# Category 18 — Commercial Humanizer Tools

This category covers the commercial AI-humanizer product landscape as it stood in April 2026: peer-reviewed audits of named products, affiliate and independent review coverage, open-source clones and reverse-engineering projects, a vendor catalog of ~30+ live products with pricing and API details, and user-facing forum discourse. It does not cover detection models as primary objects (those live in sibling categories on detectors and watermarking), or multi-modal humanization beyond voice-agent SSML.

## Angle Files

- [A-academic.md](A-academic.md) — 20 peer-reviewed and preprint sources that directly audit named commercial humanizers: DAMAGE's 19-product COLING 2025 audit, Epaphras & Mtenzi's head-to-head ADR numbers, research humanizers (Adversarial Paraphrasing, AuthorMist, MASH, HUMPA, Nicks et al.), and academic-integrity / ESL-fairness studies from education journals.
- [B-industry.md](B-industry.md) — 30+ industry blogs, affiliate roundups, and independent head-to-head reviews surveyed and tagged vendor vs affiliate vs independent; surfaces the marketing-vs-reality claim gap and the notable absence of mainstream tech press from the category.
- [C-opensource.md](C-opensource.md) — 30 public GitHub repos cataloged across five archetypes (full-stack apps, self-hosted APIs, CLIs, browser extensions, research/adversarial code); maps the three-tier technique stack and documents the BYOK/local-LLM/Ollama dominance.
- [D-commercial.md](D-commercial.md) — 34-product vendor catalog with pricing tiers, API schemas, claimed techniques, and independent-vs-vendor detection scores; includes pricing patterns, per-1K-words API economics, and 13 product-surface technique patterns. Updated April 2026: adds Ryter Pro, Walter Writes AI, GPTHuman.ai; updates Undetectable.ai, StealthGPT, WriteHuman, HIX Bypass pricing; adds Turnitin August 2025 + February 2026 counter-move impact data.
- [E-practical.md](E-practical.md) — 18 Reddit, Hacker News, GitHub Issues, and press sources covering user-reported detector scores, hidden pricing traps, offensive vs defensive user segments, the community ethical spectrum, and Turnitin/GPTZero arms-race moves.

## Synthesis & Legacy

- [SYNTHESIS.md](SYNTHESIS.md) — the distilled synthesis across all five angles
- [INDEX.md](INDEX.md) — legacy category summary, superseded by SYNTHESIS.md, preserved for traceability
