Launch on Watch
Directory and weekly launch board for Apple Watch apps
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CompareLaunch on Watch vs SignValid
Both launched on ProductsFarm. Here they are side by side, from their listings: pricing, platforms, launches, upvotes and the people who make them.
Directory and weekly launch board for Apple Watch apps

Checks digital signatures on Indian government PDFs against India's CCA root
Based only on the facts above. Try both before you decide.
Both are in Consumer apps and Productivity. Both offer a web app.
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ihateimg.cv vs SignValid
FindUpApp vs SignValid
Logfolio vs SignValid