How does NewsletterFIT know who sponsors a newsletter?

It reads each indexed post and looks for explicit sponsorship markers such as "Sponsored by" or "Brought to you by", then checks that the brand name appears in the post. Only detections above a confidence threshold are listed, and each placement links to the source post.

Newsletter sponsors

NewsletterFIT detected 1,407 brands sponsoring 1,047 newsletters across 2,724 posts in the last 12 months. The most widely placed in the last 90 days are Front (18 newsletters), Amazon (10 newsletters) and OpenAI (9 newsletters).

Updated Oct 29, 2026 · how sponsors are detected

Brands detected: 1,407
Sponsored newsletters: 1,047
Placements: 2,724; last 12 months

Most active in the last 90 days

Ranked by how many different newsletters carried the brand.

1 Front 18 newsletters · 27 posts
2 Amazon 10 newsletters · 10 posts
3 OpenAI 9 newsletters · 15 posts
4 Granola 6 newsletters · 9 posts
5 State 6 newsletters · 8 posts
6 HubSpot 6 newsletters · 8 posts
7 Google 6 newsletters · 7 posts
8 Hinge 5 newsletters · 5 posts
9 Tracksuit 4 newsletters · 25 posts
10 Incogni 4 newsletters · 7 posts
11 Adobe 4 newsletters · 6 posts
12 Attio 4 newsletters · 6 posts
13 Smarter CRM 4 newsletters · 6 posts
14 Finally 4 newsletters · 5 posts
15 Gap 4 newsletters · 4 posts
16 Nibbles 4 newsletters · 4 posts
17 AWS 3 newsletters · 7 posts
18 Kalshi 3 newsletters · 6 posts
19 Polymarket 3 newsletters · 4 posts
20 Wispr Flow 3 newsletters · 4 posts
21 Substack 3 newsletters · 4 posts
22 DeleteMe 3 newsletters · 4 posts
23 Oracle 3 newsletters · 3 posts
24 WalMart 3 newsletters · 3 posts
25 Nike 3 newsletters · 3 posts
26 Mercury 3 newsletters · 3 posts
27 Book 3 newsletters · 3 posts
28 Vinted 3 newsletters · 3 posts
29 Alumni Ventures 3 newsletters · 3 posts
30 10K Steps 3 newsletters · 3 posts

Sponsors by topic

local government 72 brands

wellness 65 brands

self-care 63 brands

Sleep hygiene 63 brands

Community events 45 brands

public safety 41 brands

AI agents 37 brands

Startup funding 37 brands

venture capital 25 brands

All sponsors A–Z

Brands seen in at least two newsletters or three posts.

Xplor Pay

Detected automatically from posts with explicit sponsorship markers. Detection can miss placements or misread them. See also rising newsletters and all topics.