|Founder(s)||Peter Sunde and Linus Olsson|
|Slogan(s)||We aim to make people share money on the internet.|
Flattr is a project started by Peter Sunde and Linus Olsson. Users are able to pay a small amount every month (minimum 2 euros) and then click Flattr buttons on sites to share the money they paid among those sites, comparable to an Internet tip jar. (The word "flattr" is used as a verb, to indicate payments through the Flattr system-so when a user clicks a Flattr button and they are logged in to the Flattr site, they are said to be "flattring" the page they are on.) Sunde said, "We want to encourage people to share money as well as content."
In the beginning of the service, Flattr itself takes 10% of all the users' monthly flatrate, although this fee may be reduced at a later date if the economics permit it.
On 28 April 2011, Flattr announced by email that they would not require users to flattr others before they could be flattrd themselves, starting from 1 May 2011.
On the 16th of April 2013 twitter announced that they would no longer allow Flattr users to Flattr favorites citing commercial confusion problems they believed would occur between users.
As the service relies on network effect to prove useful, it is necessary that users join and have the opportunity to flattr and be flattr'd. A wide number of platforms are supported including WordPress, Blogger, and Joomla among many others. To foster faster adoption, including on sites that may not natively support Flattr, a Firefox plugin, Överallt ("everywhere" in Swedish) has been developed. It allows the equipped browsers to parse a simple plain-text tag (
[Flattr=ID]) and replace it inline with the Flattr widget. This extends the range of Flattr, so that not only sites that support Flattr, but all sites, can have Flattr buttons.
For real-world or non-web content 
Flattr is also being demonstrated as being useful for micro-donations to offline content, including those which are non-computer based, by way of mobile device recognition of QR codes. A number of existing services exist to allow for the "flattr-ing" of non-web-based content, including offline content, using many smartphones' capability of recognizing physical QR codes. Utilizing QR codes attached to Flattr buttons allows for donations to the specific physical or non-web-based item of choice.
Adding funds 
Adding money to a Flattr account, and withdrawing revenue from a Flattr account can be done via PayPal, Moneybookers, several credit cards (including Visa, EC and MasterCard) and other methods. As of December 2012, Bitcoin is being considered as a payment option.
Corporate affairs 
- Best New Startup in 2010 - TechCrunch Europe.
- Hoola Bandoola Band award.
- Top-10 in Netexplorateur 2011.
See also 
- "Flattr secures $2.1 million in venture funding". Financial Deals Tracker. 16 February 2012.
- "Pirate boss to make the web pay". BBC News. February 12, 2010. Retrieved May 2, 2010.
- Steve O'Hear (August 12, 2010). "Flattr opens to the public, now anybody can 'Like' a site with real money". TechCrunch Europe. Retrieved August 13, 2010.
- Flattr now open for everyone!
- Butcher, Mike (2010-12-08). "WikiLeaks continues to fund itself via tech startup Flattr". Eu.techcrunch.com. Retrieved 2012-02-03.
- Linus Olsson (16 April 2013). "Twitter is forcing us to drop users ability to flattr creators by favoriting their tweets". Flattr blog.
- da Silva, Paul (June 19, 2010). "Överallt : Flattr Everywhere !". Retrieved June 22, 2010.
- "Offline Flattr".
- "'Cat’s out of the bag – yes, Flattr now has investors'". FlattrBlog. Retrieved 22 March 2013.
- The Europas European Startup Awards 2010 - The Winners and Finalists
- Hoola Bandoola Band-award - Flattr blog
- Hoola-pris till bloggstöd (swedish)
- NetExplorateur - 2011 award winners