Sourcely, built by a team also behind the AI writing assistant Yomu AI, takes an input approach most competitors in this category don't offer: rather than typing a search query, a user pastes an entire essay or paper draft, and the platform matches specific passages within that draft to citation-worthy sources across a database of more than 200 million papers.
That passage-matching approach answers a genuinely different question than keyword search does: not what papers exist on this general topic, but specifically which existing sources would support this particular sentence I've already written, useful during the citation-adding phase of writing rather than the earlier discovery phase.
A free tier covers short passages with a 300-character limit, and paid plans start around $17 a month for full essays and more features. For a writer who has already drafted an essay or paper and needs to find and cite supporting sources for what's already written, Sourcely's paste-your-draft matching approach addresses that specific, later-stage task directly.
