These are the 8 agencies in the directory closest to Gearvox on category, industries, stack, team size and starting price, most similar first.
Gearvox ranks #2 in AI Voice Agencies. It quotes on request. Its best fit, in our words: Franchise networks and field service operators that need an agent wired into a dispatch system, and can work with pricing quoted per call rather than as a project fee.
Best forTechnical buyers able to judge a build proposal on its engineering merits, who are willing to take on a supplier with no public track record.
Also ranked in AI Voice Agencies; works with field service businesses; both build on Twilio, Retell AI, Salesforce and 5 more tools.
Read the service pages and Tempo Flows sounds like one of the more capable firms in this category; try to check anything and there is nothing to check.
The main cautionNames no client, no case study and no team member, so none of the technical claims can be checked
HQ
Las Vegas, United States
Team
Not published
Pricing
UndisclosedNo pricing published; states a delivery arc of architecture review, system design, build, hardening and evaluation, then launch and operate, at roughly six weeks to production
Best forContact centers and enterprises with an existing PBX or dialer that need an agent placed inside the estate they already run rather than a replacement for it.
Also ranked in AI Voice Agencies; both build on Twilio, Retell AI, Salesforce and 2 more tools.
For a buyer whose problem is a working contact center that now needs an AI agent inside it, Call Sandwich is the clearest fit on this page: it is the only firm here shipping a product whose job is to bridge an existing PBX to an agent.
The main cautionNames no client anywhere and anonymizes its testimonials, so 200 enterprise clients and 10 million calls rest on its own word
Azumo is a sensible nearshore partner for a US buyer whose AI work is mostly conventional engineering with a model in the middle of it, and who wants the lowest rate band available in this ranking.
The main cautionAI development is 35% of the service mix per Clutch, and the firm positions as a general nearshore software partner rather than an agent specialist
HQ
San Francisco, United States
Team
51-200
Pricing
From $10k$10,000+ minimum, $25-$49/hr (Clutch-displayed); Clutch review data shows engagements from roughly $4,200 to $70,000+. DesignRush separately shows a $50,000+ minimum and $55/hr
Best forCompanies already buying automation or internal tools from a well-reviewed studio, who want a voice agent added by a team that already knows their systems.
Also ranked in AI Voice Agencies; works with field service businesses; both build on OpenAI, Anthropic Claude and Retell AI.
Sidetool is a well-reviewed automation and Bubble studio that added voice recently, and this ranking reflects that order.
The main cautionNot one published case study involves a phone call
HQ
Doral, United States
Team
Not published
Pricing
$50-$99/hrOwn site sells a flat monthly subscription for unlimited queued automations with no figure published; Clutch shows a $10,000+ minimum project size and $50-$99/hr
Best forEnterprise teams that want an agent running in production with orchestration, tool access and tracing named up front, and a fixed-budget pilot before committing to a full build.
Also ranked in AI Voice Agencies; both build on Twilio, OpenAI, Salesforce and 1 more tool.
Master of Code Global is the right choice if you want an agent in production rather than a proof of concept, and you want to see how it will be debugged before you sign: it names LangFuse as its tracing layer alongside LangChain, LlamaIndex, MCP, Bedrock and Vertex, and it runs its own open source orchestration framework.
The main cautionChatbot and conversational AI account for 40% of technical focus per Clutch; autonomous multi-step agent work is a newer extension of a conversation design practice
HQ
Redwood City, United States
Team
Not published
Pricing
From $25k$25,000+ minimum project, $50-$99/hr (Clutch-displayed); sells a fixed-budget 30-day AI pilot with a four to five person team, price not published
Best forBuyers who want transfer and routing behaviour designed properly by a certified firm, and who do not need the supplier to own realtime infrastructure.
Also ranked in AI Voice Agencies; both build on Twilio, Retell AI, HubSpot and 2 more tools.
Iffort AI earns a conversation from any buyer who cares about what happens when a call has to leave the agent, because transfer and routing behaviour is where most voice deployments embarrass their owners, and it is the part this firm writes about in operating detail rather than in features.
The main cautionDelivery rests on a single platform vendor, with no owned realtime infrastructure
Best forIntake-heavy businesses that want a receptionist or qualification agent running quickly on a rolling agreement, and are buying an outcome rather than an architecture.
Also ranked in AI Voice Agencies; works with field service businesses; both build on OpenAI, Retell AI and Salesforce.
Agento AI is buying-an-outcome territory. The volume recorded on its platform vendor's directory is the largest shown there for any partner on this page, the named client organizations are checkable, and 30-day rolling agreements after a two to three week implementation is a low-commitment way to find out whether a voice agent works on an intake line.
The main cautionPublishes nothing technical: no latency, no telephony detail, no interruption handling and no call testing method
HQ
Not published
Team
Not published
Pricing
UndisclosedCustom pricing scoped per engagement, a stated two to three week implementation and 30-day rolling agreements; no figures published
We use Google Analytics to see which pages people read. It stores a cookie in your browser.
Nothing is stored unless you agree, and every page works either way.
What we collect.
