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Citronics — Circular electronics

Build smart products carrying a story worth telling.

Our technology turns retired smartphones into pocket-size computers at scale.

See how it works ↓

Get the story

Test it ↗

Get a prototyping board

The story

Imagine your next smart product, powered by retired smartphone elements.

Smartphone processors don't get weak as they age. They get mismatched to mobile usage while staying a strong fit for industrial products. Our technology repurposes retired smartphones elements into industrial-grade, pocket-size computers.

Benefits

Your edge is built in,
not added on.

Circular by origin, competitive by design.

Conventional electronics were designed for a world of cheap silicon and stable supply. That world changed. We build on hardware that already exists, turning conventional electronics' instability into your product's advantage.

  1. Unique
    performance-to-cost
    ratio

    At least 20% cheaper at scale

  2. Reduce supply risks

    15 000+ units in stock today,
    150 000+ tomorrow

  3. Improve impact

    -50% CO2 eq. on manufacturing

Markets

One technology, proven across cities, industries, and buildings.

Different sectors, same technology.
Find where yours fits.

Browse the use cases and find the one closest to yours.

Reliability

Reused electronics. Rigorously proven.

We don't hope it holds up.
We prove it does.

For us, every device is faulty until proven. A tested sample reveals how these components age, and those criteria screen every unit we ship.

Rack of Citronics boards under test, lit in blue

Developers

A modular approach to circular embedded systems

You design for your application.
We power it.

  • Compute module (CiSoM)

    Standardized compute and connectivity, repurposed at scale.

    Multi-core CPU, GPU, 4G/LTE, WiFi, BLE, USB.

    Circular System-on-Module
    +
  • Carrier board

    Application-specific power, control, and interfaces.

    USB, Ethernet, CAN, SPI, I²C, UART.

    The Limeboard carrier board on a grey seamless, its connectors along the bottom edge and the CiSoM bay empty
    =
  • Embedded edge computer

    A deployable computer, ready for your application.

    Linux-powered: Ubuntu, Debian, Buildroot.

    Embedded edge computer

Supply

We love piles of old smartphones

We pay above scrap for the phones no one else wants.

Retired smartphones get usually shredded for their metals. We keep the computer inside instead, still working, still worth far more. We buy in volume and pay for it, so every phone gets a lower-impact second life.

A pile of old smartphones

Impact

Impact built-in, not bolted on

We make an unusual difference.
Your business will notice.

  • Local

    A local loop, built to replicate

    Sourced and reused in Europe today, and beyond over time.

  • Inclusive

    Repurposed by people often left out of work

    People with disabilities, and others returning to the job market.

  • Low-carbon

    ~18kg CO2 eq. saved

    Per device, manufacturing-phase, vs. conventional.

Seen in

  • RTL Belgium
  • WIRED
  • De Standaard
  • Le Soir
  • Hackaday
  • La Libre Belgique
  • Hacker News
  • RTBF
  • L'Echo
  • RTS
  • RTL Belgium
  • WIRED
  • De Standaard
  • Le Soir
  • Hackaday
  • La Libre Belgique
  • Hacker News
  • RTBF
  • L'Echo
  • RTS

Supported by

  • Circular Wallonia
  • Innoviris
  • Wallonie Relance
  • Disctrict Cleantech
  • StartIt Accelerate
  • Pole Mecatech
  • Agence du Numérique
  • NextGenerationEU
  • Circular Wallonia
  • Innoviris
  • Wallonie Relance
  • Disctrict Cleantech
  • StartIt Accelerate
  • Pole Mecatech
  • Agence du Numérique
  • NextGenerationEU