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> You can also use JavaScript but you will lose a lot of performance that is very important on mobile.

I've used Appcelerator Titanium fairly extensively. The performance difference vs. native code is undiscernible. Unfortunately, JavaScript is an awful language to use, so there are tradeoffs. Maybe Titanium + TypeScript would be the sweet spot.

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It depends what you do but once you have a complex application you will see problems with JavaScript.

I've had the complete opposite experience with Titanium, to the point where it was completely unusable.

I found some things about it to be frustrating and buggy, but it was still less work than writing two different apps. My code was about 90% shared between devices.

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