Online tools platform
Tools that get it done.
Free online tools for finance, health, developer and design work: loan EMI, compound growth, sleep and adult BMI, JSON compare, time zones and colour palettes.
- 32
- Free tools
- 6
- Categories
- 31
- Need no account
Popular tools
Useful answers, fast.
Transparent formulas, clear outputs and practical context — no spreadsheet required.
- Finance
Personal Loan Calculator
EMI, total interest and charges on an unsecured personal loan.
Open calculator
- Finance
Home Loan Calculator
EMI, amortisation schedule and Section 80C and 24(b) tax relief.
Open calculator
- Finance
Car Loan Calculator
EMI, total interest and on-road charges before you sign at the dealership.
Open calculator
- Finance
Compound Interest Calculator
Project growth over time with contributions, step-up and inflation.
Open calculator
- Finance
SIP Calculator
Project a monthly SIP, solve a goal, and see the step-up and inflation-adjusted result.
Open calculator
- Productivity
Team Time Zone Planner
Add your team, compare local times and find the best meeting slot.
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- Browse library
25 more tools
Explore the full library by category.
Browse by category
Find what you need.
Finance
Run the numbers on loans, taxes, and investments.
- Personal Loan Calculator
- Home Loan Calculator
- Car Loan Calculator
- Compound Interest Calculator
- SIP Calculator
Productivity
Stay focused and keep your day organised.
- To-Do List
- Team Time Zone Planner
- Time Zone Meeting Planner
- Remote Team Time Zone Planner
- IST to EST Converter
- IST to PST Converter
- Explore Developer
Developer
Everyday utilities for building and debugging.
Design
Build palettes, gradients, and brand assets.
- Color Palette Generator
- Website Color Visualizer
- Gradient Generator
- Color Contrast Checker
- HEX to RGB Converter
- RGB to HSL Converter
- Explore Business
Business
Run the day-to-day of a small studio, class or practice.
Business & professional
Tools that remember your work.
Most tools here are done the moment you close the tab. These keep what you enter, because the work carries on past one sitting or has to be seen by someone else — so they ask for a free account first.
- BusinessAccount needed
Class & Attendance Tracker
Track class packages, schedules and attendance, with one tap to mark a class.
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Made for clarity
Straightforward tools. Thoughtful details.
SavBuildTool brings calculators, developer utilities, planners and professional tools together in one place, with clear explanations — and it installs to a home screen when you want it closer to hand.
Transparent by default
See the assumptions and formulas, not black-box answers. Calculations and JSON processing run on your device.
Practical context
Worked examples and guidance help you apply every result to a real decision, with its limits spelled out.
Private and instant
Free to use, with no paid tier, and most tools open straight into the tool. Health measurements and JSON documents stay in page memory and are never uploaded.
Favorites
Your tools, all in one place.
Star a tool anywhere on the site and it waits for you on your favorites page, so the ones you reach for every week are one click away. Starring works straight away on the device you are using; sign in and the list follows you to your phone.
Questions people ask
Before you start.
- Is SavBuildTool free to use?
- Yes. Every published tool is free and there is no paid tier. Advertising pays for the site.
- Do I need an account?
- Not for most of the site: 31 of the 32 published tools open straight into the tool with nothing to sign up for. An account is only needed where something has to be kept for you or shared with someone else — Class & Attendance Tracker, and keeping your favorites when you switch devices.
- What happens to the information I enter?
- Tools process inputs in your browser. Health measurements and JSON documents stay in page memory. Finance share links can include calculator values in the URL, so only share values you are comfortable disclosing. The tools that need an account store what you enter on our servers, and each of those pages says so. Normal page visits are recorded by site analytics.
- Can I install SavBuildTool as an app?
- Yes. It is a progressive web app, so your browser can add it to your home screen or desktop with no app store involved, and it opens in its own window. Pages you have already visited keep working without a connection; one you have never opened shows an offline notice until you are back online.
- Can I rely on these results for a decision?
- Finance calculators provide estimates, not lender quotes or investment guarantees. BMI and sleep tools offer adult health context, not a diagnosis or treatment plan. Each tool explains its assumptions and limits; confirm important decisions with an appropriate professional.
- Which tools are available right now?
- Available now: Personal Loan Calculator, Home Loan Calculator, Car Loan Calculator, Compound Interest Calculator, SIP Calculator, To-Do List, Team Time Zone Planner, Time Zone Meeting Planner, Remote Team Time Zone Planner, IST to EST Converter, IST to PST Converter, IST to GMT Converter, India to USA Time Difference, JSON Formatter, JSON Compare & Merge, Sleep Calculator, BMI Calculator, Color Palette Generator, Website Color Visualizer, Gradient Generator, Color Contrast Checker, HEX to RGB Converter, RGB to HSL Converter, WCAG Accessibility Checker, Complementary Color Generator, Analogous Color Generator, Triadic Color Generator, Shade and Tint Generator, Random Color Generator, CSS Gradient Generator, Image Color Palette Extractor, and Class & Attendance Tracker.
Pick a tool and start now.
Every published tool is free, and most open straight into the tool. Create an account later, only if you want one.