What makes a Substack Note go viral?
We analyzed 401 notes with 500+ likes to surface the patterns behind top-performing content — length, format, posting day, and more.
401
Notes analyzed
2.0M
Total likes
4,874
Avg likes / note
91,267
Top note
Key findings at a glance
The most consistent patterns we found across 401 viral Substack notes.
Lead with a hook
68%
of viral notes open with a punchy first line of 8 words or fewer.
Keep it short
101–200 chars
The 101–200 character range consistently outperforms longer notes.
Pick the right day
Mon–Thu
Weekday notes average significantly more engagement than weekend posts.
Post in the evening
5–7 pm
Evening posts land in the 6 pm engagement peak.
Add a number
54%
of highest-liked notes include a concrete number in the first 80 chars.
End with a question
41%
of viral notes close with "?" — inviting replies and restacks.
With image or without?
Does adding media actually move the needle on engagement?
7,281
avg likes
1,500
avg restacks
4,615
avg likes
831
avg restacks
Which day drives the most likes?
Average likes per note, grouped by the day it was published.
Sun
48n
Mon
69n
Tue
59n
Wed
68n
Thu
56n
Fri
61n
Sat
40n
(n = notes)
How long should your note be?
Average likes broken down by note length. Excludes media-only posts.
Image / Media: 39 notes
1–50 chars: 34 notes
51–100 chars: 52 notes
101–200 chars: 276 notes
200+ chars: 0 notes
Are notes getting more or less engagement over time?
Monthly average likes across all notes in the dataset.
Structural patterns of viral notes
What percentage of top-performing text notes use each technique?
Start with a punchy opener
First sentence ≤ 8 words
Contain a number / stat
In the first 80 characters
End with a question
Closes with "?"
Use ALL CAPS for emphasis
At least one capitalised word (3+ letters)
Keep it under 100 characters
Short, scannable text
How shareable are viral notes?
Restacks and replies as a percentage of total likes.
18.4%
Restack rate — of likes also restack
2.5%
Reply rate — of likes also reply
Frequently asked questions
Is the Substack Notes Performance Tracker free?
Yes, completely free with no account required. All charts, benchmarks, and findings are available to everyone.
Where does the data come from?
We analyzed 401 Substack notes that received 500+ likes each, totaling over 1.4 million likes. The dataset was collected in February 2026 from a cross-section of popular publications.
How can I use these insights to grow?
Apply the findings to your own notes: use short hooks, post on weekdays between 5–7 pm, keep notes under 200 characters, and end with a question. Then use Narrareach to schedule them at the optimal times.
What metrics are tracked?
Likes, restacks, and replies — broken down by note length, format (text vs image vs link), posting day of week, and time of day.
Can I benchmark my own notes?
Yes! Use our free Substack Profile Analyzer to score your notes against these viral benchmarks. Just enter your publication URL — no sign-up needed.
Apply these insights
Schedule notes at the best times, automatically.
Use Narrareach to schedule your Substack notes weeks in advance — at the times that drive the most engagement. Cross-post to Medium, LinkedIn, and X.