Chainsage is described as 'provides cryptocurrency market data and a professional API' and is an website in the Bitcoin & Cryptocurrency category. There are more than 10 alternatives to Chainsage, not only websites but also apps for a variety of platforms, including Android, iPhone, Android Tablet and SaaS. The best alternative is CoinMarketCap, which is free. Other great sites and apps similar to Chainsage are Blockchain Wallet (Free, Open Source), CryptoCompare (Free), Coingecko (Free) and Coinranking.com (Free).
Blockchain is one of the few wallet applications that keeps control over your money in your own hands. In the original spirit of Bitcoin, it is physically impossible for BlockChain to "freeze" your account or any such nonsense.
CoinGecko provides a fundamental analysis of the crypto market. In addition to tracking price, volume and market capitalization, CoinGecko tracks community growth, open-source code development, major events and on-chain metrics.