Dukto is malware, and should not be in Dukto store.
app is clearly derived from the this app source code. the this app source code is released under the GNU open source license.
app includes ads, from unidentified network sources. unknown if the ads are masking spyware. injecting ads in GPL source code is insulting, if not a direct violation of the GPL.
no source code for the IOS version appears to be available for download and review, and for further development fair use under the GPL. this is a clear violation of the GPL.
app includes a listed readme.pdf file, and can be opened by Dukto . this implies Dukto contains a PDF reader, which may or may not have security issues of its own.
Dukto does not include any information on the network protocols and UDP/TCP sockets used in Dukto . along with the text readme file warning that Dukto is not secure, this leads one to be worried that Dukto may not only be insecure, it may in fact be malware, and could harm your device.
the same appstore owner also sells a paid version of Dukto . if the paid app code is based on the GPL code, this appears to be a violation of the GPL. the IOS source code needs to be released.
I would recommend all users review the original GPL this app application, and await a legitimate and legal GPL IOS version to be released. this version does not comply with the GPL, and appears to be malware masquerading as an IOS app.