Know what to post next

Stop wasting content on guesses. Grow on what actually works.

Cullen analyzes the content going viral in your algorithm — and shows you why it hit and what to make next. Real proof, no hallucinations, right inside your browser.

Works on Instagram, TikTok & YouTube Shorts.

Add to Chrome

Free for 7 days, 12 credits, no card.

The likes trap

Likes are the wrong measurement.

A post can top the likes chart just because the account was bigger by the time it went up, or because it's recent, not because the idea was any good. Sort by likes and you rank an account's biggest-reach posts, not its best and most impactful ones.

The real test: did a post beat its baseline engagement at that time? When it does, the idea won on merit, not on follower count. That's a breakout post, and it can sit 200th by likes.

A level-up post permanently raised the account's baseline engagement: it found an audience and kept it. That's the post worth studying.

@ava.summers3.4× baseline engagement
new baseline
baseline
▲ level-up ▲ breakout
A breakout beats the baseline for a moment.
A level-up moves the baseline.
Claims sized to the evidence

ChatGPT will always give you a reason, even when it’s fabricated.

Ask it why a post went viral and you get an instant, confident answer, built from what usually works, not from what this post actually did. Guess or fact, it sounds identical. It will never tell you which.

Cullen runs the same frontier technology, pointed at evidence. It watches the video, reads the comments, and sizes every claim to what it finds. What it can prove, it cites. What it can’t, it flags unverified instead of inventing.

Why did this reel do 38×?
@ava.summers · Reel · Nov 25
ChatGPT

“Great question! This reel likely went viral due to a combination of factors: a strong hook, trending audio, and authentic relatability. Keep up the great work! ✨”

confident · checked nothing

Cullen

The failed transition at 0:04: she misses twice before it lands▸ top comment · 3.1K likes

“the third try took me OUT 😭”

“Trending audio”falsified: 0 of the top 40 comments mention it

How it works

Cullen kills the busywork. Then it kills the guesswork.

The Busywork · Sort & Capture only $1/mo

Stop doing it by hand.

The enemy: the spreadsheet.

01

Scan any profile

Open any public Instagram, TikTok or YouTube Shorts profile and run the scan: 60, 120, up to 500 posts deep. Cullen sorts the whole history by how each post actually performed, not by recency or likes. No scrolling, no copying numbers into a sheet.

02

Find the real breakouts

Cullen captures the posts that genuinely broke out: the ideas that actually had impact, not the ones that just caught likes. The real outliers rise to the top. The lucky and the recent sink.

The Guesswork · Analyze & Replicate

Stop trusting the hallucination.

The enemy: the invented lie.

03

Get the why, with receipts

One click on any breakout: Cullen watches the video, reads the top comments, and returns a verdict. Every trigger is tagged confirmed, falsified, or unverified, with the exact comment quoted as proof. Not a vibe. A case file.

04

Steal it correctly

Cullen turns the verdict into your play: what to take, what to drop (the part that worked for their audience and would flop for yours), the safe move and the bolder swing. Then it writes two ready-to-film scripts on demand.

Who it’s for

Made for the one person doing all of it.

You run social for a brand, or you are the brand.

You’re the one sorting the feed by hand, eyeballing what worked, keeping it in a spreadsheet. Cullen scans it in seconds and shows you the real breakouts, so you spend the time making, not sorting.

You’re a creator reverse-engineering your competition.

Real money’s on the line and you’re done wasting content on guesses. Cullen tells you why a post actually broke out: grounded in evidence, not a confident guess you can’t trust.

Cullen is what you open first.

Pricing

Find the breakout for free. Pay when it earns it.

7 days free, no card, including 12 analysis credits: enough to deep-dive four real breakouts in your niche and read the receipts yourself. $1 a month to capture what breaks out. $19 a month to replicate it for your account.

Level 1 · the busywork

Sort & Capture

Kill the spreadsheet.
Free for 7 days, no card
then $1/month, billed yearly ($12)
  • An account’s entire history ranked by real performance: up to 500 posts in one scan, zero scrolling
  • Every post scored against the account’s own baseline. Breakouts and level-ups surface; the lucky and the recent sink
  • Instagram, TikTok & YouTube Shorts. All three, today
  • Works right where you already scroll: Chrome, Arc, Brave, any Chromium browser
Add to Chrome
Level 2 · the guesswork

Analyze & Replicate

Kill the hallucination.
$19 /month
top up anytime: $5 per 100 credits
  • Everything in Level 1
  • 300 fresh credits every month: up to 100 deep-dives (3 credits each). Plan credits reset each cycle; top-ups never expire
  • Every verdict with receipts: triggers confirmed, falsified, or flagged unverified, with the comment quoted as proof
  • Two ready-to-film scripts from any breakout, 1 credit
  • A play built for your brand and voice: what to steal, what to drop, the safe move and the bolder swing
  • Taste it first: the free trial includes 12 credits, no card
Add to Chrome
Level 3 · the homework

Prescribe & Prove

Kill the flop.
Coming soon
in development · alpha test
  • Every post you publish gets the same forensic pass you run on everyone else. The why behind your numbers, not just theirs
  • When one dies, you get a reason, not a shrug. Read against your own baseline and what works in your lane
  • A weekly prescription: what to make next, built from what your last posts just proved and disproved
  • Cullen keeps score on itself. Every call about your account, checked against what actually happened
  • The longer it runs, the more it knows your audience specifically. A case history no generic tool has
Coming soon
Before your next post

Your next post shouldn’t be a guess.

Somewhere in your niche there’s a post that did 100× the creator’s usual numbers, and a reason it worked that nobody has verified. 7 days free with 12 analysis credits, no card. Point Cullen at the biggest breakout you know and read the receipts yourself. If it doesn’t change what you post next, don’t pay us.

Add to Chrome Free for 7 days, 12 credits, no card.
Questions

Straight answers.

What is Cullen?

A Chrome extension for Instagram, TikTok, and YouTube Shorts. It scans any public profile, finds the posts that genuinely broke out against that account’s own baseline, and explains why they worked with evidence from the video and the real comments.

What counts as a “breakout”?

A post that beat its account’s own baseline engagement at the time it was posted. Not the most likes: a breakout can sit 200th by likes and still be the most important post on the channel. A level-up is a breakout that permanently raised the baseline afterward.

How is this different from asking ChatGPT?

A chatbot answers from what usually works, and it sounds confident either way. Cullen watches the actual video and reads the actual comments, then tags every claimed trigger confirmed, falsified, or unverified, quoting the comment as proof. If the evidence is not there, it says so.

What does it cost?

7 days free with 12 analysis credits, no card. Level 1 (sorting and breakout detection) is $12 a year. Level 2 (the full analysis and scripts) is $19 a month or $149 a year, with 300 credits a month. A deep-dive costs 3 credits; scripts cost 1.

Do I hand over my social logins?

No. Cullen never asks for your Instagram, TikTok, or YouTube password. It reads public profiles in your own browser, in your own session, on the same pages you can already see. You sign in to Cullen itself with Google or an email code.

Which platforms and browsers does it work on?

Instagram, TikTok, and YouTube Shorts today. The extension runs in Chrome and any Chromium browser, including Arc, Brave, and Edge.