Is a gem ready for Rails 4 or 5?

Rails 4: 583 ready, 38 not ready, and 435 unknown
Rails 5: 95 ready, 10 not ready, and 951 unknown
Name Status Rails 4 Notes Rails 4 Status Rails 5 Notes Rails 5 Status or notes updated
filterrific ready

https://github.com/jhund/filterrific/blob/master/CHANGELOG.md

ready

https://github.com/jhund/filterrific/blob/master/CHANGELOG.md

over 1 year ago
values ready

https://github.com/tcrayford/Values/blob/master/README.md

ready

https://github.com/tcrayford/Values/blob/master/README.md

over 1 year ago
socialization ready

since version 1.0.1

not ready

-

over 1 year ago
draper ready

-

ready

since version 3.0, see https://github.com/drapergem/draper/blob/master/CHANGELOG.md#300pre1---2016-07-10

over 1 year ago
massa ready

It doesn't depend on Rails

ready

It doesn't depend on Rails

over 1 year ago
enumerate_it ready

https://github.com/lucascaton/enumerate_it/blob/master/.travis.yml#L25

ready

https://github.com/lucascaton/enumerate_it/blob/master/.travis.yml#L26

over 1 year ago
validates_timeliness ready

Since version 4.0, see https://github.com/adzap/validates_timeliness/blob/master/CHANGELOG.rdoc#400-2015-12-29

not ready

see https://github.com/adzap/validates_timeliness/issues/143

over 1 year ago
paranoia ready

since version 2.0

ready

from version 2.2.0

almost 2 years ago
seedbank ready

See https://github.com/james2m/seedbank/pull/28

ready

see https://github.com/james2m/seedbank#rails-5x

almost 2 years ago
diaspora_federation-rails ready

It works

ready

Since 0.1.6

almost 2 years ago
cancancan ready

Was started as a semi-official reboot of cancan (which is not yet Rails 4 ready). Work on cancan seems to have stopped, cancancan is Rails 4 ready.

ready

since gem version 1.15.0

almost 2 years ago
comfortable_mexican_sofa ready

-

ready

since version 1.12.10

almost 2 years ago
administrate ready

ok

ready

from https://github.com/thoughtbot/administrate/pull/636

almost 2 years ago
select2-rails ready

See Jose's comment

ready

since Harry's comment below

almost 2 years ago
breadcrumble ready

Breadcrumble 4.0.0 is ready for Rails 4!

ready

since commit https://github.com/ma2gedev/breadcrumble/commit/6a274b9b881d74aa69a8c3cf248fa73bacfd1d46

almost 2 years ago
omniauth ready

-

ready

since version v1.3.1 (https://git.io/vXCd0)

about 2 years ago
geocoder ready

says so in readme

ready

see https://git.io/vXCdc

about 2 years ago
novus-nvd3-rails unknown unknown about 2 years ago
dotenv-rails ready

Works fine, tested with Rails 4.

ready

since version 2.1.0 (https://github.com/bkeepers/dotenv/blob/master/Changelog.md#210---jan-13-2016)

about 2 years ago
simple_form ready

working from gem version 3.0.0

ready

since version 3.2.1

over 2 years ago