When comparing Zeplin vs Sympli, the Slant community recommends Zeplin for most people. In the question“What are the best tools for sharing Sketch designs with developers?” Zeplin is ranked 3rd while Sympli is ranked 4th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Quickly syncs projects from Sketch via plugins
Pro Excellent customer support
Pro Archive projects
After finishing projects, archive is available to keep the dashboard from being cluttered.
Pro Creates a style guide automatically
Pro Has a web inspector
Allows developers to see all the information they need to turn designs into code including dimensions, fonts, colors etc
Pro Syncs with sketch files
Pro Plugins for Xcode and Android studio
Plugins for Xcode and Android studio that actually help the developer and improve productivity.
Redlines that actually line up and match the interface elements you actually layout when building the app.
Colors and assets imported from stylebooks automatically.
Pro Slack & Microsoft Teams Integrations
Pro Jira Integration (both Cloud & Server)
Pro Plugin for Figma
Pro Different CSS syntaxes available
There are CSS by default but also exists: scss, less, sass, stylys
Pro Archive projects
Pro Easily shows all elements that share the same color or font
Very helpful for reusing styles across the page/site.
Cons
Con Measure between objects tool is buggy
Depending on how objects are grouped, sometimes it is impossible to measure between two objects.
Con No native linux or windows app
Con No layers sidebar
Con Cannot select groups of objects
Con Does not support revisions
Con Rough around the edges
The Xcode plugin is a bit hackish by design. It failed to parse a very large storyboard.