Liner

Liner is a web-based AI research assistant for researchers, students, academics, and content creators who need faster access to trusted, citable sources.

Key capabilities include:

• Citable research search that surfaces real-time information from reliable sources and returns answers with references.
• Summarization for text, web pages, PDFs, and YouTube videos, helping users extract key points without reading everything end to end.
• Browser extension highlighting for web pages, YouTube, and images, including color-coded highlights and comments for organizing findings.
• AI agents and Copilot chats for tasks such as literature reviews, gap finding, and generating research outputs with verifiable citations (PDF copilot and file/URL upload available on the Professional plan).

Pricing: Freemium with a free Basic plan (usage limits apply). Paid tiers include Essential (about $19.58/month), Professional (about $27.08/month), and Team (custom).

What makes it notable: it focuses on delivering answer-first research with citations instead of manual filtering, and it supports both a research workspace (including tools like Literature Review and Citation Recommender) and a browser extension for capturing sources while browsing.