Organize, verify and share your research sources

A free, open tool for researchers, journalists, and anyone who needs to track and cite their sources with precision. Driven by contributions from donors.

S3 File Storage

Secure cloud uploads

Reference Pointers

Link sources precisely

Citation Formats

APA, Harvard, MLA, Chicago

XML Import/Export

AI & tool integration

Public Sharing

Share verified research

Features

Source Chain

Linear reference tracking
Trace a single claim back through each supporting source.
Sequential flow
Reference linking
Citation export

Source Tree

Hierarchical organization
Branch out from a primary source through multiple reference points.
Topic branches
Multiple sources
Visual overview

Generate a source chain from an AI prompt — no sign-in required.

Source.io — Professional reference management for researchers and journalists.