Independent and bootstrapped, since 2026
If it can be simpler, we'll make it simpler.
Free, precision-grade utilities unit converter, color converter, AI token counter, invoice generator and more for developers, students, designers and engineers worldwide.
All free, no account needed
- Unit types
- 28+
- Free tools
- 10+
- Free forever
- 100%
- Countries served
- 195
The developer behind the tools
Every tool here is designed, built and maintained by the same person, so the accuracy you rely on has a name attached to it.
Devansh Gondaliya
Ahmedabad, Gujarat, India
Founder and builder
I build scalable, production-ready web applications end to end, from the database to the interface, and now the AI layer on top.
I am a full-stack software developer with over 2 years of experience specializing in the MERN stack, building scalable and high-performance web applications. I have strong expertise in developing robust backend systems using Node.js and Express, along with crafting modern, responsive user interfaces using React and Next.js. My experience includes working on complex platforms such as CMS, CRM, and ATS systems, where I focused on clean architecture, efficient data handling with MongoDB, and delivering reliable, production-ready solutions.
Beyond core development, I have also worked on integrating advanced technologies to enhance application capabilities. This includes implementing AI-powered features such as GPT-based chatbot functionalities and building automation workflows using agent-based systems to reduce manual development effort. I am passionate about solving real-world problems through technology, continuously improving my skills, and creating solutions that are practical, scalable, and user-focused.
Interfaces people enjoy using
Modern, responsive user interfaces with React and Next.js, built to stay fast and readable on any screen.
- React
- Next.js
- Responsive UI
Backends that hold up
Robust APIs and services on Node.js and Express, with clean architecture and efficient data handling in MongoDB.
- Node.js
- Express
- MongoDB
AI features that ship
GPT-based chatbot features inside real applications, plus agent-based workflows that cut down manual development effort.
- GPT integrations
- LangGraph workflows
Production platforms
Experience on complex CMS, CRM and ATS systems, including third-party integrations, delivered as reliable, production-ready solutions.
- CMS
- CRM
- ATS
- Aircall + Merge.dev
Utility software should be a joy to use, and free, always.
UntangleTools is a dedicated platform designed to simplify complex digital tasks. Whether you are a designer struggling with color consistency, a developer navigating unit conversions, a student tracking grades, or a freelancer generating invoices, our mission is to provide precision tools that remove friction from your workflow.
We started because every existing tool was either hidden behind a paywall or poorly designed.
Why you can trust the results
We don't just output raw numbers. Every tool is built with context, precision, and an understanding of the problems people bring to it.
Authoritative sources only
Unit conversions use factors from NIST. Color math follows the W3C specification. AI token counts mirror the official tokenisation libraries.
- NIST SP 811
- BIPM SI Brochure
- W3C color spec
- Official tokenisers
Full floating-point precision
We never round mid-calculation. Results use full JavaScript 64-bit precision and are formatted only when displayed, the same approach scientific software takes.
Your data stays in your browser
Conversion values, token text, color codes and grade data stay client-side. Nothing is logged, stored or transmitted. Privacy by architecture, not by policy.
How accuracy is kept
Tools are regularly tested
Each converter and calculator is validated against reference values from NIST, BIPM and W3C. Edge cases such as extreme values, unit boundaries and floating-point traps are tested before an update ships.
Content is researched and fact-checked
Articles and guides come from primary sources. We do not generate or spin content, and every factual claim is traceable to its original reference.
Factors come from standards bodies
No crowd-sourced conversion tables. Unit factors come from NIST Special Publication 811 and the BIPM SI Brochure, so they match values used in science and engineering.
Safety-critical disclaimers included
For medical, engineering or legal conversions, we remind you to verify results against a primary source. Precision is the goal; responsible disclosure is the duty.
Our principles
What every tool on the platform is held to.
Precision First
Every tool is grounded in authoritative standards — SI, BIPM, NIST, ISO. Correctness is non-negotiable, whether you're a student or a senior engineer.
Zero Friction
No sign-ups. No paywalls. No clutter. Fast, clean tools that respect your time and deliver answers the moment you need them.
Design as Function
Beautiful interfaces reduce cognitive load. We believe clarity and aesthetics are the same thing — and neither should ever be sacrificed.
Universal Access
Tools that only work for some people don't work at all. Everything we build is free, global, and accessible to anyone with a browser.
The full toolkit, all free
Every tool on the platform. No paywalls, no accounts required.
- Unit Converter28+ units across 6 SI-standard categories.
- AI Token CounterEstimate token usage for OpenAI & Anthropic models.
- Color ConverterInstant HEX ↔ RGB conversions for designers & devs.
- Invoice GeneratorCreate professional invoices in seconds, no account needed.
- AI Carbon CalculatorMeasure the carbon footprint of your AI usage.
- Age CalculatorExact age in years, months, days, hours — instantly.
- Grade & GPA CalculatorPlan your academic performance with weighted scoring.
- Text ToolsText-to-array, repeat text, number-to-words, and more.
We reply within 48 hours
Got a bug, an idea or a partnership in mind?
Bug reports, feature suggestions, partnership enquiries, or just a hello. We read every email.
support@untangletools.com
Who we are
- Location
- Ahmedabad, Gujarat, India
- Founded
- 2026
- Business type
- Independent, bootstrapped
We collect only anonymised analytics (via Vercel) to improve the platform. Your calculation data never leaves your device.
Open a tool and get your answer.
No account. No download. No cost, ever.
Your data never leaves your browser
