Synthflow alternative

Switching from Synthflow is easy.

A published rupee price for the whole call, and a sandbox you can open today without a contract.

Synthflow’s numbers checked 25 October 2026.

Synthflow and Voice Infra at a glance
Synthflow Voice Infra
Published price
₹28,48,800an Enterprise contract starts at ($30,000 annually) ₹5a minute, everything included
Every detail, with sources

Side by side

Here is Synthflow beside Voice Infra.

Every price in rupees, from their own pages and ours.²

Languages

Languages and voices, Synthflow and Voice Infra
DetailSynthflowVoice Infra
Languages Hindi is the one Indian language on the list, on its own and inside the Multilingual mode that switches between English, Spanish, French, German, Hindi, Russian, Portuguese, Japanese, Italian and Dutch Synthflow STT is recommended for non-English languages docs.synthflow.ai Hindi, Gujarati, Marathi, Bengali, Tamil, Telugu, Kannada and Malayalam, plus Hinglish, in speech recognition and voice

Where it runs

Where it runs, Synthflow and Voice Infra
DetailSynthflowVoice Infra
Where it runs API regions Global, United States and European Union (api.eu.synthflow.ai), with EU and US hosting on the home page no India region is named docs.synthflow.ai Speech recognition and the model run on our own GPUs in India

Phone numbers

Phone numbers, Synthflow and Voice Infra
DetailSynthflowVoice Infra
Phone numbers U.S., Canadian, or Australian numbers bought inside the platform at $1.50 USD per month importing your own number from Twilio, Telnyx, Vonage, RingCentral, Zoom or a custom SIP carrier requires an Enterprise account docs.synthflow.ai Indian (+91) numbers: buy a dedicated number through us, or connect your own Plivo number

More

More, Synthflow and Voice Infra
DetailSynthflowVoice Infra
How a minute is counted Calls are measured per second and partial seconds are rounded up to the nearest second the seconds are added up across calls and each whole minute is a billing event; unanswered calls are recorded as a flat 5 seconds of usage; failed and user-cancelled calls are not billed docs.synthflow.ai 10-second blocks on every plan unanswered, busy and failed calls are not billed
Transfers and concurrency Cold transfer over SIP REFER and warm transfer with a message or an AI summary concurrency is scoped with Synthflow in the contract, with no number on the page docs.synthflow.ai No transfer to a person yet a new workspace starts with 5 calls at a time, raised when you ask
Compliance ISO 27001:2022, SOC 2, GDPR, HIPAA and PCI DSS V4.0.1 listed on the security page docs.synthflow.ai Speech recognition and the model run on our own GPUs in India the FAQ in our docs says where each part runs

Spot something out of date? Tell us. Every platform in one table: voice AI platforms compared.

Why switch

Why people switch to Voice Infra.

Everything a phone call in India needs, from one team, priced in rupees.

AI agents

AI agents: ₹5/min to start · ₹1.50/min all-in at volume.¹

Speech recognition, the model and the voice, in one rupee rate. Billed in 10-second blocks, so short calls stay cheap.

Eight Indian languages, live.

Hindi, Gujarati, Marathi, Bengali, Tamil, Telugu, Kannada and Malayalam. And the Hinglish in between, mid-sentence.

Speech recognition and the model run on our own GPUs in India.

The listening and the thinking: Mira STT and Gemma 4 26B. Mira TTS speaks.

One bill, in rupees.

The phone line, the platform, speech recognition, the model and the voice all come from us.

Live the same day.

Build in the sandbox, press Go live, and call today. Every company starts on pay as you go, with no monthly commitment.

Hear it before you decide.

Real lines from Mira TTS, one request each, unedited. Pick a language and press play.

Hear it

The rate is in the contract

Here is how Synthflow and Voice Infra differ.

Synthflow is an enterprise voice-agent platform with its own telephony, warm transfers and a long compliance list. Its pricing page carries one figure: contracts start at $30,000 a year, and the per-minute rate is in the agreement. We publish ours. Pay as you go is ₹5 a minute with the phone line inside, and steady volume takes it to ₹1.

Synthflow is built for the enterprise buyer. Its pricing page has one plan, Enterprise, and one number: contracts start at $30,000 a year. The rate per minute, the concurrency and the telephony setup are scoped in the agreement. That’s a fine way to buy if you have a procurement team and a quarter to spend.

Most Indian teams calling customers don’t. They want to know what a minute costs before they talk to anyone, and they want to hear the agent in their own language today. So we put the rate on the page. Speech recognition, the model and the voice are ours, and the first two run on our own GPUs in India. On pay as you go the phone line is in the price too.

What a call costs on each

On Synthflow, $30,000 a year is where the conversation starts. At the ECB rate that is ₹28.49 lakh, before the rate per minute you agree on. Its docs count calls per second, pool the seconds across calls, and record an unanswered call as 5 seconds.

Ours is ₹5 a minute on pay as you go, line included. So 1,000 minutes cost ₹5,000. When your volume is steady, the volume plan takes it to ₹1.50 a minute all-in. We bill in 10-second blocks, and if nobody picks up you pay nothing. The pricing guide shows how to forecast a month from your own call lengths.

Hear it.

Real lines from Mira TTS. Pick one, press play.

Text149 characters

Hi, मैं नेहा बोल रही हूँ Acme Store से। आपका order dispatch हो गया है और Friday तक deliver हो जाएगा। Address में कोई change करना हो तो अभी बता दीजिए।

48 kHz · MonoReady when you are

0:00 / 0:09

voice
Neha
language
Hinglish
speech
0:09
characters
149

Mira TTS, voice neha, rendered 16 Oct 2026. One request, not edited.

Text119 characters

नमस्ते, मैं श्रुति बोल रही हूँ, दाँतों के क्लिनिक से। कल सुबह डॉक्टर साहब से आपका मिलना तय है। क्या आप समय पर आ पाएँगे?

48 kHz · MonoReady when you are

0:00 / 0:08

voice
Shruti
language
Hindi
speech
0:08
characters
119

Mira TTS, voice shruti, rendered 16 Oct 2026. One request, not edited.

Text117 characters

નમસ્તે, હું આશુ બોલું છું. તમારી લોનનો હપ્તો આવતા અઠવાડિયે ભરવાનો છે. તમે કહો તો હું અત્યારે જ ભરવાની રીત સમજાવી દઉં.

48 kHz · MonoReady when you are

0:00 / 0:08

voice
Ashu
language
Gujarati
speech
0:08
characters
117

Mira TTS, voice ashu, rendered 17 Oct 2026. One request, not edited.

Text167 characters

வணக்கம், நான் நேஹா பேசுகிறேன். உங்கள் பார்சல் நாளை மாலைக்குள் வந்து சேரும். அந்த நேரத்தில் நீங்கள் வீட்டில் இல்லையென்றால் சொல்லுங்கள், வேறு நாளுக்கு மாற்றி விடுகிறோம்.

48 kHz · MonoReady when you are

0:00 / 0:10

voice
Neha
language
Tamil
speech
0:10
characters
167

Mira TTS, voice neha, rendered 17 Oct 2026. One request, not edited.

Text114 characters

నమస్కారం, నేను సమీర్ మాట్లాడుతున్నాను. నిన్న మీరు మా కొత్త ఇళ్ళ గురించి అడిగారు. ఇప్పుడు కొంచెం సేపు మాట్లాడవచ్చా?

48 kHz · MonoReady when you are

0:00 / 0:08

voice
Sameer
language
Telugu
speech
0:08
characters
114

Mira TTS, voice sameer, rendered 17 Oct 2026. One request, not edited.

Which to pick

Which is right for you?

Sometimes it's them. We'll say so.

Choose Synthflow if…

  • You are buying for a large team and want a contract with an SLA, escalation paths and launch support written in.
  • You need to hand a live call to a person today, warm or cold.
  • Your security review asks for ISO 27001, SOC 2, HIPAA and PCI DSS on one page.
  • You call the US, Canada or Australia, where Synthflow sells numbers directly.

Choose Voice Infra if…

  • You want to see the rate before you talk to anyone. Ours is on this page, in rupees.
  • Your customers are in India and speak Hindi, Gujarati, Marathi, Bengali, Tamil, Telugu, Kannada, Malayalam or a mix.
  • You want to start today, with no contract. The sandbox opens without an account.
  • You make a lot of calls. Our agents cost ₹1.50 a minute all-in on the volume plan.

Where Synthflow is ahead

Transfers. Synthflow hands a call to a person cold or warm, with an AI summary for the agent who picks up. We can’t do that yet. Compliance, too: its security page lists ISO 27001, SOC 2, HIPAA and PCI DSS, and it hosts in the US and the EU. And it sells numbers directly for the US, Canada and Australia, with your own carrier on an Enterprise account. We call India, on +91 numbers from us or from Plivo, and a new workspace starts with 5 calls at a time until you ask for more.

Moving

Moving your agent across is easy.

Bring the agent you have. Most of it carries across.

  1. Step 1

    Start free.

    Look around with no sign-up. We ask for an email only when you test a call, and the workspace gets its credit then.

  2. Step 2

    Bring your prompt.

    Paste the prompt you already wrote into Agent Studio, and pick a voice and a language.

  3. Step 3

    Talk to it. Go live.

    Test it in your browser or on your own phone, then go live the same day.

Moving an agent

Your prompt and greeting carry over into Agent Studio. A script with branches fits a node-based agent, and the prompt-or-nodes guide helps you choose. Bulk calls become a campaign that dials your list from a CSV, inside the hours you set, and pauses if the wallet runs low.

Then put both on your own phone, with your real script, and listen. The latency guide shows how to time the gap between the caller’s last word and the reply.

Questions

Here is what people ask before switching from Synthflow.

What does a minute cost on Synthflow?

Its pricing page doesn't say. The one figure on it is that Enterprise contracts start at $30,000 annually, about ₹28.49 lakh at the ECB rate, and the per-minute rate comes from your agreement. Ours is ₹5 a minute on pay as you go, with the phone line inside, and ₹1.50 all-in on the volume plan.

Can I try Synthflow before signing?

The pricing page points you to a sales conversation and lists one plan, Enterprise. With us you open the sandbox without an account, test a call with an email, and go live the same day.

Does Synthflow speak Indian languages?

Hindi, on its own and inside its Multilingual mode. Its list doesn't name Gujarati, Tamil or Telugu. Ours speaks all three, along with Hindi, Marathi, Bengali, Kannada and Malayalam, and the Hinglish in between, in speech recognition and in the voice.

Can I use my Indian phone numbers?

On Synthflow, importing your own number needs an Enterprise account, and the numbers it sells directly are for the US, Canada and Australia. With us, buy a +91 number from us or connect the Plivo number you already have.

Still deciding? Ask us.

Fifteen minutes with the team that builds it. Bring your script, or your hardest call.

Book 15 minutes

Book a call

15 minutes with Sneh Mehta

Finding a time for us…

  1. AI agents: T5 is ₹5 a minute, pay as you go, with our phone line and call insights included. At volume, T1 is ₹1 a minute on ₹1,00,000 a month, and ₹1.50 with our phone line (₹0.30) and call insights (₹0.20). Prices exclude GST.

  2. Synthflow’s figures are from its own pages, linked beside each one and listed under Sources, checked . Ours are from our price list and docs.

Start free