Snyk, Greenkeeper, Mend Renovate, pyup.io, Dependabot, Libraries.io, NewReleases, Depfu, Gemnasium, Releasly, Sibbell, Banditore, Codario.io, VersionEye, ReleaseInfo, Tachikoma.io, Touchpine, ReleaseBell, deppbot, Violinist.io, Vulmon Alerts are some alternatives to Requires.io.