Official Publisher Site

App information and support, in one place.

Official app pages, privacy policies, support resources, and advertising verification for apps developed and published by J.KUN.

PrivacyHow each app handles data and third-party services
SupportFrequently asked questions and contact information
AdvertisingGoogle AdMob app-ads.txt availability

Apps

Apps with official information and support resources on this site.

Open Anything Viewer app icon

Open Anything Viewer

A read-only viewer for PDFs, HWP/HWPX, Office documents, eBooks, images, text, and common audio and video formats.

App infoPrivacySupport
Oddball Tuner app icon

Oddball Tuner

A chromatic tuner for iOS and Android with immediate pitch detection, a continuous meter, and a short pitch-history trail.

App infoPrivacySupport
Sign It Already app icon

Sign It Already!

Add signatures, stamps, and text to PDF, HWP, HWPX, and DOCX documents, then save or share the finished PDF.

App infoPrivacySupport
MIXDAY app icon

MIXDAY

Coordinate rehearsal dates by collecting each member's availability and surfacing the dates that work for the whole group.

App infoPrivacySupport

Publisher resources

app-ads.txt

Public Google AdMob inventory authorization file.

Open app-ads.txt

Contact

Support, privacy, and store-related inquiries are handled through one contact channel.

View contact information