The 5 AI Tools That Run My Entire Business (Pay Per Usage)
Want the actual scripts — not just the architecture?
AI Avengers Lab members get the full working setup: pre-built code, campaign scripts, and weekly live builds. $89/mo.
See what's inside the LabFebruary 2025: our software bill was $1,100/month. GoHighLevel $497, various add-ons, API credits, a calendar tool, email platform. I sat down and asked: what is this actually doing that I couldn't replicate for $50?
13 months later: same capabilities, pay per usage, and I own my data. Here are the exact 5 tools.
Tool 1: Claude (The Brain) - ~$20/Month
Claude Pro at $20/month is the single tool that does the work of 3-4 specialized subscriptions. It writes content, analyzes data, writes and debugs code, handles customer communication drafts, runs Claude Code for automation, and serves as the intelligence layer for everything else in the stack.
Replaces: AI writing tools ($29-99/mo), code assistants ($19/mo), various AI subscriptions. Claude does it all. If I had to keep only one tool from this list, it's Claude.
Tool 2: Resend (Email) - Free
Resend is a developer-focused email API. Free up to 3,000 emails/day. We run our entire email operation - campaigns, transactional emails, drip sequences - through Resend. The deliverability is excellent. Setup required writing Node.js scripts to trigger sends, but once built, it's zero-cost email at any scale we need.
Replaces: Mailchimp ($50-350/mo for our list size), ConvertKit ($79/mo), the email module inside GHL ($150+/mo in our plan). Three thousand emails per day for free.
Tool 3: Twilio (SMS) - ~$15/Month
Twilio gives us direct SMS capability: phone number ($1/mo), inbound/outbound messaging ($0.0079/SMS), and the infrastructure for our AI voice agents. At our volume, we spend about $15/month. GHL was charging us $0.025-0.035/SMS through their Twilio reseller markup - we were paying 3-4x the direct rate.
Replaces: GHL's SMS module (massive markup), any SMS platform that acts as a Twilio middleman. Go direct. The setup is 1 hour and you never pay markup again.
Tool 4: Cal.com (Scheduling) - Free
Cal.com replaced Calendly ($16/mo). Free tier includes everything we need: unlimited event types, routing forms for lead qualification, Zoom integration, website embedding, and automated reminder emails. We use routing forms to pre-qualify every discovery call before a human joins.
Replaces: Calendly ($8-20/mo), Acuity ($16/mo), or the scheduling module inside any CRM. The free tier is genuinely complete.
Tool 5: Jarvis / DuckDB (CRM) - Free
Jarvis is our internal CRM built on DuckDB - a free, local analytical database. Our entire contact database (3,005 contacts), campaign tracking, pipeline management, and reporting runs from a single file on my machine. Query time for complex filters: under 100 milliseconds. Monthly cost: $0.
Replaces: GoHighLevel CRM ($497/mo of our plan), Salesforce, HubSpot, Pipedrive - all of it. This requires technical setup (or someone to set it up once). It's not for non-technical teams without a wrapper UI. But if you can handle it, the economics are compelling.
Who This Stack Works For
Technical enough to set up these tools (or hire someone for a one-time setup): this stack saves $800-1,100/month. Non-technical team that needs a GUI for everything: a simplified version (Claude + Resend + Cal.com) still saves $200-400/month and requires no code.
We teach the full sovereign stack setup inside AI Avengers Lab - including which tools to start with based on your technical level. The details are at aiavengers.team/lab.
Related reading from this series
This post is part of the Replace SaaS with Claude playbook. The full series covers every step with concrete workflows, pricing, and lessons from running my own business on Claude.
For more playbooks, visit the AI Avengers home page or join the AI Avengers Skool community to put these into practice with weekly office hours.
AI Avengers Lab
This guide gives you the architecture.
The Lab gives you the working code.
Stop reading about the sovereign stack. Start building it. Lab members get every script, every config file, and weekly live sessions where we ship new integrations together.
- Full working code: DuckDB CRM schema, Mailgun wrapper, Claude Code config
- Weekly live builds — we add new integrations together
- Private community of operators building sovereign AI stacks
- Direct access to Manoj — ask questions, get real answers
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Frequently Asked Questions
Do I need to be a developer to use this stack?
For the full stack (including Jarvis/DuckDB), you need basic technical skills or a developer for the initial setup. For the simplified version (Claude + Resend + Cal.com), you need comfort with following technical documentation and writing basic scripts - not full developer skills. Claude itself can help you set up Claude.
Is Resend reliable enough for business email?
Yes. Resend uses the same underlying infrastructure as major email platforms. Deliverability is excellent - often better than marketing email platforms because Resend's reputation is built on transactional email, which has higher deliverability standards. We've sent to 3,000+ contacts with open rates comparable to our GHL numbers.
What about compliance - GDPR, CAN-SPAM?
Compliance is your responsibility regardless of which platform you use. With this stack, you handle unsubscribe logic in your own scripts (we add an unsubscribe link to every email that updates a tag in DuckDB). GHL and other platforms handle this for you - that's a genuine tradeoff to consider. If compliance overhead feels too heavy, stay on a managed platform.
What's the biggest risk of moving to this stack?
Setup time and technical maintenance. GHL charges $1,100/month partly because it handles maintenance, updates, and support. With the sovereign stack, you own the maintenance. For a technical founder, this is fine - you fix issues yourself. For a non-technical operator, budget 2-4 hours/month for maintenance or hire someone to be on call.
Ready to build — not just read?
AI Avengers Lab: working code, live builds, community. $89/mo.
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Creator of AI Avengers Lab. Building sovereign AI stacks for business owners and professionals- no npm, no SaaS middleware, just Claude Code and direct API connections.