1
SearchWP Paid version Pro
Cross-site multisite search is a Pro feature.
95feature score
WordPress Search Plugins with Multisite search
Search across sites in a network. 5 of the 8 plugins we track include it.
2
Ajax Search Lite Paid version Pro
Pro can search across selected blogs in a multisite network.
84feature score
3
Relevanssi Paid version Premium
Free works per site on multisite; cross-site searching needs Premium.
82feature score
4
ElasticPress Included
Can return results from several sites in a network; ElasticPress.io multisite needs Extended+.
88feature score
5
WP Search with Algolia Paid version Pro
Pro builds one network-wide index with per-site exclusion.
84feature score