I and a few other users are unconvinced about the security of the database, especially considering it's closed-source, so it'd be nice if a bit more was published regarding the security and if we had a few more options like other password managers do (key files, custom keys, encryption algorithms, etc).
Preston Wilson commented
It's understandable if the author wants to keep SafeInCloud as a closed source app, but it's possible to demonstrate the security through other means. A very small open-source app that would read and decrypt the database and dump its contents would allow a review of the security of the format itself (though not necessarily the security of the actual binary implementation of the main app).
Failing that, if we had a much more technical description of the data format it might allow others to build tools to analyze the database and its security.
The fact that nobody has replied to this post seems to suggest that this software is either not fully secure or that there is something wrong with it which may compromise it's security. Do not use this to store your passwords until proof of security is available.