Public · automatic
Subscribers and followers
Your Substack audience every day, with the change over 7 days to a year.
Substack, LinkedIn + Instagram
Know what's working.
Post what's next.
Your followers, subscribers and posts across Substack, LinkedIn and Instagram, ranked against the creators in your lane, with up to four clear next moves every day.
- Sign up with Google or any email
- No passwords
- Cancel any time
Screens show example data and invented writers.
Your post “The boring system behind 1,000 subscribers” did 4.3× your usual — write the follow-upYou added 42 subscribers this week — pin your best post to your profileMondays are your strongest day, 1.4× your usual — save your best idea for MondayA writer you track just did 6.1× their usual — write your take this weekYou’re the fastest-growing writer in your field, up 7.5% — ask readers to share your best postOne of your Notes was restacked 20 times — turn its best line into a post
3dashboards, one clear story
15competitor slots (5 per platform)
24hour refresh on Substack
0passwords to remember
The dashboard
Three tabs. One clear next move.
Open it in the morning, know exactly what to write and when to post it. Built for your phone first.
Substack, LinkedIn + Instagram
Your numbers, finally in one place
Subscribers, followers, posts, Notes and podcasts, with what changed and why.
- Today's subscriber count, with the change over your window
- Private: numbers only you add, like revenue
- Any window: 7 days to a year
- Your next move, in plain English
What it tracks
Every number that moves your growth
Public numbers arrive on their own. Private ones only exist if you add them, and only you ever see them.
Public · automatic
Posts, Notes and podcasts
Likes, replies and restacks on everything you publish.
Public · automatic
LinkedIn & Instagram
Followers, posts, reactions and reel views across both, every week.
Public · automatic
Your Substack posts
Every post you publish, with likes, restacks and comments — see what’s landing.
Worked out for you
Breakout posts
Which posts beat your typical post, and by how much (1.4×, 5.8×…).
Worked out for you
Best time to post
A day-by-time heatmap of when your audience engages, in your time zone.
Worked out for you
Signals
Up to four plain-English next moves, picked from what changed.
Private · only you
Revenue and podcast downloads
Type them in from your own stats to chart them over time.
Private · only you
Per-post views, opens and new subs
Add them to any post to see what actually converts.
Competitors
Watch your lane. Find your gap.
Add up to 5 creators you admire or compete with on each of Substack, LinkedIn and Instagram. StackSignal ranks you all on a Signal Score: growth, engagement per 100 readers, consistency and how often posts break out.
- Your rank in your field, by Signal Score
- A rival's breakout post becomes your next idea
- Their breakout posts, and why they worked
- Growth race and content mix side by side
- Gap finder: topics winning for them that you haven't covered
- Public counts and public posts only. Never subscriber lists.
Your data
What we use, and what it's for
No passwords, no selling, no ads, no tracking cookies. Here's the short version.
Private Numbers you type in are shown only to you.
| What | Where it comes from | What it's used for | Who sees it |
|---|---|---|---|
| Your email | You, when you sign up with Google or email | Signing you in and joining you to the Compound 30 Substack (Stripe sends your receipts) | You and us |
| Your public Substack, LinkedIn and Instagram stats | Your public profile and posts | Your dashboard, signals and rank | You |
| Competitors' public stats | Their public profiles and posts | Your comparisons, as counts only | You |
| Numbers you type in | You, from your own Substack stats | Your revenue, podcast and per-post charts | Only you |
| Subscriber CSV (optional) | You, from Substack's export | Superfans, new readers, paid share and who left. Read on your device; emails are scrambled before anything is saved | Only you |
| Payment | Stripe's secure checkout | Billing your plan | Stripe (we never see your card) |
| Sign-in security logs | Your browser, when you sign in | Keeping your account safe and stopping abuse (IP address, browser details) | Only us |
Full detail in our Privacy policy, Terms and Cookies pages.
How it works
Set up in about two minutes
1Create your account
Continue with Google, or use any email address. No password.
2Add your handles
Your Substack (and LinkedIn or Instagram if you like), plus up to 5 creators per platform to compare with.
- 3
Get your signals
Your dashboard fills in within minutes and refreshes every day from then on.
Pricing
Less than a coffee a month
One plan, everything included. Cancel any time.
Best value · 2 months free
Yearly
$50/year
- All three dashboards
- 5 competitor slots per platform
- Substack daily, Instagram every 2 days, LinkedIn weekly
Paid Compound 30 subscriber? Your code makes StackSignal free. No card needed.
FAQ
Good questions
Is StackSignal made by Substack?
No. It's an independent tool by Compound 30™ and isn't affiliated with Substack, LinkedIn or Instagram.
Do you need my Substack, LinkedIn or Instagram password?
Never. StackSignal reads public pages only, plus any numbers you choose to type in yourself.
Can the writers I track see that I'm tracking them?
No. We only read their public profile and public posts. Nothing is sent to them.
How do I sign in?
With your Google account, or with any email address: we send a 6-digit code. There's no password to remember or leak.
How often does it update?
Substack every day, Instagram every two days, LinkedIn every week. You can also tap Refresh to update your Substack numbers sooner.
I'm a paid Compound 30 subscriber. Is there a code?
Yes. Paid Compound 30 subscribers get a code that makes StackSignal free. Add it when you choose your plan and no card is needed.
Can I cancel?
Any time, in Settings → Account → Manage billing. You keep access until the end of the period you've paid for.
Do LinkedIn and Instagram work for competitors too?
Yes. Track up to 5 Substack writers, 5 LinkedIn profiles and 5 Instagram accounts, each ranked against you on its own leaderboard.
Can I see my superfans?
Yes. Upload the subscriber export from Substack and StackSignal ranks your most engaged readers and lists who joined. The file is read on your device: raw emails never reach us.
Your next best post is already in your data.
See it tomorrow morning.
Create your account