Newsletter Insights vs Radar Lab beyond subscriber counts.
Newsletter Insights tracks newsletter growth and revenue. Radar Lab helps brands pick the newsletters that reach their buyers, with the real ad as proof.
No card needed. Facts about Newsletter Insights checked on newsletterinsights.io, 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.
Bigger isn't the same as right for your brand.
Newsletter Insights is great at size: subscribers, growth and revenue. For a sponsorship, the better question is whether brands like yours paid to be there, and came back.
A big general newsletter
- Readers
- 250K
- Topic
- General business news
- Brands like yours
- 1
- Came back
- No
A niche newsletter Radar Lab pick
- Readers
- 18K
- Topic
- RevOps at B2B SaaS
- Brands like yours
- 6
- Came back
- 4 of 6
Example newsletters, made up to show the idea.
Most sponsored newsletters are still wide open: 70% of the newsletters in Radar Lab with sponsor ads have three or fewer known sponsors, and 341 have at least one brand that came back. Radar Lab data, November 2, 2026.
Newsletter Insights vs Radar Lab, side by side.
Newsletter Insights is an analytics site that tracks growth, revenue and engagement across 40K+ newsletters on Substack, Ghost, beehiiv and LinkedIn. Here's how it lines up for a brand choosing where to sponsor.
| Feature | Newsletter Insightsnewsletterinsights.io | Radar LabBuilt for brands buying sponsorships |
|---|---|---|
| Built for | Creators, investors, advertisers and platforms | Brands and agencies buying sponsorships |
| Main job | Benchmark growth and revenue across newsletters | Decide which newsletters are worth sponsoring |
| Newsletters tracked | Says 40K+ (Substack, Ghost, beehiiv, LinkedIn) | 4,700+, the ones that carry sponsors |
| Data it shows | Subscribers, growth, estimated revenue, sponsor landscape reports | 8,900+ sponsorships and 1,800+ brands, each sponsor with the real ad and date |
| Pricing | Free, $29, $149 a month, or custom | $49 a month, or $299 a year (founding price) |
| Free option | Free plan (top 20 newsletters) | 5-day free trial, no card |
| AI assistants | Not mentioned on its site | ChatGPT, Claude and Grok Bot |
Based on newsletterinsights.io 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 Newsletter Insights does well
- Very wide coverage of newsletters, including many paid Substack publications.
- Growth and revenue estimates, useful for benchmarking or checking a newsletter before buying it.
- A free plan and public rankings.
Where Radar Lab is different
- Radar Lab focuses on newsletters that carry sponsors, and shows every sponsor with the actual ad and issue date.
- It ranks newsletters by fit for your buyers, starting from your website, instead of by size or revenue.
- It tracks your competitors' sponsorships and flags newsletters none of them have found yet.
- It gives you the right contact for each newsletter and a ready-to-send email.
Should you pick Newsletter Insights or Radar Lab?
It mostly comes down to which side of the sponsorship you're on.
If you study the newsletter market
Pick Newsletter Insights
- You want growth or revenue data across many newsletters.
- You're a creator benchmarking your newsletter, or an investor doing research.
If you buy newsletter sponsorships
Pick Radar Lab
- You're planning newsletter sponsorships for a B2B brand.
- You care more about who already sponsors a newsletter, and whether they came back, than about its total size.
Can you use both? For a sponsorship decision, you don't need both. Radar Lab shows what matters before you book: fit for your buyers, past sponsors with the real ads, and where your competitors advertise.
Questions about Newsletter Insights and Radar Lab
Something else? Email hello@partnershipintel.com, or read what Radar Lab is.
It tracks growth, estimated revenue and engagement across 40K+ newsletters, with rankings and reports for creators, investors, advertisers and platforms.
It helps you check a newsletter's size and growth. Radar Lab is built for the sponsorship decision itself: fit for your buyers, past sponsors with the real ads, and where your competitors advertise.
Radar Lab focuses on newsletters that carry sponsors, since those are the ones you can buy an ad in. It reads their issues and records every sponsor ad with its date.
Newsletter Insights has a free plan and paid plans at $29 and $149 a month. 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.