GPT-trainer

GPT-trainer is a no-code platform for building AI agents that businesses deploy for customer support, sales, and internal operations. It supports both voice agents, built for low-latency phone conversations, and text agents that work across channels including email, SMS, web chat, and social platforms like Messenger, Instagram, and WhatsApp. The site states the platform is used by more than 1,000 companies. Agents can be connected to a business's own data by extracting content from PDFs, Word documents, Excel files, and web pages, and can be organized into a multi-agent setup where a supervisor agent routes conversations to specialized agents. Voice agents support batch calling campaigns, automatic follow-up workflows that retain conversation context, and handoff to a human representative when needed. Teams can review call transcripts and monitor activity in real time. The platform connects to CRMs and workflow tools such as Zapier, Make, and n8n, and integrates directly with Slack, Notion, WordPress, and Webflow, alongside webhook-based automation and a documented API for custom connections. It supports multiple underlying language models, including those from OpenAI, Anthropic, Google, and Mistral. A free tier is available without requiring a credit card, with further pricing detailed on a separate pricing page. One honest limitation: the site does not disclose its founding year or the company behind the product.