Products / Works

Apps developed and operated by NinjaSystem. We plan, design, implement, release, and improve lightweight utility apps for everyday and work use.

🧮

Product / Work

Calclab

A utility app for everyday and work-related calculations, showing estimates based on your input conditions.

Development area Mobile app / Flutter / Android / iOS / LP / Store release

Scope Planning, UI design, implementation, store release, policy pages, and post-release improvement

Technology Flutter, Firebase, Astro, Cloudflare Pages

Design focus Category-based everyday calculations with clear reference results while editing inputs

View product page Consult about a similar app

Download on the App Store GET IT ON Google Play

🛡️

Product / Work

QR Guard

A utility app that helps you review QR codes and links before opening them. It does not guarantee complete safety judgments.

Development area Mobile app / QR code review / Android / iOS / LP / Store release

Scope Planning, UI design, implementation, store release, support and policy pages, and improvement

Technology Flutter, Firebase, Astro, Cloudflare Pages

Design focus Pre-open link review support with conservative safety wording and clear user responsibility

View product page Consult about a similar app

Download on the App Store GET IT ON Google Play

🧳

Product / Work

Tabijitaku

Tabijitaku is a simple travel prep notes app for organizing packing lists, plans, budgets, reservation checks, and notes.

Development area Mobile app / Travel prep notes / Flutter / Android / iOS / LP / Store release

Scope Planning, UI design, implementation, store release, privacy and terms pages, and improvement

Technology Flutter, Firebase Analytics / Crashlytics, Astro, Cloudflare Pages

Design focus Local-first organization for packing, plans, budgets, and reservation checks by trip

View product page Consult about a similar app

Download on the App Store GET IT ON Google Play

⏱️

Product / Work

GlassWatch

World clock, timers, stopwatch, focus sessions, alarms, widgets, and settings in one time management app.

Development area Mobile app / Time management / Flutter / Android / iOS / Widgets / LP

Scope Planning, UI design, implementation, notification and widget design, privacy and terms pages

Technology Flutter, Firebase Analytics / Crashlytics, Astro, Cloudflare Pages

Design focus A calm everyday time workspace for clocks, world clocks, timers, focus sessions, and alarms

View product page Consult about a similar app

COMING SOON Store release in preparation

📚

Product / Work

Hirari

Hirari is a book discovery app that helps users find daily reading candidates using book information from Rakuten Books.

Development area Mobile app / Book discovery / Flutter / Android / iOS / API / LP

Scope Planning, UI design, implementation, recommendation API design, privacy and terms pages

Technology Flutter, Cloudflare Workers / KV, Rakuten Books API, Firebase Analytics / Crashlytics

Design focus Server-prepared candidate books combined with local app state for daily reading suggestions

View product page Consult about a similar app

COMING SOON Store release in preparation

We use our in-house product experience to support app and web service development.

Consultations are welcome for small-start apps, business automation tools, and MVP development.

Consult about development