For agencies & media buyers
Newsletter media plans your clients can see the research behind
Clients ask why these newsletters and not others. NewsletterFIT gives you the whole market for any category in minutes: audience, activity, momentum and the brands already buying there, so the plan arrives with its evidence attached.
7 days of Pro, no credit card required
The problem
Every new client starts the research from zero
A new category means another round of searching, media kits and spreadsheets. The work is repeated per client, it is hard to show, and it misses newsletters nobody on the team has heard of.
What you can do
A category shortlist per client
Search a client's category, rank by audience and momentum, and save it as that client's watchlist.
Newsletter searchShow who already buys there
Sponsor history on every profile tells a client whether competitors are already in a newsletter, and how often they come back.
Sponsor intelligenceMonitor every client's competitors
Alerts on companies and people across all your clients, delivered as a daily or hourly digest.
AlertsPull the data into your own decks and tools
Use the API or MCP server to drop newsletter records into reports, spreadsheets or your planning tools.
API
Example
One category, as a client would see it
Real newsletters from the index for one topic. In the app you add sponsor history, momentum and the full list.
beehiiv · Several times a week · Developer tools · AI agents
Likely audience · Product managers
Sponsors ·
Activity · 58 posts in the last 90 days · last post today
substack · Several times a week · AI agents · Developer tools
Likely audience · CTOs
Sponsors · None detected recently
Activity · 31 posts in the last 90 days · last post 11 days ago
beehiiv · Several times a week · AI agents · Investment strategy
Likely audience · Investors
Sponsors · None detected recently
Activity · 50 posts in the last 90 days · last post 7 days ago
beehiiv · Weekly · Developer tools · AI Agents
Likely audience · AI developers
Sponsors ·
Activity · 12 posts in the last 90 days · last post 2 days ago
How it works
01
Pick the client's category
Search by topic, competitor or keyword.
02
Shortlist with evidence
Audience, cadence, momentum and sponsor history side by side.
03
Keep watching
Alerts tell you when a competitor shows up or a newsletter takes off.
FAQ
Can one account cover several clients?
Yes. Use separate watchlists and alerts per client. Intelligence and Enterprise plans raise the limits for teams running many categories at once.
Can I export data for client reports?
Enterprise includes JSON exports of recent publications, articles and entities. Every paid plan includes API and MCP access, which most agencies use to pull records into their own decks.
Do you broker placements or take a commission?
No. NewsletterFIT is a research tool. You keep the client relationship and deal with publishers directly.
Which platforms are included?
Substack, beehiiv and newsletters on their own domains. The methodology page lists the sources and how each figure is labelled.