ScaleSparrow Drawing & model scale calculator
AI-generated Convert real and model lengths at a chosen scale, compare ratios, and switch metric or imperial units.
Screenshots
Screenshots supplied by the seller.
Description
AI generated by Codex for Shai. A linear scale-length calculator for model makers and drawing work, with real-to-model and reverse conversion, metric/imperial units, decimal and fractional inputs, enlargement ratios, comparison bars and TXT export.
The hosted demo works in memory only because its sandbox disables storage. Export a JSON backup to retain edits across reloads. The delivered source supports browser-local persistence on a regular static host.
Buyer receives editable source, core tests, documentation, and deployment setup. Private source handover is arranged by the seller; no hosting account or ongoing support is included.
Condition
Development stage: Working prototype (seller-declared)
Seller-declared: provided by the seller, not independently verified by SellMyVibe.
- Solo creator
- Mainly AI-generated
- Under one month in development
- Tests included
- Setup guide included
- Demo available
What works
- Convert linear lengths between real-world and model/drawing dimensions
- Use millimeters, centimeters, meters, inches, or feet in either direction
- Enter nonnegative decimals, fractions, or mixed fractions
- Set drawing:real ratios for reduction or enlargement and compare six common ratios
- Choose displayed decimal precision and export a TXT calculation
- JSON backup/import; hosted demo works in memory without network requests
What’s unfinished
- Linear lengths only; no area/volume scaling, printer calibration, paper fitting, or engineering tolerances
- Floating-point calculations with rounded decimal output; decorative ruler and comparison bars are not physical measurements
- One unit per input; feet-and-inches notation and fractional output are not supported
- Ratios require whole positive values; numerator up to 1,000, denominator up to 1,000,000
Included assets
Full source code
Documentation
Deployment setup
Test suite
Technologies
HTML5, CSS3, Vanilla JavaScript ES modules, Browser localStorage (standalone source only)
Setup requirements
Unzip source and run python3 -m http.server 8080 in the folder. Open http://localhost:8080 or deploy to a static HTTPS host. No build or API key. Node 20+ runs test.mjs. See README.md and QA.md.
Dependencies and ongoing costs
No third-party libraries, APIs, backend, external fonts, images, or paid subscriptions. Hosted demo is served by SellMyVibe. Standalone source requires a static HTTP/HTTPS host, which may be free within provider limits; paid plans, overages, and custom domains may cost extra.
Known limitations
Working prototype. Linear lengths only; no area/volume scaling, printer calibration, paper fitting, or engineering tolerances. Floating-point calculations with rounded decimal output; decorative ruler and comparison bars are not physical measurements. One unit per input; feet-and-inches notation and fractional output are not supported. Ratios require whole positive values; numerator up to 1,000, denominator up to 1,000,000. App data resets on reload in the hosted demo; export JSON backups. See the app description for standalone storage behavior. No independent security audit or broad device/browser certification.
Listings are reviewed for completeness and clarity before publication. Approval is not a guarantee of quality, ownership, security or commercial success. Read the details and ask questions before buying.