Ranking updated 1 September 2026Listings reviewed 30 August 20268 agencies reviewedHow we rank
Legal work runs on intake, documents and deadlines, which is why most automation projects at law firms start with client intake and matter management rather than anything client-facing. The agencies below have shipped work in this setting and understand that confidentiality requirements rule out some tooling entirely.
Every agency below appears in our full ai voice agencies ranking and states law firms among the sectors it works with. Listings are ordered by their position in that ranking.
Teams that treat a phone line as production infrastructure and want latency, evaluation and monitoring specified before launch rather than discovered afterwards.
Companies 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.
Intake-heavy businesses that want a receptionist or qualification agent running quickly on a rolling agreement, and are buying an outcome rather than an architecture.
Small clinics, brokerages and rental businesses that want a phone receptionist deployed and looked after, and can accept a supplier built around one named individual.
Buyers with their own technical lead who need SIP and VoIP engineering hours on a voice build, and are comfortable directing an hourly offshore team.
Ahmedabad, IN
Not published
From $1k
The full reviews
The table is the summary. Below, every agency gets the complete assessment: what it is genuinely good at, where it falls short, and the facts behind its position.
Best forTeams that treat a phone line as production infrastructure and want latency, evaluation and monitoring specified before launch rather than discovered afterwards.
Softcery is the reference point for what a serious voice engagement should disclose before anything is signed. Latency is published as a budget with each stage attributed, the telephony and speech vendors are named rather than hidden behind a platform, and the service is structured as advise, then build, then operate, which matches how phone systems actually fail. The gap is commercial rather than technical. No price appears anywhere on its own site, the three-part structure means the real number only emerges after scoping, and the independent record is 12 Clutch reviews, a thinner base than several less specialized firms on this page carry. A buyer who needs a figure approved before a scoping call will not find one here.
Pros
Publishes a component-level latency budget from its own production traffic, including a p95 figure and a stall rate
Names the full stack, from LiveKit, WebRTC and SIP to Deepgram, Cartesia and Grafana monitoring
Names five clients and runs two live demos a buyer can call rather than watch
Publishes reference on-premises hardware at $4,000 to $12,000 for buyers who cannot send audio off site
Cons
Publishes no price of its own, so the only planning figure is the $10,000 minimum Clutch displays
The advise, build and operate structure means total cost only becomes clear after scoping
Twelve Clutch reviews is a thin independent record next to the larger review bases elsewhere in this ranking
HQ
Tallinn, Estonia
Team
11-50
Pricing
$10,000+ minimum, $50-$99/hr (Clutch-displayed); own site sells advisory on an availability retainer, build work per statement of work, and operations on a retainer, with no figures published
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. Clutch shows 4.9 from 27 reviews, a $10,000 minimum and $25 to $49 per hour, with most engagements landing between $50,000 and $199,999. It is not an agent specialist and does not present itself as one: AI development is 35% of a mix that also covers custom software and cloud infrastructure, and no agent framework, evaluation harness or observability tooling appears in the record. Turnover comes up repeatedly in Clutch's aggregated feedback, a specific risk on a build where context has to survive across months. Ninth reflects solid delivery evidence attached to weak agent specialization.
Pros
$25 to $49 per hour, the lowest published hourly band in this ranking, shared with Simform and RTS Labs, against a $10,000 minimum
4.9 from 27 Clutch reviews, with most engagements recorded at $50,000 to $199,999
Nearshore delivery from Rosario, Argentina, in hours that overlap the US working day
Cons
AI development is 35% of the service mix per Clutch, and the firm positions as a general nearshore software partner rather than an agent specialist
Team turnover recurs in Clutch's aggregated feedback, a direct risk on a long agent project that depends on retained context
Names no agent framework, evaluation suite or observability tooling anywhere in its record
HQ
San Francisco, United States
Team
51-200
Pricing
$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 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.
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 engineering vocabulary is specific in ways that are hard to fake, including warm transfer over SIP REFER with context carried across, barge-in handling and evaluation suites run before a line goes live. Against that, a buyer committing real budget is being asked to accept a supplier with no named client, no identified person, no legal entity, no address, no published price and about four months of public partner history, whose homepage numbers sit inside an illustration. The site is also a single-page JavaScript application that renders one line of text without scripts, so none of the detail it is judged on is reachable by a crawler. It ranks here because the technical writing is real, and no higher because nothing else is verifiable.
Pros
Describes warm transfer over SIP REFER with context injection, barge-in and queue-aware routing, which is call-layer detail resellers rarely produce
Runs regression and evaluation suites before launch and versions prompt changes
Builds multi-tenant voice platforms with usage metering and billing, a service few firms here offer
Cons
Names no client, no case study and no team member, so none of the technical claims can be checked
Publishes no founding year, legal entity, address, privacy policy or terms page of its own
The dashboard figures on its homepage sit inside a decorative mockup alongside a fictional 555 phone number
Its public partner history dates only from May 2026, roughly four months of visible track record
HQ
Las Vegas, United States
Team
Not published
Pricing
No 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 forService businesses losing bookings to unanswered and after-hours calls that want named comparable clients and a fast path to a live line.
Solven suits a service business with a straightforward problem: calls are going unanswered and bookings are being lost. Named clients with outcomes attached are rarer in this category than they should be, and the habit of reviewing calls and feeding corrections back into the agent is what separates a deployment that improves over time from one that quietly degrades. What a technical buyer will not find is any account of how the call layer works. There is no latency figure, no telephony or SIP detail, no stated position on interruption handling and no infrastructure named beyond CRM connectors, and the agent layer rests entirely on one platform vendor. There is also no independent review record and no published price, so both the commercial terms and the service quality have to be established in conversation.
Pros
Publishes named client outcomes at Anytime Fitness Australia, Colourworks and Sonnabend Capital
Reviews every call and feeds corrections back into the agent, a standing evaluation loop rather than a launch check
States agents are handling real calls inside the first week
Cons
Publishes no latency, telephony or interruption-handling detail, and names no infrastructure beyond CRM connectors
The agent layer depends on a single platform vendor, with no evidence the work would be portable
No price, founding year or team size is published, and no independent review profile was located
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.
Sidetool is a well-reviewed automation and Bubble studio that added voice recently, and this ranking reflects that order. The independent record is genuinely good, 4.8 across 28 reviews is one of the larger verified bases in this category, and the multilingual transfer support recorded on its vendor's directory is more than several voice-only firms here document. But a buyer choosing on voice has almost nothing to evaluate: no case study involves a call, no telephony, latency or call evaluation detail is published anywhere, and the business is 40% mobile app development by Clutch's own breakdown. The pricing picture is contradictory too, with a flat monthly subscription on its own site against a $10,000 project minimum on Clutch, which are different commercial models rather than different numbers. It belongs in this directory; it does not belong near the top of a voice ranking.
Pros
Clutch shows 4.8 from 28 reviews, one of the larger verified review bases in this ranking
Retell AI's directory records warm and cold call transfer with English, Portuguese and Spanish support
States a six to ten week path from kickoff to deployment
Cons
Not one published case study involves a phone call
Clutch's own breakdown puts 40% of the business in mobile app development and 15% in AI
No telephony, latency or call evaluation detail is published anywhere
Its own site sells a flat monthly subscription while Clutch shows a $10,000 project minimum, two different commercial models
HQ
Doral, United States
Team
Not published
Pricing
Own 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 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.
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. For a buyer who needs to understand what they are running, the record is thin to the point of absence. Nothing technical is published, no latency or interruption behaviour is stated, no call testing method is described, and the compliance page that would carry a HIPAA or call-recording position returns a 404, which matters given the fertility and legal intake work it names. Its headquarters also disagrees between sources, with a Wyoming address of the kind registered-agent services use on its own site against New York on the vendor directory, and no founding year, team size or price is published anywhere.
Pros
Retell AI's directory records 250,000 or more calls a month, the largest monthly volume shown there for any partner here
Names four client organizations across legal intake, insurance, fertility concierge and payments
States a two to three week implementation on 30-day rolling agreements, a low-commitment entry
Cons
Publishes nothing technical: no latency, no telephony detail, no interruption handling and no call testing method
Its own how-it-works and compliance pages return 404, so no HIPAA or call-recording position can be checked
Headquarters disagrees between sources, and no founding year, team size or price is published
Delivery rests on one platform vendor, and the rest of the stack it names is generic
HQ
Not published
Team
Not published
Pricing
Custom pricing scoped per engagement, a stated two to three week implementation and 30-day rolling agreements; no figures published
Best forSmall clinics, brokerages and rental businesses that want a phone receptionist deployed and looked after, and can accept a supplier built around one named individual.
For a clinic or a small brokerage, Kingstone offers two things the larger firms on this page do not bother with: named comparable clients at the same scale, and a written agreement about what the agent will and will not do before it goes live. The exposure is concentration. One person is named on the entire site, so a buyer is taking on real key-person risk with no published team size, no founding year and no address to fall back on. The build also sits a layer above Vapi, with no SIP, latency or interruption-handling detail published, so how the call behaves under load is untestable from outside. A cost article on its site quotes $5,000 to $15,000 in setup plus around $219 a month for a Vapi receptionist, but that is presented as market guidance rather than its own rate, so its price remains unpublished.
Pros
Publishes named client deployments at the scale a small business would actually buy
Listed as a solutions partner on Vapi's own directory and names ElevenLabs as a commercial partner
Sets written operating boundaries before launch and states it retains responsibility for how systems run
Cons
Only one person is named on the entire site, with no team size, founding year or address published, which is real key-person risk
The work sits a layer above Vapi, with no SIP, latency or interruption-handling detail
Every named client is a small Croatian business, while the site frames operations across the United States and Croatia
No price is published, and no independent review profile was located
Best forBuyers with their own technical lead who need SIP and VoIP engineering hours on a voice build, and are comfortable directing an hourly offshore team.
On paper Samcom has telephony depth that several higher-ranked firms lack, and it is one of very few agencies in this category willing to publish what an hour of its time costs. Two things pull it down. Its own site advertises a Clutch score of 4.9 from 74 reviews, while the Clutch profile for this company, confirmed by domain and location and opened twice during research, displays zero client reviews. An unreviewed profile is an absence of data rather than a low score, but the advertised figure does not match the source it cites, and public accountability is one of the five criteria this ranking is decided on. The second is the shape of the engagement: hourly rates at commodity levels, a $1,000 floor, no client named anywhere and a menu running from SIP stacks to Shopify is staff augmentation rather than a delivered voice system. A buyer who already has an architect and needs VoIP hours may do well here; a buyer who wants a system owned by the supplier should look higher up this page.
Pros
Names carrier-grade SIP stacks including Asterisk, FreeSWITCH, Kamailio and OpenSIPS alongside LiveKit and Pipecat
Publishes its own hourly rate card, which almost no agency in this category does
Clutch shows a $1,000 minimum project size, the lowest published entry point in this ranking
Cons
Its site advertises a Clutch score of 4.9 from 74 reviews, while the Clutch profile for this company displays zero reviews
Names no client anywhere, so sub-500ms latency, 60,000 calls a day and 500 projects are unattached claims
Hourly billing at commodity rates with a $1,000 floor is a staff-augmentation model rather than a delivered voice system
Founding year disagrees across three sources and team size disagrees between its site and Clutch, so neither is recorded
HQ
Ahmedabad, India
Team
Not published
Pricing
Publishes hourly rates: VoIP developer $25-$55/hr, AI developer $35-$75/hr, VoIP support engineer $18-$38/hr; Clutch shows $25-$49/hr and a $1,000+ minimum project size
