Spark / Readdle. Not a unicorn, but I've been a happy user for years.
(Their response to a customer-service request a year or so ago was sobering. Along the lines of "yes, that's a bug we know about, but the developer who owns that feature lost his home in a missile strike last week. Once he's got housing and a new laptop he'll fix it." A week later he fixed it.)
(Their response to a customer-service request a year or so ago was sobering. Along the lines of "yes, that's a bug we know about, but the developer who owns that feature lost his home in a missile strike last week. Once he's got housing and a new laptop he'll fix it." A week later he fixed it.)