Retraction Watch
The database of retractions — know when a paper has been pulled.
Tier 2 Open AccessFree
Research Database Directory
Every research database, reviewed.
Overton
The policy-document database — see where research shows up in government.
Tier 3 CorporateSubscription
Sciety
Preprint evaluations in one place — see which preprints experts have vetted.
Tier 3 ToolsFree
Internet Archive Scholar
Full-text search of the preserved scholarly record — including the hard-to-find.
Tier 3 Open AccessFree
Paperity
An aggregator of open-access papers — one search across gold and hybrid OA.
Tier 3 Open AccessFree
Fatcat
The Internet Archive's open catalog of scholarship — the editable backbone under IA Scholar.
Tier 3 Open AccessFree
Elicit
The AI research assistant built for evidence — search, screen, and extract at scale.
Tier 2 ToolsFreemium
Covidence
The systematic-review workflow — screening, extraction, and team collaboration.
Tier 2 ToolsFreemium
Rayyan
Fast, collaborative screening for systematic reviews — with a generous free tier.
Tier 2 ToolsFreemium
DistillerSR
Enterprise-grade systematic review automation — for audit-heavy evidence work.
Tier 3 ToolsSubscription