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

Gems ready for Rails 5

Name Status Rails 4 Notes Rails 4 Status Rails 5 Notes Rails 5 Status or notes updated
database_cleaner ready

since gem version 1.0.0 (source)

ready

since version 1.5.2

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
delayed_paperclip ready

Version 3.0 is ready for Rails 4, implemented, tested.

ready

Version 3.0 is ready for Rails 5, see comment in release notes.

over 1 year ago
devise ready

from gem version 3.0.0

ready

since gem version 4.0.0.

over 2 years ago
diaspora_federation-rails ready

It works

ready

Since 0.1.6

about 2 years ago
doorkeeper ready

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

ready

since version 4.0.0

over 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)

over 2 years ago
drafting ready

see readme

ready

see readme

over 2 years ago
draper ready

-

ready

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

almost 2 years 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

almost 2 years ago
exception_notification ready

since 4.0.0.rc1

ready

from version 4.2.0

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
factory_girl_rails ready

-

ready

since version 4.4

over 2 years ago
faraday ready

In use.

ready

does not depend on Rails

about 1 month ago
filterrific ready

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

ready

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

almost 2 years ago
fog-aws ready

Running on our 4.2 app for some time

ready

Not dependent on Rails

about 1 month ago
font_assets ready

running on our 4.2 app for some time

ready

Not dependent on rails

about 1 month ago
font-awesome-rails ready

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

ready

since version 4.5.0.1

over 2 years ago
foreman ready

-

ready

when not bundled in Gemfile. See https://github.com/ddollar/foreman/issues/688#issuecomment-326615890

about 1 month ago
geocoder ready

says so in readme

ready

see https://git.io/vXCdc

over 2 years ago