source-lm vs HighlightGPT

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

source-lm compared with HighlightGPT
Detail	source-lm	HighlightGPT
What it does	Chrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages	A browser extension that lets you ask, explain, translate, and memorize from highlights using ChatGPT's native responses
Stage	Not given	Not given
Founded	Not given	Not given
Based in	ES	Not given
Pricing model	Paid	Not given
Pricing	Free plan: 5 bulk actions per month, single sources always free. Pro licence: $29 one time, unlimited bulk runs.	Free: $0/Lifetime includes highlight toolbar inside ChatGPT, ask/explain/translate, view answers in side panel, manually save to ChatGPT memory. Pro: $8/Lifetime adds remove ads, unlimited saving to ChatGPT memory, priority support, early access to new features.
Key features	Split JSON exports into Markdown files with 400,000-word budget Filter sources, detect duplicates, and batch delete Incremental uploads skip already-added content No account or login required Source-available code published unminified No data written to disk or stored on servers Supports Telegram Desktop and Telegram for macOS exports	Highlight toolbar inside ChatGPT Ask questions directly from highlighted text without retyping Translate ChatGPT replies while preserving tone and nuance Save important answers to ChatGPT memory Context-aware replies in side panel Zero extra tokens usage
What makes it different	No backend or recurring costs: pay once, keep the licence forever Runs entirely in your browser with no account or login needed Smart splitting keeps records whole and avoids duplicates on re-runs Source-available and unminified so you can audit the code yourself Extends NotebookLM's interface with bulk operations and source management tools	Zero extra tokens - no additional token usage while using ChatGPT's native responses Side panel design keeps you reading ChatGPT uninterrupted Privacy-first with answers generated only by ChatGPT
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	15 −1 (down) since last check	32 −1 (down) since last check
Trust Flow (Majestic)	18	8
Citation Flow (Majestic)	15	19
Referring domains (Majestic)	24	32

4 details filled in for both companies.

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