If you're referring to app as in broker, then Tiger Brokers or Interactive Brokers are pretty good. Low trading comms, good FX spread, fast account approval (1 day). You can check out a full comparison of brokers that I wrote here!
If you're referring to tools, tradingview is good for charting. Finviz and Morningstar are also reliable resources for fundementals, with Finviz incorporating a bit of technicals. Webull is also good to track live prices on mobile or desktop.
If you're referring to app as in broker, then Tiger Brokers or Interactive Brokers are pretty good. Low trading comms, good FX spread, fast account approval (1 day). You can check out a full comparison of brokers that I wrote here!
If you're referring to tools, tradingview is good for charting. Finviz and Morningstar are also reliable resources for fundementals, with Finviz incorporating a bit of technicals. Webull is also good to track live prices on mobile or desktop.