Kong Reviews
Kong Reviews

Inbox Zero tech stack

Inbox Zero is an open-source AI assistant for your email. It runs on Next.js, Vercel, Prisma, PostgreSQL and 12 more, read from its public repo elie222/inbox-zero.

Sorts, labels and drafts replies to email in Gmail and Outlook, bulk unsubscribes and blocks cold email. Paid plans from $18 per user a month, each with a 7-day free trial.

AI · web, ios · https://www.getinboxzero.com · 12,833 GitHub stars, AGPL-3.0 (2026-10-27)

Built with

Frontend

  • Next.js (package.json: next)

Hosting

  • Vercel (package.json: @vercel/analytics)

Backend

  • Prisma (package.json: prisma)

Database

  • PostgreSQL (.env.example: DATABASE_URL)
  • Upstash (package.json: @upstash/qstash)
  • Redis (package.json: ioredis)

Sign-in

AI

Payments

Email

  • Resend (.env.example: RESEND_API_KEY)

Analytics

Monitoring

  • Sentry (package.json: @sentry/nextjs)

Other

  • Crisp (package.json: crisp-sdk-web)

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What do I use to build this?
And how much will it cost?What do you want to build?

Describe it in a sentence, like “an app that tracks the beans in my pantry”. You get what to build it with, what it runs on, and what it costs now and as it grows, with a source for every price.Describe it and press Plan. You get what to build it with, what it runs on, and what it costs now and as you grow, after the credits you qualify for.

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Prices read from each vendor’s own pricing page

  • Vercel
  • Supabase
  • Stripe
  • Clerk
  • Resend
  • Neon
  • Cloudflare
  • PostHog

317 services listed across 36 categories. 70 priced in full, plan by plan.

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Recordings of the actual app. Inputs are illustrative; Billing shows an example account.

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  • Claude
  • ChatGPT
  • Cursor
  • VS Code

I’m building a booking app for yoga studios with sign-in, payments and email reminders. What should it run on, and what will it cost at 20,000 users?

Example prompt. The answer is a live result from recommend_stack, the tool your assistant calls, at today’s prices.
No vendor pays to be listed or ranked higher, and there are no referral links.

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Import a CSV, upload a text-based PDF, paste an invoice or enter an amount. Recurring subscriptions add completed months automatically.

Supported OpenAI, Anthropic, Vercel, Stripe, AWS and DigitalOcean connections sync completed months nightly. Billing access depends on the provider; personal Claude API keys cannot read organization costs.

Forward receipts when they arrive

When receipt forwarding is enabled, send receipts to your private billing address and review the service, month and amount in Billing. It reads the email body, not attachments; upload PDFs separately.

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