Newsletters and podcasts: free website tools
3 free newsletters and podcasts tools for creators and media teams growing a newsletter or podcast: NewsletterDeliverabilityKit, PodcastFeedAudit, PodcastSponsorRadar. Each runs a live, read-only scan with the full result free; fix packs and monitoring are optional.
3 free, read-only checks for creators and media teams growing a newsletter or podcast. Run any of them on your own site; each shows a score, every check it ran and what to fix.
NewsletterDeliverabilityKit
For Substack, Beehiiv, Kit, Ghost and HubSpot senders with a custom domain. We check the Google and Yahoo bulk-sender DNS requirements, recursive SPF lookup count, your email provider's includes, DKIM on 30+ provider selectors, DMARC policy, BIMI, MX, reverse DNS and public blocklists, then write a copy-paste DNS fix pack for your provider.
Free scan · fix pack $4.99, monitor from $9/mo · try the demo
PodcastFeedAudit
A free, read-only validation of your podcast RSS feed: artwork, category, explicit flag, owner email, episode enclosures (HTTPS, length, type), GUIDs, dates, transcripts and Podcasting 2.0 tags.
Free scan · fix pack $4.99, monitor from $9/mo · try the demo
PodcastSponsorRadar
Paste a podcast RSS feed URL. We read up to 60 recent episodes' show notes and list the sponsors, promo codes, affiliate links and ad-attribution services (Podtrac, Chartable, Podsights, Magellan and others), with episode counts and last-seen dates.
Free scan · fix pack $4.99, monitor from $9/mo · try the demo
Other tool groups
AI search and AI-agent readiness Technical SEO Email deliverability and domains Security, privacy and trust Conversion, signup and pricing Competitive and sales intelligence Performance and design Agencies and local business sites
Frequently asked questions
Are these newsletters and podcasts tools free?
Yes. Every scan and its full result are free. An optional fix pack (copy-paste fixes for the failing checks) and monitor plans that re-check on a schedule are paid.
Do the tools change anything on my site?
No. They are read-only: they request public pages, files and DNS records the way a browser or mail server would, and never submit forms or log in.
Which newsletters and podcasts tool should I start with?
Start with NewsletterDeliverabilityKit; each result page links to related checks.