At Sidetool, we build custom AI automations that handle your tasks, hassle-free. Let us automate the worst parts of running your company. As an official Retell Partner, we ship production-ready voice AI agents that answer phone calls, WhatsApp chats, and can cold or warm transfer conversations to a human when it counts. Receive fast, custom-built AI automations—usually delivered in just weeks, with custom maintenance. Whether you need voice AI agents, chatbots, customer support, sales automation, workflows, or data analysis, Sidetool slots straight into your tech stack and starts creating value from day one. Ready to turn every interaction into an opportunity? Let’s talk.

SmartVerse Group is a Europe-based Retell AI Certified Partner that designs, builds, and operates production-ready voice agents and AI automations. We create custom, fully-personalized solutions for each client – from call flows and brand voice to deep integrations with your CRM, ERP, telephony, and payments – so your Retell agents don’t just sound right, they run end-to-end in your real workflows and drive measurable revenue and support outcomes.

Call Sandwich is a certified Elite Retell AI partner — the highest tier in Retell's partner program. We specialize in building enterprise-grade voice AI integrations for complex telephony environments that standard agencies won't touch. Our team connects Retell to legacy and modern stacks alike — ViciDial, Asterisk, FreeSWITCH, NICE inContact, Avaya, Talkdesk, Genesys, and more — handling everything from SIP trunk configuration to full white-label AI platform development. Whether you need outbound AI sales agents, enterprise inbound routing, AI + human handoff, or a fully white-labeled Retell platform, Call Sandwich delivers production-ready, multi-tenant deployments built to scale.

Black Umbrella AI builds and deploys AI voice agents for businesses that are tired of leaky pipelines, missed follow-ups, and no-shows killing their ROI. We specialize in end-to-end Retell agent setup for companies that want production-grade calling infrastructure without the DIY learning curve. What makes us different: we come from the marketing side of the table, not just the engineering side. Our founder has 10+ years in direct response and has managed over $50M in ad spend across 30+ verticals, so we don't just build agents that talk, we build agents that convert. Every Retell deployment we ship is engineered around pipeline velocity: more conversations, better qualification, faster booked calls. Our agent setup service includes voice and prompt engineering, objection handling frameworks pulled from real sales floors, full integration with GoHighLevel, n8n, and your existing CRM stack, plus post-launch testing and optimization. We offer both done-for-you builds and white-glove training for teams that want to run agents in-house.

HeyPoppi is an AI voice platform specializing in business automation. Our natural-sounding AI receptionists answer calls, qualify leads, and schedule appointments, helping business owners save time and capture more opportunities. Based in Greenville, South Carolina, HeyPoppi serves industries many industries across the board. By partnering with Retell AI, we deliver reliable, human-like voice experiences at scale for local businesses.

La Crown Inc. is an AI automation agency founded by a 26-year freight brokerage veteran who got tired of watching businesses drown in repetitive tasks. We specialize in building voice AI systems powered by Retell AI — intelligent agents that handle carrier calls, customer follow-ups, compliance checks, and lead outreach around the clock. We don't just deploy AI; we engineer it around the real workflows of freight brokers, logistics operators, and business owners so it actually works on day one.

Legacy AI is a custom development Voice AI agency specialising in building chat and voice AI agents. As a team of 8 talented AI Engineers, we've partnered with 52+ businesses across solar, restaurants, travel, hospitality, insurance, real estate/property management and other service industries, helping them eliminate operational bottlenecks, eliminate missed clients from missed calls, and recover lost revenue. Our clients include some of the fastest-growing brands in their categories, including a $250 Million Restaurant Franchise over 200 Locations in North America, to one of the world's largest travel agency. We truly believe in our ability to be your AI and Software Development Partner.

Agency - using technology to drive revops