// free tools, no signup
Free online tools,
Free online tools,
built for everyone.
SudoTool is a collection of free, browser-based utilities for developers and non-developers alike. No account, no installation — just open and get things done.
Featured Tools
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Tile Calculator
Tiles, boxes, grout, and trim with NTCA-aligned waste factors (10/15/18/20% by pattern). Subway, hex, large format, mosaic sheets. Imperial and metric.
Home
Paint Coverage Calculator
How many gallons of paint do you need? Accounts for surface texture, finish, coats, doors, windows — with optional cost estimate. 100% in your browser.
Home
Sleep Cycle Calculator
Find the best bedtime or wake time using 90-minute sleep cycles. Live "going to bed now" mode, visual NREM/REM timeline, and CDC age guidelines.
Lifestyle
Rent vs Buy Calculator
See your exact break-even year and the rent threshold where buying wins. Year-by-year net worth table. Save named scenarios locally, no signup.
Finance
Credit Card Payoff Calculator
Compare debt snowball vs avalanche side by side. Up to 5 cards, extra payments, lump sums, and promo APRs. Auto-saves in your browser.
Finance
Auto Loan Calculator
US auto loan payments with state sales tax, trade-in credit, and fees. 50-state tax logic, credit-tier APR presets, side-by-side term comparison, and full amortization.
Finance
Mortgage Calculator
US mortgage payments with PMI, taxes, insurance, and extra payment scenarios. ZIP-based tax auto-fill, full amortization, and screenshot-ready share cards.
Finance
Readability Score Checker
Analyze text readability with 7 algorithms. Visual sentence highlighting, improvement tips, and grade-level targeting. Free and private.
Writing
EXIF Metadata Viewer
View and remove EXIF data from photos. See camera settings, GPS location, and strip metadata before sharing. 100% browser-based.
Privacy
Why SudoTool?
No signup required
Every tool on SudoTool is available instantly. No account, no email, no password.
Just open your browser and start working.
Built for everyone
Whether you're a software engineer or just need to format a file for the first time,
our tools are designed to be simple and approachable.
Free, always
All tools on SudoTool are completely free to use. We believe useful utilities should
be accessible to everyone, without paywalls.
About SudoTool
SudoTool is a growing collection of free online utilities designed to make everyday tasks easier. Each tool is purpose-built to be fast, reliable, and useful — whether you're a developer or just someone who needs to get something done.
We built SudoTool because too many useful tools are hidden behind sign-up walls, ads, or paywalls. Our goal is simple: provide clean, no-nonsense tools that work in any browser, on any device, for anyone.
New tools are added regularly. If you have a suggestion for a tool you'd like to see, feel free to reach out.
From the Blog
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How to Calculate Tile for a Room
Tile math is three numbers — floor area, tile size, and a waste factor. This step-by-step guide works a full example and flags the mistakes that leave you a box short on installation day.
Paint Sheen Guide by Room: Which Goes Where
Each room has a different paint sheen sweet spot — matte for bedrooms, satin for hallways, semi-gloss for kitchens and trim, flat for ceilings. Room-by-room decision matrix with the exceptions worth knowing.
Best Paint for Bathroom: What Actually Works
Bathroom paint differs from regular wall paint in three ways: mildewcide, moisture-resistant resin, and scrubbable sheen. Top 5 picks compared — Aura Bath & Spa, Zinsser Perma-White, Sherwin Duration, Behr Marquee.
Interior vs Exterior Paint: The Real Difference
Interior and exterior paint share an acrylic-latex base but use different binders, additives, and VOC formulas. Swap them and you'll see damage in 3-6 months or breathe VOCs for weeks — here's why.
How Much Trim Paint Do I Need? The Linear-Foot Math
Trim is the painting category most homeowners over-buy on. Walls measure in sq ft directly, but trim measures in linear feet first — then converts via trim width / 12. A 12x12 bedroom fits in 1 quart of trim enamel.
How Much Paint for an Accent Wall? Quart vs Gallon
Paint stores recommend a gallon by default for accent walls — but a standard 8x10 ft accent wall (80 sq ft) often fits within 2 quarts. Plus tinted primer for the inevitable dark color change.