Top Companies Leveraging ElevenLabs, PlayHT, And OpenAI For Synthetic Voice Systems
Daria Pohrebniak
Marketing Director - Reverb
09.02.2025
This list compares the top companies building synthetic voice systems with ElevenLabs, PlayHT and OpenAI, for businesses that want a development partner to add realistic AI voices to their products, content or customer calls.
If you’re ready to take advantage of synthetic voice, you’re not alone. Teams are turning to it to provide quicker customer support, create more engaging content, improve accessibility features, and much more.
Behind the scenes, most advanced voice deployments rely on three best AI voice generation software solutions: ElevenLabs, PlayHT, and OpenAI.
Some companies already know these solutions inside out: they’ve built the processes, safety measures, and quality checks needed to smoothly integrate them into your workflows and make them work correctly.
In this article, we emphasize the top synthetic voice generation companies using ElevenLabs, PlayHT, or OpenAI for synthetic voice projects, so you can go from idea to live setup with less trial and error.
Synthetic Voice Companies At A Glance
Company
Location
Voice focus
1. Impekable
San Francisco and San Jose, US; Sydney, Australia
Certified ElevenLabs partner
2. Scale My Publication
Dover, US
PlayHT audio for digital publishers
3. DigitalSuits
Miami and New York, US; London, UK; Tallinn, Estonia
OpenAI text-to-speech API
4. Sparkout Tech
Coimbatore, India; Dover, US
ElevenLabs text-to-speech and audio workflows
5. EvinceDev
East Brunswick, US
OpenAI Whisper and GPT-4 voice solutions
6. Flowmondo
London, UK
ElevenLabs
7. Sunflower Lab
Columbus and Somerset, US; Gujarat, India
PlayHT and AI voice agent development
8. MMC Global
Austin, US; Dubai, UAE; London, UK
OpenAI voice tech, including Whisper
9. Tagline Infotech
Surat and Ahmedabad, India; Leander, US; London, UK; Dubai, UAE
PlayHT and ElevenLabs for AI agents
10. Fifty One Degrees
London, UK; New York, US
ElevenLabs for automated inbound and outbound calls
Impekable is one of the best synthetic voice generation companies in San Francisco. They’ve completed over 600 projects for different companies, including Google, Accenture, Adobe, and Nike, across multiple industries such as Retail, Insurance, Finance, Manufacturing, and more.
Impekable is a certified partner of ElevenLabs. This means they’re experts at using these tools to add realistic, multilingual speech to apps and workflows. The company takes care of all the complex work, like custom ElevenLabs’ API integration and connection with phone systems like Twilio or Amazon Connect, making sure responses are accurate and testing the setup after launch. You can expect a clear plan for your voice customer experience, quick prototypes, smooth integration ready for production, global deployment, and ongoing support.
Services and expertise: AI development, app modernization, product strategy, customer experience & product development
Location: San Francisco, San Jose, US; Sydney, Australia
Scale My Publication is here to support digital publishers like bloggers, online magazines, and newsrooms in growing their audience. They offer both on-demand services as well as a full-service news publication platform that’s customized to fit each client.
It’s one of the companies using PlayHT and can integrate it into your website so readers can listen to articles wherever they are. You can choose from ready-made voices or create your own branded voices for a truly unique sound. In addition, you can turn to Scale My Publication for social media content creation, link building, and more.
Services and expertise: Social media content creation, Google news submission, text-to-speech software integration, AI schema generator integration, website optimization with GTmetrix, optimized web hosting, custom news publication development
DigitalSuits has over eight years of experience in software development and, during this time, has delivered more than 100 projects. The company assists brands in leveraging the OpenAI text-to-speech API for high-quality voice synthesis. They customize and fine-tune Whisper for each specific use case, simplify workflows, and help control costs so you get reliable results without overspending.
DigitalSuits works with a wide range of industries, such as Real Estate, Healthcare, eCommerce, Media, Education, Event Management, Legal Services, HR, and Manufacturing. You can choose from several engagement options: consulting, dedicated teams, outstaffing, or the time-and-material model.
Services and expertise: Shopify development, eCommerce development, AI development, software development, IT consulting, IT outstaffing
Location: Miami, New York, US; London, UK; Tallinn, Estonia
Team size: 50+ specialists
Portfolio: ReturnGo, Crossing Minds, Eurora, and others
Sparkout Tech is a software and AI engineering company with over seven years of experience and more than 150 clients around the world. They focus on voice tech, particularly ElevenLabs, and create advanced audio workflows like text-to-speech, voice cloning, real-time AI voice generation, and voice changers.
Their AI agent development service takes you from the initial discovery and planning stages all the way through API integration, deployment, and ongoing support after launch. By making full use of ElevenLabs’ APIs, Sparkout fine-tunes aspects like pitch, speed, tone, and emotion to build unique brand voice profiles, support multiple languages, and keep latency and costs under control.
Services and expertise: ElevenLabs development, AI development, AI chatbot development, AI app development, enterprise AI voice solutions, AI consulting, custom software development, mobile app development, DevOps, QA and testing, spatial computing (AR/VR/MR)
Location: Ganapathy, Coimbatore, India; Dover, Kent, US
EvinceDev is a software and AI engineering partner that helps teams use OpenAI’s tools at scale. They have already completed over 1,200 projects in 28+ countries. Their voice solutions primarily work with OpenAI’s Whisper and GPT-4.
EvinceDev employs Whisper for quick, accurate transcription, multilingual speech processing, and voice commands, letting users search, navigate, and complete tasks through speech. They can easily integrate speech-to-text features into your existing apps, websites, CRMs, and enterprise systems. The company prioritizes security and compliance, following strict data privacy practices and safe-use guidelines to ensure deployments are both scalable and responsible.
Services and expertise: AI & IoT solutions, product development, mobile app development, UI/UX design, digital marketing, custom software development, full-stack development, eCommerce development, CMS development, IT consultation
Location: East Brunswick, US
Team size: 200+ team members
Portfolio: Sommos, Ministry of Interior, Alive Podcast Network, and others
Flowmondo is one of the top synthetic voice generation companies in London. It’s a no-code integration and automation studio with the mission of “making digital transformation as easy as ordering pizza.” They have 13+ years in AI automation and 2,100+ projects delivered. It’s one of the companies using ElevenLabs.
Flowmondo integrates ElevenLabs’ voice capabilities into your existing systems to create lively, personalized audio, like automated voice responses, real-time narration, and custom audio interactions, without needing heavy engineering. They start by understanding how your team actually works, then design custom workflows that go beyond the standard options and connect to nearly anything in your tech stack.
Services and expertise: Software integration, process automation, AI integration, data management, document automation, no-code development
Location: London, UK
Team size: Up to 49 experts
Portfolio: Cyprus Villa Retreats, Away We Go, BB7, and others
Sunflower Lab is a go-to team focused on AI-driven consulting and engineering. They can help you add an “AI teammate” to your organization in roughly four weeks, defining the role, estimating potential benefits, and quickly delivering a working agent.
Sunflower Lab uses PlayHT for voice projects but also has a versatile toolkit for a variety of needs: Vapi, BLAND.ai, Symbl.ai, Twilio, Replicate, n8n, Relevance AI, and much more. The company is trusted by over 200 clients from more than 30 industries, and for a good reason: they prioritize security with encryption, data masking, and strict governance.
Services and expertise: AI voice agent development, agentic AI automation, Data Brick consulting & Integration, Delta Lake development, product discovery, UI/UX design, web app development, mobile app development
Location: Columbus, Somerset, US; Gujarat, India
Team size: 150+ team members
Portfolio: Residential Real Estate Council, Ahoy!, Peerzle, and others
MMC Global is one of the AI and software consulting companies using OpenAI voice tech. Their work with OpenAI covers GPT-4, ChatGPT, DALL·E, and Whisper, providing quick API-based integrations.
Specifically for voice, MMC Global uses Whisper for accurate speech-to-text, which powers transcription, multi-language processing, and voice commands. They also provide testing ans validation services to make sure your AI-powered app is highly accurate and brings the results you expect.
Services and expertise: AI chatbot development, computer vision, predictive analytics, robotic process automation, web development, mobile app development, IoT development, blockchain development, IT consulting, software quality assurance
Tagline Infotech is a custom software provider with more than seven years of experience, having completed over 650 projects across 45+ countries. Their team develops personalized AI agents and voice experiences from start to finish.
When it comes to synthetic voices, they mostly rely on PlayHT and ElevenLabs. Tagline can integrate these tools into your existing systems, also connecting telephony services like Twilio and Amazon Connect, along with platforms like VAPI, SynthFlow, Retell, and Dialogflow. If you require hands-on support, their AI agent developers can help you design, implement, and refine the entire solution.
Services and expertise: AI agent development, app management and modernization, software product engineering, IT consulting, software outsourcing
Fifty One Degrees specializes in building practical conversational AI agents for real business needs. Their mission is to assist companies with improving customer service, supporting employees, and increasing productivity.
They mostly use ElevenLabs for voice work to automate incoming and outgoing calls and ensure the conversations sound natural and on-brand. Each project is customized for the client, built on a scalable voice AI architecture, and delivered quickly. A human-in-the-loop approach ensures quality, as experts review complex interactions, tweak flows, and help the system continue to learn.
Services and expertise: AI agent development, conversational AI development, AI consulting
Location: London, UK; New York, US
Team size: Up to 10 experts
Portfolio: Phoenix, Heatable, 4most, and others
ElevenLabs Vs PlayHT Vs OpenAI TTS: What Each Is Used For
ElevenLabs is known for natural, expressive voices, voice cloning and multilingual speech. Teams use it for narration, dubbing, branded voices and real-time voice agents that answer and place calls.
PlayHT offers a large library of ready-made voices plus custom voice creation. It is often used to turn written content into audio, such as listen-to-this-article players on publisher websites, and for voice agents.
OpenAI provides a text-to-speech API with a set of built-in voices, alongside Whisper for speech recognition and GPT models for language. Developers often choose it when they already build on OpenAI and want speech input, reasoning and speech output from one provider.
Many projects combine these tools, for example Whisper for transcription, a GPT model for the conversation and ElevenLabs or PlayHT for the spoken reply.
How To Choose A Synthetic Voice Development Partner
Platform experience: pick a partner that has shipped projects on the voice platform you plan to use, or that can explain which one fits your use case.
Use case fit: narration and audio content, phone agents and in-app assistants need different skills, so ask for examples close to your project.
Integration skills: check experience connecting voice to your telephony, CRM, contact center or website.
Voice rights and consent: if you plan to clone a voice, confirm how the partner handles consent and usage rights.
Ongoing costs: voice platforms charge by usage, so ask the partner to estimate usage based on your expected volume.
Which companies build on OpenAI’s text-to-speech API?
On this list, DigitalSuits helps brands use the OpenAI text-to-speech API for voice synthesis, EvinceDev builds voice solutions with OpenAI Whisper and GPT-4, and MMC Global delivers API-based integrations of OpenAI tools including Whisper. Each can build speech features into apps, websites and support tools.
Can Amazon Connect use ElevenLabs voices?
Amazon Connect uses Amazon Polly for its built-in voices, so ElevenLabs voices require a custom integration. Common approaches are routing calls to an ElevenLabs-powered voice agent or generating audio through the ElevenLabs API and playing it in the contact flow. A partner with experience in both platforms can set this up and test call quality.
What is the difference between ElevenLabs and PlayHT?
Both are synthetic voice platforms with voice libraries, custom voices and APIs. ElevenLabs is best known for very natural, expressive speech, voice cloning and real-time voice agents, while PlayHT is widely used for turning written content into audio and offers a large catalog of ready-made voices. The right choice depends on your use case, languages and budget, so test both with your own scripts.
Creating an AI-generated voice for businesses that integrates smoothly into your existing tools, stays compliant, and pays for itself over time can be challenging.
Technical implementation is only half of the story. A successful deployment must begin with clear business goals: which customer journeys you want to improve, what a good experience sounds like, how you’ll measure success (like fewer support tickets, quicker resolutions, higher satisfaction scores), and what safety measures you need to build trust.
That’s why choosing the right partner matters. Your potential team shouldn’t just connect APIs—they should design workflows, create policies, conduct quality checks, and monitor costs and latency. Use this list to find a partner who truly understands both the synthetic voice technology and your business needs.
If you want to feature your company leveraging ElevenLabs, PlayHT, and OpenAI for synthetic voice systems on this list, email us or submit a form in the Top Choices section. After a thorough assessment, we’ll decide whether it’s a valuable addition.
