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 unknown for Rails 5

Name Status Rails 4 Notes Rails 4 Status Rails 5 Notes Rails 5 Status or notes updated
activerecord-illiad-adapter unknown unknown about 6 years ago
activerecord-oracle_enhanced-adapter ready

Since gem version 1.5

unknown over 5 years ago
activerecord-postgis-adapter ready

Version 0.7.1 works with Rails 4.0.x, and 1.0.0 works with Rails 4.1.x.

unknown over 5 years ago
activerecord-postgres-hstore not ready

No longer needed with Rails 4 (source)

unknown about 6 years ago
activerecord-postgresql-adapter ready

Dummy gem, does nothing.

unknown over 5 years ago
activerecord-reputation-system not ready

pull request ready

unknown about 6 years ago
activerecord-sqlserver-adapter not ready

since gem version 4.1

unknown about 5 years ago
activerecord-voyager-adapter unknown unknown about 6 years ago
activeresource ready

http://rubygems.org/gems/activeresource

unknown about 6 years ago
activesalesforce unknown unknown about 6 years ago
acts_as_api unknown unknown about 6 years ago
acts_as_audited unknown unknown about 6 years ago
acts_as_commentable_with_threading ready

Using the master branch

unknown almost 6 years ago
acts_as_datetime unknown unknown about 6 years ago
acts_as_duplicator unknown unknown about 6 years ago
acts_as_duration unknown unknown about 6 years ago
acts_as_ferret unknown unknown about 6 years ago
acts_as_leaflet unknown unknown about 6 years ago
acts-as-messageable unknown

Currently testing

unknown over 5 years ago
acts_as_nested_interval ready

https://github.com/clyfe/acts_as_nested_interval/pull/6

unknown about 6 years ago