Independent testing from Japan
We test transcription tools with real Japanese audio, then a native Japanese reviewer checks every number, name, and kanji choice by hand.
Updated August 9, 2026 · Three controlled recordings
CONTEXT TEST
橋の端で箸を落とした。
Preliminary—not a final winner. More real-world tests are coming.
01 Recorded in Japan
02 Reviewed by a native speaker
03 Same audio for every tool
04 Weaknesses published
Early benchmark results
These are hands-on results from three short, clean, single-speaker clips. They show meaningful differences, but they are not yet a final ranking.
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MEETING & NOTES
No major meaning errors across three clean recordings—and the only tool to choose 橋, 端, and 箸 correctly from context.
Watch out: Numbers were usually written in kanji, and the invented name ミライテック became 未来テック.
AUDIO TRANSCRIPTION
Produced the cleanest casual-speech result and kept every self-correction clear in test 03.
Watch out: 橋の端で箸 became 橋の橋で橋, despite the polished-looking output.
AUDIO TRANSCRIPTION
Preserved every final intended detail in casual speech, but made one clear letter-label error.
Watch out: It wrote 会議室B as 会議室日 in test 03 and 橋の端で箸 as 橋の橋で橋 in test 02.
MEETING & NOTES
Recognized ミライテック and two of three homophones, but changed a price and could not accept test 03.
Watch out: 1万2,800円 became 12,008百円—a materially different amount if read literally.
WEB TRANSCRIPTION
The no-signup web converter accepted all three recordings but failed during processing every time.
Watch out: This is a web-tool reliability finding, not an accuracy verdict. The signed-in app may behave differently.
Biggest lesson so far
Polished text can still be confidently wrong.
Sonix reported high confidence while writing 橋の端で箸 as 橋の橋で橋, then heard 会議室B as 会議室日. Otter changed ¥12,800 into a materially different amount, while JotMe failed to return text for three different files. Native review still matters.
Our method
Every tool receives the same original audio. We separate recognition mistakes from punctuation and formatting, and we do not score a tool that fails to produce a transcript.
A short, naturally paced recording used to check basic content accuracy and punctuation.
Dates, prices, an address, an invented company name, ChatGPT, and 橋・端・箸 in context.
Fillers, four self-corrections, shortened phrases, times, responsibility, and agenda details.
Background sound, overlapping voices, speaker labels, and real correction time.
A transcript can look polished to a non-Japanese speaker while getting names, kanji, politeness, or meaning wrong. Native Japanese AI Lab is built in Japan to make those mistakes visible—and help international users choose with confidence.
The product buttons currently use ordinary direct links, so we earn no commission. If affiliate links are added later, each one will be labeled clearly beside the button. Compensation never changes our test files, scoring method, ranking, or the weaknesses we publish.