Is a gem ready for Rails 4 or 5?

Rails 4: 573 ready, 37 not ready, and 436 unknown
Rails 5: 75 ready, 8 not ready, and 963 unknown

Gems ready for Rails 5

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

Built for Rails >= 4.1

ready

Added explicit support for Rails 5.

about 1 year ago
activeadmin ready

since gem version 1.0.0

ready

since gem version 1.0.0

2 months ago
activerecord-import ready

Use activerecord-import 0.4.0 or higher.

source

ready

since version 0.15.0 (https://github.com/zdennis/activerecord-import/blob/master/CHANGELOG.md#changes-in-0150)

about 1 month ago
activerecord-session_store ready

version 0.0.1 is ready

ready

since gem version 1.0.0

12 months ago
active_record_union ready

why not?

ready

According to changelog ready from 1.2.0 https://github.com/brianhempel/active_record_union#changelog

11 months ago
acts_as_paranoid ready

See comment of jonty davis below

ready

0.5.0

12 months ago
acts-as-taggable-on ready

since version 2.4.1

ready

since version 4.0.0

12 months ago
administrate ready

ok

ready

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

7 months ago
attr_encrypted ready

See Jason's comment below

ready

since version 3.0.2

12 months ago
brakeman ready

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

ready

since gem version 3.1.5

12 months ago
breadcrumble ready

Breadcrumble 4.0.0 is ready for Rails 4!

ready

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

7 months ago
bullet ready

works

ready

since version 5.2.0

12 months ago
bundler ready

Does not depend on rails

ready

Does not depend on rails

2 months 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

7 months ago
choices ready

Does not depend on Rails

ready

does not depended on Rails

about 2 months ago
clearance ready

from version 1.0.0.rc7 (source)

ready

from version 1.13

about 1 year ago
cloudinary ready

https://github.com/cloudinary/cloudinary_gem/blob/master/cloudinary.gemspec

ready

https://github.com/cloudinary/cloudinary_gem/pull/243

3 months ago
coffee-rails ready

_

ready

since gem version 4.1.1

12 months ago
comfortable_mexican_sofa ready

-

ready

since version 1.12.10

7 months ago
database_cleaner ready

since gem version 1.0.0 (source)

ready

since version 1.5.2

12 months ago