For creators & social-media managers

See it before
you post it.

Contentbuilder is the Mac & iPhone app for making social content. Edit photos and video, write the caption, and preview your post exactly as it will look on six platforms — before it ever goes live.

Get early access See how it works

Made for macOS 15 and iOS 18 · No account needed to try · Private by design

contentbuilder Rooftop · New York
4:5

contentbuilder Golden hour on the rooftop 🌇 shot, edited and previewed in one place. #contentcreator #sunset #reels … more

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3 hours ago

Realistic sample engagement — a preview, not live analytics.

Six platforms. Fifteen surfaces. One post, previewed the way each app really shows it.

Instagram Feed Instagram Story Instagram Reel Instagram Grid TikTok For You TikTok Story X Tweet X Vertical Snapchat Snap Snapchat Spotlight WhatsApp Status WhatsApp Chat
The preview is the point

What you see is what gets posted.

Every format renders the way the platform will actually show it — the real headers, action bars and colours — so captions never get clipped, faces never land under the UI, and a 9:16 Story is framed right the first time.

Pixel-faithful chrome

Not a generic frame — each preview reproduces that app's own interface, down to the exact brand colours, verified seals and reaction bars. Instagram's blue hashtags, X's photo mosaic, Facebook's six reactions, WhatsApp's forwarded-in-a-chat view — all there.

The buttons actually work

Tap like, save, follow or repost and the preview responds — the count ticks by one, exactly like the real thing.

Light and dark, automatically

Feed surfaces match the viewer's appearance; Stories and Reels stay white-on-media — just like the apps.

Numbers formatted per app

Realistic, stable sample counts — grouped like “1,248” on Instagram, abbreviated like “12.4K” on TikTok. Placeholders to judge layout, never fake analytics.

Tap into it, full screen

Blow the preview up to an immersive, black-backdrop view that feels like you're inside the app — and flip between platforms and surfaces without leaving it. Sound plays too, looping like a real Reel.

Make it, don't just post it

A real editing studio, on your device.

Crop, colour, trim and caption without leaving the app — and without a single frame leaving your Mac or iPhone. Every edit is non-destructive until you tap Done.

Photo editor

Pan-and-zoom crop with the four social aspect ratios, 8 one-tap filters, and fine Exposure / Contrast / Saturation / Warmth sliders. Exports full-resolution, never the downscaled preview.

Video editor

Scrub a Photos-style filmstrip, drag the in/out handles, mute a clip, and export. When it can, it trims losslessly with no re-encode — fast, and no quality lost.

Text & stickers

Drop non-destructive text over photo or video — 4 styles, 4 fonts and a curated colour palette, each overlay free to move, rotate, and appear only when you want it to.

Caption templates

Reusable captions with smart tokens like {title}, {platform} and {weekday} that fill themselves in. Save your go-to hashtag groups once and drop them into any post.

On-device AI

Smart tools that never phone home.

Captions, silence removal and hook-writing all run on your iPhone or Mac with Apple's frameworks. Your video and audio never leave the device — it's enforced in the code, not just a promise.

💬 Auto captions

this changed everything

Turn speech into word-timed subtitles in seconds, pick a style, tweak the wording, then burn them in. Recognised entirely on-device — there's no server fallback, by design.

✂️ Remove silences

Remove 5 pauses · save 0:141:20 → 1:06

Contentbuilder finds the dead air and stitches the good parts back together. Drag one sensitivity slider and watch the cut count update live — before you commit. All of it on your device.

✨ AI overlay text

  • Wait for it…
  • The one thing nobody tells you
  • Save this for later 📌

Stuck on a hook? Apple Intelligence writes punchy on-image text right on your device. No Apple Intelligence? You still get instant, caption-aware suggestions — the button never comes back empty.

Powered by Apple's Speech framework and Apple Intelligence — no cloud AI, no accounts, no uploads.

How it works

Three steps from idea to posted.

No accounts to connect, no permissions to grant a stranger. Contentbuilder does the making and the checking — you keep the final tap.

  1. Compose & edit

    Import photos and clips (up to 10 at a time), crop and colour them, trim video, add text, and write the caption — with templates and saved hashtag groups a tap away.

  2. Preview everywhere

    Flip the same post through Instagram, TikTok, Snapchat, Facebook, X and WhatsApp in faithful chrome. A live readiness check flags anything over a caption or hashtag limit before you post.

  3. Hand off to post

    One tap copies your caption, saves the media to Photos or a folder, and opens the app — ready to paste and share. Honest by design: Contentbuilder prepares the post, you press publish.

Plan it, sync it

Your whole calendar of content — on every device.

Line up what's going out and when, then pick up on the other device exactly where you left off. Nothing goes out on its own; you stay in control.

A planner, grouped by day

See everything you've scheduled, grouped by day, each with the platforms it's headed to. Set a reminder — at post time, 15 minutes or an hour before — so the right moment never slips. It's a local notification on your device, not a bot posting for you.

Mac and iPhone, one library

Start a post on your Mac, finish it on your phone. Your posts, media, templates and hashtag groups sync through your own private iCloud — no separate account, and if you're signed out it simply works locally on that device.

Private by design

Your content stays
your content.

Every edit, every caption, every frame of video is processed on your Mac or iPhone. Captions are transcribed on-device with no server fallback. Sync runs through your own private iCloud. There's no Contentbuilder account, no upload, and nothing to opt out of.

  • Nothing is sent to us — there's no “us” server to send it to
  • Works fully offline — every edit and AI feature runs with no connection
  • Synced privately through your Apple ID, or kept local
No asterisks

What it does — and what it doesn't.

Straight talk beats a feature list that overpromises. Here's exactly where the line is.

What Contentbuilder does

  • Previews your post inside each app’s real look — before you publish
  • Edits photos and video on-device: crop, 8 filters, adjust, trim, mute, text
  • Writes captions from templates, and burns subtitles into video from speech — on-device
  • Checks every post against each platform’s caption and hashtag limits
  • Syncs your whole workspace privately across Mac and iPhone via iCloud

What it doesn't pretend to

  • Auto-post to the networks It hands off instead — copies your caption, saves the media, and opens the app. The platforms have no public posting API for personal accounts.
  • Publish on a schedule by itself “Scheduling” is a friendly reminder on your device. Your post never goes out without you.
  • Invent hashtags with AI You save your own reusable hashtag groups and drop them in — no guessing, no fluff.
  • Upload anything to our servers There are no Contentbuilder servers, no cloud AI, and no analytics. The AI is Apple’s, running on your device; sync is your own private iCloud.
6 platforms previewed Instagram · TikTok · Snapchat · Facebook · X · WhatsApp
15 faithful surfaces Feed, Story, Reel, Grid, For You, Tweet, Snap & more
8 photo filters plus crop, exposure, contrast, saturation & warmth
3 caption styles Bold, Clean and Pop — burned in on-device
0 bytes uploaded no server, no account, no telemetry

“I built Contentbuilder because I was tired of the publish-and-pray. I wanted to see the post — really see it, the way each app shows it — do the editing in one place, and keep everything on my own devices. It’s a small, honest app made by one person who cares about the craft. No dark patterns, no data grab. Just a good tool for making things you’re proud to post.”

Jarrel — maker of Contentbuilder

Make your next post
your best post.

Contentbuilder is on the way. Join the early-access list and we'll email your invite the moment it lands on the Mac App Store and the App Store.

By joining you agree to receive occasional launch updates. No spam, unsubscribe anytime.

Coming soon to theMac App Store Coming soon to theApp Store

Built for macOS 15 and iOS 18 · No account needed · Syncs privately over iCloud