Is a gem ready for Rails 4 or 5?

Rails 4: 614 ready, 38 not ready, and 433 unknown
Rails 5: 158 ready, 12 not ready, and 915 unknown
Name Status Rails 4 Notes Rails 4 Status Rails 5 Notes Rails 5 Status or notes updated
premailer-rails ready

since version 1.3.2

ready

since version 1.9.2

over 2 years ago
acts-as-taggable-on ready

since version 2.4.1

ready

since version 4.0.0

over 2 years ago
activerecord-session_store ready

version 0.0.1 is ready

ready

since gem version 1.0.0

over 2 years ago
default_value_for ready

since gem version 3.0.0

ready

since gem version 3.0.2

over 2 years ago
rspec-rails ready

apparently full support since gem version 2.14.0 (source)

ready

since version 3.5.0

over 2 years ago
bullet ready

works

ready

since version 5.2.0

over 2 years ago
action_access ready

Built for Rails >= 4.1

ready

Added explicit support for Rails 5.

over 2 years ago
high_voltage ready

-

ready

since version 3.0

over 2 years ago
factory_girl_rails ready

-

ready

since version 4.4

over 2 years ago
factory_girl ready

https://github.com/thoughtbot/factory_girl/blob/master/Appraisals#L9

ready

since version 4.4

over 2 years ago
suspenders ready

-

ready

from version 1.41

over 2 years ago
paperclip ready

since gem version 3.5.1

ready

since version 5

over 2 years ago
clearance ready

from version 1.0.0.rc7 (source)

ready

from version 1.13

over 2 years ago
godmin ready

ok

not ready

https://github.com/varvet/godmin/issues/193

over 2 years ago
user_notif ready

It works

ready

It works

over 2 years ago
devise ready

from gem version 3.0.0

ready

since gem version 4.0.0.

over 2 years ago
refile ready

Works perfectly

not ready

Not compatible with Rack 2

almost 3 years ago
query_optimizer ready

Minimize query for fetching table row

ready

Minimize query for fetching table row

about 3 years ago
dynamic_form not ready

See Leslie's comment below

not ready

See Leslie's comment below

about 3 years ago
mail_safe ready

Tested with Travis using Ruby 1.9, 2.0 and 2.1 against actionmailer 3.2, 4.0 and 4.1.

unknown about 3 years ago