Work
Astive
A creator commerce platform for Japan — sell your own templates, PDFs, video materials, and online courses, with identity verification and pre-publication review built in. Gather on social, sell on Astive.
Small tools
for a brighter future.
Aster Works builds practical digital tools
that brighten work, learning, and daily life.
Writing, cost calculations, organizing information, everyday decisions—we release small, easy-to-use web tools, one at a time.
Tools
View all tools Tools
Simple tools that make daily work a little lighter.
Life
Aster Support Navi
A support-program navigator that helps you find public assistance programs to check by address and life situation, then organize the next steps. Starting with childbirth and childcare support in Tokyo’s 23 wards.
Life
Aster Tools
From age, loan, and tax calculators to unit conversion and writing helpers — a free toolkit for the small chores of work and daily life. No sign-up, multilingual.
Products
Live products
Real, usable tools published for indie developers and Claude Code users.
Dev tool Live npm
Aster Guard
Check safety at a glance, before you connect.
A lightweight security scanner that checks MCP servers and .mcp.json before you connect them — built for Claude Code users and indie AI developers.
$ npx -y @asterworks/aster-guard scan 
- Detects 12 risk types via static analysis (prompt injection, secrets, dangerous installs, and more)
- Reports a risk score (0–100) and grade (A–F) in a Japanese or English report
- Runs fully local with no external transmission; read-only by default for safety
- Works as an MCP server callable from Claude Code, and in GitHub Actions
Dev tool Live npm
Aster Agent Audit
See your AI agents' work — safely.
A local-first dashboard that makes Claude Code and Codex work visible across safety, work-audit, and outcomes — surfacing risky commands, secret exposure, and MCP config risks, all on your machine.
$ npx -y @asterworks/agent-audit dashboard 
- Replays a session as prompt → tool call → diff → tests → commit
- Flags dangerous commands, secret exposure, and MCP config risks with evidence and a fix
- Built-in MCP config scan (AAC-* rules, A–F grade) mirroring Aster Guard
- Fully local, nothing uploaded — secrets redacted before storage, binds 127.0.0.1 only
For your everyday
For your work, learning, and life.
Work
Review replies, writing, task organization, templates.
Learning
Study plans, note-taking, research aids, lesson materials.
Life
Cost simulations, budgeting, making daily life visible.
Concept
What Aster Works cares about
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Small tools you can use right away —rather than big systems.
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Screens you can use without thinking —rather than complicated instructions.
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Everyday usefulness —rather than flashy features.
Aster Works builds tools that ease the small frictions and hesitations woven through work, learning, and daily life.
Approach
Usefulness, above all.
Aster Works combines web technology, thoughtful template design, and AI where it genuinely helps, to build practical digital tools that support your everyday work.
Rather than putting technology front and center, we care about what is easy to use, easy to understand, and truly helpful.
Small tools, one at a time.
A roundup of our live and upcoming tools. Requests and questions are always welcome.