Design System Inspiration of Heptabase

1. Visual Theme & Atmosphere

Heptabase is a visual note-taking and knowledge-management app built around an infinite whiteboard of cards, and its marketing site mirrors that product ethos: calm, paper-like, and almost editorial. The canvas is a warm off-white (#f7f7f7) rather than pure white, and content sits on it as a quiet field of cards. There is essentially no chroma in the chrome — text and the primary call-to-action both live in the same near-black ink (#2e2e2e), never a hard #000000 for display, which gives the page a soft, printed-on-paper weight instead of a screen glare. The whole surface reads like a tidy desk: lots of whitespace, restrained neutrals, and a tight visual hierarchy where the eye is guided by type weight and spacing, not color.

The typographic personality is the system's defining move. Display headlines run in Instrument Sans Medium (weight 500) at large sizes — 48px on the hero with an unusually tight -1.584px tracking — which compresses the line into a confident, designerly block ("Master anything you learn. Do your best research and thinking."). Everything functional — nav, body, buttons, pricing copy — drops to Inter at weight 400–500, the workhorse UI face. This split of a characterful display sans over a neutral text sans is the same discipline you see in well-made knowledge tools: expressive where it sets the thesis, invisible where it serves reading. As a Taipei-built product that ships in English first but serves a Traditional-Chinese-reading team and audience, CJK glyphs fall through Inter to the platform stack (PingFang TC / Noto Sans TC), so 繁體中文 renders in the OS's native hanzi face rather than a bundled webfont.

What distinguishes Heptabase from louder SaaS sites is its refusal of elevation. Live inspection found box-shadow: none across the hero, nav, cards, and pricing columns — depth is built entirely from flat translucent fills and hairlines: a faint rgba(252,252,252,0.5) card tint over #fcfcfc, warm #f0f0ea feature tiles, and 1px rgba(0,0,0,0.08) borders. Geometry is gently rounded — 6px / 8px / 12px on cards, and a full 9999px pill for the dark CTA. Color appears in exactly two reserved roles: a clear interactive blue (#207dff) that highlights AI-feature phrases, and a single green (#75c33a) that marks pricing checkmarks. The result is a spatial-canvas product whose website feels like the inside of the app — a quiet board on which a few deliberate things have been placed.

Key Characteristics:

• Warm off-white canvas (#f7f7f7) instead of stark white — paper-like, low-glare
• Near-black ink (#2e2e2e) for both display text and the primary CTA — monochrome chrome
• Instrument Sans Medium (500) display with extreme tight tracking (-1.584px at 48px)
• Inter 400–500 for all functional/UI text; CJK falls through to system PingFang TC / Noto Sans TC
• Shadow-free: depth from translucent fills (#fcfcfc, #f0f0ea) + rgba(0,0,0,0.08) hairlines
• Single saturated blue (#207dff) reserved for AI-feature highlight text
• Green (#75c33a) used only for pricing checkmarks — never as a brand color
• Gentle radius ladder — 6px/8px/12px cards, full 9999px pill for the dark CTA

2. Color Palette & Roles

Primary

• Ink (#2e2e2e): The system's primary color — display headings, body emphasis, and the fill of the dark CTA pill. A soft near-black that reads as ink on paper, never the harsh #000000.
• Pure Black (#000000): Reserved for maximum-contrast moments — the active state of a sub-nav pill, the logotype link. Used sparingly.
• Pure White (#ffffff): White product-mock cards and text on the dark ink CTA.

Canvas & Surface

• Canvas (#f7f7f7): The page background — a warm off-white that frames every card.
• Surface Tint (#fcfcfc): Near-white card fill, frequently rendered at 0.5 alpha (rgba(252,252,252,0.5)) so the warm canvas reads faintly through it.
• Surface Warm (#f0f0ea): A warmer beige-grey for feature tiles and section panels — adds the "paper" warmth.
• Hairline (#e5e7eb): The default border token in the stylesheet; card and divider outlines more often use the translucent rgba(0,0,0,0.08) / rgba(0,0,0,0.14) variants over it.

Accent

• Accent Blue (#207dff): The single saturated interactive hue — highlights AI-feature phrases ("AI chat", "AI tutor", "Save 25%") and active/interactive emphasis. The product's only "this is special" color.
• Accent Green (#75c33a): Pricing checkmark color only — signals "included" in feature lists. Not a brand color and never used for chrome.

Text Hierarchy

• Ink (#2e2e2e): Primary text, headings, nav, strong labels.
• Muted (#6a6972): Secondary body copy, descriptions, captions.
• Muted Warm (#777169): Warm-grey alternate for inactive sub-nav pills and fine print.
• On Primary (#ffffff): Text on the dark ink CTA and on dark surfaces.

3. Typography Rules

Font Family

• Display: Instrument Sans (loaded as __instrumentSans) — all hero and section headlines, weight 500.
• Body / UI: Inter (loaded as __Inter) — nav, body, buttons, pricing, the document default at weight 400–600.
• CJK: no bundled hanzi webfont; Traditional-Chinese text falls through the Inter stack to the platform CJK face (PingFang TC on Apple, Noto Sans TC / Microsoft JhengHei on others).

Hierarchy

Principles

• Two faces, two jobs: Instrument Sans is the expressive display voice; Inter is the functional reading/UI voice. They never swap roles.
• Tight display tracking: headlines compress hard (-1.584px at 48px, -0.54px at 36px); body and UI stay at normal tracking. The compression is the brand's typographic signature.
• Soft-black ink, not pure black: display and body text use #2e2e2e, reserving #000000 for rare maximum-contrast accents.
• Medium weight as display weight: the hero runs at weight 500, not 700 — confidence through tracking and size, not heaviness.

4. Component Stylings

Buttons

Header CTA (Primary Pill)

• Background: #2e2e2e
• Text: #ffffff
• Radius: 9999px
• Padding: 8px 16px
• Height: 36px
• Font: 16px Inter weight 500
• Use: Header "Get started" call-to-action — the system's single solid pill

Hero / Pricing CTA (Rounded Rect)

• Background: #2e2e2e
• Text: #ffffff
• Radius: 10px
• Padding: 14px 24px
• Height: 48px
• Font: 16px Inter weight 600
• Use: Hero "Get started on mobile" and the featured pricing tier CTA

Ghost CTA

• Background: #fcfcfc
• Text: #2e2e2e
• Border: 1px solid rgba(0,0,0,0.08)
• Radius: 10px
• Padding: 13px 23px
• Height: 48px
• Font: 18px Inter weight 500
• Use: Secondary pricing-tier CTA on translucent fill

Inputs & Forms

Billing Toggle Segment

• Background: #ffffff
• Text: #2e2e2e
• Radius: 8px
• Padding: 6px 10px
• Height: 32px
• Font: 16px Inter weight 500
• Use: Monthly / Yearly (Save 25%) billing switch — active segment fills white, inactive text drops to rgba(0,0,0,0.32)

Cards & Containers

Pricing Card

• Background: #fcfcfc (rendered at rgba(252,252,252,0.5))
• Border: 1px solid rgba(0,0,0,0.08)
• Radius: 12px
• Use: Pricing tier column — translucent fill over warm canvas, no shadow

White Product Card

• Background: #ffffff
• Border: 1px solid rgba(0,0,0,0.14)
• Radius: 8px
• Use: White product-mock card in feature sections

Warm Feature Tile

• Background: #f0f0ea
• Border: 1px solid rgba(0,0,0,0.04)
• Radius: 8px
• Use: Warm beige feature tile on the canvas

Tabs / Sub-Navigation

Top Nav Item

• Text: #2e2e2e
• Radius: 8px
• Padding: 8px 12px
• Font: 16px Inter weight 400
• Use: Top navigation links (AI Tutor, Wiki, Download, Gallery, Pricing)

Sub-nav Segmented Pill

• Text: #777169 (inactive)
• Radius: 9999px
• Padding: 7px 22px
• Font: 13px Inter weight 500
• Active: text #000000 in a filled pill
• Use: Product sub-navigation segmented pills (Home / AI Tutor)

Accent Treatment

• Feature-highlight text: #207dff (blue) for AI-feature phrases
• Pricing checkmarks: #75c33a (green) for included-feature ticks
• Neither accent appears on buttons, borders, or chrome — color is information, not decoration

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Verified: 2026-06-17 (omd:add-reference CREATE — Tier 1 live inspect, 2 brand-owned surfaces) Tier 1 sources: https://heptabase.com (homepage, live computed-style inspect), https://heptabase.com/pricing (pricing page, live computed-style inspect), https://wiki.heptabase.com (Heptabase official Wiki — brand-owned, mission/manifesto source) Tier 2 sources: getdesign.md/heptabase — 404 "No designs found"; styles.refero.design/?q=heptabase — no matching results Conflicts unresolved: none

5. Layout Principles

Spacing System

• Base unit: 8px
• Scale: 4px, 8px, 12px, 16px, 24px, 32px, 48px, 64px
• Notable: nav items use a tight 8px 12px hit area; the dark CTA pill uses 8px 16px; large CTAs jump to 14px 24px for a comfortable touch target

Grid & Container

• Centered single-column hero anchored by the 48px Instrument Sans headline
• Feature sections present product mocks inside #fcfcfc / #ffffff cards on the warm canvas
• Pricing is a 3-column grid of equal #fcfcfc tier cards at 12px radius
• Warm #f0f0ea tiles arrange supporting features in a quiet sub-grid

Whitespace Philosophy

• Canvas as breathing room: the warm off-white #f7f7f7 field is generous; cards float on it with wide margins, echoing the app's infinite whiteboard.
• Flat segmentation: sections separate by surface tint (#fcfcfc vs #f0f0ea vs canvas) and hairlines, never by shadow.
• Hierarchy by type, not color: weight and size carry the structure so the palette can stay almost monochrome.

Border Radius Scale

• Small (6px): inner card elements, dense containers
• Medium (8px): nav items, white/warm cards, toggle segments
• Large (12px): pricing cards, large panels
• Pill (9999px): header CTA, sub-nav segmented pills

6. Depth & Elevation

Shadow Philosophy: Heptabase is a deliberately shadowless system. Live inspection found box-shadow: none across the hero, nav, feature cards, and pricing columns. Depth and grouping come entirely from flat translucent fills — a rgba(252,252,252,0.5) tint over #fcfcfc, warm #f0f0ea panels — and thin rgba(0,0,0,0.08) hairlines over the #e5e7eb base border. This keeps the marketing surface feeling like the product: a calm, paper-like board where cards sit flat and the user's attention is never pulled by artificial elevation. When emphasis is needed the system reaches for the dark ink (#2e2e2e) fill or the blue accent (#207dff), never a drop shadow.

7. Do's and Don'ts

Do

• Use a warm off-white canvas (#f7f7f7) instead of pure white — paper-like calm
• Use near-black ink (#2e2e2e) for display text and the primary CTA — keep chrome monochrome
• Set headlines in Instrument Sans Medium (500) with tight negative tracking (-1.584px at 48px)
• Use Inter weight 400–500 for all nav, body, and UI text
• Keep the system shadow-free — separate with #fcfcfc / #f0f0ea fills and rgba(0,0,0,0.08) hairlines
• Reserve blue (#207dff) for AI-feature highlight text only
• Use green (#75c33a) only for pricing checkmarks
• Fall CJK text through to the system stack (PingFang TC / Noto Sans TC) for 繁體中文

Don't

• Use pure black (#000000) for display or body text — reserve it for rare maximum-contrast accents
• Add drop shadows for elevation — Heptabase is flat and paper-like
• Spread the blue or green accents across chrome — they carry meaning, not decoration
• Set headlines in a heavy 700 weight — Medium 500 plus tight tracking is the voice
• Use Inter for big display headlines — Instrument Sans owns display
• Use a stark white page background — the warmth of #f7f7f7 is intentional
• Bundle a CJK webfont — let 繁體中文 render in the native OS hanzi face
• Use loud SaaS gradients or glassmorphism — the surface stays quiet and printed

8. Responsive Behavior

Breakpoints

Touch Targets

• Large CTAs at 48px height with 14px 24px padding — comfortably tappable
• Header pill CTA at 36px height, full radius for an unmistakable target
• Nav items at 36px height with 8px 12px hit area

Collapsing Strategy

• Hero: 48px Instrument Sans headline scales down on mobile, weight 500 maintained
• Pricing: 3-column tier grid collapses to a single stacked column
• Feature cards: multi-column → stacked single column
• Warm/white card surfaces maintain their fills and hairlines across breakpoints

Image Behavior

• Product-mock cards carry no shadow at any size, consistent with the flat system
• Cards maintain their 8px/12px radius across breakpoints
• Whiteboard/canvas screenshots sit inside #fcfcfc / #ffffff framed cards

9. Agent Prompt Guide

Quick Color Reference

• Primary text + CTA: Ink (#2e2e2e)
• Page background: Canvas (#f7f7f7)
• Card fill: Surface Tint (#fcfcfc)
• Warm panel: Surface Warm (#f0f0ea)
• White card: (#ffffff)
• Feature highlight: Accent Blue (#207dff)
• Pricing checkmark: Accent Green (#75c33a)
• Secondary text: Muted (#6a6972)
• Inactive pill text: Muted Warm (#777169)
• Border base: Hairline (#e5e7eb)

Example Component Prompts

• "Create a hero on a warm off-white background (#f7f7f7). Headline at 48px Instrument Sans weight 500, line-height 1.30, letter-spacing -1.584px, color #2e2e2e. Below it a dark CTA pill: #2e2e2e background, white text, 9999px radius, 8px 16px padding, 16px Inter weight 500."
• "Design a pricing card: #fcfcfc fill at 0.5 alpha, 1px solid rgba(0,0,0,0.08) border, 12px radius, no shadow. Tier title 24px Inter weight 600 #2e2e2e. Feature list 16px Inter #6a6972 with #75c33a checkmarks. Featured tier CTA: #2e2e2e background, white text, 10px radius, 14px 24px padding."
• "Build a warm feature tile: #f0f0ea background, 1px solid rgba(0,0,0,0.04) border, 8px radius. Title 36px Instrument Sans weight 500, letter-spacing -0.54px, #2e2e2e. Body 16px Inter #6a6972. Highlight 'AI chat' in #207dff."
• "Create a top nav on #f7f7f7. Inter 16px weight 400 links, #2e2e2e text, 8px radius hover tint. Dark pill 'Get started' CTA right-aligned: #2e2e2e, white text, 9999px radius."

Iteration Guide

1. Instrument Sans Medium (500) for headlines with tight tracking; Inter 400–500 for everything functional
2. Ink (#2e2e2e) is both the text and the action color — keep chrome monochrome
3. No shadows — separate with #fcfcfc / #f0f0ea fills and rgba(0,0,0,0.08) hairlines
4. Warm canvas #f7f7f7, never stark white
5. Blue (#207dff) only on AI-feature text; green (#75c33a) only on checkmarks
6. Gentle radius — 6px/8px/12px cards, full pill for the CTA
7. Let 繁體中文 render in the native system CJK face

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10. Voice & Tone

Heptabase's voice is calm, intellectual, and earnest — a tool for thinkers that speaks the way a good study partner does, plainly and with quiet conviction. The hero line "Master anything you learn. Do your best research and thinking." sets the register: aspirational about understanding, never gimmicky about productivity. Copy treats the user as a serious learner building something lasting, not a metrics target. The vision statement — "create a world where anyone can effectively establish a deep understanding of anything" — is the spine of every surface.

Voice samples (verbatim from live site, 2026-06-17):

• "Master anything you learn. Do your best research and thinking." — hero headline (learning-framed mission). (verified live homepage)
• "For anyone building a lifelong knowledge base." — Pro tier tagline (audience-named, plain). (verified live pricing)
• "Trusted by customers from the world's leading universities." — pricing social proof (understated). (verified live pricing)

Forbidden register: hustle-productivity hype, exclamation-heavy urgency, undefined buzzwords, "10x your output"-style claims, and anything that frames learning as a competition rather than a personal pursuit of understanding.

11. Brand Narrative

Heptabase was created by founder Alan Chan, who built the product around a single conviction: that genuine understanding is spatial and visual, not linear. The product is a visual note-taking and knowledge-management app whose core interaction is an infinite whiteboard of cards — you bring sources in, lay them out on a canvas, and make sense of them by arranging, connecting, and synthesizing rather than by stacking notes in a list. Its stated vision is to "create a world where anyone can effectively establish a deep understanding of anything."

Organizationally, Heptabase is a Taipei-based team — the founder and core team operate out of Taiwan, which is why this reference is classified country: TW by operating base. The company is incorporated in Delaware and went through Y Combinator's W22 batch, so the legal entity is US-registered; but the design culture, the team, and the day-to-day product work are Taiwanese, and the design-led founder's hand is visible in the restraint of every surface. (Classification follows operating base, not place of incorporation.)

What Heptabase refuses, visible in its design: the loud, gradient-heavy chrome of growth-stage SaaS and the dopamine-loop urgency of consumer productivity apps. What it embraces: a warm, paper-like canvas; a near-monochrome palette where color is reserved for meaning; expressive display type over a quiet text face; and a flat, shadowless surface that feels like the inside of the product — a calm board on which serious thinking can happen. The website is, deliberately, a demonstration of the product's thesis: that a well-arranged space helps you understand.

12. Principles

1. Understanding is spatial. The product's whole premise is that arranging knowledge on a canvas beats stacking it in a list. UI implication: lay content out as cards on a generous canvas; let space and adjacency carry relationships, not nesting depth.
2. Color is information, not decoration. The palette is near-monochrome so that the two accents mean something. UI implication: reserve blue (#207dff) for feature emphasis and green (#75c33a) for "included"; keep all chrome in ink and neutrals.
3. Calm over stimulation. A thinking tool should not compete for attention. UI implication: no shadows, no gradients, no urgency — a warm #f7f7f7 canvas and flat fills keep the surface quiet.
4. Type sets the thesis. Expressive display type states the idea; neutral text type serves the reading. UI implication: Instrument Sans Medium with tight tracking for headlines; Inter for everything that must simply be read.
5. Built to live with. Copy frames a "lifelong knowledge base," not a quick win. UI implication: design for durability and density of use, not for first-session delight; nothing should feel like a trend that ages in a year.

13. Personas

Personas below are fictional archetypes informed by publicly observable Heptabase user segments (university researchers, lifelong learners, knowledge workers building personal knowledge bases), not individual people.

Chen Yi-Hsuan, 27, Taipei. A graduate researcher synthesizing papers for a literature review. Lays each source as a card on a whiteboard and draws the connections between arguments. Chose Heptabase because the spatial canvas matches how she actually thinks, and because the interface stays out of the way.

Daniel Okafor, 34, London. A product strategist building a lifelong knowledge base from books, talks, and meeting notes. Values that the tool is calm and shadow-free — it feels like a desk, not a dashboard. Uses the AI chat to interrogate sources he has brought in rather than to generate filler.

Mizuki Tanaka, 22, Kyoto. An undergraduate using Heptabase as an AI tutor to master hard courses. Appreciates the plain, non-gamified tone and that the blue highlight reliably means "this is an AI feature." Reads 繁體中文 and Japanese content side by side and relies on the native system CJK rendering.

14. States

15. Motion & Easing

Durations:

Easings:

Motion rules: Motion is functional and quiet, consistent with the calm, paper-like aesthetic. Cards and panels fade-in from below at motion-standard / ease-enter; pills respond to press with a subtle scale/opacity shift. There is no bounce or spring — a thinking tool signals steadiness, not playfulness. On an infinite-canvas product, panning and zooming are direct and immediate rather than animated for show. Under prefers-reduced-motion: reduce, all transitions collapse to instant; the product remains fully functional.