Shareworthy - Instagram Caption Share Optimizer
Optimize your Instagram captions for shares and DM sends, the signals that actually drive reach in 2026, not likes.
Instagram's algorithm now prioritizes shares and DM sends over likes, but no existing tool helps creators optimize captions for these specific signals. Creators either waste money on $300-$800/month freelance caption specialists or write captions blindly optimized for outdated engagement metrics.
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The Business
$2.5-4B
Market Size
$49-$149
Global
Worldwide Potential
Customer
Solo Instagram creators and micro-agencies (1-5 people) earning $2K-$20K/month from Instagram-driven businesses who post 4-7 times per week and currently spend on freelance caption help or AI writing tools.
Pricing
Freemium SaaS with three tiers: Free (5 captions/month with basic share-scoring), Pro at $49/month (unlimited captions, voice training, SEO optimizer, batch mode), and Agency at $149/month (5 brand voices, team collaboration, competitor analysis, priority generation). Annual plans at 20% discount to improve retention.
$235K
Estimated Annual Revenue
400 customers at $49-149/mo
10% market capture
Features
Generates 3-5 caption variants from a content brief or image description, each scored 0-100 on predicted shareability based on share-triggering psychological patterns (relatability, utility, identity signaling, controversy, humor).
Analyzes captions for search-discoverable keywords that align with Google/Bing indexing of Instagram captions and Instagram's native search, suggesting keyword insertions that feel natural.
Breaks down any existing caption into share-trigger categories (save-worthy tips, relatable humor, hot takes, identity badges) and shows which triggers are present or missing.
Provides tested call-to-action templates specifically designed to prompt shares and DM sends rather than generic 'like and comment' CTAs.
Users paste 10-20 of their best-performing captions to train the AI on their voice, tone, and audience so generated captions match their brand.
Generate and schedule a week's worth of optimized captions in one session, exportable to clipboard or CSV for use in scheduling tools.
Users manually log shares, saves, and DM sends from Instagram Insights for each caption to build a personal performance dataset that improves future recommendations.
Paste a competitor's caption URL to analyze their share-trigger patterns, keyword strategy, and CTA approach with actionable improvement suggestions.
Suggests hashtags and alt-text optimized for discoverability that complement the share-optimized caption strategy.
Generate share-optimized captions directly from Instagram's web composer or scheduling tools without switching tabs.
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Tech Stack
apis
OpenAI GPT-5.3
Core caption generation engine with fine-tuned prompts for share-trigger optimization
Perplexity Sonar Pro
Real-time trending topic and keyword research for Instagram SEO suggestions
Stripe
Subscription billing for monthly/annual plans
backend
Next.js API Routes
Handle caption generation requests, user auth flows, and subscription management
Supabase Edge Functions
Background processing for batch caption generation and voice training model updates
hosting
Vercel
Fast global deployment with edge functions support for low-latency caption generation
database
Supabase
User accounts, saved captions, voice training data, performance tracking logs, and subscription state
frontend
5 Day Sprint UI
Component library built on shadcn/ui and Tailwind for rapid, polished UI development
Next.js 14
React framework for the web app with SSR for marketing pages and client-side interactivity for the caption editor
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Frequently Asked Questions
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