NUL
A radical system for bookkeeping software: from app to invoice.
- Sector
- Financial software
- Our role
- Systematising an existing brand
- Disciplines
- Design system · Product design · Campaign
- Year
- 2026
The design system
The NUL system. In one folder.
04 Templates
Designed for what you make. You fill them in.
- deck.pptxpptx8,6 MB
- instagram-post.figfigTemplate
- story.figfigTemplate
- newsletter.htmlhtml24 KB
- business-card.pdfpdf220 KB
- poster.pdfpdf3,1 MB
- website.figfigFigma
The design system of NUL, a fictional concept study.
Made with the system
Bookkeeping · automatic
Bookkeeping that does itself.
Invoices, receipts and VAT. NUL handles it. You keep your time, and € 0.00 outstanding.
Start in two minutes→- invoices this month
- 1,284
- errors
- 0
- per receipt
- 12 s
- outstanding
- € 0.00
Invoice
- Number
- 2026-0412
- Date
- 13-11-2026
- Due
- 27-11-2026
| Description | Qty | Price | Total |
|---|---|---|---|
| Logo and identity | 1 | 1,600.00 | 1,600.00 |
| Templates, four | 4 | 150.00 | 600.00 |
| Advice | 2 | 150.00 | 300.00 |
- Subtotal
- € 2,500.00
- VAT 21%
- € 525.00
- Total
- € 3,025.00
made with nul
Zerohassle.
Brief
Design question: How do you make boring software look like the boldest brand on the block, without it feeling any less trustworthy?
NUL is fictional software that does the bookkeeping for freelancers and small businesses automatically: invoices, receipts, VAT. The name, the zero and the cobalt already existed and worked. But the app, the website, the invoices and the campaigns looked like four different companies. Every team made its own version.
Design thinking
We made the zero the protagonist. Not a logo in a corner, but an enormous image that falls off the edge: filled, outlined, sliced or in a strict grid. Around it, Swiss rigour: a visible grid, black and white, numbers as imagery. Cobalt means: sorted. Red only appears when something is still outstanding.
Design principles
The zero is the image
No stock photos of people with laptops. The zero carries every piece, always bigger than its frame.
Numbers are the hero
An amount of € 0.00 says more than a slogan. Figures are big, in fixed columns.
Colour has meaning
Cobalt is sorted, red is outstanding, black and white do the rest. Never decoration.
The grid is visible
Hairlines show the structure. Calm without being dull.
Typography and colour
€ 0.00 outstanding
Unbounded · The zero, headings and figures
Bookkeeping that does itself
Geist · Body text and interface
- CobaltBrand, actions, everything sorted
#1F2BFF - InkText, rules, navigation
#0A0A0A - WhiteBackground and paper
#FFFFFF - SignalOnly for what is still outstanding
#FF2E4C
Imagery and motion
Applications
The same identity, each time with its own composition. Designed for:
- Billboard
- Website
- App
- Invoice
- Pitch deck
- Social posts
- Business card
- Product page
Zerohassle.
- Train receipt€ 23.40
- Lunch receipt€ 18.90
- Q4 VAT prepared€ 0.00
A working digital application
The overview in the app uses exactly the same rules as the billboard: one big cobalt card with € 0.00, figures in fixed columns, and red only when something is outstanding.
What we keep
- The name NUL and the wordmark
- The cobalt
- The zero as a symbol
What we add
- The zero mark as an image system: filled, outlined, sliced, in a grid
- One fixed grid for app, web and documents
- Invoice, pitch and campaign templates
- Instructions for AI tools
Overview
November 2026- #0412Studio Vlak€ 1,250.00Paid
- #0411Bakkerij Korrel€ 3,025.00Paid
- #0410Atelier Noord€ 880.00Paid
- #0409Zeilschool Wad€ 450.00Paid
The system behind the work
Everything you see above is also in the library: with rules, variants and technical details. So a new maker, agency or agent can carry on straight away.
The handover package
- Start guideWhere to begin, the fastest route per task
README.md - What your brand stands forCharacter, tone and language, in Dutch and English
brand/ - Colours, type and sizesEvery choice with a name and a meaning
tokens/ - Logos, icons and imagesApproved, logically named and described
assets/ - TemplatesDecks, documents, posts and pages
templates/ - RecipesStep by step, for what you make often
recipes/ - Do and don’tExamples, with the reasons why
examples/ - Instructions for AI toolsSo any AI agent knows your brand
AGENTS.md - What changedEvery update, explained
CHANGELOG.md
A new application, with the same rules
Brief: “Create a social post for the new Scan Receipts feature, without a photo and with a four-word title.”
- Pick the "social post" recipe and the portrait format.
- The zero takes the place of the photo: six zeros in a grid, one in cobalt.
- The number in the title gets cobalt, the rest is black.
- Wordmark bottom right, on the hairline.
Curious what this means for your brand?
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