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CompareOpen in Google Play
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Fixed retrying Pro purchases after a temporary Google Play connection failure.
Diagnose DNS, HTTPS and email-domain settings; export clear network reports.
DNS Doctor performs A, AAAA, CNAME, NS, MX, and TXT lookups for domains you enter. Check HTTPS reachability, redirects, and TLS certificate expiry. Inspect SPF, a DKIM selector you provide, and DMARC records with plain-language findings. Save domains, compare history, and export results. The app does not ask for credentials or use a remote scanning service; network queries go only to the services needed for the check. Saved records stay local unless you export or share them. Contains ads. DNS · SOA / CAA What Pro adds Automatic watchlist rechecks Your saved domains are rechecked automatically in the background, and every recheck is added to history. No ads Every screen stays free of banner and interstitial ads. Billed once a year through Google Play at the price shown. The subscription renews automatically every year until you cancel. Cancel any time in Google Play > Payments & subscriptions > Subscriptions; Pro stays active until the end of the paid year. Resolver comparison · Pro Send this domain query directly to Cloudflare and Google over encrypted HTTPS. Answers may differ because of caching, location or DNS changes. No query is sent until you tap Compare.