CarouselKit: LinkedIn carousel to PDF maker - Sell Project

A browser-based LinkedIn carousel maker that exports a correctly sized PDF, with no sign-up and nothing uploaded to a server. A free tier plus a $19 lifetime Pro unlock by licence key, checked server-side by a small Cloudflare Worker. WHAT YOU GET Editor: templates, live text editing, slide reordering, themes and accent colours, brand footer Exact LinkedIn PDF sizing with an original, dependency-free PDF writer (no third-party libraries, fonts or images) Pro licensing built: a Cloudflare Worker (no dependencies) verifies Gumroad licence keys, rejects refunded, charged-back, disputed or cancelled keys, issues signed 7-day tokens, limits devices per key, and serves 6 premium themes only to valid tokens 18 Worker unit tests (passing, with mocks) Landing page, privacy and terms pages 27-second walkthrough video and 4 screenshots TECH Static HTML/CSS/JavaScript with no build step, deployable to any static host. One Cloudflare Worker plus KV (the free tier is enough). The buyer uses their own Gumroad account. WHY IT IS WORTH BUYING LinkedIn carousel tools get steady search traffic from creators, founders and B2B marketers. This one runs at $0/month and only needs a domain and a Gumroad product to start charging. TO LAUNCH Create the Gumroad product, deploy the Worker, fill in APIBASE and the buy URL (the README's Pro licensing setup takes about 15 minutes), then add a domain and Search Console. TRANSFER Source zip and git bundle (fresh repo) with SHA-256 checksums Handover guide and due-diligence report 30 minutes of email handover. Payment through Escrow.com No domain, accounts or revenue history included HONEST DISCLOSURES The code has been public on GitHub under the MIT licence since August 2026 (github.com/suncal/carouselkit). Copies made then remain MIT-licensed, so exclusivity over that version cannot be guaranteed. Pro is not live yet: no Gumroad product is configured, so the upgrade button shows 'opening soon'. The Worker was only tested with mocks, never against a live Gumroad product. The app is static, so a determined user could patch the client JavaScript to remove the watermark. The server check stops casual bypass and key sharing, and premium themes are only served to valid tokens. No traffic, users or sales. The name 'CarouselKit' has not been trademark-cleared. Not affiliated with LinkedIn. The live demo runs on the seller's GitHub Pages and is not part of the sale unless agreed.