I got in on the LTD last year and Zlappo has easily been one of the best purchases I've made for my Twitter accounts. Now, they're expanding to LinkedIn and Instagram.
It's an invaluable tool that keeps getting better and better. Even more, they are open to community suggestions and implement what users want regularly.
You can't go wrong with Zlappo for your automation needs. Highly recommended!
There is something sneaky and untrustworthy about the founder. Multiple changes to the deal terms led to all my clients' sub-accounts being downgraded to the free tier. Responds neither to emails nor messages.