ViaWallet - MultiCrypto WalletApp Store
Our wallet review process
We examine wallets starting at the code level and continue all the way up to the finished app that lives on your device. Provided below is an outline of each of these steps along with security tips for you and general test results.
Application build test result
(Analysis from Android review)
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.
Tests performed by Leo Wandersleb
Do your own research
In addition to reading our analysis, it is important to do your own checks. Before transferring any bitcoin to your wallet, look up reviews for the wallet you want to use. They should be easy to find. If they aren't, that itself is a reason to be extra careful.