Developer

Pick the Right Developer Tool

This page covers the tools used most frequently during software development — the utilities you reach for when you need a quick calculation, format check, or generator. They're organized by the type of task so you can find what you need without scrolling through a full list.

AI and Machine Learning Costs

If you're building with LLM APIs and need to estimate monthly costs before shipping, the API Cost Calculator computes token costs across providers (OpenAI, Anthropic, Google) based on input/output volume. For multi-agent systems with chained LLM calls, the AI Agent Cost Calculator models the cost of an agent pipeline with multiple tool calls and context accumulation per run. If you're working with RAG architectures, the RAG Chunk Size Calculator helps pick optimal chunk size and overlap based on your embedding model's context window.

The Context Window Calculator estimates how many tokens a given document or conversation will consume in a model's context window — useful when you're right at the boundary. For production deployments where latency matters, the AI Model Latency Estimator benchmarks expected response time at different token lengths. The System Prompt Tokenizer breaks down token count by section for system prompts. For evaluating whether to self-host a model vs. use an API, the Vector DB Sizing Calculator estimates storage and memory requirements at different dataset sizes. Cloud function users can model cold start impact with the Lambda Cold Start Calculator and budget CI/CD with the GitHub Actions Cost Calculator. See all tools and guides in the AI & ML Cost hub.

Code Utilities and Formatting

For quick JSON validation and formatting, the JSON Formatter parses, validates, and pretty-prints JSON with syntax highlighting and inline error messages — faster than switching to an IDE for one-off checks. The Base64 Encoder/Decoder handles both encoding strings or files to Base64 and decoding Base64 back to the original, including binary data. URL encoding issues are common when working with query strings — the URL Encoder/Decoder handles percent-encoding in both directions.

When reviewing code changes or comparing text versions, the Diff Checker shows line-by-line differences with a side-by-side view. For writing or debugging regular expressions, the Regex Tester evaluates your pattern against test input in real time, showing matches and capturing groups. The Unix Timestamp Converter converts between Unix timestamps and human-readable dates in any timezone — useful for debugging log files and API responses. See all tools and guides in the Code Utilities & Formatting hub.

Web Development and SEO

If you're setting up a new page and need correctly structured meta tags, the Meta Tags Generator outputs the full set of title, description, Open Graph, and Twitter Card tags for any URL. For controlling crawler access, the Robots.txt Generator builds a properly formatted robots.txt file from a UI, and the Robots.txt Tester checks whether a given URL is allowed or blocked by your current rules. URL slugs can make or break SEO — the Slug Generator converts any title or phrase into a clean, hyphenated, lowercase URL-safe slug.

For structured data, the JSON-LD Generator produces valid Schema.org markup for common types (Article, Product, FAQ, LocalBusiness). The OG Image Generator creates properly sized Open Graph images. For server configuration, the .htaccess Generator builds redirect rules and access control directives, and the CORS Header Generator outputs the correct response headers for your cross-origin policy. Performance-conscious developers can optimize caching strategy with the HTTP Cache Header Builder. See all tools and guides in the Web Development & SEO hub.

Security and Authentication

For generating secure passwords with specific character requirements, the Password Generator lets you set length, character sets, and quantity. JWT debugging is a constant need when building auth flows — the JWT Decoder decodes any token into its header, payload, and signature components without requiring a secret, and the JWT Generator creates tokens with a custom payload for testing. The UUID Generator produces v1 or v4 UUIDs in bulk. For projects that need a privacy policy, the Privacy Policy Generator produces a customized policy document based on your data collection practices. Network tools include the IP Subnet Calculator for CIDR block sizing and host count calculations. See all tools and guides in the Security & Authentication hub.

Infrastructure and DevOps

Cron expressions are notoriously hard to read and write correctly. The Cron Generator lets you build cron expressions visually — pick minute, hour, day, month, and weekday from dropdowns and see the human-readable description and next 5 run times. For sizing containerized applications, the Docker Image Size Calculator estimates compressed image size, and the Kubernetes Resource Calculator converts between CPU/memory requests and limits for pod specs. The CDN Cost Estimator models monthly bandwidth cost across major CDN providers at your expected traffic levels.

For version management, the Semver Calculator parses and compares semantic version strings. The Git Commit Message Generator helps write conventional commit messages in the correct format. HTTP status code lookup is covered by the HTTP Status Codes Reference. Quick QR codes for internal URLs or test links can be generated with the QR Generator. When you need realistic-looking test data, the Fake Data Generator produces names, emails, addresses, and other field values in bulk. See all tools and guides in the Infrastructure & DevOps hub.

Visual and design utilities — color palettes, contrast checkers, CSS gradients, and font size converters — are grouped in the Design & Visual Tools hub.