be able to filter only some tags

[JLZIMMERMANN]

There was something usefull with this ability
http://demo.3liz.com/lizwatch/index.php/view/map
It doesn't work anymore but it gives some ideas.
If you want to check how it worked choose some dates between 2011 & 2012.

[nrenner]

Nice tool, haven't seen that before.

Tag filtering would indeed be useful. As achavi is based on the Overpass API, one idea would be to allow using custom Queries, maybe with some form of integration with Overpass Turbo.

Client-side filtering would be an additional option.

As a workaround for now, Overpass Turbo also supports adiff queries:

//[adiff:"2015-09-01T00:00:00Z"]; // from - now
[adiff:"2015-09-01T00:00:00Z","2015-09-08T24:00:00Z"];
(
  node[highway=bus_stop]({{bbox}})(changed);
  way[highway=bus_stop]({{bbox}})(changed);
);
out meta geom({{bbox}});

http://overpass-turbo.eu/s/bmq

[borazslo]

See my suggestion in Pull Request #18