It's open sourced - https://github.com/tburch/jsonblob https://github.com/tburch/jsonblob. It's running on a single Heroku dyno with the free MongoHq service,

It's open sourced - https://github.com/tburch/jsonblob https://github.com/tburch/jsonblob. It's running on a single Heroku dyno with the free MongoHq service, so at some point I'll have to figure out what to do when there's more than 512MB of documents stored, but for now it's running indefinitely.