Searchbar.org is described as 'Increase your sales and iterations with your target audience with a search bar integrated with your site in a moment. Gain accessibility with search predictions, delivering relevant content for your readers and followers' and is an app in the Online Services category. There are more than 10 alternatives to Searchbar.org for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Android, iPhone and Mac. The best alternative is Algolia. It's not free, so if you're looking for a free alternative, you could try Site Search 360 or Google Custom Search Engine. Other great apps like Searchbar.org are wordpress i-search pro (Paid), Expertrec Search Engine (Paid), swiftype (Paid) and Cludo Site Search (Paid).
The best site search for any website. Simple type, get search suggests, autocompletions and structured data at your fingertips. Site Search 360 is an easy drop in replacement for Google Site Search. There is also a free option for smaller websites.
CloudSh will automatically index your website and provide analytics for what people are searching for and what they are finding. Setup is easy and works with static site generators, like Jekyll, Hugo, and Gatsby.