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duckkit.dev
Kafka, rate limits, latency math & more, in your browser
Free calculators for platform engineers: kafka sizing, consumer lag, rate limits, latency budgets, ReDoS, DORA, postgres pooling, k8s capacity, and more. No signup, no paywalls. Everything runs in your browser, results in <1s, and every input is shareable via URL.
Hey Product Hunt,
I kept rebuilding the same back-of-the-envelope calculations at work - "how many Kafka brokers before the NIC saturates?", "will this latency stack blow the SLA?", "is bumping max_connections actually going to help?" - so I turned them into duckkit.dev.
What's there now:
Kafka - message size & storage, broker sizing, consumer lag / time-to-overflow predictor
APIs & rate limiting - rate limit calculator (Nginx/Kong config snippets), versioning helper, breaking-change checker
Reliability - latency budget, DORA metrics, incident cost calculator, infrastructure health score (20-question questionnaire → letter grade A–F)
Database & infra - PostgreSQL connection pool sizer, K8s pod capacity planner
Security - ReDoS vulnerability tester + Roast My Config - paste your postgresql.conf, get a prioritized list of misconfigurations with severity badges
A few things that matter to me:
- Open a tool, get an answer. No signup, no account, no email.
- It's 100% client-side - your inputs never leave the browser.
- Disconnect WiFi, it still works. Share a result and the state rides along in the URL.
Formulas follow the specs: Kafka KIPs, HikariCP pool formula, 2024 DORA research, IETF rate-limit drafts. If I got something wrong, say so - I'd rather fix it than defend it.
Solo project, just shipped. What's the spreadsheet you keep rebuilding?
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About duckkit.dev on Product Hunt
“Kafka, rate limits, latency math & more, in your browser”
duckkit.dev was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #122 on the daily leaderboard. Free calculators for platform engineers: kafka sizing, consumer lag, rate limits, latency budgets, ReDoS, DORA, postgres pooling, k8s capacity, and more. No signup, no paywalls. Everything runs in your browser, results in <1s, and every input is shareable via URL.
duckkit.dev was featured in SaaS (43k followers), Software Engineering (42.7k followers) and Developer Tools (515.4k followers) on Product Hunt. Together, these topics include over 131k products, making this a competitive space to launch in.
Who hunted duckkit.dev?
duckkit.dev was hunted by qbm. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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