Concept render — production case on a Vizsla's collar
In development

Built for the collar they already wear.

We didn’t reinvent the collar. We built a sensor to seamlessly attach to it.

Join the early list

Hardware in development. Not yet for sale.

The Process

From movement
to meaning.

Four steps to understanding your dog's day. We capture the raw data, classify it on our servers, and check it against their unique normal.

01

Sense

6-axis motion sensor captures data at 26 Hz.

02

Sync

Background Bluetooth LE syncs data to your iPhone.

03

Analyse

Our neural net classifies sleep, walk, play, and eat.

04

Alert

We compare today to their baseline and flag the drift.

What it watches

Sleep

How long and when they rest.

Walk

How much they move.

Play

How active they are.

Eat

When and how long they eat.

Read Our Path

See how we built the neural net.

Industrial Design

A sealed case,
made for
wearables.

Our production enclosure is a sealed wearable case. A matte graphite shell, an orange sealing ring, and two strap lugs to mount directly to your dog’s current collar.

View the Build Log

Finished with the signature blue Fudini paw.

Concept render — production case
The Facts

Collar
specifications.

Honest hardware specs. No marketing fluff.

Sensors 6-axis motion (accelerometer + gyroscope).
Sampling 26 Hz, 2-second windows (52 samples).
Connectivity Bluetooth LE to iPhone.
Weight To be confirmed with the production case.
Water/Dust Not yet certified.
Charging Method in development.
GPS None. Will not find a lost dog.
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Specs subject to change before production.

Actual size

The size of
a matchbox.

50 × 41 × 15 mm. On a 25 mm collar it is about twice the strap's width. Drawn to scale next to things you already know.

fudini. FUDINI · 50 × 41 MM AIRTAG · 32 MM €2 COIN · 26 MM 25 MM COLLAR

Shown to scale with each other; the size on your screen depends on your display.

Roadmap

Where we
are today.

We are testing the prototype now. The enclosure is selected, the neural net is learning, and the app is live. Next up: finalising charging and securing certifications.

Follow the Progress

Subscribe to our build log.

Mar–Sep 2026

Core engineering, firmware pivots, and neural net training (documented in the Build Log).

App Live

iOS app launched with Breed ID, Food Matching, and AI Vet.

Next: Production Case

Finalising the physical enclosure and charging mechanism.

Next: Certification

Securing water/dust ratings and regulatory hardware certifications.

Transparency

Read our path.

We document the hard truths of building hardware in public. Read our engineering logs grouped by focus area.

Firmware & Battery

The LED that ate our battery 4 min Why we stopped using Zephyr on the XIAO nRF52840 4 min Native iOS background Bluetooth sync 4 min A fixed sampling interval saw 3.3% of the day 4 min

Hardware

Designing our first prototype case in Python 4 min

Machine Learning

Teaching a neural net what a dog eating looks like 5 min Moving activity classification off the collar 4 min

Data Honesty

By mistake, 47% of our calorie data was broken 5 min Our AI called 41 °C a good day for a walk 4 min
Hardware Questions

Details matter.

What you need to know about the Fudini collar.

Does it come with a collar strap?
No. It mounts securely to the collar your dog already wears using two strap lugs.
How heavy is it?
We are finalising the production case weight. It is designed to be highly lightweight and unobtrusive.
Can my dog swim with it?
Water and dust ratings are currently pending certification.
Does it work for cats?
The collar is built for dogs. Our models include a separate cat model for later.
Does it have Find My?
No. There is no location tracking technology inside Fudini.
How does it charge?
The final charging mechanism is currently in development.
Join the Early List

Free to join.

Denys Zarubin

Founder, Spain

Investors

Request the deck

Join the
early list.

Prototype phase. Not certified. Not for sale. No payment required.

You’re on the list. We’ll email you when the collar is ready. In the meantime, download the free Fudini app.