About NKIS Works
NKIS Works is independently operated in Japan. I develop apps and web tools for playlist organization, record-keeping, and other specific tasks.
What I build
Playlist Toolkit helps with Amazon Music playlist organization on Android: remembering display order, checking possible duplicates, and reviewing long playlists. The product pages show the features, supported workflows, and limitations.
Before you use it
Changing the displayed order is not the same as changing the track order saved in Amazon Music. The guides explain that difference and the steps involved. Compatibility, pricing, and data handling are listed on the product pages.
Questions and feedback
I handle development and this website myself. Questions, bug reports, and feature requests are welcome at the address below. I cannot promise an immediate reply; please include the product and the steps you need help with.
Get in touch
For product issues, include the product, device, OS, and steps to reproduce. Do not send passwords or screenshots containing personal data. Japanese product sales information: Seller information (Japanese)