Otter & Stein
Custom software

What doesn’t exist yet.

Existing programs don’t fit the workflow — or the product needs its own firmware. We build desktop apps, web apps, interfaces, data pipelines and embedded systems. You own the source code.

The situation

Existing programs don’t fit the workflow, data is copied between tools by hand — or a product needs its own firmware and has to go to market.

The result

Desktop app, web app, interface, data pipeline or firmware — a working prototype in days, then expansion together with you. For products on the market: Cyber Resilience Act compliant.

Getting started

Technical clarification → specification and a working prototype in days → iteration → handover with source code and documentation.

IncludedRequirementsPrototype in daysIteration with youYou own the source codeDocumentation and instructionsCRA-compliant where sold

Tools that run every day.

Built for ourselves and for clients — every example is in use, not in a drawer.

Specialist software

Laufkarten-Studio

Fire brigade route cards to DIN 14675 from plans and detector lists: 96 pages for an outlet centre, collision-checked, print-ready.

Specialist software

Firebird

Fire service operation plans to DIN 14095 from building data — title block, legend and overview from one source, changes without redrawing.

Planning tool

ParkSolver

Automatically generate and compare parking layouts for garages and carports under the Bavarian garage and parking regulation — for planners who need variants, not just one.

Data pipeline

Geodata → 3D

Official terrain, building and aerial image data automatically become a 3D environment for Blender, Unreal and Twinmotion.

Web app

ME/CFS-Tagebuch

Log symptoms daily and see the progression — as a PWA on the phone, without an app store, with its own backend. Free for people with ME/CFS.

Embedded

Firmware and hardware

Firmware, sensors and IoT — for manufacturers bringing a product to market.

Cyber Resilience Act — considered from the start.

Software that is delivered or sold to third parties falls under the EU Cyber Resilience Act. Reporting obligations have applied since 11 September 2026; full application follows on 11 December 2027. We build this in instead of retrofitting it: a vulnerability reporting channel, a software bill of materials (SBOM), security updates separate from feature updates, a support period.

Not legal advice. Whether and in which product class your product falls, we clarify with you before placing it on the market — with lawyers if in doubt.

How we work.

A prototype in days, not months.

First conversation

30 minutes

You tell us what hurts. We tell you whether and how we can help.

Quote

Fixed price or capped hours

A clear frame with a cap. No surprises, no website-builder rent.

Prototype

in days

You see early what is taking shape and steer along. Iteration instead of a novel-length spec.

Handover

with source code

Source code, documentation, instructions. You don't depend on us — but we stay within reach.

What should be built?

daniel@otterstein.ai
+49 8362 880 93 90
Otter & Stein AI GbR · Drehergasse 40 · 87629 Füssen · Germany

Write to us

For a first conversation, this is enough:

  • What is done by hand today that a program should take over?
  • Will it run internally — or be delivered to customers?
  • Are there interfaces we need to connect to (ERP, CAD, accounting, devices)?