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I'm using IB and Tradier. For a month I had the Tradier/Tradehawk combo but didn't find the Tradehawk platform worth paying extra $50. The mobile app is useless. The desktop pp looks decent but in practice it's not better than the web interface (Dash) for my purposes. I run Tradier in a browser on my phone, more or less the same as on the desktop. The main problem with Tradier is that I cannot see the "true" bid/ask spread when I place an order. The bid/ask spread in IB is tighter and appears to be more real. So, before I place any order with Tradier I enter it first in IB (with, say, buy $0.01 order) to be able to see the spread and the last price. Then I enter and subsequently modify the order in Tradier by consulting IB. After the order is executed, I keep the $0.01 version of this order in IB to track its performance and to have an idea at which point to close the position in Tradier. It's a bit cumbersome but less than it appears.

I have used IB, but switched to TW and am currently using Tradier/Tradehawk and TW. If you travel a lot and need mobile access, I would probably avoid Tradier, the tradehawk mobile app is nowhere near as intuitive and easy to use as either the IB or TW versions. The desktop app is actually not bad, although the IB version is much better.