Reletter

Reletter is a research and outreach platform built around a large index of email newsletters. It helps marketers, public relations teams, authors, agencies, and founders find publications that cover a particular subject, understand their reach, and identify the people behind them. Instead of piecing together a target list from web searches and scattered media databases, a user can search one catalog spanning more than seven million newsletters. Reletter says that catalog includes publications from Substack, LinkedIn, Ghost, Beehiiv, and Kit. The central job is practical and narrow, finding the newsletters that fit a campaign well enough to merit a pitch, sponsorship inquiry, or partnership conversation.

The search engine is the starting point. A user enters a topic or niche, then works through matching publications with data such as subscriber numbers, engagement, language, country, traffic estimates, and chart rankings where those fields are available. Searches can focus on publication topics, titles, or authors, while the developer interface adds filters for audience size, platform, activity, and other indexed metadata. Reletter also surfaces contact details and social accounts for newsletter writers, which turns discovery into a usable outreach list. Lists can be assembled inside the product, shared with a team, and exported for use in a customer relationship management system. That flow is useful when a campaign needs more discipline than a spreadsheet but doesn't justify a broad media intelligence suite. Reletter keeps the research focused on newsletters rather than mixing them with podcasts, newspapers, and unrelated creator channels.

Monitoring covers the other side of the workflow. Teams can create alerts for a keyword, brand, person, or topic and receive an email when it appears in a newly indexed newsletter issue. That can support brand tracking, client reporting, competitive research, or finding writers who are already discussing a relevant market. Because Reletter indexes full issue text, a search can look past publication descriptions and into what writers have actually covered. The public Newsletter Graph offers another way to explore the index. It connects newsletters when they link to the same pages, making clusters of overlapping attention visible. The graph is an exploratory view rather than the whole product, while the paid workspace handles the recurring work of search, qualification, list building, contact discovery, and mention monitoring.

Reletter also exposes its data to developers. Its API can search publications and full newsletter issues, fetch publication metadata and contacts, retrieve chart rankings, and support recent keyword monitoring. A typed Python client and command line interface cover scripts and notebooks, while a remote MCP server lets compatible AI clients query Reletter with an API key. The developer offering is useful for teams that want newsletter data inside an internal research tool, an enrichment process, or a retrieval pipeline instead of relying only on the web interface. Reletter publishes Markdown references for language models as well, so an agent can work from structured product documentation. API access is sold as an add-on to a base plan, with quotas that start at 5,000 requests per month.

The product is best suited to teams that actively pitch newsletters, buy sponsorships, arrange cross-promotions, or track coverage for clients. Its advantage is specialization. General search can locate well-known publications, but it rarely provides a consistent combination of audience estimates, rankings, contacts, issue text, and exportable lists. Reletter puts those pieces in one workflow and covers several major newsletter platforms. That focus is also the main boundary. It isn't a general email marketing system, campaign sender, or newsletter publishing platform, and teams looking for television, print, or podcast contacts will need another database alongside it.

Access is paid, with a seven-day trial that requires a card. The Light plan starts at $49 per month and includes one user, 100 searches per month, three lists, alerts, and exports. Standard and Business plans raise user, search, list, and alert limits, with Business adding priority support. Annual billing includes two months free, according to the pricing page. The separate API add-on starts at $59 per month for 5,000 requests and still requires a base Reletter plan. Higher API quotas are published for teams that need more frequent access. That makes Reletter easiest to justify for repeat outreach or monitoring work, not an occasional one-off search, but its published tiers make the cost and capacity straightforward to evaluate before a team commits.