En bref / Points clés
- Synthflow is now sold only as an annual enterprise agreement, with no free plan, no trial and no per-minute rate.
- Retell AI ($0.07 to $0.31 a minute, $10 credits) and ElevenLabs Agents (free plan, then from $6 a month) are the closest self-serve builders.
- Agencies that resold Synthflow can use Trillet's white-label plans, from $99 a month plus $0.12 a minute.
- If you only need calls answered, Rosie, Upfirst or My AI Front Desk replace the build entirely.
- Enterprises should compare Synthflow with PolyAI and Parloa, which also price by quote.
Short answer: Synthflow no longer sells a self-serve plan. Its pricing page says it is "sold as an annual enterprise agreement" with "no free plan or trial and no rate by the minute." If you wanted a no-code voice agent you could start on today, the closest replacements are Retell AI ($0.07 to $0.31 a minute, $10 of free credits) and ElevenLabs Agents (a free plan, then plans from $6 a month with minutes included). Agencies that resold Synthflow under their own brand should look at Trillet, whose white-label plans start at $99 a month with a 7-day trial. If you only need your phone answered, a done-for-you receptionist like Rosie (from $49 a month) or Upfirst (14 days free) skips the build. Updated November 9, 2026.
How we checked: every price, plan and limit below comes from the vendor's own pricing page or documentation, read November 9, 2026. We did not test call quality or latency, and we say nothing about either. Where a vendor's own pages disagree, we use the pricing page and say so. For a developer-first comparison, see our Vapi alternatives guide; for per-minute cost at 1,000 and 10,000 minutes a month, see our AI voice agent platforms comparison.
What changed at Synthflow
Synthflow is often listed as a no-code builder that small teams and agencies can sign up for and pay by usage. Its pricing page now reads differently. Every new deployment "starts on an Enterprise contract", scoped to your call volume, phone system, integrations, security review and launch support, and the page answers "Is Synthflow free to use?" with a plain "No."
- No trial and no per-minute rate: you get a price only after a scoping call with sales.
- Built for mid-market and enterprise: the page says so directly, and launch is handled by Synthflow's forward-deployed engineers where the contract includes it.
- White-label is still available, but inside the annual agreement: BPOs and software platforms can run Synthflow under their own brand, which rules out a small agency testing the water.
- Compliance is a strength: its Trust Center lists SOC 2 Type 2, ISO/IEC 27001, GDPR, HIPAA (self-attested) and PCI DSS v4.0.1, per the pricing page.
So the question is not whether Synthflow is good. It is whether you are the buyer it now sells to. If you are an enterprise with a procurement process, it may still fit. If you are a small team, a solo builder or an agency, you need one of the options below.
Synthflow alternatives at a glance
| Tool | Price per minute, as stated | What the price includes | Free trial | Phone numbers | AI models you can choose |
|---|---|---|---|---|---|
| Synthflow | No per-minute rate: annual enterprise contract | Telephony, integrations, security review and launch support, scoped per contract | None | Synthflow telephony, SIP trunking or approved enterprise telephony | Not stated on the pricing page |
| Retell AI | $0.07 to $0.31 | $0.055 voice engine plus the LLM and voice you pick; phone extra ($0.015/min US on Retell's Twilio) | $10 in credits | $2/month; no charge on your own SIP trunk | GPT, Claude, Gemini, GPT Realtime, Grok Voice or your own LLM |
| ElevenLabs Agents | $0.08 per extra minute; plans $6 to $990/month include 75 to 12,375 minutes | Hosting, speech-to-text and voice; LLM billed on top; no telephony fee | Free plan, 15 minutes a month | Bring your own (Twilio or SIP trunk); the carrier bills you | Supported third-party LLMs, or your own model |
| Vapi | $0.05 platform fee; $82 to $129 per 1,000 minutes on its calculator | Hosting only; speech-to-text, LLM, voice and phone at provider cost | $5 in credits | 1 free Vapi number (5 on Core, $29/month) | Its full model catalog, at cost |
| Bland AI | $0.14 (Start), $0.12 (Build, $299/month) | LLM, speech-to-text and voice; phone billed separately | Free Start plan: "2 credits" and an inbound number, no card | 1 inbound number on Start; more are $15/month; or your own Twilio or SIP | Bland's own stack; no outside LLM picker in its docs |
| Telnyx | $0.05 voice engine | Orchestration, speech-to-text and voice; LLM tokens and phone extra; billed in 60-second steps | Free sign-up | US local $1.00/month; calls from $0.0032/min | Open models on Telnyx GPUs, or Anthropic and OpenAI models |
| Phonely | Plans $50 and $150/month with minutes; then $0.25 or $0.30/min | Agent, premium voices, transcripts; Pro adds AI SMS and CRM integrations | Not stated | 3 free (Starter), 5 free (Pro); SIP trunking | Phonely's own Alma model |
| Trillet | $0.12 after included minutes (white-label) | Platform, speech-to-text, LLM and voice; phone billed separately | 7 days, card required | Billed separately | Not stated |
| Thoughtly | Not published: quote from sales | Voice, SMS, email and workflows; unlimited voice minutes on every plan | 30 to 60 day pilot | Thoughtly numbers, or bring Twilio or Telnyx | GPT, Claude or Gemini; your own model on Enterprise |
| Rosie | $49 for 250 min to $299 for 2,000 min a month | Done-for-you answering, messages; booking and transfers from Scale ($149) | 7 days | Included; you pick the area code | None to choose; 10+ voices |
| Upfirst | Per call, not per minute: $24.95 for 30 calls, then $1.50 a call | Done-for-you answering, texting, booking, 35+ languages; spam calls not counted | 14 days, no card | Keep yours or use one Upfirst provides | None to choose; 40+ voices |
| My AI Front Desk | $99/month for 200 min ($79 billed yearly); extra minutes 25 credits ($0.25) | Voice plus web chat, SMS, CRM and automations | 7 days | Not stated on the pricing page | Not stated |
| PolyAI | Platform: per minute, quote only. Model API: 2 cents/min plus text tokens | Platform: model upgrades, maintenance, 24/7 support. API: model only, no phone or orchestration | $100 API credit for sign-ups before November 19 | Your numbers or PolyAI's; your own carrier over SIP at no charge | PolyAI's own models (Dialog-RSN-1, Raven) |
| Parloa | Per minute, custom | A volume package priced by use-case complexity | Not stated | Not stated | Not stated on the pricing page |
If you wanted Synthflow's self-serve, no-code builder
- Closest like-for-like: Retell AI. Pay as you go from $0, $10 of free credits, 20 concurrent calls included, and pre-built agent templates. Its pricing page itself makes the contrast with Synthflow: "Most voice AI platforms require annual contracts before you write a single line of code."
- Best-known voices, minutes in a plan: ElevenLabs Agents. The free plan includes 15 minutes a month and a workflow builder; Starter is $6 a month for 75 minutes, Creator $22 for 275. Extra minutes are $0.08, and the LLM is billed on top.
- One rate for the AI: Bland AI. The Start plan has no platform fee and no card, at $0.14 a minute for the model, speech and voice. See our Bland AI alternatives guide for its limits.
- The lowest stated base rate: Telnyx at $0.05 a minute including speech-to-text and voice, with LLM tokens and the phone line on the same invoice. Telnyx's own estimate for a production agent is about $0.06 a minute; note it rounds each call up to the next full minute.
- A no-code builder sold like a small-business app: Phonely, from $50 a month on Starter. Its pricing page is inconsistent: the plan card says 200 minutes and the comparison table says 250 (650 vs 750 on Pro), so confirm before you buy.
- Developers who will write code: Vapi, at $0.05 a minute plus each provider at cost. Our Vapi alternatives guide covers it and the open-source route.
Thoughtly, often listed next to these, does not fit this group: it sells all three plans through sales, with no published price; it offers a 30 to 60 day pilot and unlimited voice minutes, so it suits a revenue team that wants a quote, not a self-serve start.
If you are an agency that resold Synthflow
Synthflow still offers white-label, but only inside an annual enterprise agreement. Trillet is the self-serve option we found that is built for this: white-label plans from $99 a month with your brand and domain, 1,000 included minutes on Studio or 3,000 on Agency, then $0.12 a minute for the platform, speech-to-text, LLM and voice, with telephony billed separately. The 7-day trial needs a card. My AI Front Desk also sells a Partner tier for agencies, priced on request.
If you only need calls answered
Many Synthflow buyers were small businesses building a receptionist. A done-for-you product does that without a builder at all:
- Rosie: $49 a month for 250 minutes, $149 for 1,000 (adds calendar booking and transfers) and $299 for 2,000. That is about $0.20 down to $0.15 a minute by our math. 7-day free trial; English and Spanish on every call.
- Upfirst: priced per call, from $24.95 a month for 30 calls ($1.50 each after). 14 days free with no card, and spam calls do not count. Its page states its AI models never train on your customers' data.
- My AI Front Desk: $99 a month ($79 billed yearly) for 200 voice minutes, plus web chat, SMS and a CRM in the same plan. Extra voice minutes cost 25 credits, which is $0.25.
For more options in this group, see our best AI receptionist software and AI receptionist pricing guides.
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If you are an enterprise
If you are the buyer Synthflow now targets, compare it with its enterprise peers rather than with self-serve tools. PolyAI prices its platform per minute through sales, including model upgrades, maintenance and 24/7 support, and bills per second on connected time. It also opened a model-only API (Dialog-RSN-1) at 2 cents a minute plus text tokens, which excludes telephony and orchestration. Parloa uses consumption-based pricing (per minute for voice), with rates set by the complexity of each use case and a custom volume package. Neither publishes a list price for the full platform.
Frequently asked questions
Does Synthflow still have a free plan or pay-per-minute pricing?
No. As of November 9, 2026, Synthflow's pricing page says it is sold as an annual enterprise agreement, with no free plan or trial and no rate by the minute. You get a price after a scoping call.
What is the best Synthflow alternative for small businesses?
If you want to build your own agent, Retell AI (pay as you go, $10 of free credits) or ElevenLabs Agents (free plan, paid plans from $6 a month) are the closest. If you only need calls answered, Rosie (from $49 a month) or Upfirst (from $24.95 a month, 14 days free) are simpler.
Is there a white-label alternative to Synthflow for agencies?
Trillet sells self-serve white-label plans from $99 a month, with 1,000 or 3,000 included minutes and $0.12 a minute after that, plus telephony. It has a 7-day trial that needs a card. Synthflow's own white-label now comes only inside an annual enterprise agreement.
Which Synthflow alternative is cheapest per minute?
On stated base rates, Telnyx at $0.05 a minute including speech-to-text and voice, with LLM tokens and telephony extra; Telnyx estimates about $0.06 a minute for a production agent. Base rates are not comparable one to one, because each vendor includes different parts of the call.
Is Thoughtly a self-serve alternative to Synthflow?
No. On November 9, 2026, all of Thoughtly's plans were sold through sales with no published price. It offers a 30 to 60 day pilot and unlimited voice minutes on every plan.