A laptop, a glass of water and a table lamp on a wooden desk

We are a husband-and-wife creative studio, building apps and (mostly) digital products for over fifteen years — driven by curiosity and the joy of bringing ideas to life.

Sarah Dorweiler and Gerald Reimertz

Apps & digital products,
from idea to launch

We’re Sarah and Gerald, a creative team who specialize in bringing ideas into reality. Since 2011 we do this for projects we run ourselves and for our clients we realize their ideas “turnkey” — taking the initial spark all the way to the finished product.

We have two very distinct ways of thinking. Sarah approaches things visually and through design, while Gerald thinks strategically and logically. These different perspectives complement and challenge each other, helping us explore ideas from more angles and push them further than either of us might on our own.

We love what we do and we only work together with people who are passionate themselves.

Selected work

A small selection of projects
we have created over the years.

  1. visualOS — preview

    Our newest product: an infinite canvas for collecting, arranging and thinking visually — moodboards, notes, images and ideas side by side. Concept, design and development entirely in-house.

    Role
    Concept, design, development
    Type
    Infinite canvas app
    Since
    2026
    Visit visualos.app
  2. Aesence — preview

    In 2015 Sarah founded Aesence out of a deep fascination for minimalist aesthetics. What began as a personal archive, gradually developed into one of the leading independent publications for minimalist art and design.

    2026, her first book was published in collaboration with Jonas Bjerre-Poulsen and gestalten Verlag.

    Role
    Founder, Editor-In-Chief
    Type
    Online Publication
    Since
    2015
    Visit aesence.com
  3. parcello — preview

    Our longest-running product: parcel tracking for everyone. parcello brings shipments from all major carriers into one place — as apps for iOS and Android, a browser extension, shop plugins and a B2B API.

    Built, run and refined for well over a decade.

    Role
    Founders, product, engineering
    Type
    Apps, platform & API
    Since
    2011
    View on the App Store
  4. movory — preview

    AI-supported infrastructure for fair participation. For Movory GmbH we deliver the product turnkey — brand, product design, web platform and backend — as one team from first concept to launch.

    Role
    Turnkey delivery
    Client
    Movory GmbH
    Status
    In progress
    Visit movory.de
  5. Evano — preview

    In 2018, we founded Evano — with the vision of creating a place for people who share more than just common interests. A place for genuine exchange and meaningful encounters.

    Until Covid, we hosted inspiring events at our beautiful location in the heart of Berlin and retreats in Spain and Croatia. Since then, the spirit of Evano has lived on within us, and we will most certainly bring it back to life in the future.

    Role
    Founders
    Type
    Community, Events, Retreats
    Years
    2018 – 2021