Developer Tools Calculators

API Design & Rate Limiting: Building APIs That Scale Without Breaking

How to design REST APIs that scale: HTTP methods, status codes, pagination, rate limiting (token bucket, sliding window), JWT auth, and security best practices.

Caching Strategies Explained: From Browser to Database, and the Stale Data in Between

Caching strategies every developer should know: HTTP caching, cache-aside, write-through, Redis patterns, and cache invalidation — plus the stale data problems.

Conversion & Measurement Guide: Units, Systems, and How to Convert Anything

Why do we have so many units? Measurement systems, conversion math, and the everyday numbers behind trading, building, navigating, cooking, and traveling.

Data Engineering Basics for Developers: Pipelines, Warehouses, and Streaming

What every developer should know about data engineering: ETL vs ELT, warehouses vs lakes, batch vs streaming, dimensional modeling, and pipeline patterns.

Database Performance for Developers: Indexing, Query Plans, and the Queries That Don't Scale

How database indexes work: B-trees, selectivity, composite and covering indexes, and reading EXPLAIN plans so your SQL queries scale past 10 million rows.

Design Tools Guide

Design tools guide: WCAG color contrast, the golden ratio, and aspect ratios. Combine readability and proportion tools to build better, accessible layouts.

Developer & IT Tools Guide

Explore version control, CI/CD pipelines, package management, debugging, and security engineering practices that keep professional software systems reliable.

Developer Utilities Guide

Every developer builds a mental toolbox: JSON, regex, UUIDs, cron, timestamps — the recurring data problems every programmer solves, explained with examples.

DevOps & CI/CD for Developers: Containers, Pipelines, and Infrastructure as Code

DevOps for developers: containers, CI/CD pipelines, infrastructure as code, deployment strategies, and monitoring — with practical patterns and tradeoffs.

HTTP & Networking Fundamentals: The Protocol Every Developer Works With

HTTP and networking fundamentals: the protocol's origin, methods, status codes, headers, caching, content negotiation, HTTP/2 vs HTTP/3, and how the web works.

How to Estimate Local LLM Cost per Token

How to estimate the real cost per token of a local LLM — hardware amortization, electricity, and utilization — and compare it against cloud API pricing in 2026.

Tokens per Second Benchmarks Explained: What You're Actually Measuring

Tokens per second benchmarks explained: what the number means, how concurrency changes it, and why single-user speed is not the whole story for local LLMs.

How Much VRAM Do You Really Need for Local LLMs?

Wondering how much VRAM you need for a 7B, 70B, or 405B model? This guide breaks down quantized model sizes, real GPU options, and 2026 hardware limits.

Local vs Hosted LLMs: The Decision Framework

A framework for choosing between local LLMs and cloud APIs. Weigh cost, privacy, latency, and control with 2026 pricing and hardware data, plus the hybrid path.

Arithmetic Essentials: Fractions, Percentages, Ratios & Number Sense

Arithmetic is the oldest and most universal math: fractions, percentages, ratios, and number sense — the foundation beneath every other calculation you will do.

MLOps for Developers: Deploying, Monitoring, and Optimizing Machine Learning Models

How to deploy, monitor, and optimize ML models in production: GPU selection, VRAM requirements, cloud vs local cost, model drift, and CI/CD pipelines for ML.

Security Fundamentals for Web Developers: Authentication, Authorization, and the Attacks You Need to Prevent

Security fundamentals for web developers: authentication vs authorization, JWT, OAuth 2.0, password hashing, and XSS, CSRF and SQL injection prevention.

Spurious Correlations and Fake Patterns: How Arithmetic Manufactures Proof

Spurious correlations, sacred geometry and p-hacking share one recipe: you choose the unit, the power and the target afterwards. Here is how to spot it.

System Design Fundamentals: Scaling, Sharding, and the Trade-offs Every Architect Makes

System design fundamentals: vertical vs horizontal scaling, load balancing, sharding, replication, CAP theorem, and the patterns behind scalable systems.

Understanding Tokens: How AI Models Process Text and Why It Matters for Cost, Context, and Agentic AI

A comprehensive guide to how AI models tokenize text, why token counts differ across providers and tools, and how agentic AI, MCP, and session compaction affect

vLLM vs Ollama: Production Serving 2026

Compare vLLM vs Ollama for LLM serving in 2026: single-user local inference or high-concurrency throughput — with verified benchmarks, see when each wins.

Web Performance on a Budget: Bundle Size, API Limits, and Database Indexes

Learn the three budgets every web app hits: bundle size, API rate limits, and database index selectivity — with the formulas, thresholds, and PR checklist.