I've used Zeplin on a few projects and it was a good experience.
> mockup does not quite get us there (not sure why)
I can only speak as a dev, but it's incredibly frustrating when design agencies leave out too many details or don't consistently follow guidelines. No tool is going to fix that.
On my side of the fence we generally don't care about the tools used as long as we have a completed design to look at that isn't late and isn't going to be pulled out from under us. I've seen product managers lie about all reviews being completed to "get devs started early" only to see the next revision break a ton of work. They also lie about copy text being final not realizing the impact even one word can have on everything. I've seen designers commit sins ranging from using system or licensed fonts causing them to have to rework an entire layout to not even exporting assets properly or at all before handing off to devs. If you have people like that, the back and forth and pain is endless for everyone.
> mockup does not quite get us there (not sure why)
I can only speak as a dev, but it's incredibly frustrating when design agencies leave out too many details or don't consistently follow guidelines. No tool is going to fix that.
On my side of the fence we generally don't care about the tools used as long as we have a completed design to look at that isn't late and isn't going to be pulled out from under us. I've seen product managers lie about all reviews being completed to "get devs started early" only to see the next revision break a ton of work. They also lie about copy text being final not realizing the impact even one word can have on everything. I've seen designers commit sins ranging from using system or licensed fonts causing them to have to rework an entire layout to not even exporting assets properly or at all before handing off to devs. If you have people like that, the back and forth and pain is endless for everyone.