Kossin Labs

Verified spreadsheets for founders

Stop digging through 250+ websites. We already did.

Newsletter ad rates, startup accelerators and AI/SaaS affiliate programs, collected from each organization's own public pages. Every row has a source link and a verified date. Nothing is estimated.

Browse the spreadsheetsGet the free sampler
  • 405verified rows
  • 3datasets, Excel + CSV
  • 100%rows with a source URL
  • Oct 26, 2026last verified
The spreadsheets

Pick a sheet, or get all three

One-time purchase on Gumroad. Each product page shows 10 real rows so you can check the format first.

Sponsor Sheet

$49one-time

What newsletter ads actually cost: published prices, audience sizes and how to book.

  • 173 tech, AI and B2B newsletters that take sponsors
  • 93 publish an ad price
  • 156 state an audience size
  • 50 are self-serve
Buy on Gumroad See what's inside

Accelerator Atlas

$39one-time

Accelerators, incubators and fellowships with investment amounts, equity terms and a deadlines tab.

  • 117 accelerators, incubators and fellowships
  • 71 state an investment amount
  • 66 state equity terms
  • 25 take no equity
Buy on Gumroad See what's inside

Affiliate Atlas

$39one-time

AI and SaaS affiliate programs: commission, how long it recurs, cookie window and payouts.

  • 115 AI and SaaS affiliate programs
  • 106 publish a commission
  • 27 say they pay for the customer's lifetime
  • 48 publish a cookie window
Buy on Gumroad See what's inside
Free sampler

Try 30 real rows first

10 rows from each sheet as CSV, same columns as the full files. Pay what you want, including $0.

Get the free sampler
How it's built

Copied from the source, never estimated

01 / Collect

Public pages only

Values come from each organization's own page: sponsor pages and media kits, program and application pages, and affiliate terms or official network listings.

02 / Verify

Source on every row

Each row links to the exact page used and carries a last-verified date. If a source doesn't publish a number, the cell stays blank.

03 / Package

Ready to filter

Excel workbooks with a README and summary tabs, plus CSVs for your own tools. Computed columns are labeled as computed.

We plan a monthly re-verification pass, with updates free for buyers. Prices, terms and deadlines change, so always confirm details with the provider before acting.

FAQ

Questions

What do I get?

Each spreadsheet comes as an Excel workbook (.xlsx) and a CSV file. The workbooks have a README tab that explains every column, a Directory tab with all rows, and summary tabs. The CSVs work in Google Sheets, Airtable, Notion or your own scripts.

Where does the data come from?

Every value is copied from the organization's own public page: newsletter sponsor pages and media kits, accelerator program and application pages, and affiliate program pages or official network listings. Each row links to its source.

What does a blank cell mean?

It means the source did not publish that detail. We leave it blank rather than estimate. The one calculated column, price per 1,000 subscribers in the Sponsor Sheet, is labeled as computed.

How current is it?

Every row was verified as of Oct 26, 2026 and carries its own last-verified date. Prices, terms and deadlines change, so confirm details with the provider before you act. We plan a monthly re-verification pass, with updates free for buyers.

Can I see the data before buying?

Yes. Each product page shows 10 real rows, and the free sampler on Gumroad has 30 rows, 10 from each sheet, as CSV.

Are the links affiliate links?

No. Links in the sheets, including in the Affiliate Atlas, are plain links to each organization's own pages. Kossin Labs is not affiliated with any newsletter, program or company listed, and inclusion is not endorsement.

Can I get a refund?

Yes. Every purchase comes with a 30-day money-back guarantee: email [email protected] within 30 days of purchase for a full refund. And if any data is wrong or a file doesn't open, we'll fix it. Want to check the format and quality first? Grab the free sampler.

I found an error or my listing is out of date.

Please email [email protected] with the row and the correct source, and we will fix it.