An AI research and citation assistant, browser extension plus web app, for students and researchers, now expanding into a broader product suite (Scholar, Write, Deep Research).

Paid-led, running an always-on ad machine layered on top of a large legacy organic/brand base.

~6.87M monthly visits (-1.3% over the last 3 months) and roughly 154 active paid ads across Google and Meta as of 2026-07-17, atop a reportedly ~$36.4M raised through an October 2024 Series B2.

the growth team was compounding premium-user growth by more than 17% weekly, a metrics-driven habit from the product's earliest highlighter-extension days.

As of 2026-07-17, Liner is running new video-format Google ads (first shown 2026-07-02) and fresh Meta creative pointing to scholar.liner.com (newest as of 2026-07-16).

Liner's organic strength is almost entirely brand-term capture from a decade of browser-extension distribution, so today's growth is bought through a 150-plus-ad paid machine that funds new product lines rather than earned through a content-SEO engine.