If that's what you're going for, I will definitely keep an eye on your app for the future. I'm literally typing this from the gym, and there's 2 benches available for 4 people that all want to use them (me being one of them)
Aside from dumbbells; push ups with a resistance band, smith/machines, or chest press on rings/trx are good substitutes. I use a combo of all this equipment myself for push days. Enjoy your workout!