Your everyday
technical workbench.
Free calculators, developer utilities, and generators. Do useful work in your browser, with clear assumptions and no sign-up.
58 free tools
Kubernetes node sizing
Turn pod requests into a practical node-pool estimate.
Kafka throughput & storage
Size retained data, replication traffic, and broker capacity.
Vector memory sizer
Estimate raw embedding storage and HNSW memory overhead.
LLM agent cost forecaster
Model agent loops, usage, and your own API token rates.
RAG chunking estimator
Plan chunk counts, embedding spend, and vector storage.
JSON formatter & validator
Validate, format, and minify JSON locally.
JSON structural diff
Compare JSON values by path, ignoring object key order.
Epoch timestamp converter
Convert Unix seconds or milliseconds to UTC and back.
CSS gradient generator
Create a two-color gradient with a live preview.
Printable invoice generator
Create a simple invoice and print or save it as PDF.
Git command quick reference
Filter a compact reference for everyday Git tasks.
Developer learning roadmap
Track a practical learning path on this browser.
Bandwidth & transfer calculator
Estimate monthly transfer and egress spend using your rate.
Image compressor
Make smaller JPG or WebP files with a quality slider.
Resize, crop & rotate
Set exact dimensions, crop coordinates, and rotation.
Image format converter
Convert PNG, JPG and WebP locally, including batches.
Merge PDFs
Combine PDFs in your preferred file order.
Organize PDF pages
Preview, reorder, rotate, remove, and extract pages.
Images to PDF
Turn photos into a single PDF with page and margin controls.
Mortgage payoff calculator
Compare a fixed-rate loan with extra monthly payments.
SIP & compound growth calculator
Project regular investments using your return assumptions.
FIRE savings planner
Estimate a savings target from spending and withdrawal assumptions.
Custom tax bracket calculator
Calculate progressive tax from brackets you supply.
Freelance rate estimator
Turn an annual revenue target into a billable hourly rate.
Adult TDEE estimator
Estimate resting and daily energy expenditure.
Macro split calculator
Convert a calorie amount and percentage split into grams.
Regex tester
Test JavaScript regular expressions with match positions.
Cron translator & next runs
Inspect standard or basic Quartz schedules in UTC.
JSON schema & model generator
Generate JSON Schema, Pydantic v2, TypeScript or Go models.
SQL dialect helper & formatter
Convert a supported subset of common SQL function names.
IAM & RBAC policy generator
Generate scoped, read-only policy starters.
Data retention & masking planner
Draft an engineering retention schedule from your chosen periods.
Privacy notice draft builder
Prepare a structured privacy notice for professional review.
Terms of service draft builder
Create an editable starting point for website terms.
Resume / CV builder
Create a clean, printable resume from your details.
CSS & Tailwind component generator
Design a button, shadow, or grid and copy its code.
LLM price & context comparator
Compare models using prices and context limits you supply.
Salary & cost-of-living workbench
Compare salary and monthly costs using your own data.
Software alternatives directory builder
Filter and export a directory of software alternatives.
Cloud configuration comparison
Compare node pools using prices and capacities you supply.
Docker quick reference
Search a compact command reference.
Kubernetes / kubectl quick reference
Search a compact command reference.
Linux CLI quick reference
Search a compact command reference.
Bash quick reference
Search a compact command reference.
JSON / YAML converter & formatter
Convert JSON and a documented YAML subset locally.
Database & B-tree storage sizer
Estimate row storage and conventional index capacity.
JavaScript API quick reference
Search compact examples of common browser APIs.
Software design pattern directory
Filter patterns by the problem they help solve.
Printable receipt generator
Create a simple receipt acknowledging a payment.
Photo file-size targeter
Try to fit a JPG beneath your chosen KB limit.
Screenshot annotation editor
Draw arrows, highlights, solid boxes and text on an image.
Batch image watermark
Add a text watermark to photos and download a ZIP.
Transparent signature maker
Draw a signature and save a transparent PNG.
SVG to PNG converter
Rasterize a self-contained SVG at your chosen dimensions.
PDF splitter & page extractor
Extract a page range as one PDF or separate PDFs.
PDF to JPG / PNG
Render selected PDF pages and download an image ZIP.
Image-based PDF compressor
Rebuild a PDF with adjustable resolution and JPEG quality.
PDF text, highlight & signature editor
Place text, highlight boxes, or a signature image on PDF pages.
Numbers you can inspect.
Every calculator includes its formula, a static reference table, and editable assumptions. Use your own provider rates and workload measurements to make each estimate relevant to your architecture.