Arbiter
See the accounts shaping your feed before they shape your views.
An AI copilot for public discourse · by SimPPL, a U.S. 501(c)(3) nonprofit
The information supply chain is broken
A lie crosses platforms faster than the truth, and no one sees the whole path.
On social platforms, true stories take about six times as long as false ones to reach people.
Public deception, deliberate and documented
Each one is a real article or public record, sourced on every card.
One tool, reading across every feed
Search the posts on every platform, aggregate the ones that move together, then investigate the accounts behind them.
Platforms act on what we surface, worldwide
X investigated. Meta took a network down. YouTube terminated channels.
Newsrooms, fact-checkers, election officials, and UN trust-and-safety teams use Arbiter. Stanford picked it for this year's platform workshop with trust-and-safety leaders.
Built by researchers who ship, backed by the field
Swapneel Mehta · Founder
Former postdoc in AI safety at MIT and Boston University. Board member at the Integrity Institute. Built AI systems at Twitter, Adobe, and Slack.
Six full-time engineers
Systems and infrastructure, NLP and agents, platform backend. A U.S. 501(c)(3) nonprofit.
Backed by
Google, Mozilla, Wikimedia, Ford, Omidyar, MIT, Columbia, and UNDP.
Peer-reviewed
Published at NeurIPS, EMNLP, ICML, AAAI, and ICWSM.
OUR VISION
Everyone who defends the truth can see the whole picture.
See it on your issue: write to team@simppl.org.
Want the depth, the methods, and the full case files? Read the full deck →