PostBox

What it is

PostBox (https://postbox.sh/) is a macOS design-staging and social posting app aimed at interface designers and editors who finish work in Figma (or similar) and then lose half an hour opening each network’s feed just to ship the same asset. We verified the marketing site HTTP 200 on 2026-09-25. The product pitch: drop an export onto the MacBook notch (drag-and-drop “postcard”), write one caption, pick destinations, and blast the post to multiple networks without opening their feeds. Supported destinations called out on the public site include YouTube, Threads, Instagram, Bluesky, Dribbble, LinkedIn, and TikTok; the Product Hunt launch also mentioned X (with your own X API tokens), Pinterest, Behance, and Cosmos — treat the live site’s Platforms section as the source of truth for what ships in the build you download. The app is marketed as 100% local (no account required to use the core flow), supports multiple accounts per platform, carousels (up to four images), mid-post crop/cover tweaks, and scheduled posts. Pricing on-site: It’s Free — the founder states the whole product is free with no donation required.

Who it is for

Designers and visual editors who already obsess over pixel-level exports and hate the “open Instagram → get sucked into the feed → forget to post” loop. Useful when the hard part is staging and multi-network delivery, not generating the creative. If you want a fully autonomous AI social agent that invents captions and posts while you sleep, PostBox is the wrong shape — the founder explicitly points makers toward agent tools like Postiz / Post-Bridge for that job and positions PostBox as the human, local, drag-drop path. Requires macOS 15 or later; not a browser web app.

Why we listed it

Fresh public launch: Product Hunt featured PostBox on 2026-09-05 (~#7 Product of the Day, ~113 upvotes / ~12 comments on hunted.space coverage), live site verified 2026-09-25. Our board is still Dev-tools heavy; PostBox adds a Design niche Mac workflow (notch drag-drop → multi-network post) distinct from Causal (pre-execution AI canvas), Screenify Studio / Polishory (ASO/screenshot polish), and PixelCrew (agent HTML/design systems). Free forever positioning + local-first posture are honest for indie designers who will not pay another SaaS seat just to leave the feed alone.

Caveats

We have not run a full multi-network schedule on our own Mac, stress-tested carousel crops across every destination’s aspect-ratio rules, or verified long-term reliability of X API token posting. Platform availability can lag the marketing list — re-check https://postbox.sh/ Platforms before you depend on a specific network. macOS 15+ is a hard gate. Early-product risk: whether “never open a feed” stays true once a destination’s OAuth or API breaks, and whether free forever remains sustainable for Stratus Ventures LLC. Name collisions exist elsewhere on the web (unrelated creator-monitoring and VFX shops also brand “Postbox”) — always send makers to postbox.sh.