Is a gem ready for Rails 4 or 5?

Rails 4: 581 ready, 38 not ready, and 435 unknown
Rails 5: 88 ready, 9 not ready, and 957 unknown

Gems unknown for Rails 4

Name Status Rails 4 Notes Rails 4 Status Rails 5 Notes Rails 5 Status or notes updated
a2ws unknown unknown almost 5 years ago
abyss-navigation-rails unknown unknown almost 5 years ago
actionwebservice unknown unknown almost 5 years ago
active_metadata unknown unknown almost 5 years ago
active_model_serializers-ct unknown unknown almost 5 years ago
active_monitor unknown unknown almost 5 years ago
activerecord-activesalesforce-adapter19 unknown unknown almost 5 years ago
active_record-duplicate unknown unknown almost 5 years ago
activerecord-illiad-adapter unknown unknown almost 5 years ago
activerecord-voyager-adapter unknown unknown almost 5 years ago
activesalesforce unknown unknown almost 5 years ago
acts_as_api unknown unknown almost 5 years ago
acts_as_audited unknown unknown almost 5 years ago
acts_as_datetime unknown unknown almost 5 years ago
acts_as_duplicator unknown unknown almost 5 years ago
acts_as_duration unknown unknown almost 5 years ago
acts_as_ferret unknown unknown almost 5 years ago
acts_as_leaflet unknown unknown almost 5 years ago
acts-as-messageable unknown

Currently testing

unknown almost 4 years ago
acts_as_revisionable unknown

https://github.com/bdurand/acts_as_revisionable/blob/master/README.rdoc

unknown over 3 years ago