Reletter

Paid

Reletter: The newsletter search engine for finding, analyzing, and partnering at scale.

#newsletter search engine#subscription-based database#email newsletters#Substack#LinkedIn#Ghost#subscriber numbers#contact details#chart rankings#traffic estimates#outreach tools#brands#advertising#PR#partnerships#topic-based search#rich analytics#CRM exports#team collaboration#keyword alerts#sponsorship-focused stats#SaaS#Babadan Labs, LLC#paid plans#automatic renewal#no prorated refunds

Type

Saas

Company

Babadan Labs, LLC

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About Reletter

Reletter is a first-of-its-kind newsletter search engine and database that indexes over seven million email newsletters from platforms including Substack, LinkedIn, Ghost, Beehiiv, and Kit. It provides subscriber numbers, author contact information (email and social media links), chart rankings, traffic estimates, engagement scores, and publishing metadata. Users can search by topic, title, author, or keywords; build and export target lists; collaborate with teams; set keyword alerts for brand mentions; and leverage a built-in pitch template for outreach. Reletter also offers an API with Python library and CLI for custom integrations with AI tools like Claude, ChatGPT, and Cursor. The platform is designed for performance marketers, PR teams, partnership managers, agencies, founders, and content creators seeking to discover, analyze, and partner with newsletter publishers at scale. It is a SaaS product by Babadan Labs, LLC with paid plans starting at $49/month, each with a 7-day free trial.

Key Features

Newsletter search engine and database indexing millions of newsletters (Substack, LinkedIn, Ghost, and more)

Subscriber numbers and audience estimates

Author contact info, including emails and social media links

Chart rankings for newsletters

Traffic and monthly visit estimates

Engagement scores from 180 days of comment and like growth

Advanced search by topic, title, author, and subject keywords

Dedicated newsletter info pages (founding date, issue count, frequency, pricing model, tone)

Filtering by active status, sponsored content, publishing model, engagement level, and subscriber count

Built-in pitch template for outreach

Pros & Cons

Pros

Unique newsletter data not found elsewhere, aggregating dozens of data points per newsletter
Indexes over 7 million newsletters with advanced search and filtering
Built-in pitch template and direct contact info to speed up outreach
API and AI integration for custom workflows and automation
7-day free trial on all plans with no fixed contract and optional refunds
Team collaboration and CRM export capabilities

Cons

Subscriber numbers only available where publishers disclose them publicly
Limited to newsletters on Substack, LinkedIn, Ghost, Beehiiv, and Kit (not all newsletters indexed)
No permanent free tier; only a 7-day trial is available
API access requires an additional monthly fee ($59/month for 5,000 requests)

Best For

Performance marketers: Build a vetted list of newsletters by topic and engagement for direct-response ad buys.PR and communications teams: Find relevant newsletter writers, grab emails and social links, and pitch stories at scale.Partnership managers: Identify sponsorship-ready publications, compare stats, and manage outreach lists.Agencies: Create and export client-specific media lists and collaborate across teams.Founders and growth leads: Discover niche newsletters where your audience spends time and test paid placements.Sales and biz dev: Source co-marketing and affiliate opportunities with publishers that match your ICP.Brand marketers: Track brand mentions with alerts and maintain relationships with top-performing newsletters.Publishers and creators: Benchmark against peers using subscriber, engagement, and ranking data.Analysts and investors: Research newsletter markets, growth trends, and category leaders.Content marketers: Find syndication and guest-post opportunities by topic and audience fit.