Automating a business with AI is almost never one tool: it's an orchestrator that connects your apps, a language model that understands and writes, and a channel to talk to your customers through. These are the pieces we put together on real projects, grouped by what they're for.
Orchestrators: the glue
These are the ones that connect your apps and trigger actions. Make and Zapier are the two best known in no-code form, with a free plan and paid tiers based on volume of operations. If you'd rather host it yourself with no limit on executions, n8n is open source and installs on your own server. For most small businesses, one orchestrator covers a good part of what people call automation.
Language models: the brain
The AI part that understands text, summarises, classifies and writes. The Anthropic (Claude) and OpenAI APIs are the most used; you pay per use (tokens), so a well-designed flow costs cents per operation. You don't need to train a model to get started: good instructions plus your data as context is enough (see our article on RAG).
Messaging: the channel
Where your customers actually are. Meta's WhatsApp Business Platform lets you send and receive messages automatically and officially; it's billed per conversation. For voice and SMS, platforms like Twilio cover calls and reminders.
CRM and data
A CRM keeps track of where each customer stands so no opportunity gets lost. Tools like HubSpot (with a free plan) or lighter setups on Notion or Airtable are enough to start with. What matters isn't which one, but that it's connected to the rest: that a booking from the chatbot turns up on its own in the CRM and in your calendar.
Free or paid?
Almost all of them have a free plan to try. The real cost shows up with volume: number of operations, conversations or AI calls. The good news is that an efficient flow usually costs a lot less than the hour of work it replaces. The bad news: chaining ten free tools together badly costs more in maintenance than doing it properly from the start.
The tool matters less than the integration. Ten apps that don't talk to each other aren't automation; they're ten more places to check.
If you want to know which ones fit your case, tell us which process eats the most of your time and we'll tell you what we'd build and what it would cost, no waffle.