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.
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.
Work Coming Soon
Synaxis
A multi-tenant SaaS for churches that simply manages worship attendance and lunch sign-ups.
Coming soon
Work Coming Soon
Keryx
A Japanese-first workspace for pastors that brings sermon planning, service preparation, and reflection together in one place.
Coming soon
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 @asterworks/aster-guard scan - Detects 11 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
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.