Best Voice AI for Indian Languages: What to Test Before Buying

Why a language list tells you almost nothing

Voice AI sites advertise language counts: 40+, 50+, 70+, 100+, even 500+. These are claims about coverage, and coverage is not quality. A vendor can list a language because its speech recogniser can transcribe it, even if the voice sounds foreign, the agent mishandles numbers or the conversation falls apart when the caller switches to English halfway through a sentence.

Real Indian business calls are rarely in one clean language. A caller in Pune starts in Marathi, drops in the English word 'appointment', quotes a price in lakh and ends in Hindi. A caller in Chennai says 'neenga tomorrow evening call pannunga'. Callers in Hyderabad, Bengaluru and Kochi do the same in Tenglish, Kanglish and Manglish. A voice agent that cannot follow that is not usable in those markets, whatever its feature page says.

So the useful question is not how many languages a vendor supports. It is how well the agent handles your language, your city's accent and the English your customers mix in. Only a test call answers that.

What vendors say about Indian languages

The table lists what each vendor states publicly, with the Indian languages it names and what it leaves unnamed. A larger number is not a reason to rule a vendor in or out. It is a reason to ask which languages you will actually test.

Two observations follow. First, Gnani.ai and SquadStack name languages that Outpero does not support, including Bengali and Gujarati. If your customers speak those, they are the better fit and Outpero is not an option. Second, most vendors that claim large numbers do not name the languages, which makes the claim impossible to verify before a demo.

The seven-part test

Run these on any vendor, including Outpero. Use real speakers from your target city, a normal mobile phone and a noisy room, not a studio recording. Record every call and score it afterwards.

1. 01Code-switching. Start in your language and switch to English mid-sentence, then switch back. The agent should follow without asking you to repeat or changing the language of its reply to something stiff.
2. 02Numbers and money. Say a phone number digit by digit, an amount such as three lakh fifty thousand, a date and a time. Ask the agent to repeat them back. This is where many agents fail.
3. 03Names and places. Give a local surname, a locality such as Gachibowli, Kondapur, Koramangala or Kothrud, and a company name. Check the transcript for spelling and the voice for pronunciation.
4. 04Interruption. Talk over the agent mid-sentence with a short word such as 'haan' or 'wait'. A good agent stops and listens, and does not talk through you or restart from the beginning.
5. 05Noise and speakerphone. Call from a busy road or a room with a fan, on speaker. Accuracy always drops, and the question is how gracefully.
6. 06Register. Check that the agent uses the respectful form, and that its Hindi, Telugu or Tamil sounds like a business call and not a textbook or a film dialogue.
7. 07Latency. Time the pause between your last word and the agent's first. Outpero's end-to-end figure is 0.8 to 1.3 seconds on average. Whatever a vendor claims, measure it yourself on a phone line, since studio demos run faster than real calls.

Test sentences in six languages

Use sentences like these, which mix English words the way a real caller would. Read each one naturally, not slowly. The right-hand column says what to listen for.

How to score the calls

Make twenty calls per language you care about, with at least three different speakers, and score each on four questions: was the intent understood, were the numbers and names captured correctly in the transcript, did the agent sound like a person from that market and did the conversation reach a clear next step. A simple pass or fail on each question is enough.

Treat any vendor that will not let you run the test, or only offers a scripted demo, as having answered the question. Outpero's signup gives 50 free credits with no card, which is about ten minutes of Standard calling, enough for a first round in two or three languages.

Failure patterns to watch for

Across languages, the same handful of failures show up in test calls. Knowing them in advance makes the scoring faster and the vendor conversation more specific.

• —The agent answers in a different language from the one you used, usually Hindi or English, because it lost the thread after a code-switch.
• —Numbers come back wrong in the transcript, for example a lakh figure recorded as a thousand, or a phone number with a swapped digit.
• —The voice is fluent but formal, using written-style words that no one says on a phone call.
• —Place names and surnames are mangled, which is embarrassing when the agent reads a name back to the caller.
• —The agent talks over a short interruption and finishes its whole sentence before listening.
• —A long silence follows every reply, which callers read as a dropped line and often hang up on.

Write down which of these you hear, in which language and from which speaker. A pattern that appears in only one language is a language problem. A pattern that appears everywhere is a product problem.

Where Outpero fits

Outpero's position is specific. It is a pan-India specialist in regional-language voice AI, with seven languages live: Hindi, Telugu, Tamil, Marathi, Kannada, Malayalam and Indian English. In each, the agent switches to English the moment the caller does, in the same voice, whether that is Hinglish, Tenglish, Tanglish, Kanglish, Manglish or Marathi-English. The per-minute price is the same in every language: ₹5 for Standard and ₹6.8 for Premium, excluding 18% GST.

The limits are plain. It does not support Bengali, Gujarati, Punjabi, Odia, Urdu or Assamese. It does not have the 40, 70 or 500 language counts that other sites advertise. A business that operates in the seven live languages gets depth and a single published price. A business that needs one of the others should look at a vendor that names it, and test it the same way.

Choosing by your situation

• —Your customers speak Hindi, Telugu, Tamil, Marathi, Kannada or Malayalam and mix in English: shortlist regional-language specialists and run the seven-part test in your city.
• —You need Bengali, Gujarati or Punjabi: choose among vendors that name them, such as Gnani.ai or SquadStack, and test those languages specifically.
• —You serve a very large enterprise with on-premise or private deployment needs: expect a sales-led vendor, a longer pilot and no published price.
• —You are a small business with one or two languages and a small budget: prefer a vendor that publishes a price and gives you free test credits.

Frequently asked questions