Free alternatives to OptionsDepth

• Unusual Whales – Free · paid from $42/mo – Yes: flow 2 trading days delayed, news 15 min, alerts 30 min delayed
• GEX Metrix – Free · paid from $19/mo – Yes: delayed data with intraday OI model
• Gextool (GEX) – Free – Yes, no account; 3 added tickers/day
• GammaGrid – Free – Free while in beta; open source (AGPL-3.0) self-host
• SquawkFlow – Free – Fully free, no account, no paid tier