Running a GoHighLevel (GHL) agency means juggling dozens of tasks. It includes managing lead follow-ups, handling inbound calls, replying to messages, booking appointments, and many others. Most agencies either burn out their team trying to keep up or miss opportunities because no one was available to respond in time.

AI assistants are becoming a practical solution to this challenge. These tools can answer calls, reply to chats, book appointments, and trigger workflows without human intervention. The right platform can save time, streamline communication, and help agencies scale more effectively.

Two platforms that stand out for GoHighLevel users are Assistable.ai and Stammer.ai. In this article, we compare these platforms based on how they integrate with GHL, what features they offer, how easy they are to use, and how well they support agency growth.

Platform Purpose and Focus

Stammer AI

Stammer AI gives agencies a fully white-labeled platform to build and manage AI chat agents under their own brand. It focuses on customizable knowledge-rich agents that can respond based on documents, websites, and other internal content. This makes it a strong choice for agencies that need more than simple FAQ bots.

Stammer started as a chat-first platform but has recently expanded into voice. It now supports voice input and output in its web chat widget that allows users to speak to the agent and hear responses.

In addition, it introduced AI phone agents that can handle real-time inbound and outbound calls through virtual phone numbers. Although this feature is still marked as “Coming Soon” in the dashboard, it will soon allow agencies to offer both chat and phone-based automation

Assistable.ai

Assistable.ai focuses on helping agencies automate voice and chat communication quickly within the GoHighLevel (GHL) environment. It offers AI agents that answer calls, send SMS messages, and update CRM records.

The platform prioritizes speed and ease of use. Agencies can set up AI agents using tags and workflow triggers, with no coding required. This makes it ideal for teams that want to deploy call automation, missed call handling, or lead responses in minutes.

GHL Workflow Integration

Stammer AI

Stammer AI integrates directly with GoHighLevel through its native GHL app, making it easy to connect AI agents to your existing workflows. Once installed from the GHL marketplace, the app allows you to use a dedicated workflow action called “Send Message to AI Agent.” This action triggers a response from the selected AI agent using its unique UUID, which you can copy from the Stammer dashboard.

What makes this integration flexible is its ability to inject dynamic data into the agent’s system prompt. You can pull in contact-specific information such as names, locations, or tags using GHL custom fields.

This helps tailor the agent’s response based on the context of the lead or customer, all within a structured automation. Agencies can build smarter and more personalized conversations without writing custom code.

Communication Modes: Voice, Chat & Widget

Web Chat Agents

Stammer AI provides a fully customizable web chat widget designed to deliver a smooth and branded user experience. Agencies can adjust the widget’s appearance including colors, fonts, and layout to match each client’s website.

The widget supports popup prompts (initial messages that appear after a delay) to increase engagement and can display the data source behind each response, adding a layer of trust and transparency. The chat agent can respond to detailed queries using its trained knowledge base making it suitable for support and lead qualification.

Assistable.ai, on the other hand, doesn't currently focus on public-facing web chat widgets. Instead, it routes most conversations through SMS, internal GHL chat, or embedded message forms within client funnels. While this fits naturally within the GHL environment, it offers limited visual customization or standalone web widget options compared to Stammer AI.

Widget Voice Input/Output

Stammer AI enhances its chat widget with built-in voice input and output, allowing users to speak to the agent and hear spoken responses in return. This feature is free for all agency and sub-account users, and it helps create a more natural hands-free experience. Agencies can enable or disable this feature directly from the agent settings, and upcoming updates promise more advanced voice models through integrations like Whisper and ElevenLabs.

Assistable.ai does not currently offer voice-enabled chat widgets. While it handles voice through phone calls and SMS workflows, its absence of real-time voice interaction inside a web widget leaves a gap for agencies looking to provide conversational voice UX directly on websites.

AI Training and Knowledge Sources

Stammer AI

Stammer AI stands out when it comes to training AI agents on detailed structured knowledge. It supports a wide range of content sources, including PDFs, DOCX files, Google Docs, Notion pages, and even public or private URLs. This allows agencies to build agents that can handle complex multi-layered questions by referencing in-depth documentation, service pages, or internal knowledge bases.

The platform lets you train each agent on its own unique knowledge set, ensuring the responses are relevant and well-informed. For agencies managing clients with technical services, product catalogs, or large support libraries, this level of training flexibility makes Stammer AI a strong fit.

Assistable.ai

Assistable.ai takes a simpler approach to AI training. It uses FAQ-style inputs that guide the assistant’s responses based on predefined questions and answers. This format works well for straightforward tasks like appointment booking, lead qualification, or responding to common queries.

Instead of ingesting documents or long-form content, Assistable.ai focuses on building flow-based responses that align with voice or SMS interactions. It is ideal for where shorter and action-oriented answers are more effective. For agencies prioritizing fast, reliable communication over deep Q&A, this lightweight training method keeps setup quick and manageable.

Deployment Speed and Usability

Stammer AI gives agencies a high degree of flexibility, but that also means a few extra steps during setup. Users upload documents, configure prompts, and connect data sources, which allows for flexible agent behavior but involves a learning curve.

In contrast, Assistable.ai focuses on speed and simplicity. Agencies can deploy AI assistants instantly within GoHighLevel using a no-code tag-based setup. This allows voice and chat automation to go live with minimal configuration.

While Stammer suits agencies seeking deeper control, Assistable is ideal for teams that prioritize quick deployment and immediate results within a familiar GHL workflow. Each platform balances setup time with the level of customization offered.

Customization & Branding

Stammer AI offers full white-label control, making it ideal for agencies that want to resell AI services under their own brand. You can customize portals, dashboards, and domains, manage client sub-accounts, and even set your own pricing margins. This level of customization turns the platform into a complete SaaS solution.

Assistable.ai also supports white-label branding and includes a rebilling feature for voice minutes, allowing agencies to manage client usage and pass on costs. However, its customization options focus more on functionality within the GHL environment rather than full SaaS transformation. It’s suited for branded delivery, but with less structural flexibility than Stammer.

API, Actions & Extensibility

Stammer AI offers advanced extensibility for agencies that need more than basic automation. You can set up custom actions, trigger external APIs, and pass dynamic parameters to adjust system prompts in real time. This makes it possible to build highly tailored workflows that adapt to user input or CRM data on the fly.

Assistable.ai supports webhooks for external integrations but primarily routes logic through GoHighLevel's built-in automation tools. While it handles most standard tasks well, it’s better suited for agencies that prefer to keep workflows centralized within GHL rather than build out deeply customized external logic.

Strengths & Trade-Offs

Both platforms offer powerful tools for GHL agencies, but they have distinct differences. Stammer AI leads in web chat and knowledge-based automation that offers deep content training and full control over widget design and behavior. It also provides free voice input/output in chat widgets and full white-label SaaS capabilities. However, its voice calling feature is newer and can come at a higher cost

Assistable.ai, on the other hand, excels in voice automation. Its call handling is more mature, more affordable at scale, and deeply embedded in GHL. While its customization is more limited, it supports rebilling and delivers a quick no-code setup.

Final Verdict: Who Should Choose What?

Both platforms serve different agency needs, so the right choice depends on your priorities.

Choose Stammer AI if you’re building a white-label AI solution you can resell as a SaaS. It’s ideal for agencies that need advanced knowledge handling, customizable chat widgets, and voice-enabled web experiences. You’ll get full branding control, deeper training options, and flexible API integrations.

Choose Assistable.ai if you want a focused voice-first tool that integrates tightly into existing GHL workflows. It's a practical choice for agencies that need quick call automation, missed call handling, and straightforward SMS responses.

In the end, both platforms can elevate your agency’s automation efforts. If you’re thinking long-term and value ownership, customization, and multi-modal support, Stammer AI provides a broader foundation to build on.