Ask HN: Free DJVU reader for iOS

I use iPhone 6s Plus / iOS 10 and read books a lot, on an everyday basis. Many of the books I want to read are available only in DJVU format. I tried many free apps like DjVu Reader, KyBook & TotalReader. All of these apps are based on freemium model, if I'm not wrong. KyBook lets you read free for sometime & then asks you to upgrade. Would anyone here kindly suggest some free & decent DJVU readers available on the AppStore, preferably those which have been tried & tested by HN users? Any suggestions would be highly appreciated. Thanks :)