing efficiency for iPhone and iPad users with features like arrow keys and a unique vowel input system. It aims to speed up text entry, especially for two-thumb typing, and includes customizable sound settings.

Arrow keys for precise cursor controlEfficient vowel and alphabet inputOptimized for two-thumb typing
πŸ”§ Utilities
(2)
paid
20
Easy Mailer Korean Keyboard
Easy Mailer Korean Keyboard
Easy Mailer Korean Keyboard
with Arrow Keys
$0.99

This application enhances the Korean keyboard on iPhone/iPod devices, allowing users to type messages more easily and quickly with additional features such as arrow keys and dedicated keys for extended characters. With its special features, including auto-determination of marks and multi-input keys, users can efficiently edit and compose text, making it a valuable tool for those who frequently type in Korean.

πŸ”§ Utilities
(3)

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