MonsiTools

npx add-mcp 'https://monsitools.com/mcp'

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MonsiTools is a collection of online calculators, generators, converters, and business utilities designed to help individuals, freelancers, students, marketers, entrepreneurs, and businesses complete everyday tasks quickly and accurately. Our tools are browser-based, meaning there's nothing to download or install.

No. Most tools can be used immediately without creating an account. Some premium features, saved preferences, or future functionality may require an account, but the majority of tools are available instantly.

Every visitor gets a limited allowance: 15 uses without an account, or 25 a month once signed in. Each visit to a calculator page counts as one use, and you can recalculate on that page as often as you like until you leave or refresh it. Premium removes the limit on every tool.

MonsiTools is designed for everyone, from students and casual users to business owners, marketers, developers, eCommerce sellers, accountants, and financial professionals. Whether you're solving a simple calculation or managing business decisions, our tools are built to save time.

Open the tool you need, type in your values, and press calculate or generate. Your result appears right away, with no page reload.

Yes. On Build a calculator, name the inputs, write one formula (for example price - cost - shipping) and choose whether the result reads as a number, money or a percentage. You can use it on its own, share it with a link that carries the calculator but never your numbers, and add it as a step in a custom workflow. The limited plan keeps 5 of them and Premium keeps up to 100.

Yes, with the Data Workbench. Load a CSV, TSV or JSON file once, then add steps such as removing duplicates, fixing dates and numbers, filtering, joining a second file, or grouping and summarizing. Save the steps as a recipe to reuse next time. It runs in your browser, so the file is never uploaded.

Our tools are built using tested formulas and standard calculation methods whenever applicable. While we strive for accuracy, results should be treated as estimates unless otherwise stated. For legal, financial, tax, or medical decisions, always verify results with a qualified professional.

Errors usually occur when required information is missing or an invalid value has been entered. Check that all required fields are completed and that numbers are entered in the correct format.

Yes. MonsiTools is fully responsive and works on desktops, laptops, tablets, and smartphones using any modern web browser.

By default, most calculations are processed directly in your browser and are not permanently stored. Some tools may temporarily save information to improve your experience, such as remembering your last inputs.

Yes. We are committed to protecting user privacy and only collect information necessary to operate and improve the platform. We do not sell personal information to third parties.

Yes. Cookies may be used to remember preferences, improve website performance, analyze usage, and enhance your browsing experience. You can manage cookie settings through your browser.

No. Your calculations are private. Unless you intentionally share exported results or generated links, your data remains accessible only to you.

Yes. Without an account you get 15 calculator uses in total. Signed in, you get 25 calculator uses and 5 workflow runs every month, reset on the 1st (UTC). Opening a calculator and getting your first result is one use; recalculating on the same page is not. Premium removes every limit.

Unlimited calculator uses and workflow runs, custom workflows with any number of steps, CSV batch mode on calculators, workspace variables, Data Workbench batch runs and up to 50 saved recipes, branded PDF exports, workflow decision reports, and a JSON API key plus an MCP server for AI assistants. Projects, favorites and history sync across devices on every plan.

Weekly is $2.49, monthly is $5.49, and yearly is $44.99, which works out to about $3.75 a month. The pricing page has the full comparison.

Sign in, open the pricing page and pick a plan. Checkout is handled by our payment provider, and Premium turns on for your account as soon as payment completes.

Use Manage Billing on the pricing page or the link in your receipt email. Premium stays active until the end of the period you already paid for, then your account returns to the limited tier. Nothing you saved is deleted.

Sales are generally final because access starts right away. If something is not working for you, contact us and we will review it.

Formulas are based on publicly accepted mathematical equations, industry standards, financial principles, engineering references, or official documentation whenever applicable.

Different calculators may use different assumptions, rounding methods, tax rules, currencies, regional standards, or updated formulas. Always review each tool's assumptions before comparing results.

No. Financial tools are provided for educational and informational purposes only. They should not replace advice from licensed accountants, financial advisors, or legal professionals.

MonsiTools supports current versions of Chrome, Edge, Firefox, Safari, and other modern Chromium-based browsers.

Performance may be affected by your internet connection, browser extensions, device performance, or temporary server load. Refreshing the page usually resolves temporary issues.

No. All tools run directly in your browser without requiring software installation or plugins.

A REST endpoint, POST /api/calculate, that lets your own code send inputs for one of our math calculators and get the result back as JSON, with no page, iframe, or browser involved. Built for internal dashboards, automations, or your own product features.

It's a Premium feature, separate from the free embed widget, which renders a visual calculator on your site instead of returning raw data.

Send an Authorization: Bearer <Clerk session token> header from a signed-in Premium account. Requests without a valid token return a 401, and requests from a signed-in but non-Premium account return a 403 with a message pointing to the upgrade page.

POST to /api/calculate with a JSON body containing slug (the tool's URL slug) and inputs (an object of input-id to value):

curl -X POST https://monsitools.com/api/calculate \
  -H "Authorization: Bearer <your API key>" \
  -H "Content-Type: application/json" \
  -d '{"slug":"mrr-calculator","inputs":{"number_of_customers":"240","arpu":"49"}}'

A successful response looks like {"ok":true,"slug":"mrr-calculator","result":11760}. Find a tool's slug in its URL, e.g. monsitools.com/ mrr-calculator. The full list of tools and their input ids is at /api-tools.json, and a machine-readable reference is at /openapi.json (OpenAPI 3.1).

Yes. The API allows 60 requests per minute per account (429 if exceeded). Only "math mode" calculators are available via API for now, 769 of our 1,262 tools. Calling an unsupported tool returns a 404 with an explanatory message rather than a wrong or silent result.

Absolutely. We welcome suggestions for new calculators, generators, converters, and productivity tools. User feedback helps determine which tools we build next.

If you discover incorrect calculations, broken functionality, or unexpected behavior, please contact us with the tool name, your inputs, and a description of the issue so we can investigate.

New tools and improvements are released regularly. Our goal is to continuously expand the platform while improving speed, usability, and accuracy.

No. While we make every effort to ensure our tools are accurate and up to date, we cannot guarantee that every result is free from error. Users are responsible for verifying important calculations before making significant decisions.

Yes. Unless otherwise stated for a specific tool, MonsiTools may be used for both personal and commercial purposes.

The website, branding, design, source code, and original content are protected by applicable intellectual property laws. You may use the tools freely, but copying or redistributing substantial portions of the website without permission is prohibited.

You can reach us through our Contact page for general inquiries, partnership opportunities, business requests, or technical support.

We aim to respond to most inquiries within 1–3 business days. Response times may vary depending on the volume and complexity of requests.

We're always happy to help. If you can't find the answer you're looking for, please contact us and we'll do our best to assist you as quickly as possible.