{ "name": "Stack Auth", "slug": "stack-auth", "domain": "https://stack-auth.com", "sources": [ "yc" ], "branding": { "colorScheme": "dark", "fonts": [ { "family": "GeistSans", "role": "body" }, { "family": "SFMono-Regular", "role": "monospace" } ], "colors": { "primary": "#EDF0FF", "secondary": "#22C55E", "accent": "#6B5DF7", "background": "#131316", "textPrimary": "#131316", "link": "#6B5DF7" }, "typography": { "fontFamilies": { "primary": "GeistSans", "heading": "GeistSans" }, "fontStacks": { "heading": [ "GeistSans" ], "body": [ "GeistSans" ], "paragraph": [ "GeistSans" ] }, "fontSizes": { "h1": "72px", "h2": "48px", "body": "14px" } }, "spacing": { "baseUnit": 4, "borderRadius": "6px" }, "components": { "input": { "background": "#131316", "textColor": "#FFFFFF", "borderColor": "#2B2B2D", "borderRadius": "4px", "borderRadiusCorners": { "topLeft": "4px", "topRight": "4px", "bottomRight": "4px", "bottomLeft": "4px" }, "shadow": "none" }, "buttonPrimary": { "background": "#FFFFFF", "textColor": "#1A1A1E", "borderRadius": "4px", "borderRadiusCorners": { "topLeft": "4px", "topRight": "4px", "bottomRight": "4px", "bottomLeft": "4px" }, "shadow": "none" }, "buttonSecondary": { "background": "#1A1A1E", "textColor": "#FFFFFF", "borderColor": "#E4E4E7", "borderRadius": "4px", "borderRadiusCorners": { "topLeft": "4px", "topRight": "4px", "bottomRight": "4px", "bottomLeft": "4px" }, "shadow": "none" } }, "images": { "logo": "https://stack-auth.com/_next/static/media/stack-auth-logo.84c18f5e.svg", "favicon": null, "ogImage": "https://stack-auth.com/img/og-image.jpg", "logoHref": "/", "logoAlt": "Logo of Stack Auth" }, "__llm_logo_reasoning": { "selectedIndex": 0, "reasoning": "Selected #0 because it is visible, located in the header, links to the homepage, and the alt text matches the brand name 'Stack Auth'.", "confidence": 0.95, "source": "llm" }, "__llm_button_reasoning": { "primary": { "index": 2, "text": "Get Started", "reasoning": "Button #2 'Get Started' is likely the primary CTA due to its action-oriented text, which is commonly used for primary actions. It shares the same color group as other buttons but stands out due to its text." }, "secondary": { "index": 3, "text": "Sign in", "reasoning": "Button #3 'Sign in' is selected as secondary because it has a different background color (#1A1A1E) and serves a supportive action role." }, "confidence": 0.9 }, "personality": { "tone": "modern", "energy": "medium", "targetAudience": "developers and tech-savvy users" }, "designSystem": { "framework": "tailwind", "componentLibrary": "" }, "confidence": { "buttons": 0.9, "colors": 0.9, "overall": 0.9 }, "__llm_metadata": { "logoSelection": { "llmCalled": true, "llmSucceeded": true, "finalSource": "llm", "rawLogoSelection": { "selectedLogoIndex": 0, "selectedLogoReasoning": "Selected #0 because it is visible, located in the header, links to the homepage, and the alt text matches the brand name 'Stack Auth'.", "confidence": 0.95 } }, "buttonClassification": { "llmCalled": true, "llmSucceeded": true } } }, "images": [ { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/stack-auth/184c69e895.webp", "alt": "OAuth from First Principles - Stack Auth", "source_url": "https://stack-auth.com/blog/oauth-from-first-principles", "image_url": "https://stack-auth.com/img/posts/04/p10.png", "width": 3200, "height": 4610, "bytes": 1149479, "query": "site:stack-auth.com", "query_suffix": "site:stack-auth.com" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/stack-auth/292c059495.webp", "alt": "OAuth from First Principles - Stack Auth", "source_url": "https://stack-auth.com/blog/oauth-from-first-principles", "image_url": "https://stack-auth.com/img/posts/04/p6.png", "width": 3025, "height": 2840, "bytes": 891284, "query": "site:stack-auth.com", "query_suffix": "site:stack-auth.com" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/stack-auth/9aeac45b9a.webp", "alt": "Stack Auth", "source_url": "https://stack-auth.com/blog", "image_url": "https://stack-auth.com/_next/image?url=%2Fimg%2Fposts%2F06%2F06-thumbnail.png&w=3840&q=75", "width": 2164, "height": 910, "bytes": 581120, "query": "site:stack-auth.com blog", "query_suffix": "site:stack-auth.com blog" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/stack-auth/8d9a0b698d.webp", "alt": "OAuth from First Principles - Stack Auth", "source_url": "https://stack-auth.com/blog/oauth-from-first-principles", "image_url": "https://stack-auth.com/img/posts/04/p12.png", "width": 3210, "height": 1980, "bytes": 756865, "query": "site:stack-auth.com", "query_suffix": "site:stack-auth.com" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/stack-auth/69c0614064.webp", "alt": "Stack Auth", "source_url": "https://stack-auth.com/blog", "image_url": "https://stack-auth.com/_next/image?url=%2Fimg%2Fposts%2F03%2F03-thumbnail.jpg&w=3840&q=75", "width": 738, "height": 292, "bytes": 13498, "query": "site:stack-auth.com blog", "query_suffix": "site:stack-auth.com blog" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/stack-auth/b2648d7716.webp", "alt": "Blog & Updates", "source_url": "https://stack-auth.com/blog", "image_url": "https://stack-auth.com/img/og-image.jpg", "width": 2249, "height": 1569, "bytes": 2310574, "query": "site:stack-auth.com", "query_suffix": "site:stack-auth.com" } ], "font_resources": [ { "family": "GeistSans", "google_fonts_url": "https://fonts.google.com/specimen/GeistSans" }, { "family": "GeistSans", "google_fonts_url": "https://fonts.google.com/specimen/GeistSans" } ], "google_fonts_css": "https://fonts.googleapis.com/css2?family=GeistSans&family=GeistSans&display=swap", "font_download_note": "Not found on Google Fonts? Agent Instructions that you can follow if you have permission to use the fonts:\n\nCharacterQuilt.com suggests this flow that can help:\n\n1. Open the company's homepage in a browser with DevTools open.\n2. In the Network tab, filter by \"Font\" (or by extension: woff2, woff, ttf, otf).\n3. Hard-reload the page and click around (pricing, blog, careers) — some weights only load on specific routes.\n4. For each captured font URL: right-click → Save As to download the file locally.\n5. View the page's CSS (DevTools → Sources, or curl the stylesheet URLs) and copy out the matching @font-face declarations. Rewrite each `src: url(...)` to point to your local file path.\n\nProgrammatic alternative: load the URL with Playwright or Puppeteer, listen for `response` events whose `Content-Type` starts with `font/`, and write the body to disk. The CSS extraction step is the same.\n\nOnly do this if you have permission to use the brand assets — most proprietary fonts are licensed and may not be redistributable.", "page_url": "https://characterquilt.com/branding/stack-auth", "agent_instructions": "You are designing or implementing in Stack Auth's brand identity.\n\n# Brand profile\n- Company: Stack Auth\n- Source: https://stack-auth.com\n- Color scheme: dark\n\n# Colors\n- primary: #EDF0FF\n- secondary: #22C55E\n- accent: #6B5DF7\n- background: #131316\n- textPrimary: #131316\n- link: #6B5DF7\n\n# Typography\n- primary: GeistSans — https://fonts.google.com/specimen/GeistSans\n- heading: GeistSans — https://fonts.google.com/specimen/GeistSans\n\nLoad all fonts at once: \n\n# UI Components\n- input: background=#131316, textColor=#FFFFFF, borderColor=#2B2B2D, borderRadius=4px, shadow=none\n- buttonPrimary: background=#FFFFFF, textColor=#1A1A1E, borderRadius=4px, shadow=none\n- buttonSecondary: background=#1A1A1E, textColor=#FFFFFF, borderColor=#E4E4E7, borderRadius=4px, shadow=none\n\n# Brand voice\n- Tone: modern\n- Energy: medium\n- Audience: developers and tech-savvy users\n\n# Working with these fonts\nNot found on Google Fonts? Agent Instructions that you can follow if you have permission to use the fonts:\n\nCharacterQuilt.com suggests this flow that can help:\n\n1. Open the company's homepage in a browser with DevTools open.\n2. In the Network tab, filter by \"Font\" (or by extension: woff2, woff, ttf, otf).\n3. Hard-reload the page and click around (pricing, blog, careers) — some weights only load on specific routes.\n4. For each captured font URL: right-click → Save As to download the file locally.\n5. View the page's CSS (DevTools → Sources, or curl the stylesheet URLs) and copy out the matching @font-face declarations. Rewrite each `src: url(...)` to point to your local file path.\n\nProgrammatic alternative: load the URL with Playwright or Puppeteer, listen for `response` events whose `Content-Type` starts with `font/`, and write the body to disk. The CSS extraction step is the same.\n\nOnly do this if you have permission to use the brand assets — most proprietary fonts are licensed and may not be redistributable.\n\n# Full machine-readable profile\nhttps://characterquilt.com/branding/stack-auth.json", "page_markdown": "# Stack Auth Brand Identity\n\nA complete profile of **Stack Auth**'s visual system — colors, typography, components, and personality — extracted from https://stack-auth.com. Built for designers, agents, and AI tools.\n\n- Page: https://characterquilt.com/branding/stack-auth\n- Machine-readable JSON: https://characterquilt.com/branding/stack-auth.json\n- Per-page llms.txt: https://characterquilt.com/branding/stack-auth/llms.txt\n\n## Quick Facts\n\n| Field | Value |\n|---|---|\n| Primary | #EDF0FF |\n| Accent | #6B5DF7 |\n| Body Font | GeistSans |\n| Heading Font | GeistSans |\n\n## Color Palette\n\n- primary: #EDF0FF\n- secondary: #22C55E\n- accent: #6B5DF7\n- background: #131316\n- textPrimary: #131316\n- link: #6B5DF7\n\n## Typography\n\n- primary: GeistSans — https://fonts.google.com/specimen/GeistSans\n- heading: GeistSans — https://fonts.google.com/specimen/GeistSans\n\n## Visual Assets\n\n- Logo: https://stack-auth.com/_next/static/media/stack-auth-logo.84c18f5e.svg\n- Social card (og:image): https://stack-auth.com/img/og-image.jpg\n\n## UI Components\n\n- input: background=#131316, textColor=#FFFFFF, borderColor=#2B2B2D, borderRadius=4px, shadow=none\n- buttonPrimary: background=#FFFFFF, textColor=#1A1A1E, borderRadius=4px, shadow=none\n- buttonSecondary: background=#1A1A1E, textColor=#FFFFFF, borderColor=#E4E4E7, borderRadius=4px, shadow=none\n\n## Brand Personality\n\nTone: modern · Energy: medium · Audience: developers and tech-savvy users\n\n## Stack Auth Brand in the Wild\n\nReal-world brand assets — ads, campaigns, marketing materials.\n\n- **OAuth from First Principles - Stack Auth**\n - Image: https://stack-auth.com/img/posts/04/p10.png\n - Source: https://stack-auth.com/blog/oauth-from-first-principles\n- **OAuth from First Principles - Stack Auth**\n - Image: https://stack-auth.com/img/posts/04/p6.png\n - Source: https://stack-auth.com/blog/oauth-from-first-principles\n- **Stack Auth**\n - Image: https://stack-auth.com/_next/image?url=%2Fimg%2Fposts%2F06%2F06-thumbnail.png&w=3840&q=75\n - Source: https://stack-auth.com/blog\n- **OAuth from First Principles - Stack Auth**\n - Image: https://stack-auth.com/img/posts/04/p12.png\n - Source: https://stack-auth.com/blog/oauth-from-first-principles\n- **Stack Auth**\n - Image: https://stack-auth.com/_next/image?url=%2Fimg%2Fposts%2F03%2F03-thumbnail.jpg&w=3840&q=75\n - Source: https://stack-auth.com/blog\n- **Blog & Updates**\n - Image: https://stack-auth.com/img/og-image.jpg\n - Source: https://stack-auth.com/blog\n\n## Working with these fonts\n\nNot found on Google Fonts? Agent Instructions that you can follow if you have permission to use the fonts:\n\nCharacterQuilt.com suggests this flow that can help:\n\n1. Open the company's homepage in a browser with DevTools open.\n2. In the Network tab, filter by \"Font\" (or by extension: woff2, woff, ttf, otf).\n3. Hard-reload the page and click around (pricing, blog, careers) — some weights only load on specific routes.\n4. For each captured font URL: right-click → Save As to download the file locally.\n5. View the page's CSS (DevTools → Sources, or curl the stylesheet URLs) and copy out the matching @font-face declarations. Rewrite each `src: url(...)` to point to your local file path.\n\nProgrammatic alternative: load the URL with Playwright or Puppeteer, listen for `response` events whose `Content-Type` starts with `font/`, and write the body to disk. The CSS extraction step is the same.\n\nOnly do this if you have permission to use the brand assets — most proprietary fonts are licensed and may not be redistributable.\n\n## Machine-Readable Profile\n\n```json\n{\n \"colorScheme\": \"dark\",\n \"fonts\": [\n {\n \"family\": \"GeistSans\",\n \"role\": \"body\"\n },\n {\n \"family\": \"SFMono-Regular\",\n \"role\": \"monospace\"\n }\n ],\n \"colors\": {\n \"primary\": \"#EDF0FF\",\n \"secondary\": \"#22C55E\",\n \"accent\": \"#6B5DF7\",\n \"background\": \"#131316\",\n \"textPrimary\": \"#131316\",\n \"link\": \"#6B5DF7\"\n },\n \"typography\": {\n \"fontFamilies\": {\n \"primary\": \"GeistSans\",\n \"heading\": \"GeistSans\"\n },\n \"fontStacks\": {\n \"heading\": [\n \"GeistSans\"\n ],\n \"body\": [\n \"GeistSans\"\n ],\n \"paragraph\": [\n \"GeistSans\"\n ]\n },\n \"fontSizes\": {\n \"h1\": \"72px\",\n \"h2\": \"48px\",\n \"body\": \"14px\"\n }\n },\n \"spacing\": {\n \"baseUnit\": 4,\n \"borderRadius\": \"6px\"\n },\n \"components\": {\n \"input\": {\n \"background\": \"#131316\",\n \"textColor\": \"#FFFFFF\",\n \"borderColor\": \"#2B2B2D\",\n \"borderRadius\": \"4px\",\n \"borderRadiusCorners\": {\n \"topLeft\": \"4px\",\n \"topRight\": \"4px\",\n \"bottomRight\": \"4px\",\n \"bottomLeft\": \"4px\"\n },\n \"shadow\": \"none\"\n },\n \"buttonPrimary\": {\n \"background\": \"#FFFFFF\",\n \"textColor\": \"#1A1A1E\",\n \"borderRadius\": \"4px\",\n \"borderRadiusCorners\": {\n \"topLeft\": \"4px\",\n \"topRight\": \"4px\",\n \"bottomRight\": \"4px\",\n \"bottomLeft\": \"4px\"\n },\n \"shadow\": \"none\"\n },\n \"buttonSecondary\": {\n \"background\": \"#1A1A1E\",\n \"textColor\": \"#FFFFFF\",\n \"borderColor\": \"#E4E4E7\",\n \"borderRadius\": \"4px\",\n \"borderRadiusCorners\": {\n \"topLeft\": \"4px\",\n \"topRight\": \"4px\",\n \"bottomRight\": \"4px\",\n \"bottomLeft\": \"4px\"\n },\n \"shadow\": \"none\"\n }\n },\n \"images\": {\n \"logo\": \"https://stack-auth.com/_next/static/media/stack-auth-logo.84c18f5e.svg\",\n \"favicon\": null,\n \"ogImage\": \"https://stack-auth.com/img/og-image.jpg\",\n \"logoHref\": \"/\",\n \"logoAlt\": \"Logo of Stack Auth\"\n },\n \"__llm_logo_reasoning\": {\n \"selectedIndex\": 0,\n \"reasoning\": \"Selected #0 because it is visible, located in the header, links to the homepage, and the alt text matches the brand name 'Stack Auth'.\",\n \"confidence\": 0.95,\n \"source\": \"llm\"\n },\n \"__llm_button_reasoning\": {\n \"primary\": {\n \"index\": 2,\n \"text\": \"Get Started\",\n \"reasoning\": \"Button #2 'Get Started' is likely the primary CTA due to its action-oriented text, which is commonly used for primary actions. It shares the same color group as other buttons but stands out due to its text.\"\n },\n \"secondary\": {\n \"index\": 3,\n \"text\": \"Sign in\",\n \"reasoning\": \"Button #3 'Sign in' is selected as secondary because it has a different background color (#1A1A1E) and serves a supportive action role.\"\n },\n \"confidence\": 0.9\n },\n \"personality\": {\n \"tone\": \"modern\",\n \"energy\": \"medium\",\n \"targetAudience\": \"developers and tech-savvy users\"\n },\n \"designSystem\": {\n \"framework\": \"tailwind\",\n \"componentLibrary\": \"\"\n },\n \"confidence\": {\n \"buttons\": 0.9,\n \"colors\": 0.9,\n \"overall\": 0.9\n },\n \"__llm_metadata\": {\n \"logoSelection\": {\n \"llmCalled\": true,\n \"llmSucceeded\": true,\n \"finalSource\": \"llm\",\n \"rawLogoSelection\": {\n \"selectedLogoIndex\": 0,\n \"selectedLogoReasoning\": \"Selected #0 because it is visible, located in the header, links to the homepage, and the alt text matches the brand name 'Stack Auth'.\",\n \"confidence\": 0.95\n }\n },\n \"buttonClassification\": {\n \"llmCalled\": true,\n \"llmSucceeded\": true\n }\n }\n}\n```\n" }