crypto arbitrage scanner

Hey all im not sure if this is the correct place to post this but im an app developer and i had a client had contacted me requesting me to build them a arbitrage scanner it was a very complex project and i built the basics of it it works great the only thing lacking is the front end desgin of the app after some months of working with the dude he pulled out and no longer wanted the app its still fully functional and everything i was wondering where i could sell it off as i put in too much work just to make nothing from it

im not sure if this is the wrong place to post it but ill give it a shot lmk if i should go else where to sell this app off tho