This product was not featured by Product Hunt yet. It will not be visible on their landing page and won't be ranked (cannot win product of the day regardless of upvotes).
Hi Product Hunt — I’m the independent developer behind SAINO, and today I’m launching Prompt Canvas.
Prompt Canvas is a Windows design-handoff workspace for one recurring problem: screenshots are easy to share, but difficult to turn into precise implementation instructions.
A message such as “move this button, make the title clearer, and add more space” still leaves an AI agent or developer guessing. Which element should move? Where should it go? How much larger should it be? Which details are intentional, and what would count as finished?
Prompt Canvas lets you answer those questions visually. Import a screenshot, create the intended result on the canvas, then export both the visual reference and structured instructions for the next person or AI tool.
A practical screenshot-to-handoff workflow:
1. Import a PNG, JPEG, or WebP from a file, drag and drop, or the clipboard.
2. Edit the visible UI with drawing, erasing, text, arrows, circles, rectangles, highlights, blur, mosaic, crop, and image resizing.
3. Select a region of the screenshot, grab it, resize or duplicate it, and place it where the interface should actually be. Prompt Canvas repairs the original area using its surrounding colour so the result remains readable.
4. Add the reason, priority, before-and-after state, and acceptance criteria for each change.
5. Export a prompt, change JSON, annotated image, original image, shareable HTML report, or a handoff ZIP with a manifest and image checksums.
Prompt Canvas is not intended to be another general-purpose image editor. Its purpose is to make design intent usable by an implementation workflow. The canvas preserves coordinates, sizes, layer order, change details, and completion criteria.
Image editing, projects, autosave, saved versions, prompt generation, JSON generation, and exports run on the user’s PC. Screenshots are not automatically uploaded to SAINO or an AI provider. Blur and mosaic tools can hide private details before a handoff is created.
Direct AI analysis is optional and experimental. If a user intentionally configures a supported cloud provider or a local Ollama connection, Prompt Canvas shows the destination and content before sending. The core screenshot-to-prompt workflow does not require an AI account or API key.
Prompt Canvas is useful for founders, product managers, designers, developers, QA and support teams, and clients who need to communicate visual changes precisely.
Prompt Canvas 1.0.0 is proprietary software for 64-bit Windows 11. It supports Japanese and English, with an English installer. It is available as a one-time purchase for USD 29.99 internationally or JPY 4,980 including tax in Japan.
The current installer is not code signed, so Microsoft Defender SmartScreen may show an unrecognized-app warning. Customers receive the expected filename and SHA-256 checksum and should verify both before installation. The application source and installer remain private.
I would especially appreciate feedback on one question: when you hand a visual change to an AI agent or developer, which details are still most likely to be misunderstood?
No comment highlights available yet. Please check back later!
About Prompt Canvas on Product Hunt
“Turn UI screenshots into build-ready instructions”
Prompt Canvas was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #14 on the daily leaderboard. Prompt Canvas turns UI screenshots into clear, build-ready design instructions. Move interface elements, annotate changes, hide private details, define priorities and acceptance criteria, then export prompts, JSON, images, reports, or handoff ZIPs for AI agents and developers.
Prompt Canvas was featured in Design Tools (262.3k followers), User Experience (368k followers) and Developer Tools (518.8k followers) on Product Hunt. Together, these topics include over 158.7k products, making this a competitive space to launch in.
Who hunted Prompt Canvas?
Prompt Canvas was hunted by SAINO. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Prompt Canvas stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
SAINO