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I don't use an app. I just set up a default signature in the settings.
There are two signature you'll need to create: one for your email(s) and one for text messages. Use short cuts to create a signature for your texts.
Settings~~General~~ Keyboards~~ Shortcuts~ Add a short cut that will insert your signature.
I have an Android and do it under Settings. Some text apps also have a signature setting feature.
I just set it up on my iPhone under Settings- Mail & Contacts - Signatures, but if you want to get all fancy and add a logo and multiple fonts/bold, then just search the web for setting up your signature. You can do it in MS WORD and cut and paste it or if you are a Mac user, do it in PAGES and cut and past it.
I dont use an app, I have an iphone 6. I go into signatures and add my custom signature. Making sure I include my name, brokerage and phone number. Good luck.