I have no experience with this app, but use the search engine DuckDuckGo, it is for sure the best search machine for technical searches. One possible issue: it is hosted on Amazon’s cloud server (see here: Cloud Firewall: Block G%§$e, Amazon, Facebbok, Microsoft, Apple & Cloudflare )
https://f-droid.org/wiki/page/Antifeature:NonFreeNet
Also this browser app seems to be hosted on a non-free server.
https://f-droid.org/en/packages/com.duckduckgo.mobile.android/