Between 0 and 1.

AI Agent Systems / Developer Tools / Backend Systems

We design and build systems that connect AI agents, developers, and the software between them.

FEATURED WORK

WORKING EXECUTION BOUNDARY / NOT RELEASED

WAYPOST

Local infrastructure that defines which tools AI can call and connects execution to evidence. Tool-call controls and evidence-based task closure are under development and verification on Linux / WSL2. Not released.

LIVE / LOCAL-FIRST / DESKTOP PRODUCT

VOID.

A local-first desktop app that compiles messy notes into structured tasks and helps you focus on three things for today.

FREE COLLECTION / BROWSER-BASED

SORTED. TOOLS

Free browser tools: prompt builders for product strategy and AI workflows, plus Devterm for looking up developer terms in Japanese and English.

Actual Devterm API search result in Japanese, with the alias Application Programming Interface and related terms including SDK and CLI. — The live Devterm interface showing an API search in Japanese / 2026.09.10

IN USE / DEVTERM

From an unfamiliar term to the next connection.

Devterm is a developer glossary searchable in Japanese and English. Search for API to find its meaning, aliases, and related terms such as SDK and CLI. Try the live tool directly in your browser.

Look up a term in Devterm

TECH STACK

NEXT.JSTYPESCRIPTPYTHONRUSTGOJAVADOCKERAWS

OUR PHILOSOPHY

SYSTEMS,NOT DEMOS.

We build systems that are used, tested, and continuously improved, not prototypes made only to be shown.

Instead of hiding complexity, we make boundaries explicit and design the space between decision and execution as a product.

VIEW SERVICES

STUDIO TERMINAL ONLINE

sb@studio:~$ whoami

StereoBinary

Independent Software Studio

sb@studio:~$ focus

AI Agent Systems

Developer Tools

Backend Systems

sb@studio:~$

STEREO / BINARY / BETWEEN

Layer the parts.Raise the structure.

We preserve independent perspectives, then turn ambiguous connections into explicit systems. That is the StereoBinary unit of design.

STEREO

Layer perspectives, agents, and vendors without erasing their independence.

BINARY

Make permission, denial, state, and responsibility explicit at every boundary.

BETWEEN

Implement the connection itself as an observable, controllable product.

SERVICES

Turn ideas into working systems.

From shaping the concept and technical design to implementing a working product, we build AI-agent systems, developer tools, and the backend foundations behind them as one coherent stack.

AI AGENT SYSTEMS

AI agents embedded in real workflows, including tool integrations, human approval, execution controls, evaluation, and auditability.

DEVELOPER TOOLS & AUTOMATION

CLIs, internal tools, and workflow automation that reduce repetitive work and make development and operations faster and repeatable.

BACKEND & INTEGRATIONS

APIs, authentication, data design, third-party integrations, and asynchronous jobs for products built to keep running.

CONTACT

Start a conversation.

Bringing AI into a workflow, replacing manual work with a tool, or untangling API integrations? You can start before the requirements are settled. Tell us what is difficult today and what you want to change. Technical questions and collaboration inquiries are welcome too.

yumakakuya@stereobinary.com