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This table compares the features of the different clients. All of the listed clients are open-source.

Feature key

Wallet Security 
How well the client protects your private keys from people with access to the machine the wallet is stored on. The private keys can be encrypted, for example.
Network Security 
Clients which more fully implement the Bitcoin network protocol are safer -- they can't be as easily tricked by powerful attackers. A client which fully implements the protocol will always use the correct block chain and will never allow double-spends or invalid transactions to exist in the block chain under any circumstances. Clients which only partially implement the protocol typically trust that 50% or more of the network's mining power is honest. Some clients trust one or more remote servers to protect them from double-spends and other network attacks.
Setup Time 
Some clients require that you download and verify a large amount of data before you can send or receive BTC.
When the project was started.


Client Get Started Audience Wallet Security Network Security Backups Setup Time Disk Space Maturity Multi-user Available for
Armory Download Power users Encryption Addon One-time Varies 2+ GB Jul 2011 Multi-wallet Ico-linux.pngIco-win.png
Bitcoin Wallet Download End-users Isolated Partial Manual 1 hour 30 MB Mar 2011 No Ico-android.png
Bitcoin-Qt Download End-users Encryption Full Manual Hours 2+ GB May 2011 No Ico-linux.pngIco-mac.pngIco-win.png
bitcoind Download Programmers Encryption Full Manual Hours 2+ GB Aug 2009 Virtual accounts Ico-linux.pngIco-win.png
Electrum Download Power users Encryption Minimal Memorized Minutes 5 MB Nov 2011 No Ico-linux.pngIco-win.png
MultiBit Download End-users None Partial No 1 hour 50 MB Jul 2011 Multi-wallet Ico-linux.pngIco-mac.pngIco-win.png
My Wallet eWallet Everyone Encryption Remote Automatic Minutes None Dec 2011 Yes Ico-android.pngIco-ios.pngIco-linux.pngIco-mac.pngIco-win.png

For developers

This table shows additional information about various Bitcoin clients that may be relevant to developers.

Client Website Source Code License Discussion Architecture
Armory Link Github AGPLv3 Bitcointalk Integrated
Bitcoin Wallet Link Google Code GPLv3 None / Google Groups SPV
Bitcoin-Qt / bitcoind Link Github MIT Sourceforge Integrated
Electrum Link Gitorious GPLv3 Sourceforge Server-Client
MultiBit Link Github MIT Google Groups SPV
My Wallet Link Github BSD* None Server-Client