Kong Reviews
Kong Reviews

CRM: what to build it with and what it costs

A team keeps its contacts, companies and deals in one place, with a pipeline and a log of every call and email.

Sample PRD

  • Contacts and companies
  • Deals pipeline
  • Activity log
  • Email sync
  • Team roles

What it needs

  • Organisations / B2B teams: each customer company is its own workspace with roles
  • Google sign-in: teams sign in with Google Workspace
  • Postgres: relational data: contacts, companies and deals link to each other
  • Transactional email: invites and notifications
  • Error tracking (nice to have): know when sync breaks

MVP: about 100 users, $0/mo

Someone with an idea or a solo founder. Built with an AI app builder: describe it and it builds and hosts it.

WhatPickMonthly
AI coding agentBase44 Starter$16
EmailMailgun Free$0
PaymentsStripe Standard (US cards)$0
Analytics & errorsSentry Developer$0

Open the full MVP plan · Use the MVP stage in Claude

Growth: about 10,000 users, $10.94/mo

A funded team or one with traction. Built with an AI coding agent for each of about 3 developers.

  • Daily backups: daily backups once real people depend on it
WhatPickMonthly
AI coding agentAugment Code Standard$20
HostingFly.io Machine, shared-cpu-1x with 256MB RAM$6.19
DatabaseNeon Launch$1.75
Sign-inAuth0 Free$0
EmailAmazon SES A la carte$3
PaymentsStripe Standard (US cards)$0
Analytics & errorsPostHog Free$0

First cost jump: Auth0: listed plans end around here, so expect enterprise pricing (contact sales); costs from here are a lower bound on Free

Open the full Growth plan · Use the Growth stage in Claude

Scale: about 100,000 users, $135.94/mo

An established product. Built with an AI coding agent with team billing and admin for about 10 developers.

  • Daily backups: daily backups
  • Point-in-time recovery: restore to any minute after a bad deploy
  • Multi-factor authentication: two-factor sign-in for accounts worth stealing
  • SOC 2 report available: customers' security reviews ask for a SOC 2 report
WhatPickMonthly
AI coding agentAugment Code Standard$20
HostingFly.io Machine, shared-cpu-1x with 256MB RAM$42.19
DatabaseDigitalOcean Managed PostgreSQL Single node (1 vCPU, 2 GiB RAM, 30 GiB disk)$34.75
Sign-inWorkOS AuthKit$0
EmailAmazon SES A la carte$30
PaymentsStripe Standard (US cards)$0
Analytics & errorsSentry Team$29

First cost jump: DigitalOcean Managed PostgreSQL: Single node (1 vCPU, 2 GiB RAM, 30 GiB disk) limits reached, upgrade to Single node (2 vCPU, 4 GiB RAM, 60 GiB disk)

Open the full Scale plan · Use the Scale stage in Claude

What drives the cost

  • Sign-in priced per active user, and SSO on enterprise tiers
  • Database size as activity logs grow
  • Email sync volume

Lock-in

Your schema and the sign-in provider's organisation model are the sticky parts; export both regularly.

Use this in Claude (with Kong Reviews connected at https://kongreviews.com/mcp)

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

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

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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?

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