This compares published product information; it is not a matched hands-on comparison. We read each company’s pricing pages and documentation on 5 October 2026. The three starting points are what each company emphasizes, not limits on what each product can do. AgentsFast is in early access by invitation.
Side by side
| Lindy | Relevance AI | AgentsFast | |
|---|---|---|---|
| Where the work happens | LindyIn the tools you already use, through its integrations. Your team works with it in Slack, and an owner can also text it. | Relevance AIIn agents you build that connect to your tools through integrations, triggers and your own API connections. | AgentsFastIn its own CRM, knowledge base and automations, plus the channels and software you add. A connector workbench reaches outside tools. |
| Who sets it up | LindyIts quickstart: add it to your team’s Slack, then connect your email, calendar and phone. | Relevance AIYou build agents and teams of agents in its no-code builder, from templates, or with its Invent agent. | AgentsFastA manager agent configures the workspace and channels with you in chat. |
| Published examples of work | LindyUpdating your CRM, clearing your inbox, scheduling client calls, drafting emails and triaging a support queue. | Relevance AICustomer support with escalation, lead qualification, content drafts, reporting and scheduling. | AgentsFastAnswering the phone, working the inbox, chasing invoices, running your website and texting your customers. |
| Reviews and approvals | LindyPer integration, writes can run, wait for an approval prompt or be turned off. Its docs say those prompts apply in shared Slack threads; reads don’t prompt. | Relevance AIPer tool: run on its own or wait for a person’s approval, changeable at any time. Approvals can go to specific people. | AgentsFastOptional per-agent AI review of actions against who asked, the agent’s goals and its policies, with your explicit rules applied first. Separately, optional approved templates for customer emails. Coverage is set per agent and isn’t complete. |
| How usage is counted | LindyPer user, with credits pooled across the team. Its billing docs describe optional overages at a higher rate. | Relevance AIPer organization: Actions (each time an agent runs a tool) and Vendor Credits for model and tool costs. Your own API keys can replace Vendor Credits; Actions still count. | AgentsFastA team subscription plus monthly add-ons, with tiered allowances for voice, texting, images and video. |
What the differences mean
Your apps or a new workspace. If your customer records and schedule already live in tools you like, Lindy and Relevance AI are built to work across them. AgentsFast puts a CRM, knowledge base and automations in its base and adds channels and software as you choose. If you plan to keep your current tools, ask how it would read and write them.
Who builds and maintains it. Lindy’s quickstart adds it to Slack and connects your accounts. Relevance AI offers a no-code builder, templates and its Invent agent. AgentsFast’s manager agent configures things in chat. Whichever route you take, ask who changes the setup when your services, prices or staff change.
Customer conversations. If you want AI answering customers, ask each vendor which channels it supports and who provides the phone number. For example, Relevance AI documents outbound phone agents that can use a number it provides, and inbound texts and calls through a Twilio number you connect. AgentsFast sells phone lines and texting as add-ons.
Reviews and approvals. The three describe different designs: Lindy shows approval prompts for writes in shared Slack threads, Relevance AI lets you require a person’s approval per tool, and AgentsFast offers optional per-agent AI review with your explicit rules first. Our guide to AI employee authority explains AgentsFast’s checks: they are turned on agent by agent, add response time and model usage, and don’t cover every path. These are different designs, not a security ranking. Ask to see them on the channels you would use.
Usage. Lindy pools credits per user across the team, and its billing docs describe optional overages, so check the limit and overage settings you choose. Relevance AI counts Actions and Vendor Credits; its plan docs say your own API keys let you skip Vendor Credits, with that usage billed by whoever issued the keys, while Actions still count. AgentsFast prices each add-on monthly, with allowances. Because the units differ, price a real month of your own work on the Lindy, Relevance AI and AgentsFast pricing pages.
Questions to ask any of them
- Where would this work run: in my current apps, or in yours?
- Who sets it up, and who changes it when my business changes?
- Which customer channels does it answer, and who provides the phone number?
- What is reviewed or approved before it happens, on which channels, and what isn’t?
- What counts as usage, what happens at the limit, and are there overages?
- What can I take with me if I leave?
What this comparison can’t tell you
It compares published information. We haven’t run a matched hands-on comparison of these three products for this guide, and it doesn’t rate their security or rank them. Prices and features change; check each pricing page before you decide.
Sources
All pages read on 5 October 2026. Company pages describe what each company offers; they are not test results.
- Lindy pricing.
- Lindy docs: Understanding your usage.
- Lindy docs: Quickstart.
- Lindy docs: iMessage and SMS.
- Lindy docs: Integrations.
- Relevance AI docs: Introduction.
- Relevance AI docs: Approval mode.
- Relevance AI docs: Pricing.
- Relevance AI docs: Plans and credits.
- Relevance AI docs: Phone agents.
- Relevance AI docs: Twilio.
- AgentsFast home page.
- AgentsFast pricing.
- AgentsFast product page (DavidAgents).
- DavidAgents: Who gets to tell your AI what to do?.
Change log: October 2026, first version.