Anvil Table
Blackjack strategy trainer — basic strategy and most counts are free. Optional: Hi-Lo deviations $5/mo, Wong Halves $1/mo, Halves deviations $5/mo, all included $10/mo. Educational use only, no real money.
Open toolTheory & notes →Free tools
26 free tools. Zero accounts, ads, or tracking.
Everyday utilities that run in your browser — your data stays on your device.
100% client-sideNo sign-upFree to use
These browser tools run on your device. They are free utilities, not paid deliverables, and are separate from Anvil’s engineering services. Anvil Table is an educational blackjack study trainer — no real money, not for use at a live table.
Draft Coach
Lock sourced materials, optional LLM draft of joins, and optional Pangram 4 check with your keys. Not a humanizer.
Open toolTheory & notes →Course Readings
Lock an in-bounds course bibliography, write the draft yourself, and insert citations only from that corpus. Evidence map for uncited paragraphs — no LLM generation.
Open toolTheory & notes →Course Lab
Lock allowed JS snippets, write your own code, run it in a sandboxed iframe, and tick attributions. Educational — not an autograder and not open-web Copilot.
Open toolTheory & notes →Civic Desk
Dual-role local desk with priority, department triage, offline map pin, up to three IndexedDB photos, and CSV export — educational, not a live municipality 311.
Open toolTheory & notes →PID Controller Simulator
Tune Kp / Ki / Kd on a first-order, second-order, or integrating plant — step response, Bode-like plots, and simple stability hints.
Open toolTheory & notes →G-code / Toolpath Visualizer
Load G-code or SVG toolpaths, animate the path in 3D, show feed rates, estimate time, and flag rapid moves near Z ≈ 0 (heuristic, not a collision checker).
Open toolTheory & notes →Dimensional Analysis Solver
Enter equations with mixed units — dimensional consistency checks and SI conversions. Bind variables with let; unit names can be shadowed.
Open toolTheory & notes →Signal Generator & Scope
Generate sine / square / triangle / noise / arbitrary waveforms, with a live oscilloscope, frequency view, and a CSV sample dump.
Open toolTheory & notes →Simple 2D Fluid Visualizer
Educational D2Q9 lattice-Boltzmann demo with obstacles, a velocity colour map, and a displayed Reynolds number (not a real Re setpoint).
Open toolTheory & notes →Markdown Editor
Write markdown with live preview, toolbar shortcuts, and export to .md, HTML, or print / Save as PDF.
Open toolJSON Formatter
Beautify, minify and validate JSON — JSON on one side, a human-readable outline on the other.
Open toolText to JSON
Turn plain text into structured JSON — key–value fields, dashed lists under headers (e.g. Services:), CSV, or a field schema.
Open toolDiff Checker
Compare two texts side by side with line and character-level highlighting — export a unified diff.
Open toolInvoice Generator
Create professional invoices with live preview, taxes and totals — then print or Save as PDF from your browser.
Open toolPomodoro Timer
Focus sessions with breaks, chimes, notifications and daily productivity stats.
Open toolPassword Generator
Cryptographically secure passwords and passphrases, with entropy estimates (brute-force space for generated secrets).
Open toolUnit Converter
Length, mass, temperature, data, pressure, fuel economy and more — converted live, both ways.
Open toolColor Palettes
Generate harmonious palettes, check WCAG contrast, and export straight to CSS variables.
Open toolExpense Tracker
Track income and spending by month with budgets, category breakdowns and CSV export.
Open toolHabit Tracker
Build streaks with daily check-ins and a GitHub-style heatmap for every habit.
Open toolText Toolkit
Word counts, case conversion, line tools, find & replace, Base64/URL encoding and more.
Open toolRegex Tester
Test regular expressions with live match highlighting, capture groups, replace preview and a cheatsheet.
Open toolDate Calculator
Days between dates, add or subtract time, exact age, saved countdowns, week numbers and more.
Open toolLoan & Interest
Loan payments with full amortization schedules, extra-payment savings and compound interest growth.
Open toolWorld Clock
Live city clocks, timezone conversion and a meeting planner that shows overlapping work hours.
Open tool
These browser tools run on your device. They are free utilities, not paid deliverables, and are separate from Anvil’s engineering services. Anvil Table is an educational blackjack study trainer — no real money, not for use at a live table.