01 / Display Roboto Flex · GRAD −200..150 · 13 axes Live

EVERY WORD PAYS RENT

An AI copywriter for people who read closely. Kern drafts, cuts, and argues for its edits in the margin. You keep the final say.

In use at

WIDOW & ORPHANwght 300 · wdth 132
NORTHBOUND SUPPLYwght 820 · wdth 68
PICA POINTwght 500 · wdth 100
HALFTONE MEDIAwght 200 · wdth 151
RECTO VERSOwght 950 · wdth 100
LEDGER & FIELDwght 620 · wdth 84
02 / Axes

Voice isn’t a preset. It’s a set of positions.

The ampersand is where a typeface shows its hand. Same character, thirteen axes, and no two settings agree on what it should be. Kern treats writing the same way. You don’t pick a tone from a dropdown. You hold a position, and you hold it across every sentence.

wght100..1000
Force. How hard a sentence pushes. Heavy copy commits to something. Light copy hedges and hopes you didn’t notice.
wdth25..151
Room. How much space an idea takes. Condensed says it once. Extended says it once, then explains what it just said.
opsz8..144
Distance. Copy read at arm’s length isn’t copy read from across a room. Optical size tracks where the words land.
GRAD−200..150
Emphasis. Weight without reflow. Grade darkens a letter and leaves the line exactly where it was. It’s the only honest way to stress a word.
Waterfall size/leading · opsz tracks the size, as it should
96/84

Every word pays rent.

64/58

Every word pays rent. Most are behind.

40/38

Every word pays rent. Most are behind, and the ones that pay are carrying the rest.

26/30

Every word pays rent. Most are behind, and the ones that pay are carrying the rest. Kern reads the ledger and tells you which ones to evict.

17/26

Every word pays rent. Most are behind, and the ones that pay are carrying the rest. Kern reads the ledger and tells you which ones to evict, then shows you the arithmetic so you can argue with it. You sign off on every eviction. That’s the whole product.

03 / Voice

Same message. Five registers.

Drag the slider. The words change and so does the type, because they’re the same decision. Blunt copy is heavy and narrow. Formal copy is thin and wide. You can see the padding before you read it.

Sample / delay notice 'wght' 420 · 'wdth' 100 8 words · 43 chars

Neutral
Blunt Plain Neutral Polished Formal
04 / What it does

Four things, done properly.

Kern isn’t a chat box with a personality bolted on. It’s four specific jobs, done where you already write, and it will show you its reasoning for every one of them.

01

It shows its work.

Every cut comes with a reason in the margin, not a confidence score. Read the argument, then disagree with it. The word stays if you say it stays.

We wanted to touch baseNobody has ever been glad to have their base touched. Say the thing. about Q3.

02

It keeps your rules.

Load your style guide once. Kern won’t quietly bring back the words you struck, however well they’d fit the sentence.

  • very
  • just
  • utilize
  • in order to
  • touch base
  • at this time
03

It cuts before it adds.

Ask for shorter and you get shorter. Not shorter with a fresh introduction bolted on the front. The default move is subtraction.

28 words, example draft
same meaning
04

It reads the whole document.

Consistency across forty pages, not just the paragraph you highlighted. If page 2 says customers and page 31 says users, Kern flags the drift and asks you to pick one.

p.2 customers    p.31 users

05 / Playground

Type in the specimen.

This is the real font, the real axes, and your real words. Drag the sliders and the text below re-renders through font-variation-settings. Nothing here is a picture of a product.

Untitled draft 0 words
Weight380
Width100
Optical size44
Size44
Generated CSS

          
        
06 / The desk

The editor, mid‑argument.

Kern marks what it would cut and says why in the margin. You accept it, reject it, or ignore it entirely. Nothing changes until you say so.

launch-note.md 8 suggestions

We really just wanted to reach out and touch base in order to let you know that Quick note: our brand new field guide is now finally available for purchase at this point in timeout.

It’s very important to note that itIt covers basically everything we’ve learned over the course ofin nine years of setting type, and we think you’re going to absolutely love it.

Please don’t hesitate to reach out to us if you have any questions whatsoeverAsk if you’re stuck.

77 Words out, from 77
0 Meaning lost
"touch base"

Nobody has ever been glad to have their base touched. Say the thing.

"at this point in time"

Five words doing the work of one. “Now” was right there.

"brand new"

New is already new. Brand is doing nothing but taking up room.

"please don’t hesitate to"

Eight syllables to say “ask”. They cost you the whole sentence.

07 / Licence

Priced like a typeface, not a seat.

One writer, one price. No per-word billing, no credits to top up, no meter running while you think about a sentence.

Single
$18/ month
  • One writer, unlimited drafts
  • Margin notes with reasons
  • One style guide
  • Export to Markdown, Docs, HTML
Start writing
Most licensed Studio
$54/ month
  • Up to 8 writers
  • Shared style guides and struck-word lists
  • Document-wide consistency checks
  • Version history, 12 months
Start writing
Foundry
Custom
  • Nine or more writers, SSO and SCIM
  • Your house rules as a shared ruleset
  • Audit log and retention controls
  • 99.9% uptime SLA, named contact
Talk to us
08 / Say less

SAY LESS

Start writing Read the build guide

Kern is in open beta. Bring a draft you’re not happy with.