Architecture Tools
Calculators and generators for the arithmetic architecture decisions actually rest on — availability budgets, capacity envelopes, decision records. Each one runs entirely in your browser: no sign-up, no upload, no backend.
3 tools, all free · Reviewed whenever the underlying practice moves
SLO & Error Budget Calculator
Turn an availability target into allowed downtime, a request budget, and a burn rate you can actually alert on.
Capacity Calculator
DAU to peak QPS, bandwidth, storage and instance count — with the multipliers that decide whether the estimate is any good.
ADR Generator
Fill in the decision, get a clean Nygard, MADR 4.0 or Y-statement architecture decision record — copied or downloaded as markdown.
Frequently asked
Are these architecture tools free?
Yes. Every tool is free, needs no account, and has no usage limit. There is no paid tier, because there is no server cost to recover — the tools are static files that compute in your browser.
Is my data sent anywhere when I use these tools?
No. Every calculation runs in your browser with JavaScript. Nothing you type is uploaded, logged, or stored — closing the tab discards it. The site is a static export with no backend, so there is nowhere for the data to go.
Can I use the output in client or internal documents?
Yes. Copy or download the output and use it however you like, including commercially. Treat the numbers as order-of-magnitude inputs to a design review, not as a procurement plan — each tool states its assumptions on its own page.