Pricing rules, declared — not coded.
A complete discount engine in pure Prolog, compiled to WebAssembly (Trealla). No server. No second implementation. The .pl file below is the same one running your quote.
Prolog · ISO standard
Trealla WASM
100% client-side
Offline-first PWA
Quote calculator
Pick a product and quantity. The discount rule fires inside Prolog.
Loading Prolog runtime… ⏳
Catalog (live from price/2 facts)
| Product | Unit price |
|---|
Recent quotes
The engine, verbatim (engine/pricing.pl)
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