Blue Comet Labs

Blue Comet Labs is a software development company based in Osaka, Japan. We specialize in developing iOS & macOS applications that deliver unique value, experiences, and delight to people around the world. If you have any questions, feel free to contact us.

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We’re currently working on the following apps:


Free In-App Purchase iPhone Mac

Expenses has been crafted to keep track of your spending effortlessly, with useful features in a simple, intuitive interface.

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Released on May 14, 2020


Free In-App Purchase iPhone Mac

A simple process-oriented checklist app that helps you ensure you don't forget anything.

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Released on May 14, 2022


Paid iPhone Watch Mac

8Planets is a simple viewer and simulator for planetary orbits in our Solar System.

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Released on March 22, 2021


Paid iPhone Mac

PasswordGen is a tiny app that will allow you to create a strong password quickly and easily.

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Released on December 11, 2021


Free In-App Purchase iPhone Watch

OnDrip is an app that calculates the drip rate of an IV and simplifies drip adjustment through vibration.

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Released on May 2, 2024


Free Mac

Rokuyo is a simple menu bar app that will let you know about today's Rokuyo (六曜).

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Released on October 14, 2021