Kossin LabsSponsor Sheet
Find newsletters to advertise in and see prices before you email.
For: founders buying ads. Ad prices, audience sizes and booking links for tech, AI and B2B newsletters.
- 173tech, AI and B2B newsletters that take sponsors
- 93publish an ad price
- 156state an audience size
- 50are self-serve (book online, no emails)
Excel + CSV. One-time payment via Gumroad. 30-day money-back guarantee: email us within 30 days for a full refund, and if any data is wrong or a file doesn't open, we'll fix it.
What's inside
- 173 newsletters across 13 categories (developer, AI, startup, marketing, finance and more).
- Lowest listed price, currency and what that price buys, plus other listed packages.
- Audience as stated by the publisher, with open rate and click rate where published.
- A computed price-per-1,000-subscribers column, labeled as computed, so you can compare value.
- The sponsor or booking page and how to book (online, form or email).
- A source URL and a last-verified date (Oct 26, 2026) on every row.
Files: newsletter_sponsorships_v2.xlsx (tabs: README, Directory, By category) and newsletter_sponsorships_v2.csv.
Who it's for
- Founders and marketers planning their first newsletter ad buys.
- Agencies and growth teams building a shortlist of newsletters to pitch.
- Newsletter operators benchmarking their own rate card against published prices.
Of the 14 newsletters that state 500K+ subscribers, only 2 publish an ad price. Across the 68 USD rows with a computed price per 1,000 subscribers, the median is about $14.
All 21 columns
Taken from the dataset's header row.
- ID
- Newsletter
- Publisher
- Category
- Topic / audience
- Frequency
- Audience (as stated by publisher)
- Audience figure (number)
- Open rate (stated)
- CTR / click rate (stated)
- Price published?
- Lowest listed price
- Currency
- Price per 1k subscribers (CPM est.) [computed]
- What the lowest price buys
- Other listed packages
- Sponsor / booking page
- How to book
- Source URL
- Last verified
- Notes
10 real rows
Straight from the free sample file. "not published" means the source page did not state that detail.
| Newsletter | Category | Frequency | Audience (as stated) | Lowest price | What it buys | How to book |
|---|---|---|---|---|---|---|
| AI Fire | AI | 5x per week | 51.2K subscribers | $199 | Main PRO ad | Self-serve (Passionfroot) |
| AI News Roundup | AI | Daily | 19.5K subscribers | $229 | Sponsored ad (top) | Self-serve (Passionfroot) |
| Creative Automation | AI | Weekly (Wednesday) | 32.6K subscribers | €75 | Sponsored tool listing | Self-serve (Passionfroot) |
| Dense Discovery | Design | Weekly | 38K+ active subscribers | $89 | Classified ad ("from", 4 per issue) | Self-serve calendar |
| Cloud Database Insider | Developer | Twice weekly | 5,000 active subscribers | $500 | Primary newsletter sponsorship (per issue) | Passionfroot (linked from page) |
| Morning Download | Finance | Daily (weekdays) | 80K subscribers | $450 | Primary ad (one per edition) | Self-serve (Passionfroot) |
| HRAddict | HR | 3x weekly | 9.3K subscribers | $75 | Classified ad | Self-serve (Passionfroot) |
| Behind the CMO | Marketing | Twice weekly (Mon, Thu) | Just over 1,000 marketing leaders | $250 | Classified (bottom of issue) | Email via page |
| Productify | Product | Weekly (Saturday) | 33K subscribers | €199 | Text-only classified ad | Self-serve (Passionfroot) |
| Failory | Startup | Weekly (Thu) | 35.6K subscribers (bio says 40k+) | $350 | Weekly link (15 words) | Self-serve (Passionfroot) |
We plan a monthly re-verification pass, with updates free for buyers. Data compiled from public sources; confirm details with the provider before acting.