When you check an address balance or a transaction status online, which block explorer do you use ? If you run a service depending on a third party API, which block explorer's API you rely upon ?

Update: I'm listing out the outcome of this thread here...

1. https://blockchain.info/

2. https://blockr.io/

3. https://blockexplorer.com/

4. https://www.biteasy.com/

5. https://chain.so/btc

6. https://helloblock.io/

7. http://bitcoinchain.com/block_explorer

8. https://bkchain.org/btc

9. http://bitinfocharts.com/bitcoin/

10. http://www.blocktrail.com

11. http://explorer.chain.com/