About

Free Online Tools Built for Real Work

Vortenza is a growing collection of free, accurate online tools built for people who need quick, reliable answers, without the clutter, ads, or mandatory accounts that slow everything else down.

Our mission

We believe useful tools should be accessible to everyone. Developers estimating AI API costs, freelancers running tax projections, and small business owners checking loan payments shouldn't have to fight paywalls or hand over their email just to get a number.

Vortenza exists to fill that gap: fast, trustworthy calculators that respect your time and your privacy.

What we offer

Seven categories of tools, with more added every week.

AI Cost Calculators

Token counters and API cost estimators for OpenAI, Anthropic Claude, and more.

Finance Tools

Mortgage, compound interest, loan amortization, and investment calculators.

Tax Calculators

Federal income tax estimators with bracket breakdowns.

Developer Utilities

JSON formatter, encoders, and other everyday developer shortcuts.

Unit Converters

Length, weight, temperature, volume, speed, and more.

AI Content Tools

AI text humanizer, plagiarism checker, AI detection checker, and human-style article writer.

Email Tools

Validate SPF, DKIM, DMARC records, test cold email subject lines, and check spam scores.

Why Vortenza

Three principles guide everything we build.

Free forever

Every tool on Vortenza is and will always be free. No hidden tiers, no usage limits, no credit card required.

No signup required

Open a tool and start calculating immediately. We don't ask for your email, name, or any personal information.

Privacy-focused

Calculations run in your browser. We collect only basic analytics. Your inputs, results, and personally identifiable data are never collected.

How Vortenza tools work

Every Vortenza tool is a static web page that runs calculations in your browser using JavaScript. There is no server receiving your input, no database storing your results, and no account tying your usage history to an identity. When you close the page, the data is gone. This architecture makes the tools faster, cheaper to maintain, and genuinely private by design.

The AI cost calculators use publicly documented token pricing from OpenAI, Anthropic, and Google, updated whenever providers publish rate changes. The tax and finance calculators use published bracket tables and standard financial formulas. We document the math behind every calculator so you can verify the results independently.

Vortenza is built by a small team of developers and writers who were frustrated by calculator websites that hide results behind email gates, run ads on every page, or require accounts to save a single calculation. We built the tools we wanted to use and made them available for free. New tools and guides are added regularly based on what people search for and request.

Get in touch

Have a suggestion, spotted a bug, or want to request a tool? We’d love to hear from you.