Independent software studio · St. Petersburg, Florida

Software built carefully, one product at a time.

GJU Software LLC designs, develops, and maintains web and mobile applications, including our own apps for airline crews on the App Store and Google Play.

Florida limited liability company Established September 2026 Founder-led

Products

Two products for pilots and crews.

Both are built in-house. Crosscheck is live on the web, with apps for iPhone, iPad and Android to follow. Crosscheck Duty, our duty and rest calculator for airline crews, is coming to the App Store and Google Play. Store links will be published here ahead of each app release.

Crosscheck

Live

An FAA medical tracker and free FAA tools for pilots. Check a medication or a condition against the FAA's own documents, find an aviation medical examiner, and keep your medical dates, doctor visits, medications and documents in one place, encrypted and ready for MedXPress. Every answer names its FAA source and date. Crosscheck does not predict whether you will be issued a certificate, give medical advice, or speak for the FAA, and it is not affiliated with the FAA.

Platforms: Web; iPhone, iPad and Android apps to follow
Plans: Free FAA tools; Crosscheck Plus and Pro
Website: crosscheckmed.com
Publisher: GJU Software LLC

Crosscheck Duty

Coming soon

A duty and rest calculator for US airline crews. Crosscheck Duty calculates the federal flight-duty and rest limits for Part 121 passenger airline pilots under 14 CFR Part 117 and for flight attendants under 14 CFR §121.467. It is an informational tool and does not replace the regulations, company procedures or crew scheduling. It does not cover all-cargo, Part 135 or Part 91 operations.

Platforms: iPhone, iPad, Android
Availability: App Store and Google Play, as Crosscheck Duty & Rest
Help: Support · Privacy policy · Terms of Use
Publisher: GJU Software LLC

Services

Custom software, end to end.

Alongside our own products, we take on custom development work for web and mobile, covering the full lifecycle of an application.

Design

Application design

Scoping, user flows, and interface design grounded in how the software will actually be used.

Build

Programming

Web and mobile development, including software-as-a-service products developed and operated by the studio.

Ship

Deployment

Release to the web, the App Store, and Google Play, with hosting and infrastructure set up to match.

Maintain

Ongoing maintenance

Updates, monitoring, and support after launch so the software keeps working as platforms change.

Questions about our apps, or interested in working together? Reach the studio directly by email.