WindowCalc · Free & Open Source

Free on GitHub. Yours to take apart.

Public Domain · Unlicense

Our original platform: multi-company quoting with margin governance, manager approvals, NOA checks, county property lookups, and an offline mobile field app. We released the entire codebase into the public domain on GitHub for anyone in the trade to use, study, or build upon.

Get WindowCalc on GitHub →Read the lesson
Backend
~17,700lines in one Flask backend
Routes
190API routes
Tables
45database tables
Cost
Freefree forever on GitHub

Platform Capabilities

Everything built into the public domain repository.

Margin governance

A green, yellow and red stoplight against floors each company set, with manager approval below the floor.

DP and NOA checks

Flagged a risky opening red, but never blocked the rep from saving. The field always finishes; the office corrects.

County lookups

Owner, folio and building details pulled from South Florida county property appraisers to pre-fill a job.

Job chat and texting

Customer texts and job photos threaded into the quote, with internal notes kept apart.

Proposal links

Tokenized, expiring links a customer could open without a login, with views tracked.

Offline field app

Pulled a fresh pricing bundle every fifteen minutes, queued changes offline, and priced with the same math as the server.

The Architectural Lesson

Why we retired WindowCalc and built Quote Converter Pro™.

WindowCalc proved that quoting software for this trade is possible, and it taught us what dealers really need next.

Everything we learned went into Quote Converter Pro™, part of the EWD Suite.

View the code on GitHub →

Open source

WindowCalc’s full source is public on GitHub under the Unlicense. Use it, fork it, learn from it.

Get started

Need modern quoting with up-to-date manufacturer matrices?

Explore Converter Pro: the next generation CPQ engine with margin floors your reps can't discount past.

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