Ways to use Letterpress-1

Letterpress-1 is a different type of developer tool ecosystem, spanning from a re-imagined IDE that lives within your application and ready-to-go primitives for common growth infrastructure needs.

letter.dev
BIIbarra Real Nova ▾−84pt ▾+
Meet Letterpress-1 for F26.
Letterpress-1 is the world’s first coding agent, harness and IDE for growth engineering
Book demo$ npm i -g @letterstory/letterpress
Forward-thinking companies build on Letter
LetterEdit
1 changeone pull request
1. Meet Letterpress-1 for F26.
~~Meet Letterpress-1~~Set in Ibarra Real Nova at 84pt
Make Pull Request
A screenshot of this view goes with it
01
Text adjustments to immediate PRs.
Open the Letter Edit modal via ⌘L and double-click any text to adjust copy, sizing, and font.
⌘LDouble-click textPull request
The Letter Co… Letterpress-1MemoryMeasureProofsPrimitives
Build
Plan
Fix
Site
Resource map
Automations
Config
API keys74
Data
Letterbases8
Sequences9
Templates76
Connections1
Show primitives ›
Letterpress-1›letter.dev ⌄›Site
FiltersMetrics
Page accesses, AI · humans · ambiguous · last 28 days · LetterVisit
/◉ 2.4KAI 905Humans 1,402? 93
/blog◉ 1.2KAI 812Humans 340? 82
/pricing◉ 486AI 211Humans 259? 16
/showcase◉ 302AI 98Humans 190? 14
1,234 accesses, last 28 days (+12%)
AI agents: 812
ChatGPT: 402 · Claude: 231 · Perplexity: 107 · Gemini: 72
Humans: 340 (58 from AI answers) (21 identified)
02
One-shot agent and humans deep telemetry.
Letter’s pre-built telemetry will track human and agentic visitors on every page and show views on the sitemap. It’ll also de-anonymize agent and human traffic.
Every pageAI · humansWho they are
letter.dev
Meet Letterpress-1 for F26.
Letterpress-1 is the world’s first coding agent, harness and IDE for growth engineering
Book demo$ npm i -g @letterstory/letterpress
Forward-thinking companies build on Letter
LetterA/B test
A 50%B 50%+
~~Meet Letterpress-1~~
→ Meet Letterpress-1 for F26.
Save BStart test
B is ahead · +12s · 84% chance better
03
A/B testing via live editing.
Adjust text directly on your application and immediately get a pull request to A/B test that variation.
Edit the textVariant BPull request
The Letter Co… Letterpress-1MemoryMeasureProofsPrimitives
Provenance
Tier 3 · third-party confirmed
DNS-verified sign-ins and a Stripe-verified business. The highest tier.
Asserted
Observed
Bound
Confirmed
Companies observed214Last 30 days
BusinessVerifiedBy Stripe
Last signed12m agoRe-signed hourly
SessionsStripe businessLogosGrowthRetentionMake private
04
Validate data to agents via Proofs.
Install telemetry in your applications and billing, and receive a third-party verified proof of your success points for agents to review. Personalize what is and isn’t public.
ConnectSigned proofPublic or private
The Letter Co… Letterpress-1MemoryMeasureProofsPrimitives
Build
Plan
Fix
Site
Resource map
Automations
Config
API keys74
Data
Letterbases8
Sequences9
Templates76
Connections1
Show primitives ›
Letterpress-1›letter.dev ⌄›Automations
Automations · 6.5/wk + Add
Signal
A competitor publishes a page
2 acted · 9 skipped this week
Signal
Letter suggests something to build
/compare/segment opened by 40 visitors and 12 AI assistants in 28 days; nothing like it on the map
Topic
Storage for agents
3/wk
Series
Compare pages
2/wk
Topic
Search Console winners
1.5/wk
05
Automate SEO with a single button.
Automatically create landing pages and blog posts based on signals from Google, agent traffic, and competitor activity.
SignalsPages and postsPull requests
The Letter Co… Letterpress-1MemoryMeasureProofsPrimitives
Build
Plan
Fix
Site
Resource map
Automations
Config
API keys74
Data
Letterbases8
Sequences9
Templates76
Connections1
Show primitives ›
Letterpress-1›letter.dev ⌄›Site
FiltersMetrics
letter.dev
blog
kernels
ledes
mailers
phantomsDuplicate H1
proofs
seers
06
Visualize your sitemap in the IDE.
Instead of focusing on source code, visualize your website’s sitemap, identifying issues, traffic, and build opportunities across it.
Every pageIssues and trafficBuild
The Letter Co… Letterpress-1MemoryMeasureProofsPrimitives
Benches
VectorBench Live
OverviewRunsActivityReplicate
Spec drafted from the prompt
Reviewed and approved by a person
Domain found and bought
Repo on their GitHub
Letterpress-1 builds it and runs the benchmark
Site deployed, Visitors on it
Live, re-run on a schedule
07
Create self-governed benchmarks.
Create a benchmark app that’ll self-deploy, self-govern, and open-source its code without requiring any additional infrastructure.
Describe itIt deploysOpen source
The Letter Co… Letterpress-1MemoryMeasureProofsPrimitives
Phantoms · Your independent publications
SitesPerformanceVisitors
All about APIs EditorialLive
A periodical about APIs and the teams who ship them.
42 posts · 3/wk · 18 topics
PostsSettingsRefresh content
The Agent LedgerLive
A periodical about agentic capital tools.
27 posts · 2/wk · 11 topics
PostsSettingsRefresh content
08
Create independent blogs to test.
Create independent blogs to test growth strategies in a sandbox with automated blogs, design, and copy.
Launch a blogIt writesMeasure
The Letter Co… Letterpress-1MemoryMeasureProofsPrimitives
Letterbases · All letterbases + New collection
NameStateNextPublishedSchedule
BlogMain blog
Publishing
Next post in 2 days
48/52
2 a week
GuidesYour blog
Publishing
2 awaiting approval
17/21
1 a week
The Agent LedgerPhantom site
Publishing
Next post tomorrow
27/30
2 a week
Internal links6 posts due for an internal-link refresh
Newer posts have published since these were last linked. Refreshes automatically overnight.
09
Manage collections with a Letterbase.
A Letterbase is an optional, native database for storing content. It autonomously will refine content independent of pull requests.
Store contentIt refinesNo pull request
The Letter Co… Letterpress-1MemoryMeasureProofsPrimitives
Simulations
Acme API Live
v3 · 64 operations · keys last 24h
REST
app.letterstory.com/sim/acme
MCP
app.letterstory.com/sim/acme/mcp
For agents
app.letterstory.com/sim/acme/llms.txt
ReportSessionsRunsResources
Agent sessions1282,310 calls in 7 days
Reached a success81%64 made a successful write
Expected but missing4operations that don’t exist
Keys 142Called 128Succeeded 104Wrote 64
10
Build simulations for agents.
Create identical versions of your API or MCP with simulated data so that agents can try your application without cramming your database.
API or MCPSimulated dataAgents try it

Build on engineering tools designed for growth.

Install Letterpress-1 on your repository today.