This app was first launched on 15th May 2019 and currently has more than 5000 downloads, a 4.4 stars rating from 73 users and the latest APK (version 2.0.2) was from 29th April 2020.
We found these ways of contacting the developers:
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The following Analysis is not a full code review! We plan to make code reviews available in the future but even then it will never be a stamp of approval but rather a list of incidents and bad coding practice. We cannot find and tell you all the dark secrets the wallet providers might have.
Do your own research!
Try out searching for "lost bitcoins", "stole my money" or "scammers" together with the wallet's name, even if you think the wallet is generally trustworthy. For all the bigger wallets you will find accusations. Make sure you understand why they were made and if you are comfortable with the provider's reaction.
This app’s description contains
Users’ self-control for private key to manage assets
which sounds like a claim to being non-custodial.
Also on their FAQ we read:
Is my digital assets safely stored in ViaWallet? ViaWallet is a subsidiary brand of ViaBTC, which was founded in May 2016 as an innovation-intensive startup dedicated to cryptocurrency with rich technological prowess and experience in global operation of blockchain industry. With the most state-of-the-art Fintech, we aims to provide a self-controlled and easy-accessible multi-cryptocurrency wallet across devices, safeguarded with industry-leading security for your digital assets.
which says “self-controlled” but nowhere do we find a hint at this wallet’s source code. We assume it’s claiming to be non-custodial but remain with the verdict: not verifiable.
Not verifiable: No Source Code found
This verdict means that we could not find any source to compile the app from. Internally the company might do everything right but as we can't verify it, there is nothing protecting the user from an exit-scam where the provider releases an app that leaks the keys to the servers.
The app cannot be independently verified. If the provider puts your funds at risk on purpose or by accident, you will probably not know about the issue before people start losing money. If the provider is more criminally inclined he might have collected all the backups of all the wallets, ready to be emptied at the press of a button. The app might have a formidable track record but out of distress or change in management turns out to be evil from some point on, with nobody outside ever knowing before it is too late.