Who Sponsors Stuff vs Radar Lab for buyers, not ad sales teams.
Who Sponsors Stuff helps newsletters sell ads. Radar Lab helps brands pick the newsletters that reach their buyers, with the real ad as proof.
No card needed. Facts about Who Sponsors Stuff checked on whosponsorsstuff.com, November 2, 2026.
Sells the ad
The newsletter
Has the readers, sends the issues, sells the sponsor slots.
Buys the ad
Your brand
Needs buyers, and decides which newsletters get the budget.
Radar Lab has recorded 8,900+ sponsorships across 4,700+ newsletters, each with the real ad and date.
Built to sell ads, not to choose them.
Who Sponsors Stuff is made for a newsletter's sales team, so it follows the brands that buy ads. Radar Lab follows the newsletters, so a buyer can see the whole market.
Newsletters by market in Radar Lab
- Marketing374
- AI327
- Finance248
- Developer Tools226
- Productivity201
- Creator Economy177
- Cybersecurity169
- Startups167
- HR147
- Design145
Newsletters in Radar Lab are grouped into 30 markets, so you start from the readers you want, not from a list of brands. Radar Lab data, November 2, 2026.
Who Sponsors Stuff vs Radar Lab, side by side.
Who Sponsors Stuff is a database of brands that buy newsletter ads, with a paid plan called Sales Pro for newsletter ad sales teams. Here's how it lines up for a brand choosing where to sponsor.
| Feature | Who Sponsors Stuffwhosponsorsstuff.com | Radar LabBuilt for brands buying sponsorships |
|---|---|---|
| Built for | Newsletter publishers and ad sales teams | Brands and agencies buying sponsorships |
| Main job | Find brands to pitch, with contacts and alerts | Decide which newsletters are worth sponsoring |
| Newsletters tracked | Says 500+ | 4,700+ |
| Data it shows | Says 10,000+ sponsor contacts, plus ad creative archives | 8,900+ sponsorships and 1,800+ brands, each sponsor with the real ad and date |
| Pricing | Free browsing; Sales Pro on request | $49 a month, or $299 a year (founding price) |
| Free trial | Free tier with limited records | 5 days, no card |
| AI assistants | Not mentioned on its site | ChatGPT, Claude and Grok Bot |
Based on whosponsorsstuff.com as of November 2, 2026. Tools change; if something here is out of date, tell us at hello@partnershipintel.com and we'll fix it.
Fair to both. Here's the honest version.
What Who Sponsors Stuff does well
- Built around the newsletter ad sales workflow: saved searches, alerts and CSV downloads.
- Direct contacts for sponsors, with unlimited seats on Sales Pro.
- Well known in the newsletter industry, with free tools and yearly lists of top sponsors.
Where Radar Lab is different
- Radar Lab starts from your website and ranks newsletters by fit for your buyers.
- It flags newsletters no competitor has sponsored yet, and shows which ones your competitors keep paying for.
- Every sponsor comes with the actual ad and issue date, across 4,700+ newsletters.
- A public price for brands, and it works inside ChatGPT, Claude and Grok Bot.
Should you pick Who Sponsors Stuff or Radar Lab?
It mostly comes down to which side of the sponsorship you're on.
If you sell newsletter sponsorships
Pick Who Sponsors Stuff
- You sell ads for a newsletter and need brands to pitch.
- Your sales team wants sponsor contacts, alerts and exports.
If you buy newsletter sponsorships
Pick Radar Lab
- You're the brand or agency buying the ads.
- You want to know which newsletters fit your buyers and what other sponsors ran there before you book.
Can you use both? They answer opposite questions. A newsletter's sales team uses Who Sponsors Stuff to find you; you use Radar Lab to decide whether that newsletter is worth it.
Questions about Who Sponsors Stuff and Radar Lab
Something else? Email hello@partnershipintel.com, or read what Radar Lab is.
Newsletter publishers and ad sales teams. Its Sales Pro plan is described as helping you find and reach sponsors for your newsletter.
You can browse which brands sponsor which newsletters, but it's built for selling ads, not for ranking newsletters by fit for your buyers. Radar Lab is built for that buying decision.
Who Sponsors Stuff says it tracks 500+ newsletters. Radar Lab tracks 4,700+ newsletters and updates its totals every day.
Who Sponsors Stuff has free browsing, and Sales Pro pricing is on request. Radar Lab Pro is $49 a month, or $299 a year at the founding price, with a 5-day free trial.
Find the newsletters that reach your buyers, before your competitors do.
Add your website. Radar Lab ranks newsletters by fit, flags the ones no competitor has sponsored yet, and shows the real ads others ran there.
Try Radar Lab free for 5 days No card needed. Then $49 a month, or $299 a year at the founding price.