PRODUCT
RTZR STT
COMPANY
We bring practical AI to the world

The Future of Next-Generation
Speech AI - Start Now

Everywhere you need Voice AI

ReturnZero's AI services

B2B

A tailored AI solution for businesses in need of speech recognition. From the AI call center of the country's top financial institution to public agencies and fire departments, proven success stories attest to the top-notch performance.

B2B

Your online meeting archive and analysis tool - available for personal and corporate use. Callabo will be your AI intern that attends every meeting and takes notes

B2C

An Android app that completely revolutionizes the calling experience of over a million users. This app automatically transcribe all your calls and make it search-able

B2C

Simply input a YouTube link, and Shorts are created. AICO will bring an AI magic for shorts creators

ReturnZero's AI services

B2B

A tailored AI solution for businesses in need of speech recognition. From the AI call center of the country's top financial institution to public agencies and fire departments, proven success stories attest to the top-notch performance.

B2B

Your online meeting archive and analysis tool - available for personal and corporate use. Callabo will be your AI intern that attends every meeting and takes notes

B2C

An Android app that completely revolutionizes the calling experience of over a million users. This app automatically transcribe all your calls and make it search-able

B2C

Simply input a YouTube link, and Shorts are created. AICO will bring an AI magic for shorts creators

Where and how it worked?

Finance
Shinhan Bank AICC (#1 bank in Korea)

Next-generation AI call center with RTZR STT

CSB2B SaaS
ChannelTalk sales team

Sales meeting will tell your future revenue

Fire DeptGovernment
Gwangju Fire Department

The most reliable and accurate AI chosen by the fire department.

AICC
MindWareWorks

Perfectly handles Japanese AICC, including complex addresses and numbers

CounselingDivination
Chun-Myung (fortune telling app)'s fortune counseling transcription

User's purchase conversion rate has tripled after experiencing free trascription add-on service

Where and how it worked?

Finance
Shinhan Bank AICC (#1 bank in Korea)

Next-generation AI call center with RTZR STT

CSB2B SaaS
ChannelTalk sales team

Sales meeting will tell your future revenue

Fire DeptGovernment
Gwangju Fire Department

The most reliable and accurate AI chosen by the fire department.

AICC
MindWareWorks

Perfectly handles Japanese AICC, including complex addresses and numbers

CounselingDivination
Chun-Myung (fortune telling app)'s fortune counseling transcription

User's purchase conversion rate has tripled after experiencing free trascription add-on service

Top investors are supporting RTZR

Atinum
Bass Investment
Woori Venture Partners
Hana Ventures
Kakao Ventures
Company K Partners

Experience the most accurate and fastest speech recognition in Korea

A versatile voice AI, RTZR STT excels across diverse applications—from finance and call centers to mobile apps and video processing. Supporting both Cloud and On-premise deployments, it stands as Korea's most popular speech recognition engine.

1. 20% faster conversion speed compared to competitors with the most powerful E2E model.
2. Per-second prices from 1.5 times to 3 times lower than competitors. Save your budget.

Compared to competitors
35
%
lower error rates
In phone noise
48
%
lower error rates
Compared to competitors
2.5x
faster conversion
Up to
3x
cheaper per second

The new standard in AI speech recognition

Precision in speech recognition is essential. RTZR STT delivers unparalleled Korean and Japanese speech recognition tailored for business needs.

Accuracy (Error Rate)
Batch processing speed
(1 hour)
Real-time response processing
Speaker isolation
Custom vocabulary recognition
Additional learning
Language model incremental learning
Sentence punctuation
Profanity filter
RTZR STT
4.66%
38seconds
< 300ms
~10speakers

We used an hour long non-biased audio dataset of Korean conversational speech. You can test it anytime with the RTZR STT API.

NAVER
9.09%
90seconds
~10speakers
Google
14.11%
1440seconds
800-2000ms
~6speakers
OpenAI
17.27%
158seconds

What the difference?

Unparalleled Voice Data

The voice data—sourced from our call transcription app VITO with 1 million users—totals 15 million hours. This is equivalent to 1712 years, making it the largest dataset in the country.

Operates in Any Environment

Cloud? On-Premise? No issue. RTZR STT functions in any setting, with optimal performance guaranteed.

Ready for Immediate Deployment

Chosen as the most reliable speech recognition technology by Korea's top financial group.

Easy-to-Use API

Integrate our API easily with just a few lines of code. Experience real-time and batch speech recognition at no extra cost.

An AI assistant that automatically records and analyzes all meetings.

Turn disappearing meeting content into data assets.

With Callabo, video and text from online meetings like Google Meet and Zoom are automatically recorded and summarized. You can check and share voices and even an atmosphere of meetings you missed. This will help you can your team commiunicate clearly.

Read your calls - every call converted into text, VITO

Read and search your calls like text messages - VITO has more than 1 million users

This app will convert all calls into text, allowing you to read and search like text messages. This will completely transform the experience of all calls, from everyday life to business calls in various professions.

Create Shorts in just 3 clicks - AICO

AI Short-Form video tool for creators! Just insert a link and complete your Shorts

Boost your YouTube channel with a single click. Quickly create multiple Shorts through AICO. GPT-4 automatically finds the most interesting parts of the video, adds subtitles, and edits them.