HTML Viewer with Bidirectional Highlighting (Code ↔ Highlight Element)
Yet another online editor, but the two-way code-to-preview sync is actually useful.

Yet another highlight-to-explain extension when Readwise Reader and Glasp already exist.
Students and researchers reading technical content
Readwise Reader · Glasp · Mercury Reader
Yet another online editor, but the two-way code-to-preview sync is actually useful.
Deterministic exports for Obsidian/Logseq are the selling point: highlights are tied to source and the app promises predictable Markdown/JSON output so your notes don't become a messy graveyard. The interface shows sensible features — reader view, tag/collection organization, AI search and spaced repetition — but this lives in a crowded space (Readwise/Hypothesis/etc.) so the export schema flexibility and third-party integrations will decide whether it becomes indispensable.
Bridges three tools academics already own, zero cloud lock-in, extracts highlights via wire protocol parsing.
Yet another HN frontend with point highlighting nobody asked for.
Multi-provider AI fallback beats single-provider extensions when APIs go down.
Screen OCR search with redaction in a single Swift CLI—no dependencies beyond macOS.