Is a gem ready for Rails 4 or 5?

Rails 4: 550 ready, 38 not ready, and 436 unknown
Rails 5: 39 ready, 7 not ready, and 978 unknown
Name Status Rails 4 Notes Rails 4 Status Rails 5 Notes Rails 5 Status or notes updated
pg ready

Does not depend on Rails

ready

Does not depend on Rails

7 days ago
hyperkit ready

It works!

unknown 11 days ago
drafting ready

see readme

ready

see readme

11 days ago
keepr ready

see readme

ready

see readme

11 days ago
acts_as_paranoid ready

See comment of jonty davis below

ready

0.5.0

21 days ago
squeel ready

Support for ActiveRecord 4.0.0 added in version 1.1.0 (source)

not ready

see https://github.com/activerecord-hackery/squeel/issues/412

21 days ago
newrelic_rpm ready

_

ready

since version 3.15.0

25 days ago
database_cleaner ready

since gem version 1.0.0 (source)

ready

since version 1.5.2

25 days ago
gon ready

_

ready

since version 6.0.1

25 days ago
attr_encrypted ready

See Jason's comment below

ready

since version 3.0.2

25 days ago
rack-oauth2 ready

_

ready

since version 1.2.2

25 days ago
kaminari ready

_

ready

since version 0.17.0

25 days ago
doorkeeper ready

since 0.7.0 https://github.com/applicake/doorkeeper/blob/master/CHANGELOG.md#070

ready

since version 4.0.0

25 days ago
state_machines-activerecord ready

_

ready

since version 0.4.0

25 days ago
thin ready

_

ready

since version 1.7.0

25 days ago
oauth2 ready

Standalone gem

ready

since version 1.2.0

25 days ago
web-console ready

_

ready

since version 2.3.0

25 days ago
font-awesome-rails ready

https://github.com/bokmann/font-awesome-rails/issues/45

ready

since version 4.5.0.1

25 days ago
coffee-rails ready

_

ready

since gem version 4.1.1

25 days ago
brakeman ready

Tests show that it works under rails '4.0.0.beta1'.

ready

since gem version 3.1.5

25 days ago