---
title: "CLOVA Speech Recognition prerequisites"
slug: "csr-spec"
updated: 2026-09-17T09:18:03Z
published: 2026-09-17T09:18:03Z
canonical: "guide.ncloud-docs.com/csr-spec"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://guide.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CLOVA Speech Recognition prerequisites

Available in Classic and VPC

View supported environments, pricing plans, and service limits, etc., for smooth use of CLOVA Speech Recognition.

## Cloud environment specifications

CLOVA Speech Recognition supports the following cloud environment specifications:

| Item | Specifications |
| --- | --- |
| Region (zone) | Korea, U.S., Singapore, Japan, and Germany |
| Platform | VPC, Classic |
| Language | Korean, English, and Japanese |

              Note

              

The languages in the cloud environment specifications refer to languages supported in the NAVER Cloud Platform console. For the types of languages recognized by CLOVA Speech Recognition, see [Precautions when using the service](/docs/en/csr-spec#%EC%84%9C%EB%B9%84%EC%8A%A4%EC%9D%B4%EC%9A%A9%EC%8B%9C%EC%A3%BC%EC%9D%98%EC%82%AC%ED%95%AD).

## Precautions when using the service

Cautions for using CLOVA Speech Recognition are as follows:

- Support languages: Korean, English, Japanese, and Chinese (simplified)
- Maximum speech length that can be recognized when calling the CLOVA Speech Recognition API once: 60 seconds
- Minimum sample rate of the original sound source file: 16 kHz or higher
- API service usage limits: for each application, you can adjust yourself from 300,000 seconds per month (30,000 seconds per day) to 30,000,000 per month (10,000,000 seconds per day), and if you wish to raise the service usage limit beyond the range that you can adjust yourself, use [Contact us](https://www.ncloud.com/support/question/service) on the NAVER Cloud Platform portal

## Specifications

CLOVA Speech Recognition supports the following specifications:

| Item | Specifications |
| --- | --- |
| Mobile SDK platform | - Android 2.3.3 (API level 10) - iOS 8 or higher |
| REST API voice file format | mp3, aac, ac3, ogg, flac, wav |

## Pricing information

CLOVA Speech Recognition uses a pay-as-you-go pricing plan. For details of CLOVA Speech Recognition’s usage fee, see the pricing information at portal's **Services >AI·NAVER API > CLOVA Speech Recognition** menu.

- [**Portal > Services > AI Services > CLOVA Speech Recognition**](https://www.ncloud.com/product/aiService/csr)