Ideas with a reason
Three ideas each morning, and each one says why it's there: “Your post did 3.4× your usual. This builds on it.” New to a platform? Starter ideas for your lane until you've posted three times.
- Substack
- YouTube
- X
Growth only happens when you know
what's working.
Track followers & subscribers, see which posts are breaking out, which competitors are gaining ground, and what to publish next — across all your platforms in one place.
- Sign up with Google or any email
- No passwords
- Cancel any time
Screens show example data and invented writers.
4.3×above your usual performance
Write the follow-up post→
+42new subscribers this week
Pin your best post to profile→
2.4×stronger on Wednesdays
Save your best idea for Wed→
6.1×competitor outperformance
Write your take this week→
+7.5%fastest growing in field
Ask readers to share→
20×restacks on your Note
Turn best line into a post→
3dashboards, one clear story
20competitor 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.
Every platform, one screen
Switch between Substack, LinkedIn, Instagram and YouTube, each with its next moves.
Move your cursor over the screens and hover theTap the dots for more.
- Substack, LinkedIn, Instagram and YouTube in one place
- A Note took off, and the move that turns it into a post
- Subscribers, followers and monthly revenue at a glance
- 6 posts and 11 Notes in 30 days, charted below
See who you’re racing, fairly
Scored on growth, engagement and consistency, not size, so smaller accounts can win.
Move your cursor over the screens and hover theTap the dots for more.
- Where you stand in your field, in one line
- You vs a typical rival on growth, engagement and output
- Your Signal score and rank among the writers you race
- A rival’s post is flying. Spot why, then take your swing
Your week, in one read
Today’s move, where to focus and your rank in your field, before you’ve finished your coffee.
Move your cursor over the screens and hover theTap the dots for more.
- Today’s move, from your own numbers, with the reason why
- One read across every platform, and your first move
- Your Signal score and rank in your field
Screens show example data.
Suggested for you
Three post ideas a day. A first draft in one tap.
Every morning, ideas built from what already works for you: your breakout posts, your best posts on your other platforms, and what's landing for the creators you track. For Substack Notes, LinkedIn, Instagram and YouTube.
- Each idea comes with its reason, from your own numbers
- One tap for a first draft built from your past posts
- Post it, then see how it did against your usual
- Ideas from creators you track: their shape, never their words
Draft, polish, post
Tap Draft this and AI writes a first draft from your own past posts. Make it shorter, punchier or end it with a question in one tap. Then copy it and open the app. Nothing posts without you.
Built on your own proof
Ideas start from what already worked for you, not generic trends. Drafts never make up facts or numbers: anything only you know stays [in brackets] for you to fill. Post one and see how it did: “Your suggested post did 2.1× your usual.”
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
Subscribers and followers
Your Substack audience every day, with the change over 7 days to a year.
Public · automatic
Posts, Notes and podcasts
Likes, replies and restacks on everything you publish.
Public · automatic
LinkedIn, Instagram & YouTube
Followers, subscribers, posts, reactions and video or reel views across all three, every few days.
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.
Live signals
Your signals, as they arrive
Growth tips, content wins, competitive moves and timing insights — all in one feed, updated throughout the day.
Signals arriving now
Your post “The boring system behind 1,000 subscribers” did 4.3× your usual — write the follow-up
You added 42 subscribers this week — pin your best post to your profile
Wednesdays are your strongest day, 2.4× your usual — save your best idea for Wednesday
A writer you track just did 6.1× their usual — write your take this week
Your Reel hit 12.4k views — 2.1× your usual
One of your Notes was restacked 20 times — turn its best line into a post
Your LinkedIn competitor gained 800 followers this week
Competitors
Watch your lane. Find your gap.
Add up to 5 creators you admire or compete with on each of Substack, LinkedIn, Instagram and YouTube (Facebook and X soon). StackSignal ranks you all on a Signal Score: growth, engagement per 100 readers, consistency and how often posts break out.
- Spot a rival’s breakout post, then take your own swing
- Track up to five creators on each platform
- Re-rank by Signal, audience, growth or engagement
- Everyone in your lane, ranked by Signal Score
- Their breakout posts, and why they worked
- Growth race and content mix side by side
- Words to try: topics winning for them that you haven't covered yet
- 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 (Stripe sends your receipts) | You and us |
| Your public Substack, LinkedIn, Instagram and YouTube 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, Instagram or YouTube if you like), plus up to 5 creators per platform to compare with.
3Get your signals
Your dashboard fills in within minutes. Substack refreshes daily, other platforms every few days.
Pricing
Pick the plan that fits
Start small, move up when you want posting or your assistant connected.
Hobbyist
Find your rhythm
$140$50/year
Founders price
- Substack, LinkedIn and Instagram dashboards
- 5 competitors per platform
- Daily moves and best times to post
- Post ideas every day
Posting included
Pro
Everything, including posting
$240$120/year
Founders price
- Everything in Hobbyist
- Drafts that learn your own style
- Posting and scheduling
- Your best-performing posts as the guide
Business
Everything, plus connections
$790$390/year
Founders price
- Everything in Pro
- Connect your assistant to your data
- Facebook and X (a planned upgrade)
- Priority support
Founders prices until 31 December 2026, then the crossed-out price applies. Cancel any time.
Paid Compound 30 subscriber? Your code makes StackSignal free, with everything included. No card needed.
FAQ
Good questions
Which platforms does it cover?
Today: Substack, LinkedIn, Instagram and YouTube. Facebook and X are coming soon.
Is StackSignal made by Substack?
No. It's an independent tool by Compound 30™ and isn't affiliated with Substack, LinkedIn, Instagram, Facebook, X or YouTube.
Do you need my Substack, LinkedIn, Instagram, Facebook, X or YouTube 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 and LinkedIn every day, Instagram and YouTube every two to three days. 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. On the website: Settings → Account → Manage billing. If you subscribed in the iPhone, iPad or Android app: your Apple or Google subscription settings. You keep access until the end of the period you've paid for.
Do LinkedIn, Instagram and YouTube work for competitors too?
Yes. Track up to 5 Substack writers, 5 LinkedIn profiles, 5 Instagram accounts and 5 YouTube channels, 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