Letterbook's tech stack
What does Letterbook use?
Letterbook (letterbook.ai) uses at least 23 tools we can see from public records, including Vercel for hosting, Google Workspace for email and documents, Zoho for sales and Zendesk for customer support. Last checked .
“AI-native customer support platform”
- Industry
- Operations
- Size
- 1–10 employees
- Based in
- San Francisco, United States
- Company page
- Tools found
- 23
- Categories
- 13
- Layers
- 5 of 5
- Last checked
- Oct 2026
Letterbook's stack, layer by layer
Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.
Edge & Hosting
4 tools, where the bytes are served from
Hosting & Cloud
CDN & Edge
Application
6 tools, what the product is built with
Frontend
Payments & Billing
Media & UI
Data & Observability
4 tools, what they measure and store
Go-to-market
7 tools, how they find and keep customers
Marketing
Sales & CRM
Support & Docs
Company Ops
2 tools, what the team runs on day to day
Email Delivery
Workspace
Companies like Letterbook also use
Tools common among companies with a similar stack that we haven't found at Letterbook.
Companies with a stack like Letterbook's
Ranked by shared tools, with rare tools counting more.
AutostepOperations · 1–10 people7in common
Arzana, Inc.Operations · 1–10 people7in common
Duckie, Inc.Engineering, Product and Design · 1–10 people8in common
VespperProductivity · 1–10 people6in common
InferSales · 1–10 people6in common
Artisan AI, Inc.B2B · 11–50 people12in common
Buildstash - Build-to-release management for software teamsDevelopment and Operations11in common
ZapierCloud Computing · 201–1,000 people12in common
More Operations companies
Other Operations companies we've checked.
Letterbook tech stack FAQ
What tools does Letterbook use?
We've found 23 tools at Letterbook (letterbook.ai). Edge & Hosting: Cloudflare, Vercel and Google Cloud. Application: YouTube, Anthropic and OpenAI. Data & Observability: Google Tag Manager, web-vitals and PostHog. Go-to-market: Zoho, Zendesk and Freshdesk. Company Ops: Google Workspace and Amazon SES. Last checked October 2, 2026.
What cloud does Letterbook run on?
Letterbook uses Vercel, Google Cloud and Microsoft Azure for hosting. We found Vercel through custom domain, DNS verification records, DNS records and website code.
What CRM does Letterbook use?
Letterbook uses Zoho and Warmly for sales and CRM. We found Zoho through subprocessor list.
What email provider does Letterbook use?
Letterbook uses Google Workspace for email and documents. We found Google Workspace through email records.
What does Letterbook use for customer support?
Letterbook uses Zendesk, Freshdesk and Intercom for customer support, among 4 tools in this category. We found Zendesk through subprocessor list.
What payment provider does Letterbook use?
Letterbook uses Stripe for payments. We found Stripe through subprocessor list.
Does Letterbook use Cloudflare?
Yes. We found Cloudflare at Letterbook through DNS records. Cloudflare is used by 147,753 companies we track.
How does runsonwhat know what Letterbook uses?
We read public traces only: Letterbook's DNS and email records, certificate logs, the code its website loads, and published subprocessor lists. A tool is listed only when a direct record backs it up. DNS is rechecked weekly and the website monthly.
We read public traces only: DNS and email records, certificate logs, website code and published subprocessor lists. A tool is listed when a direct record backs it up, and dropped when a recheck no longer finds it. Is this your company? See how to opt out.