Nucleus by Atomically

The Design Review App

One brief. Several designs in real HTML, not pictures. You pick.

  • Several directions in real HTML, side by side
  • You pick. A model never picks for you
  • Checked against 13 email gates and 9 static-site gates
  • Nucleus does not train on your data
Join the waitlistSee how it works
13
Email gates
The gates an email is checked against
9
Static-site gates
The gates a static site is checked against
3
Kinds of output
Email, static site, WordPress theme
1
Never passes locally
The email gate that can never pass locally, and says so
The live wall

Several directions, running side by side

Not one result you keep regenerating. Every direction is real HTML, and you compare them on one wall.

  • Each direction is real HTML, not a picture of one
  • Genuinely different directions from one brief
  • Your pick is the only label
See how it works
  • A still of a sample direction: demo-analogous-rotate-split-hero-14d3
    demo-analogous-rotate-split-hero-14d3static9 gates
  • A still of a sample direction: demo-high-contrast-breathe-centered-stack-9cc4
    demo-high-contrast-breathe-centered-stack-9cc4static9 gates
  • A still of a sample direction: demo-pastel-drift-bento-84dd
    demo-pastel-drift-bento-84ddstatic9 gates

sample directions

How it works

Brief, directions, wall, pick, verify

One brief fans out. You compare and pick. What ships is checked.

  1. Brief
    Say what you want built, and for which target.
  2. Directions
    One brief fans out into several genuinely different directions, each one real HTML.
  3. Wall
    Compare them side by side on one live wall.
  4. Pick
    You pick. A model never picks for you.
  5. Verify
    What ships is checked against the target's gates, which say what they could not check.
We say what we cannot verify

Checked against the gates. Where a gate cannot measure, it says so.

Every gate returns one of three outcomes: pass, fail or could not measure. A run where nothing failed but something could not be measured is incomplete. Outlook cannot be rendered locally, so an email's best verdict is incomplete, and Nucleus says so.

  • A gate that cannot measure is never counted as a pass
  • Every reason is written down, next to the gate
  • The same gates run on every direction you pick
Join the waitlistWhat incomplete means

Verify: email

every gate at its best

incomplete
  • email.sizepass
  • email.no-script-or-externalpass
  • email.inline-stylespass
  • email.table-layoutpass
  • email.imagespass
  • email.widthpass
  • email.preheaderpass
  • email.dark-modepass
  • email.compliance-footerpass
  • email.tokens-only-colorspass
  • email.plain-textpass
  • email.chromium-renderpass
  • email.client-rendercould not measure

    Outlook (Word engine), Gmail and Apple Mail rendering cannot be reproduced locally. Check the email in real clients, or a rendering service, before it is sent.

Not a recorded run: the email gates in the order Nucleus runs them. A run is a pass only when every gate passes, and email.client-render can only answer could not measure, so this is the best an email can get: incomplete.
What it builds

For a static site, the thing on the wall is the thing that ships

The direction you pick is finalized into its target and checked against that target's gates. Email, static sites, and WordPress themes for self-hosted WordPress and WordPress.com.

  • Self-contained, with no network request
  • Reduced motion honoured, with one steady frame
  • Colours from the design tokens only
See how it works

Static site gates

the gates a static site is checked against

  • Self-containedstatic.self-contained
  • Reduced motionstatic.reduced-motion
  • Tokens-only coloursstatic.tokens-only-colors
  • Document basicsstatic.document-basics
  • No networkstatic.no-network
  • SEOstatic.seo
  • Core Web Vitalsstatic.core-web-vitals
  • Deterministic framestatic.deterministic-frame
  • Accessibility, by axestatic.axe
The list of gates, in the order they run. Not a result: every run reports its own.
For freelancers

The approver signs off one look, and it is recorded

For builders shipping alone, and for freelancers whose client has the last word. Invite your client with a single-use token. They comment, vote and approve a look.

  • The approval pins the exact HTML by its sha256
  • It records which account approved, on what basis, and when
  • Never edited: a new look is a new round and a new approval
Join the waitlistHow a round works for freelancers

Approval

append-only, one per direction per round

sample record
Approved by
A client, the signatory (illustrative)
Basis
signatory
When
2026-10-06 14:32 UTC
Round
2
Direction
demo-high-contrast-breathe-centered-stack-9cc4
sha256
e3f1a9c0b7d24e6f8a1c5b9d0e7f2a4c6b8d1e3f5a7c9b0d2e4f6a8c1b3d5e7f
Note
This one. Keep the type as it is.
The shape of an approval as Nucleus stores it. Every value here is illustrative.
Trust

What Nucleus does not do

Claims we can keep, and nothing else.

  • Does not train on your data
  • Every preview runs apart from the app
  • No fetches or form posts from a preview
  • A model never picks for you
What holds each promise
Plans

Free, Builder and Studio

What each plan includes. Prices at launch.

Free

For trying it, or for a builder who already has a design.

Prices at launch
  • Upload a design you already have
  • The review flow, with one invited approver
  • A recorded sign-off
  • The gates that apply to the upload
Join the waitlist
For the solo founder

Builder

Generated directions, the wall and a verified export.

Prices at launch
  • Directions generated from a brief, within a monthly allowance
  • The live wall
  • Verified export: email, static site, WordPress theme
  • A brand-voice sample
Join the waitlist

Studio

For the freelancer with clients.

Prices at launch
  • A higher allowance than Builder
  • Several brands
  • Several client approvers per project
Join the waitlist

What each plan includes may change before launch.

Compare the plans in one table
Questions

Straight answers

Is it open yet?
Not yet. Join the waitlist to hear when Nucleus opens.
What does it build?
Email, static sites, and WordPress themes for self-hosted WordPress and WordPress.com. Each is checked against its own gates: 13 for an email, 9 for a static site.
Do you train on my data?
No. Nucleus does not train on your data. Your briefs, picks, comments and approvals are yours, and nothing trains on them.
What does "incomplete" mean?
Every gate returns pass, fail or could not measure, and a gate that could not measure is never counted as a pass. A run where nothing failed but something could not be measured is incomplete. Outlook cannot be rendered locally, so the best an email can get is incomplete, and Nucleus tells you so rather than calling it a pass.
What will it cost?
Prices at launch. There will be three plans, Free, Builder and Studio, and no number until prices exist.

See several real directions before you commit to one

Nucleus is not open yet.

Join the waitlist