Sylvester Digital

Software with purpose.

We craft focused, elegant digital tools built for real people and designed to last.

Our products About us

The name Sylvester comes from the Latin silva, "of the forest." We build with the same patience and intention nature does.

Our story

What we build

Our products.

Focused, private Android apps built to track the things that matter to you.

Android app

Vitals

Track blood pressure, heart rate, and blood oxygen saturation with a clean, simple Android app focused on clarity and ease of use.

Log readings, review your history with notes, and export your data in the format that suits your healthcare provider. No subscriptions. No complexity.

Learn more

Android app · Coming soon

Tiddle

Log fluid intake and output (urine and bowel) with optional volumes and notes. A clear, private record to share with your clinical team when you need to.

Built for people managing fluid restrictions, recovering from surgery, caring for a loved one, or anyone whose doctor has asked them to keep a record.

Learn more

Android app · Coming soon

Luma

Simple, private cycle tracking for Android. Log your periods, see your fertile window, and understand your cycle at a glance.

A clean cycle wheel, monthly calendar view, and phase tracker. No accounts, no cloud, no data leaving your device.

Learn more All products

Our approach

We build fewer things, better.

Intentional design

Every element earns its place. We remove friction, not features that matter.

Privacy first

Your data stays on your device. We never sell information or track behaviour.

Fast & reliable

No bloat, no unnecessary dependencies. Software that does what it says, every time.

People at the centre

We listen. Our tools are shaped by real user needs, not engineering convenience.

Latest

From the studio

All news

29 April 2026

Announcing Luma: simple cycle tracking for Android

We're building Luma, our third Android app. A clean, focused cycle tracker for anyone who wants to understand their menstrual cycle without the noise or privacy compromises.

1 April 2026

Announcing Tiddle: fluid balance tracking for Android

We're building Tiddle, our second Android app. A clean, focused fluid tracking tool for anyone who needs to monitor intake and output. No accounts, no data leaving your device.

29 March 2026

Announcing Vitals: track what matters

We're building Vitals, our first Android app. A clean, focused health tracking tool for anyone who needs to monitor blood pressure, heart rate, or oxygen saturation.

Get in touch

Have a question or idea? We'd love to hear from you.

Whether you're interested in Vitals, have feedback, or just want to say hello, our door is always open.