MonsiTools
Build calculators in plain words, chain them into workflows
SubscriptionNoCodeWorkflow automationOther2 impressionslaunches Dec 251 comment
Comments
>log in to commentHey everyone, I'm Raian, the maker. I built MonsiTools because real money decisions take several calculations in a row, and copying numbers between calculator tabs is where mistakes happen. You type a formula in plain words, get a calculator, and chain it into a workflow. Devs can hit the same calculators through the JSON API or the remote MCP server. Would love your feedback, especially on the formula parser.
MonsiTools is a calculator and workflow builder. Type a formula in plain words, like price - product cost - shipping, and each word becomes a labelled field with a live preview.
Chain your calculators with any of 1,262 ready-made ones into a workflow where each answer carries into the next step: MRR into runway into valuation, or ad spend into ROAS into break-even. Compare scenarios, run sensitivity checks and export a run as a PDF report.
For developers: a JSON API and a remote MCP server at https://monsitools.com/mcp (search_calculators, describe_calculator, calculate) let Google Sheets, Zapier and AI assistants like Claude and ChatGPT run the calculators directly.
MonsiTools lets you create plain-text calculators and chain them into multi-step workflows.
- for
- Product managers, founders, freelancers and anyone needing quick financial or operational calculations.
- pricing
- freemium
Key features
- One-line calculator builder — Type a formula in plain words; each word becomes a labelled input field with live results.
- Ready-made calculator library — Access 1,262 pre-built calculators across finance, ecommerce, HR and more.
- Workflow chaining — Link any calculators so each answer feeds the next step, with unlimited steps in Premium.
- PDF decision reports — Export an entire workflow run with inputs, results and assumptions as a branded PDF.
- CSV batch mode — Run a calculator over every row of a spreadsheet in one operation (Premium).
- JSON API & MCP server — Programmatic access for Google Sheets, Zapier and AI assistants like Claude and ChatGPT.
- Workspace variables — Save a value once and reuse it across multiple calculators in a workflow (Premium).
- Local privacy — Calculations run in the browser; values never leave the user’s device.
Use cases
- Calculate SaaS runway, valuation and MRR in a single workflow.
- Compare job offers by converting salary, bonus and benefits into take-home pay.
- Determine eCommerce product landed cost, fees and net profit across marketplaces.
- Run AI token-cost vs. model-switching scenarios to control LLM expenses.
- Generate a PDF report of a multi-step financial decision for stakeholder review.
MonsiTools pricing
- Weekly$2.49/week/weekShort-term projects · Cancel anytime
- Monthly$5.49/month/monthMost common choice · Unlimited use
- Yearly$44.99/year/year~$3.75/month · 32% discount
MonsiTools vs alternatives
 MonsiTools |  Zapier |  Make |  n8n |  ToolJet | |
|---|---|---|---|---|---|
| Best for | Plain-text calculators linked into workflows | General no-code automation | Visual workflow builder | Self-hosted automation | Internal low-code apps |
| Pricing | Freemium | Subscription | Subscription | Subscription | Free |
| DevHunt upvotes | 1 | 0 | 0 | 0 | 0 |
| Launched | Dec 2029 | — | — | — | — |
- MonsiTools vs Zapier: Zapier automates across apps but doesn’t provide built-in financial calculators.
- MonsiTools vs Make: Make focuses on visual workflow automation, lacking plain-text calculator creation.
- MonsiTools vs n8n: n8n offers self-hosted workflow automation without the ready-made calculator library.
- MonsiTools vs ToolJet: ToolJet is a low-code internal-tool platform, not a calculator-centric workflow tool.
MonsiTools FAQ
How many free calculator uses do I get?+
15 uses without an account, or 25 per month after signing in.
When do free uses reset?+
On the first day of each month (UTC). Unused uses do not roll over.
Can I cancel my Premium plan anytime?+
Yes, you can cancel via Manage Billing; access remains until the paid period ends.
Do you see the numbers I type?+
No. Calculations run locally in your browser; the server only checks usage limits.
What does Premium add?+
Unlimited calculator and workflow runs, custom workflows, up to 100 personal calculators, PDF exports, CSV batch mode, workspace variables and a private JSON API key.
Is there a refund policy?+
Sales are generally final, but you can contact support for review if the product isn’t working for you.
Summarized by DevHunt from monsitools.com · Oct 2, 2026. Details may change; check the official site.
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