Show HN: Posters – open prompt dataset for generated poster design

4507 poster prompt specs — the exact structured text behind each image, paired with the finished example. Free to copy, adapt and ship. What this is Every poster on posterlet.com is generated from a structured prompt spec rather than a one-line description. Posterlet is an SI (superintelligence) poster generator, and this repository publishes 4507 of the specs behind its output — the exact text that produced each image — so you can see how layout, color, typography and subject are constrained separately, and copy the patterns into your own pipeline. All prompt text lives in data/, one JSON object per poster, split into one file per subcollection. The galleries below are the browsable index: every thumbnail links to the live, editable version. Each record looks like this: {"slug": "...", "title": "...", "collection": "halloween", "subcollection": "sale", "ratio": "9:16", "width": 1536, "height": 2752, "style": "3d", "tags": ["..."], "prompt": "[Format] ... [Colors] ... [Layout] ...", "image_md": ".../md/x.webp", "image_lg": "...", "image_full": "...", "page": "https://posterlet.com/poster/..."} Most specs are split into labelled sections, which is what makes the output reproducible: The infographic collection is the exception: those specs are a single narrative paragraph, because a whole-page diagram is easier to specify as one description than as independent blocks. Galleries Pages hold at most 40 images, so a large subcollection continues as -2.md, -3.md and so on. Linking to a single poster A poster's permanent URL is its posterlet.com page. The slug is the identifier, so the link stays valid however these files are re-split, re-ordered or re-paginated: https://posterlet.com/poster/halloween-event-schedule-infographic-poster Every thumbnail links there, and each record in data/*.jsonl exposes the same URL as page. Using these prompts Copy a spec, swap the [Subject] and [Headline] blocks, keep the structure. The section headers are the part that carries the weight — models follow [Layout] instructions far more reliably when the frame, palette and subject are already pinned down by their own sections. Text rendering (headlines, prices, tags) is the usual failure point: keep quoted copy short, explicitly name the type style, and state the position twice — once in [Layout], once in [Headline]. This repository is generated, never hand-edited. tools/sync.py pulls every public poster from the posterlet.com API and rebuilds the files; a scheduled GitHub Action re-runs it weekly. Prompt text is licensed CC BY 4.0 — use it commercially, just credit posterlet.com. Example images are SI-generated and remain hosted on posterlet.com; they are shown here for reference and are not included in the license.