🎉 Just launched on the App Store — get 3 days of Pro free, no commitment.
iOS · Live on App Store

Captions in your voice — not AI’s.

Caption Coach AI learns how you actually write from real posts you’ve published, then writes Instagram, TikTok, LinkedIn, X, and Facebook captions that sound like you. Not generic. Not corporate. Not AI-shaped.

Download on the App Store How it works ↓

Free for your first 7 captions. Pro starts at $6.99/mo with a 3-day free trial.

Instagram
Three years ago I quit my job to teach yoga full-time. Today I made $47k less than I would have. And I’d do it all over again.
LinkedIn
Hot take: most “productivity advice” is procrastination with extra steps. Here’s what actually moved the needle this year —
TikTok
POV: you’re a creator who finally figured out that “just be yourself” is the most expensive advice you’ll ever ignore.
The problem

Every AI caption writer sounds the same.

Flat. Corporate. Vaguely upbeat. The kind of caption that could be about anything and gets engagement from no one. Your voice — the actual reason people follow you — gets buried under generic AI fluency.

Caption Coach fixes this the only way that works: it learns from your writing first, then writes like you.

Caption Coach vs. Generic AI

Why not just use ChatGPT?

Both technically write captions. Only one of them sounds like you.

ChatGPT / Generic AI GENERIC

  • Trained on the entire internet — generic by default
  • You re-paste your "voice samples" into every prompt
  • No platform-specific length, tone, or hashtag rules
  • One-size-fits-all output for IG vs LinkedIn vs TikTok
  • No archive of past captions
  • No mobile-first UX

Caption Coach AI YOURS

  • Trained on YOUR posts — your voice, your rhythm
  • Voice Memory auto-applies — never re-paste examples
  • Built-in platform conventions for IG/TikTok/LinkedIn/X/FB
  • 7 brand voices to swap mood instantly
  • Every caption auto-saved to your Folio archive
  • Native iOS app — open, type, share
How it works

Three steps. About five minutes.

Onboard once. Generate forever.

  1. Teach your voice

    Paste 1–3 real posts that sound like you. Your best-performing tweet, a LinkedIn rant, an Instagram caption you’re proud of. Caption Coach maps your rhythm, word choices, and tone.

  2. Compose your caption

    Pick a platform (Instagram, TikTok, LinkedIn, X, or Facebook). Type your topic in one line. Tap Compose.

  3. Refine with brand voices

    Don’t love the first take? Switch the brand voice — Casual, Professional, Provocative, Educational, Storytelling, Witty — and regenerate. Pro users get three regens per caption.

What you get

Built for creators who actually write.

Six things you’ll use every week.

  • Voice Memory

    Trained on YOUR posts, not the internet. Every caption gets sharper as Caption Coach learns more.

  • Five platforms, one tap

    Instagram, TikTok, LinkedIn, X, Facebook. Each platform’s native length, tone, and hashtag style respected.

  • Seven brand voices

    Original, Casual, Professional, Provocative, Educational, Storytelling, Witty. Match your mood.

  • Folio archive

    Every caption saved automatically. Search, copy, export to CSV (Pro). Build your content library effortlessly.

  • 3 regenerations per caption

    Pro users get three takes per caption. Free users get one. Pick the one that feels right.

  • Private by design

    Your voice samples stay on your device. No account, no email, no data sold.

Pricing

Free to try. Cheap to love.

No charge for the first 3 days of Pro. Cancel anytime in two taps.

Free
$0
forever
  • 7 captions total
  • 1 brand voice (Original)
  • 1 regeneration per caption
  • All 5 platforms
  • In-app Folio archive
Start free
Pro Annual
$39.99
per year · save 52%
  • Unlimited captions
  • All 7 brand voices
  • 3 regenerations per caption
  • Folio CSV export
  • 3-day free trial
Start free trial →
Pro Monthly
$6.99
per month
  • Unlimited captions
  • All 7 brand voices
  • 3 regenerations per caption
  • Folio CSV export
  • 3-day free trial
Start free trial
From the builder

My first paid iOS app.

“I’m a non-technical founder. Caption Coach is the fourth product I’ve shipped under Sun Ventures this year — and the first one people are paying for. I built it because every AI caption tool I tried made me sound like a different person. This one doesn’t.”

— KP Mistry, Sun Ventures
Frequently asked

Things people ask before downloading.

Does Caption Coach store my posts somewhere?
Your voice samples are stored locally on your device. The captions you generate are sent to Anthropic’s Claude API to produce a response, then returned. No account, no email required. See our Privacy Policy for the full breakdown.
How is this different from using ChatGPT or Claude directly?
Two reasons. First, Caption Coach is tuned to each platform’s conventions — Instagram captions, LinkedIn posts, and TikTok hooks each have their own rhythm, length, and structure, and the model is prompted accordingly. Second, your Voice Memory is automatically applied to every caption — so you’re not re-pasting examples each time you write.
What’s in the 3-day free trial?
The full Pro experience: unlimited captions, all 7 brand voices, 3 regenerations per caption, and CSV export of your Folio. Cancel anytime within the 3 days and you won’t be charged. Subscriptions renew at $6.99/month or $39.99/year after the trial ends.
How do I cancel my subscription?
Open Caption Coach AI → tap your profile (top-right) → tap "Manage Pro Subscription". It opens iOS Settings where you can cancel in two taps. Or anytime: Settings → your Apple ID → Subscriptions.
Is there an Android version?
Not yet. iOS is shipping now. Android is on the roadmap once we’ve learned what real users want from the iOS version. Join the newsletter above and I’ll send a note when the Android beta opens.
Who built this?
Caption Coach AI was built by Kalpesh Mistry, a non-technical founder operating Sun Ventures. It’s the fourth product shipped under Sun Ventures this year — and the first one with paid subscriptions.

Stop sounding like AI.

Three days free. Two seconds to download. Captions that finally sound like you.

Download on the App Store