System Design Classroom
Investor Due Diligence Report
substackEducation
A System Design Newsletter to help you build better software.
57K
3.8K paid
+1.0%
+3.6%
net growth
Pricing
$8/mo
$69/yr annual option
$22K
3.8K paid subs
$22K/mo – $22K/mo(±0%)
1.8
56.6
0.10%
(comments + likes) / subscribers
Bi-weekly
0.5 posts/week
59/100
Variable (~15.6d avg)
| Newsletter | Subscribers | Weekly Growth | Price | Platform |
|---|---|---|---|---|
| Uncharted Territories | 124K | +0.4% | $10/mo | substack |
| 3Blue1Brown mailing list | 69K | +2.3% | Free | substack |
| Austin Scholar | 32K | +1.6% | $10/mo | substack |
| Fab Fridays | 19K | N/A | Free | substack |
| Month | Subscribers | Est. Revenue | Change |
|---|---|---|---|
| Feb 2026 | 50.5K | $27,744.43 | — |
| Mar 2026 | 53K | $29,114.89 | +4.9% |
| Apr 2026 | 55K | $30,213.56 | +3.8% |
| May 2026 | 56K | $30,762.9 | ~0% |
Platform Dependency
Uses substack platform
Publishing Consistency
Variable publishing frequency
Key Person
Single-author publication — key-person dependency
Audience Concentration
Consistent engagement across posts
Subscriber threshold
57K subscribers — above the 1K category median for first paid tier
Has paid tier
Active paid subscription offering
Peer monetization
100% of 14 similar-size peers in Education have paid tiers
Pricing position
$8/mo vs $5/mo category median (494 newsletters)
| Date | Monthly | Annual |
|---|---|---|
| Mar 2026 | $8 | $69 |
Disclaimer: This report is generated automatically based on publicly available data and proprietary estimation models. Estimated subscriber counts are derived from engagement patterns and should be verified through direct disclosure. Revenue estimates are based on known pricing and estimated paid subscriber counts. This report is for informational purposes only and should not be the sole basis for investment decisions.
| Component | Score | Weight |
|---|---|---|
| Engagement Rate | 40/100 | 30% |
| Paid Subscriber Ratio | 90/100 | 25% |
| Growth Consistency | 99/100 | 15% |
| Publishing Consistency | 69/100 | 10% |
| Rocky’s Newsletter |
| 17K |
| N/A |
| Free |
| substack |
Revenue Model
Active paid subscription tier