Which should you choose?
Choose Finviz if you primarily need an equity screener, stock charts, heatmaps, fundamental and technical filters, portfolio views, or a compact market-data and news interface. It is a mature, efficient surface for narrowing companies by measurable market and company characteristics.
Choose Nebula if you primarily need social stock intelligence: which companies are gaining attention, whether discussion is constructive or fearful, how a ticker compares with the market, and which narratives or source groups explain the change. It is the closer fit for researchers and agents that need structured conversation through both public pages and an API.
For a complete workflow, use both categories. Screen the financial universe, screen the attention universe, and then verify every material claim in company filings, investor-relations materials, and other primary sources. Neither a technical pattern nor a sentiment score is a complete investment decision.
Official sources reviewed
Finviz screener documentation · Finviz product updates · SEC EDGAR search · Nebula stock mindshare