--- title: "Best alternative to Synthflow for voice AI" description: "Open Synthflow's pricing page today and you'll find one number. Enterprise contracts start at $30,000 annually, and the final figure is scoped around call volume, concurrency, and telephony setup." publishedAt: "2026-09-29" modifiedAt: "2026-10-11T06:34:00.000Z" notionPageId: "3eaa53d6-3d13-8035-86ac-f1c256bda6f5" languageCode: "en" canonical: "https://voicetta.com/blog-md/best-alternative-to-synthflow-for-voice-ai" --- # Best alternative to Synthflow for voice AI Published: 2026-09-29 Open Synthflow's pricing page today and you'll find one number. Enterprise contracts start at $30,000 annually, and the final figure is scoped around call volume, concurrency, and telephony setup. That's a notable shift for a platform known for no-code simplicity. Earlier this year, public pricing showed $0.09 per minute for voice plus $0.02 per minute for the language model. Anyone who budgeted around those rates is now having a different conversation. So what's the best alternative to Synthflow? It comes down to one question. Do you want to build a voice agent, or do you want one that's built and run for you? This guide compares five options on price, channels, quality control, and fit. Prices come from each vendor's public pages, and they change often. ## Synthflow alternatives at a glance Voicetta is a done-for-you system with shared memory across channels and per-call grading. Brilo AI offers small-team tiers with a free plan and published overage rates. Thoughtly focuses on speed-to-lead across voice and text, starting at $500 a month. Voiceflow is a builder for teams with conversation designers. Regal is a contact-center platform for outbound-heavy teams. The table below adds Synthflow as a reference row. Starting prices reflect public pages at the time of writing, and several vendors only quote after a demo. | Platform | Starting Price | Best For | Key Differentiator | Free Trial | | --- | --- | --- | --- | --- | | Voicetta | ~1.6¢/min inbound (BYOK); ~12.4¢/min (Managed AI) | Operators who want a working system, not a build project | Done-for-you setup, one brain across voice, SMS, and WhatsApp, per-call grading | Confirm current offer (a $50 credit ran through Aug 31, 2026) | | Brilo AI | Free plan; Pro from $149/month | Small teams that want predictable tiers | Published minute bundles and overage rates | Free plan with 10 minutes/month | | Thoughtly | Flex from $500/month | Teams converting web leads by phone and text | Calls new leads within seconds; unlimited usage across channels | None listed | | Voiceflow | Custom (usage-based for agencies) | Teams with conversation designers | Deterministic workflows with LLM-powered evaluations | Free trial for agencies | | Regal | Custom (demo required) | Outbound-heavy contact centers | Journey builder, dialer, and QA in one platform | None listed | | Synthflow (reference) | Enterprise from $30,000/year | Enterprises automating phone operations | No-code Flow Designer, own telephony, SOC 2 | None listed | ## 1. Voicetta: A done-for-you system, not another builder > **Full transparency:** Voicetta is our product, so we're not a neutral party here. We've tried to judge it by the same yardsticks as everything else on this list. Synthflow hands you a canvas. Voicetta hands you a working system. It designs, configures, and deploys the whole execution layer, and you operate the result instead of assembling it. Voicetta treats the language model as one component inside a controlled execution layer. Around it sit retries, latency management, failure handling, and call grading. The goal is recovered revenue and predictable inbound, not a clever demo. The approach comes from hospitality operations, where consistency matters more than sounding impressive. If you're weighing build versus buy, our comparison of [done-for-you versus DIY](https://voicetta.com/blog-md/done-for-you-ai-agent-vs-diy-which-path-secures-your-business-communication-in-2026) covers the trade-offs in detail. ### Standout features Voicetta covers inbound and outbound work. Inbound includes reservation capture, structured lead qualification, and automatic call logging. Outbound includes booking confirmations, pre-arrival reminders, follow-up calls, and post-stay messages. - **One brain, every channel.** Voice, SMS, and WhatsApp share a single agent. Conversation Memory pairs a recent-history window with a long-term Guest summary, so callers don't repeat themselves. - **AI Evaluations.** You write the quality criteria. Every call and text thread is graded pass, fail, or not applicable, with a one-sentence rationale. - **Optimize.** It reviews recent conversations, surfaces patterns, and proposes prompt and knowledge fixes. Nothing changes until you approve it. - **Bring your own number.** You route a number you already own, so callers never see a change. Grading every conversation replaces the random spot-check. We cover the wider approach in our guide to [monitoring AI phone agents](https://voicetta.com/blog-md/monitoring-ai-phone-agents-how-to-ensure-100-accuracy-and-performance-in-2026). Two limits are worth knowing. Grading is transcript-based, so it doesn't score tone of voice. And it starts the day you enable it, so it isn't retroactive. ### Where it shines and where it doesn't **Pros:** - Done-for-you setup covers agent design, conversation flows, CRM integration, knowledge base, and testing. - The engineering focus is latency, retries, and observability rather than build speed. - Every conversation is graded against criteria you wrote yourself. - Voice, SMS, and WhatsApp share memory instead of running as separate bots. **Cons:** - Done-for-you setup has no public price. You'll need a sales call for a quote. - Long-term Guest summaries need your own LLM API key, or they stop updating. - Memory isn't a CRM replacement. The agent should still confirm payments and bookings. - If you want to tinker on a visual canvas yourself, this isn't the right shape. ### Pricing breakdown Voicetta runs two models on one shared system. With BYOK, you bring your own AI provider keys and pay Voicetta only for communication infrastructure. With Managed AI, Voicetta runs the providers for you. BYOK infrastructure runs about 1.2¢ per minute for voice. Add roughly 0.4¢ per minute inbound or 0.7¢ outbound for US domestic telephony. That totals about 1.6¢ per minute inbound and 1.9¢ outbound, before provider costs. The base platform fee is $0 per minute for a client's first 1,000 Guests, locked in for those Guests. After that, 4.5¢ per minute applies to new Guests. That allowance counts people, not minutes, and it applies per workspace. Managed AI runs about 12.4¢ per minute for a Speechify Agent. A Standard Agent is 15.6¢, and a Realtime Agent is 40.6¢. SMS costs about 5¢ per message, and WhatsApp about 1¢. Every rate carries a "~" on the [public pricing page](https://voicetta.com/pricing), which covers the main rates only. A $50 free-credit offer ran through August 31, 2026, so ask whether a new trial is running. ### Real-world users Voicetta serves hospitality operators first, then real estate brokerages and property managers. Home services is a newer vertical. The founder built his first voice agent in 2019, inside his own hotel. He later rebuilt a national meal-delivery brand's voice assistant from scratch to answer in under 800 milliseconds. That system connected 45 tools to the client's CRM. ## 2. Brilo AI: Published tiers for small teams Brilo AI describes itself as an AI call center for sales and support. Its agents answer, qualify, resolve, and route calls around the clock. The pitch is plain: pick a plan, get a number, and start. Compared with Synthflow, Brilo is far friendlier to a small budget. You can see the price before you talk to anyone. ### Standout features - Around-the-clock answering, with several calls handled at once. - Handoffs to human agents when a call needs one. - Live call transcripts and interruption handling. - Integrations the company puts at more than 6,000 apps. ### Where it shines and where it doesn't Brilo shines on transparency. The Free plan lets you hear an agent on a real line before you spend anything. Overage rates are published, so you can forecast a busy month. It's less clear on the operations side. The pages we reviewed focus on calls. They don't describe shared memory across text channels or per-call grading, so ask about both in a demo. Minute bundles also cut both ways. They're predictable when volume is steady. They get expensive when a campaign or a holiday weekend spikes traffic. ### Pricing breakdown The Free plan gives you 10 minutes a month with one agent. Pro costs $149 a month for 600 minutes and three agents, with overage at 16¢ per minute. Growth costs $499 a month for 2,500 minutes and unlimited agents, with overage at 14¢. Custom plans start above 5,000 minutes. Paying annually saves 10%. A fully used Pro plan works out to about 25¢ per minute. A fully used Growth plan lands near 20¢. At 1,000 minutes, Pro would run roughly $213 including overage. ### Who's using it In the pages we reviewed, Brilo points to sectors rather than a named customer roster. Those include healthcare, financial services, real estate, hospitality, solar, and staffing. ## 3. Thoughtly: Speed-to-lead across voice and text Thoughtly positions itself around conversion. Its pitch is to call new leads within seconds, then text and email until they respond. It's built for go-to-market teams more than front desks. That makes it a different kind of alternative. You're buying a lead-response workflow, not a general canvas. ### Standout features - Calls placed within about 10 seconds of a form submission, per the company. - Voice, SMS, iMessage, WhatsApp, and email under one agent identity. - Two-way sync with major CRMs, plus 200+ integrations. - 34+ languages, with a choice of language models. ### Where it shines and where it doesn't Thoughtly shines when the problem is lead follow-up. A web form fires, the agent calls, and the CRM updates. That loop is tight. It shows its limits on the operations side. Automated QA and evaluations start at the Scale tier, not Flex. Flex also caps you at 10 concurrent calls, which matters during a busy campaign. And outbound has rules. The FCC ruled that calls using AI-generated voices count as artificial under the TCPA, so consent matters. Read the [FCC's AI voice ruling](https://www.fcc.gov/document/fcc-makes-ai-generated-voices-robocalls-illegal) before you launch campaigns. ### Pricing breakdown Flex starts at $500 a month. Thoughtly says all plans include unlimited usage across channels, with no per-channel fees. Scale and Enterprise are custom-quoted. Tiers also gate compliance and support. SOC 2 Type II is included at Enterprise, available on request at Scale, and not offered on Flex. HIPAA, PCI, and BAA coverage sit at Enterprise only. Support runs from email on Flex to Slack on Scale and a 24/7 hotline at Enterprise. ### Who's using it Thoughtly cites more than 1,000 revenue teams and a 4.6-star review rating. It serves mortgage lending, insurance, education, hardware retail, and business services. Named examples include Nomad, which the company says runs 20,000 calls a day. It also credits Centracom with $500,000 in cost savings. ## 4. Voiceflow: The builder for teams with conversation designers Voiceflow is an enterprise conversational platform for chat and voice agents. It's the closest option here to Synthflow's build-it-yourself model, with more emphasis on design discipline. Its agent builder blends agentic playbooks with deterministic workflows. Global instructions and guardrails manage both. If you like the canvas but want more structure, this is the one to test. ### Standout features - One agent deployed across web, app, WhatsApp, SMS, and voice. - LLM-powered evaluations that give custom insight at scale. - Environments that support a development-to-production pipeline. - Support for several model providers. ### Where it shines and where it doesn't Voiceflow shines when a team wants control. Deterministic paths keep an agent on script where the stakes are high. Designers and product managers can work in the same tool. But it's still a build. Someone has to own the flows, the knowledge base, and the integrations after launch. A small operator without that person will feel the gap quickly. The headline stats also count messages, not phone calls. Ask for voice-specific numbers before you assume the chat results carry over. ### Pricing breakdown Voiceflow's pricing page doesn't publish dollar figures. Businesses get custom pricing after a demo. Agencies and partners get usage-based billing and a free trial with no credit card. ### Who's using it Voiceflow lists more than 3,000 customers, including StubHub, Turo, and Trilogy. It reports 99.95% agent uptime and over a billion agent messages processed. Trilogy reports a 70% AI resolution rate. Turo reports 82% bot satisfaction. ## 5. Regal: Contact-center depth for outbound-heavy teams Regal calls itself built by contact center operators. It combines voice, SMS, and chat agents with a journey builder and a sales dialer. It's an enterprise play, closer to a contact-center system than a receptionist. ### Standout features - A no-code AI Agent Builder plus a Journey Builder for orchestration. - A unified customer profile that feeds each conversation. - A/B testing and conversation intelligence with QA monitoring. - Sales dialer and IVR capabilities on the same platform. ### Where it shines and where it doesn't Regal shines where volume and campaign logic matter. Insurance, lending, and healthcare teams get journeys, dialing, and QA in one place. It's a less natural fit for a single-location business. A boutique operator doesn't need a dialer, and the platform doesn't publish pricing. Regal cites 97% containment, an 80% lower cost to serve, and 4x faster speed-to-lead. Those are vendor claims. Ask for references in your own vertical. ### Pricing breakdown Regal doesn't publish pricing. You request a demo and receive a quote. Expect a custom enterprise contract. ### Who's using it Regal names eHealth, TaskUS, and the American Red Cross. Its industries include insurance, lending, banking, healthcare, education, and legal services. ## Frequently asked questions **Is Synthflow still self-serve?** Its public pricing page currently shows only enterprise contracts from $30,000 annually. Earlier public pricing offered pay-as-you-go rates. Confirm current terms with Synthflow before you plan around either. **What's the difference between a no-code builder and a done-for-you system?** A builder gives you tools. You design the flows, test the edge cases, and monitor the calls. A done-for-you system delivers the finished agent, and someone else keeps the execution layer running. Neither is better in the abstract. They suit different teams. The deciding factor is whether you have a person who'll own the build. **How much does voice AI cost per minute?** It varies widely because vendors bundle differently. Voicetta's BYOK infrastructure runs about 1.6¢ per minute inbound, before AI provider costs. Brilo's overage runs 14¢ to 16¢, and Synthflow's earlier pay-as-you-go rates added up to 11¢. Compare the whole stack, not the headline number. Voice, language model, speech, and telephony all show up on the bill. **What should I check on security?** Ask for a current [SOC 2 report](https://www.aicpa-cima.com/resources/landing/system-and-organization-controls-soc-suite-of-services). These reports examine a provider's controls for security, availability, processing integrity, confidentiality, or privacy. Ask which report type you're getting and what period it covers. **Can I keep my current phone number?** With Voicetta, yes. It routes a number you already own instead of porting it. The number stays billed on your own carrier account, and removing it in Voicetta only removes the routing. **Which option fits a hotel, property manager, or brokerage?** Voicetta, because setup, after-hours capture, and property-system workflows are built around those businesses. The others are general platforms. They can work, but you'd design the operational layer yourself. **What should I test before I sign?** Call the agent yourself, and don't follow the script. Change your mind mid-sentence. Ask a side question, then go back to the booking. Real callers hesitate, correct themselves, and drift off topic. A good system handles that and still finishes the job. Ask to see how failures are logged and who gets alerted. **Is the lowest per-minute price always the cheapest?** No. A low rate can hide separate charges for speech, the language model, and telephony. A bundled rate can hide overage or concurrency limits. Add up a realistic month of minutes, texts, and setup time. Then add the hours your own team will spend maintaining the agent. That last line is the one buyers forget. **Can I mix approaches?** Yes. Some teams pilot a builder for a narrow use case. They keep a done-for-you system on the phone lines that carry revenue. Just keep one owner for call quality. ## The bottom line: build it or have it built If you want a working system and a measurable standard, choose Voicetta. It suits hotels, property managers, and brokerages that care about recovered revenue more than build speed. You write the quality bar, and every conversation gets graded against it. If you're a small team that wants published tiers, Brilo AI is the easiest place to start. The Free plan lets you test on a real line. Watch overage if your volume swings. If lead response is the whole job, look at Thoughtly. It's built around calling and texting new leads fast. Check which tier includes the QA and compliance features you need. If you have conversation designers, Voiceflow gives you control and structure. If you run an outbound-heavy contact center, Regal offers dialing, journeys, and QA together. Both need real internal ownership. Synthflow still fits enterprises that want a no-code canvas and can commit to an annual contract. For everyone else, the question is who owns the build. If you'd rather have it built and running, book a live demo with the Voicetta team. Hear it handle a real reservation call.