Seiraiyu designs, builds, and operates its own products — each one a focused tool for engineers who move fast with AI.
Each brand stands on its own — its own name, kanji, and voice. Seiraiyu is the constant behind them.
Branchable serverless Postgres. Pay for storage; idle compute is free. Fork production like a git branch.
A fast 4-state SystemVerilog RTL simulator with VPI & cocotb support. Free for everyone.
Nimble FPGA & embedded development, powered by agents. Hardware shouldn't be hard.
Parts, BOMs, ECOs & supplier data in one place — Git-native PLM for small hardware teams. CLI and web.
Great developer tools are opinionated, focused, and unmistakably their own. A house brand shouldn't dilute that — it should fund it.
Seiraiyu — 流星, a shooting star — is the still point our tools move around. We handle the parts that don't make a product better when duplicated: billing, infrastructure, hiring, the long-term roadmap.
Everything customer-facing belongs to the brand. kisenon doesn't feel like “a Seiraiyu product.” It feels like kisenon. That's the point.
We build and operate, we don't just hold. Every brand ships real software developers choose to use.
The parent never out-shouts its children. You meet the brand first, the house only if you look.
Shared infrastructure and one balance sheet let each tool grow on its own timeline.
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