Written in Kittine — this page is compiled Kittine (.kitty) source by Sivario Buchanan and BuildsByBuchanan, not React or Next.js.

We build mobile apps, games, and software.

Appxcel is a South African studio founded and engineered by Sivario Buchanan. Everything we release — apps, games, and the software in between — lives in one place: the Appxcel Store.

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Our Apps

A digital math and algorithms notebook — live LaTeX, real graphing, a working code lab, and a Knowledge Center that explains everything.

A faster, more private period and ovulation tracker, with adaptive predictions and an AI assistant that actually knows your data.

Every app we build, in one place — download Monthlys or Algo Me for Android, or add them to your home screen on iPhone.

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Why Appxcel

Founded and engineered by Sivario Buchanan

Sivario Buchanan is the founder, CEO, and CTO of Appxcel — a South African studio building mobile apps, games, and software without the bloat. Monthlys, our first release, was built carefully and shipped honestly, with the Appxcel Store as the one place to get everything we make.

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Who We Work With

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Engineering Partner

BuildsByBuchanan

Sivario Buchanan's engineering studio, handling infrastructure and deployment for Appxcel.

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This site is written in Kittine

Kittine

The language built by Sivario Buchanan and BuildsByBuchanan. Appxcel is compiled Kittine (.kitty) source — real Rust and Leptos underneath, not React or Next.js.

Visit Kittine →