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NexusDigitalLabs
Software Studio — Open to new projects

Free tools that
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Practical tools built for everyone — fast, private, and simple. Most tools work without an account and collect no personal data.

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Free Tools

Tools built for engineers.

Prompt Architect

Advanced system prompt flattener with live token counting and API cost estimation for LLM workspaces.

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JSON Engine

Turn JSON into TypeScript interfaces, Zod schemas, and JSONPath queries — entirely in the browser.

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SVG Studio

Optimize SVGs, preview on a checkerboard, and export React or Vue components without leaving your machine.

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Env Formatter

Sort, deduplicate, and validate .env files locally with sharp, minimalist output — secrets never leave the tab.

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Prompt Packager

Flatten multi-file context into one LLM-ready block with character and token estimates for Cursor and Claude.

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Invoice Generator

Freelancer invoice builder with live PDF preview, line items, tax configuration, and bank wire details.

Open tool

Debt Optimizer

Short, Medium, and Long plans that clear debt while building savings — no monthly payment guesswork.

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Fuel Tracker

Log fill-ups, track L/100km efficiency, and monitor fuel costs across multiple vehicles with cross-device sync.

Open tool

Articles & Guides

Practical reads for everyday tasks.

View all 17 articles
Fuel & CarsJul 2026·6 min read

How to Track Your Car's Fuel Efficiency

A practical guide to calculating L/100km and km/L, logging fill-ups correctly, and understanding what affects your real-world fuel consumption.

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Fuel & CarsJul 2026·6 min read

How to Save Money on Fuel Every Month

Driving habits, tyre pressure, route planning, and vehicle maintenance changes that consistently reduce monthly fuel spend without changing how far you drive.

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Freelance FinanceJul 2026·7 min read

How to Write a Freelance Contract That Actually Protects You

The six essential clauses every freelance contract must include — scope, payment schedule, revision limits, IP ownership, kill fees, and governing law.

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Freelance FinanceJul 2026·5 min read

5 Invoice Mistakes Freelancers Make That Delay Payment

The most common invoicing errors that slow down payment — vague line items, missing due dates, no payment instructions — and how to fix each one.

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Freelance FinanceJul 2026·6 min read

How to Calculate Your Real Hourly Rate as a Freelancer

The exact formula to calculate your minimum viable hourly rate from income targets, billable hours, taxes, and expenses — not gut feel.

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Prompt EngineeringJul 2026·8 min read

ChatGPT Prompt Templates for Developers — Copy and Use Today

Copy-ready prompt templates for code review, debugging, documentation, architecture decisions, refactoring, and writing unit tests.

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Browse all 17 articles

Mini Games

Browser games, zero installs.

2048

Slide and merge tiles on a 4×4 grid. Reach the 2048 tile to win. Keyboard, WASD, and touch swipe support.

Play now

Snake

Navigate your snake to eat food and grow. Wrap through walls, level up, and avoid your own tail.

Play now

Blackjack

Beat the dealer to 21 without going bust. Dealer draws to 17. Hit, stand, or double down. Classic casino rules.

Play now

Nexus Sudoku

Fill a 9×9 Sudoku with unique solutions. Choose Beginner through Hard — timers and scoring scale with difficulty.

Solve

Gridlock

Memorize a flashing tile pattern, then recreate it. Harder grids, more flashes, shorter windows.

Train memory

Sumoku

Select connected numbers that sum to the target. Clear tiles, drop replacements, race the clock on higher tiers.

Add it up

Cryptic Paths

Trace every edge of a node graph exactly once. Complete Eulerian paths under tighter time limits.

Trace route

Semantic Shift

Classic Stroop challenge — match the word or the ink color before the timer expires. Streak multipliers reward focus.

React
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