Here's what shipped this week.
Twenty-six new tools. Eight blog posts. Heads up: this email is longer than usual because there's a lot to cover. Grab a coffee.
Document Generators (the big theme of the week)
A friend asked me yesterday to recommend a free invoice generator. Ten Google results later, all of them wanted my email before showing me a PDF. So I built three.
- Invoice Generator — 6 templates, logo upload, auto tax/discount calculation, 12 currencies. Try it →
- Resume Builder — 5 ATS-friendly templates (Classic, Modern with sidebar, Professional, Minimal, Executive), reorderable sections. Try it →
- Cover Letter Generator — 4 templates with proper business letter formatting. No AI writing — you write it, the tool formats it. Try it →
A Full Music Production Suite in the Browser
My English teacher (yes, really) asked for something to make music with in his free time. That turned into two tools and a DAW.
- Loop Music Creator — a full browser DAW with 14 synth presets, step sequencer, piano roll, and master effects. Try it →
- YouTube Loop Mix — dual-deck DJ mixer with YouTube integration, crossfader, A-B loops, and BPM detection. Try it →
Agile & Project Management (six new)
I've been nerding out on Monte Carlo forecasting and kanban metrics.
- WIP Age Chart — visualize how long your in-progress work has been sitting. The oldest tickets are the ones that'll bite you. Try it →
- Backlog Arrival Rate Forecaster — projects future backlog growth from historical intake. Try it →
- Seasonal Capacity Planner — decomposes delivery history into trend + seasonality so you can plan around the inevitable December slump. Try it →
- Team Formation Optimizer — builds balanced teams from skill profiles. Try it →
- Capability Gap Analyzer — spot where your team is understaffed relative to upcoming work. Try it →
- Six Dimensions Radar — radar chart for team health across delivery, quality, morale, etc. Try it →
AI & Content
- AI Content Detector — ten statistical metrics and eighteen sentence-level signals. Runs entirely in the browser. Not perfect (no detector is), but I explain exactly what it measures so you can judge the scores. Try it →
Health & Wellness (three new)
- Caffeine Half-Life Calculator — models how much caffeine is in your system at any given hour, so you can figure out why you're still wired at midnight. Includes a beverage weight-to-caffeine converter. Try it →
- Body Fat Calculator — Navy, YMCA, and skin-fold methods with proper formulas. Try it →
- Heart Rate Zones — Karvonen formula with age, resting HR, and fitness level. Try it →
Design & CSS (three new)
- Button CSS Generator — visual designer that outputs copy-paste CSS. Try it →
- CSS Text Shadow Generator — multi-layer shadows with live preview. Try it →
- Glassmorphism Generator — backdrop-filter blur with proper fallbacks. Try it →
Security & Cryptography (three new)
- Vigenere Cipher — classic polyalphabetic cipher with keyword encryption and decryption. Try it →
- Morse Code Translator — text to/from morse with audio playback. Try it →
- Random Token Generator — cryptographically secure tokens for API keys, session IDs, etc. Try it →
Everyday Utilities (four new)
- Cooking Conversion — cups to grams to ounces with ingredient-specific density. Try it →
- Dog Age Calculator — proper breed-size-adjusted dog years (not the “multiply by 7” myth). Try it →
- Speed Distance Time — solves for whichever variable you don't have. Try it →
- Dice Roller — D&D dice notation (3d6+2) with cryptographically random rolls. Try it →
- PDF Compressor — reduces PDF size by downsampling images and removing metadata. Works on files up to 100MB in the browser. Try it →
From the Blog
Eight new posts this week. The short list:
- I Built a Free Invoice Generator, Resume Builder, and Cover Letter Generator That Don't Require Signup — the story behind this week's document tools.
- AVIF in 2026: The Complete Guide — 30-50% smaller than JPEG, supports HDR, and 93% browser coverage.
- I Built a DAW and a DJ Tool in the Browser Because My English Teacher Asked — how the music tools happened.
- Caffeine Half-Life and Why Your 4pm Espresso Is Ruining Your Sleep — the math of caffeine metabolism.
- The Complete PDF Toolkit (All in Your Browser) — 28 PDF tools, zero uploads.
- 6 Agile Tools for WIP Aging, Forecasting, and Team Formation — the agile suite explained.
- Monte Carlo Forecasting for Agile Delivery — probabilistic estimation that actually works.
- How to Detect AI-Generated Content — the methodology behind the AI detector.
What's Next
Receipt Generator, NDA Generator, Meeting Minutes Generator, Contract Generator, Risk Assessment Generator, Quote/Estimate Generator. All planned. Same pattern: form data, live preview, clean PDF.
Got a tool idea? Reply and suggest it. I build what you ask for.
— Aral