# SaunaPlungeHub.com
> Independent review and comparison hub for saunas and cold plunges.
> No brand pays for placement or score improvement. Matrix Trust Scores
> calculated from ratings, review volume, active offers, certifications,
> and warranty length.

## Saunas
- [All Saunas](https://saunaplungehub.com/sauna.php): Infrared, traditional, and portable saunas
- [Sauna Finder](https://saunaplungehub.com/find.php?niche=sauna): Matched to space, budget, and goals

## Cold Plunge
- [All Cold Plunges](https://saunaplungehub.com/plunge.php): Chiller tubs, ice baths, and portable plunges
- [Plunge Finder](https://saunaplungehub.com/find.php?niche=plunge): Matched to space, budget, and goals

## Contrast Lab (shared hub)
- [Contrast Lab](https://saunaplungehub.com/contrast.php): Interactive protocol builder, curated protocols
- [Build Logs](https://saunaplungehub.com/build-logs.php): Real DIY sauna/plunge builds — costs, timelines, materials

## Brands & Products
- [All Brands](https://saunaplungehub.com/brands.php): Independently scored sauna and cold plunge brands
- [All Products](https://saunaplungehub.com/products.php): Full catalog with specs, scores, and reviews
- [Brand Comparisons](https://saunaplungehub.com/compare.php): Brand vs brand, side by side
- [Product Comparisons](https://saunaplungehub.com/find.php?mode=compare): Product vs product, side by side (same category only)
- [Trust Leaderboard](https://saunaplungehub.com/leaderboard.php): Live brand ranking

## Coupons
- [Coupons & Deals](https://saunaplungehub.com/coupons.php): Verified discount codes updated regularly

## Blog & Research
- [Blog](https://saunaplungehub.com/blog): Guides, buying advice, and editorial content
- [Science Index](https://saunaplungehub.com/science.php): Peer-reviewed heat and cold exposure research
- [Glossary](https://saunaplungehub.com/glossary.php): Sauna and cold plunge terminology, defined clearly

## Data APIs (machine-readable)
- [Brands JSON](https://saunaplungehub.com/api/brands.json): Live brand data
- [Products JSON](https://saunaplungehub.com/api/products.json): Live product data
- [Comparisons JSON](https://saunaplungehub.com/api/comparisons.json): Brand comparison data
- [Studies JSON](https://saunaplungehub.com/api/studies.json): Science index
- [Sitemap](https://saunaplungehub.com/sitemap.php): Full site index

## Methodology
- [About & Methodology](https://saunaplungehub.com/page/about): Matrix Trust Score methodology and editorial standards
Our Matrix Trust Score (0-100) is calculated from:
- Product rating quality (up to 60 points): average star rating scaled
- Review volume confidence (up to 20 points): log-scale from verified reviews
- Active offer activity (up to 10 points): current verified discount codes
- Certification & warranty (up to 10 points): independent safety certifications and warranty length
Scores update automatically. No editorial override without disclosure.

## Cross-therapy pairing
Every sauna and cold plunge product page shows a themed panel recommending
a matching product in the opposite category (matched by price tier and
indoor/outdoor space), since the two are complementary, not competing —
they are never presented as a "vs" comparison against each other.

## Structured Content
- Brand pages have Brand schema (schema.org)
- Product pages have Product + AggregateRating + Review schema
- Comparison pages have FAQPage schema with auto-generated answers
- Glossary terms have DefinedTerm schema (DefinedTermSet)
- Science studies have ScholarlyArticle schema

## Licensing
Content may be cited with attribution to SaunaPlungeHub.com.
Raw data API endpoints are freely accessible for non-commercial use.