I analysed 10,743 Instagram carousels and scored each one against its own creator’s usual likes and comments, so a small account that blew up counts and a big account’s average post doesn’t. Here are the three things from the reel, the rest of the list, and the library of 4,520 viral carousels to copy from.
The one I said can double your views. A number tells people exactly what they’re getting before they even swipe.
The viral ones typically have 8. Fewer slides means less time on your carousel, and two or three slides did the worst of any length.
A save means someone wants to come back to it, and the posts people save are the ones they send. Sends are one of the three signals Instagram says matter most.
Every bar is the share of carousels that doubled their creator’s usual likes and comments. The average is 23.9%, so anything well above that is worth copying.
Carousels with a number on slide one doubled their creator's usual more often. It works in lists and how-tos, where the number is a promise (“7 tools”, “5 steps”). In stories and opinions it made no difference.
Do this: Lead with the count. Years (“2026”) and big numbers (“10,000”) did best in the sample.
6,224 first slides read by AIThe viral ones typically have 8 slides. Two or three slides did the worst of any length, and 11–15 did the best. Past 15 it drops again.
Do this: If your idea fits in 3 slides, it's a reel or a tweet. Give people more to swipe.
10,743 carouselsChecklists and reference carousels, the kind people save to come back to, beat every other format by a wide margin.
Do this: Turn your next list into something people would screenshot: a checklist, a table, a one-page reference.
10,743 carousels · cheat sheets are a small group (120)Carousels whose caption says “save this” doubled their creator's usual a third of the time instead of a quarter. People ask for saves on their most useful posts, and it shows.
Do this: If it's worth saving, say so in the caption. If it isn't, fix the carousel first.
Sample: 4,045 carousels where every slide and caption was readSix to ten words was the best length for a first slide. A crammed first slide is the clear loser: with 41 or more words on it, only 20.2% doubled, against 26.7% for the rest (sample).
Do this: One line that says what they're getting. Move everything else to slide two.
6,224 first slides read by AINews carousels and showcases (photo dumps, portfolios, “look at this” posts) doubled their creator's usual least often of all nine formats.
Do this: If you cover news, add the “what this means for you” and the steps. That turns it into a how-to.
10,743 carouselsCarousels with a video slide in them did worse than the same creators' image-only carousels. 24 of 33 creators did worse with one.
Do this: Keep carousels as images. Post the video as its own reel.
Sample: 4,045 carousels where every slide and caption was readThe biggest gap in the whole list, on a small group: first slides with the word “free” on them (“9 YouTube courses… for free”).
Do this: If what you're sharing is free, put the word on the cover.
Sample: 4,045 carousels where every slide and caption was read · only 110 say "free"Captions of 120–250 words did better than short ones. The carousel hooks them, the caption gives the context.
Do this: Use the caption for the story behind the post and the one thing to do next.
Sample: 4,045 carousels where every slide and caption was readCaptions that send people to a link did worse. Sending people away from the post is the opposite of what makes it travel.
Do this: Keep the action on the post: a save, a send, a comment.
Sample: 4,045 carousels where every slide and caption was readFive things people argue about that barely move the number.
No niche is locked out: every one sits between 18% and 30%. Share of carousels that doubled their creator’s usual, 10,743 carousels.
Every carousel in the library beat its creator’s usual, from 211 creators across 17 niches. Open any one, see every slide, and press Make it your own to get the slides plus a ready-made prompt for ChatGPT or Claude. That’s how I made the one in the reel.
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