Cloud · Infrastructure · Engineering

Cloud and infrastructure tools for real work.

Azure VM sizing, price comparison, Kubernetes planning, Linux helpers, licensing estimators, and compact operational utilities for actual technical workflows.

44 live tools 13 active categories
Why cld2day

Why use cld2day tools?

Built for engineers who need answers fast, not platforms that need sign-ups to show you a CIDR table.

No account needed

Every tool is open and usable immediately. No sign-up, no email, no paywall.

Zero ads

No banners, no sponsored results, no distractions. Just the tool and the answer.

Fast results

Search, filter, and get to the right tool in seconds — not after scrolling past marketing copy.

Built for engineers

Inputs and outputs are in the units you actually use: vCPUs, GiB, CIDR blocks, octal permissions.

Focused scope

Each tool does one thing well. No bloated multi-purpose pages that half-answer ten questions.

Open catalog

See every live and planned tool at once — statuses, categories, and links all in one place.

Just shipped

Recently added tools

The newest additions to the catalog.

Cloud Calculator Featured

Azure OpenAI Token & PTU Cost Calculator

Estimate Azure OpenAI monthly cost from token usage, compare models, and find the pay-as-you-go vs provisioned throughput (PTU) break-even.

Cloud Wizard Featured

Azure Compute Decision Wizard

Choose an Azure compute service from your workload requirements — VMs, App Service, Functions, AKS, Container Apps, Batch, and more — with the trade-offs behind each recommendation.

Governance Generator Featured

Azure Resource Naming Generator

Generate CAF-compliant Azure resource names with live validation against per-type length, character, and uniqueness rules.

Cloud Calculator Featured

Azure DNS Resolver Sizing Calculator

Size Azure DNS Private Resolver endpoints from workload QPS estimates. Get Pattern B vs Pattern C recommendations, monthly cost, and a Bicep skeleton.

Web Reference Featured

Firewall Port Reference

Searchable reference for TCP, UDP, SCTP, and DCCP port assignments with IANA status (Yes/Unofficial/Assigned/No/Reserved), OS usage, and practical firewall guidance.

Email Builder Featured

DKIM Selector Helper

Parse an existing DKIM record, build one manually, or generate a new RSA key pair locally in your browser.

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Choose your engineering role to jump directly to the tools that are most relevant for your day-to-day work.

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