Is a gem ready for Rails 4 or 5?

Rails 4: 615 ready, 38 not ready, and 433 unknown
Rails 5: 163 ready, 11 not ready, and 912 unknown

Gems ready for Rails 5

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

Does not depends on Rails

ready

does not depend on Rails

7 months ago
rubocop-rspec ready

Running on our 4.2 app for some time

ready

Not dependent on rails

7 months ago
sass-rails ready

_

ready

since gem version 5.0.5

about 3 years ago
scenic ready

-

ready

5.2 from master, 5.1 from v1.4.0, 5.0 from v1.1.0 (at least, could be earlier)

7 months ago
scientist ready

Not dependent on Rails

ready

Not dependent on Rails

7 months ago
sdoc ready

does not depend on Rails

ready

does not depend on Rails

7 months ago
seedbank ready

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

ready

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

over 2 years ago
seed-fu ready

since version 2.3.0

ready

since version 2.3.6

about 3 years ago
select2-rails ready

See Jose's comment

ready

since Harry's comment below

over 2 years ago
shoulda ready

per README for 4.2

ready

per README, at least for 5.0

7 months ago
shoulda-matchers ready

ready since gem version 2.4.0 (source)

ready

since gem version 4

4 months ago
shrine ready

https://github.com/janko-m/shrine/blob/master/CHANGELOG.md

ready

https://github.com/janko-m/shrine/blob/master/CHANGELOG.md

over 2 years ago
sidekiq ready

source

ready

does not depend on Rails

7 months ago
sidekiq-cron ready

works with Activejob (Rails 4.2+) and has been present and working in our app for years.

ready

Probably ready: there are live stories of people using it with rails 5.

7 months ago
sidekiq-pro ready

Not dependent on Rails

ready

Not dependent on Rails

7 months ago
simple_form ready

working from gem version 3.0.0

ready

since version 3.2.1

almost 3 years ago
sinatra ready

Does not depend on Rails.

ready

does not depend on Rails

7 months ago
skylight ready

running in our 4.2 app for some time

ready

5.2 from v2.0.2 5.1 from v2.0.0 5.0 from v1.0.0

7 months ago
smarter_csv ready

running on our 4.2 app for some time

ready

Not dependent on Rails

7 months ago
spring ready

It's Rails core.

ready

from gem version 2.0.0 - though there is this bug: https://github.com/rails/spring/issues/485

7 months ago