source-lm vs Web4 Browser

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 Web4 Browser
Detail	source-lm	Web4 Browser
What it does	Chrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages	AI antidetect browser and multi-account workspace with true-to-device browser identity
Stage	Not given	Not given
Founded	Not given	Not given
Based in	ES	HK
Pricing model	Paid	Freemium
Pricing	Free plan: 5 bulk actions per month, single sources always free. Pro licence: $29 one time, unlimited bulk runs.	Free plan includes 3 browser environments with no team members. Starter at $9/month provides 15 environments. Small Team at $19/month includes 1 team member and 55 environments. Popular at $39/month includes 2 team members and 125 environments. Scale Team at $69/month includes 4 team members and 250
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	Isolated browser profiles with persistent identity and session data Real-device fingerprinting and AI environment modeling Per-profile proxy and network configuration Browser automation with visual workflows and headless execution Team permissions, roles, and activity logging AI browser workflows and MCP skill integration Multi-environment grouping and workspace organization Profile template copying and batch creation
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	Real-device signals and AI environment modeling instead of manual parameter mixing Isolated execution boundaries with team-level access control and activity logging Unified workspace for profiles, proxy routing, automation, and team handoffs
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	44 no change since last check
Trust Flow (Majestic)	18	8
Citation Flow (Majestic)	15	26
Referring domains (Majestic)	24	54

6 details filled in for both companies.

More alternatives to source-lm More alternatives to Web4 Browser