· 8 min read
Instagram and TikTok carousels for apps: the complete playbook
How to make Instagram and TikTok carousels for your app: slide structure, 3:4, 1:1 and 9:16 sizes, slide copy rules, the last-slide CTA and per-platform tips.
- carousels
- tiktok
- app marketing
An app carousel works when it reads like a short argument: a hook cover that names the viewer's problem without naming the app, a few slides that move from problem to insight to solution, and a last slide that shows the real app with its icon, a screenshot and a download call to action. Use 3:4 portrait for the Instagram feed and 9:16 for TikTok photo posts, and give every slide one idea and one short headline.
What is a carousel post?
A carousel is a single post made of several images that people swipe through. On Instagram it's a multi-image post. On TikTok it's a photo post, sometimes called photo mode. Most other networks support multi-image posts too, though each displays them a little differently.
For apps, carousels have two advantages over video. They're cheaper and faster to make, so you can test more angles. And the viewer moves through the argument at their own pace, which suits apps that solve a problem in a few clear steps.
What should each slide of an app carousel do?
Think of a carousel as the 5-beat video structure laid out as slides. Each slide has one role:
| Slide | Role | What goes on it | Avoid |
|---|---|---|---|
| 1 | Hook cover | The viewer's problem or tension, in one line | Your app name or logo |
| 2 | Problem | What the problem costs them | Statistics you can't source |
| 3 | Insight | A reframe they would agree with | Feature names |
| 4 | Solution | How the app acts on it, with real UI | A list of five features |
| Middle slides | Details | One more fact from the listing per slide | Anything that isn't on the listing |
| Last | App | Real icon, real screenshot, download call to action | More than one call to action |
Why the cover never shows your app name or logo
The cover competes with everything else in the feed, from friends' photos to creators' videos. A logo on it says "ad" before anyone has a reason to swipe. A problem on it says "this is about you". The app gets its moment on the last slide, after the viewer has followed the argument.
Example: a five-slide carousel for a UGC ad app
Here's a real carousel made for the app Como: AI Product Ad Maker, aimed at small brand owners who want UGC-style (user-generated content) product videos but have no one to put on camera:
- Hook cover: "Camera-shy? Your product can still talk."
- Problem: "Creator fees eat your whole ad budget."
- Solution: "Start with one product photo."
- How it works: "Copy what works, with your product."
- App: the real icon, a real screenshot and a download call to action.
Five slides, one idea each. The cover names a worry specific to this audience. Slide two rules out the expensive options they've already given up on. Slides three and four explain the mechanism, one line each. The last slide is the app. Nothing is spent on a feature list.
How to make an app carousel, step by step
- Write a two-line brief. Who is this for, and when does the problem show up for them?
- Pick one problem from your listing. One carousel makes one argument.
- Write the cover line first. If the hook doesn't stop you, nothing after it matters.
- Write the middle slides. Problem, insight and solution, one idea per slide.
- Build the last slide from real assets. Your icon, a real screenshot, a one-line promise and one call to action.
- Choose the ratio for the platform you'll post on, then make the images in one consistent style.
- Write the caption and hashtags, and run the checklist at the end of this guide before you post.
How many slides should an app carousel have?
Use the fewest slides that still make the argument. If you can delete a slide and the story still works, delete it.
| Slides | Good for | Watch out for |
|---|---|---|
| 3 | One sharp idea or a single feature | No room for an insight |
| 4 to 6 | Hook, problem, insight, solution, app | Fits most apps |
| 7 to 10 | Step-by-step guides or several use cases | Every slide has to earn the swipe |
ReelMyApp lets you pick anywhere from 3 to 10 slides.
What size should a carousel be: 3:4, 1:1 or 9:16?
Pick the ratio per platform, not per carousel.
| Ratio | Use it for | Why |
|---|---|---|
| 3:4 portrait | Instagram feed, Facebook, Threads, Pinterest | Takes up more of the screen than a square in a feed |
| 1:1 square | LinkedIn, X, cross-posting | Displays without awkward crops almost everywhere |
| 9:16 vertical | TikTok photo posts, Stories | Fills the whole screen |
Two practical notes. A 9:16 slide posted to a feed is likely to be cropped, so you lose its top and bottom. And on full-screen formats, the platform's buttons and caption sit over the bottom and right side of the image, so keep headlines toward the middle. For Pinterest, 3:4 is the closest of the three to a classic tall pin.
Slide copy rules that keep people swiping
- One idea per slide. If a headline needs "and", split it into two slides.
- Keep headlines short. Aim for under ten words. A body line is optional, and one short sentence at most.
- End each slide with a reason to swipe. An open loop, a line that raises a question the next slide answers, keeps thumbs moving.
- Use the viewer's words. "Dinner at 9 p.m. again" beats your feature's name.
- Use only facts from your listing. No invented numbers, rankings, prices or reviews.
- Save the app name for the end. The cover never shows it. The last slide always does.
- Leave margins. Keep text away from the edges, where the platform's own buttons and labels sit.
- Read the headlines with the images hidden. If the words alone don't tell the story, rewrite them.
For cover lines, these hook formulas work for slides as well as videos.
How to design the last slide and its call to action
The last slide is where the viewer decides. It should show four things: your real app icon, a real screenshot, a one-line promise and one call to action.
Real assets matter here. A screenshot of the actual app shows people exactly what they'll get, and the real icon is what they'll look for in the App Store.
The right call to action depends on the platform, because links in Instagram and TikTok captions generally aren't clickable:
| Call to action | Best on | Notes |
|---|---|---|
| "Link in bio" | Instagram, TikTok | Only if your bio link goes straight to your App Store page |
| "Search [App name] on the App Store" | Anywhere | Use the exact name from your listing |
| "Get it free on the App Store" | Anywhere | Only if your listing says the app is free |
| A direct link | Facebook, LinkedIn, Threads, X, Pinterest | Put the link in the post or pin itself |
How to keep every slide on brand
A carousel should look like it came from your app, not from a template. Pull the palette from your icon, keep the same type and layout on every slide, and let the real screenshot on the last slide feel like part of the set.
ReelMyApp builds a separate art direction for each carousel from your app's icon and screenshots, and lets you choose the quality:
| Quality | Credits per slide, per language | Use it for |
|---|---|---|
| Draft | 1 | Testing hooks and angles cheaply |
| Standard | 2 | Regular posting |
| HD | 5 | Your most important posts (Pro and Studio plans) |
Each carousel also costs a flat 5 credits, so a six-slide Standard carousel in one language comes to 5 + 12 = 17 credits. New accounts get 20 free credits after verifying their email, which means you can sign up and make one for your own app before you look at the plans.
Platform-by-platform tips for app carousels
| Platform | Ratio | Caption | Link |
|---|---|---|---|
| 3:4 | Hook in the first line, before "more" | Link in bio, or tell people what to search | |
| TikTok | 9:16 | Words people would type into search | Bio link if your account has one, or a search line |
| 1:1 | More context, framed around work | Direct link | |
| 3:4 or 1:1 | Short and conversational | Direct link | |
| 3:4 | A keyword-rich title and description | The pin links to your App Store page | |
| Threads | 3:4 or 1:1 | Conversational, one topic tag | Direct link |
| X | 1:1 | One or two short lines | Direct link |
On LinkedIn, many people upload carousels as a PDF document so the slides swipe like a deck. On Instagram, the first line of the caption matters almost as much as the cover, because it's what shows before the cut-off. The captions and hashtags guide covers each platform in more detail, and the localization guide covers posting the same carousel in several languages.
Treat the table as a starting point. Platforms change how they show images and links, so check a test post on your own phone before you commit to a format. Each ReelMyApp carousel also comes with an analysis of the audience, their problem and the outcome they want, one core message, and a ranked list of these seven platforms with how to post on each and the best day and time window.
Carousel checklist before you post
- The cover names a problem or tension and doesn't show your app name or logo.
- Every slide has one idea and a headline under ten words.
- Each slide gives a reason to swipe to the next.
- Every claim is on your App Store listing.
- The last slide shows your real icon, a real screenshot and one call to action.
- The ratio matches the platform: 3:4 for the Instagram feed, 9:16 for TikTok.
- Headlines sit clear of the platform's buttons and captions.
- The caption opens with a hook line and ends with the same call to action as the last slide.
Key takeaways
- Structure app carousels like an argument: hook cover, problem, insight, solution, app.
- Keep the app name and logo off the cover; the last slide always shows the real app.
- Four to six slides suit most apps. Cut any slide the story doesn't need.
- Use 3:4 for the Instagram feed, 9:16 for TikTok and 1:1 for LinkedIn and X.
- One idea per slide, headlines under ten words, facts only from your listing.
- Match the call to action to each platform's link rules.
Frequently asked questions
What size should an Instagram carousel for an app be?
3:4 portrait is a safe default for the Instagram feed because it takes up more of the screen than a square. Use 9:16 for TikTok photo posts and 1:1 for LinkedIn and X.
How many slides should an app carousel have?
Four to six slides fit most apps: a hook cover, problem, insight, solution and app. Use three for a single sharp idea and up to ten for step-by-step guides.
Should my app logo be on the first slide?
No. A logo on the cover makes the post read as an ad before anyone has a reason to swipe. Put the problem on the cover and the app on the last slide.
What should the last slide of an app carousel include?
Your real app icon, a real screenshot, a one-line promise and a single call to action, such as link in bio or a line telling people to search for the app by name on the App Store.
Can I post the same carousel on Instagram and TikTok?
You can reuse the copy, but make a 3:4 version for the Instagram feed and a 9:16 version for TikTok so neither one gets cropped.
How much does a carousel cost in ReelMyApp?
5 credits plus 1, 2 or 5 credits per slide per language for Draft, Standard or HD quality. A six-slide Standard carousel in one language costs 17 credits.