Broete
II Tools
Two tools · each with one purpose

The tools
in use.

Two small bridges for two different contexts. Each tool is a self-contained HTML file that runs locally — no cloud storage, no account. You buy it once; it's yours after that.

In use Kolumna
In progress OneCalc
Tool I · In use

Kolumna

Excel in. A shareable dashboard out — one HTML file, fully local.

Kolumna is a tool for anyone who has an Excel or CSV file and wants to see it as more than numbers in cells. Paste or upload your data, choose charts, adjust colours and layout — and get a self-contained HTML dashboard you can share, email or put on an intranet.

Your end user can also rearrange sections and resize them when they open the dashboard. The layout is saved locally so the file looks the same the next time it's opened. All without a single byte leaving the browser.

For
Small business owners, consultants, treasurers, communicators
Price
One version — USD 19, one-time purchase
Platform
One HTML file. Opens in Chrome, Firefox, Safari. Works offline.
Language
Swedish and English, in parallel
Status
Version 0.3 — launching summer 2026
See demo Write about Kolumna
Tool II · In progress

OneCalc

Build your own calculator — no code, no cloud, no account.

OneCalc is a self-contained HTML builder for calculators and quoting tools. Same principle as Kolumna: your data, local, a file you can share. Think ROI calculator, price list, quote builder, mortgage calculator — all built by you, without code.

It reuses the core of Kolumna: the same parser, the same colour system, the same drag-and-drop. The difference is the output — not a dashboard, but a calculation tool — embeddable where you need it.

For
SaaS sales, freelance consultants, treasurers, communicators
Price
Planned: one version — USD 19, one-time purchase
Platform
One HTML file. Possibly embeddable.
Language
Swedish and English
Status
Concept complete. Development starts September 2026. Beta November 2026. Public launch January–February 2027.
Notify me at launch
III Principles
What's true of every tool

Three principles, never four.

One purchase

Buy once. Use forever. No subscription, no creeping price hikes, no features that suddenly disappear behind a paywall. If you ever pay for an upgrade, it's because you wanted to.

Local

All processing happens in your own browser. No accounts, no cloud storage, no logins. Your files never leave your computer. Your data stays yours.

Self-contained

The output is a single HTML file. You can share it, email it, put it on an intranet, open it ten years from now. It needs no account, no server, no subscription — just a browser.

Contact

Questions about a tool? Get in touch.

Email is the best way — for demo requests, collaboration, an idea you think belongs here, or a price that doesn't fit your situation.

Email [email protected]
Reply within 2–3 business days
Status Open to new conversations