Reference table
Transcript redaction routes compared
What four ways of removing personal details from interviews actually remove, and what they leave behind
A side by side comparison of the main ways research teams remove personal details from interview transcripts: scrubbing by hand, redaction in Dovetail and Marvin, speech-to-text APIs such as AssemblyAI and Azure AI Language, and Koji's per-study setting. Use it to pick a route before a security review or before sharing quotes widely. Koji cleans each transcript when the interview finishes, before analysis runs.
Where this appears
What's in this reference table
| Route | What it removes | When it runs | Original and recording | Who turns it on |
|---|---|---|---|---|
| Manual scrub | Whatever the person editing spots | Before each share | Both stay where they were saved | Anyone with the file |
| Dovetail | Names, addresses, emails, phones, bank details by default | As data is imported | Video can be blurred and muted, ask about the original | Workspace admins |
| Marvin | Names, emails, banking details, nationality, race, gender | Per file, minutes to hours | Audio and video can be masked | Admins, file by file |
| Speech API (AssemblyAI, Azure) | The entity types you pick in code | When the audio is transcribed | Redacted audio, or timings to cut it | Your developers |
| Koji | Names, emails, phones, addresses, employers | When each interview finishes | Original overwritten, recording dropped if anything removed | Whoever runs the study |
Use this image
Free to use in your docs, decks and posts under CC BY 4.0, as long as you credit Koji with a link to this page. To embed it, paste this into your page:
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<a href="https://www.koji.so/visuals/transcript-redaction-routes-compared"><img src="https://www.koji.so/visuals/transcript-redaction-routes-compared/transcript-redaction-routes-compared.png" alt="Table comparing manual scrubbing, Dovetail, Marvin, speech APIs and Koji by what each removes, when it runs and what happens to the original" width="1200" height="915" /></a>
<p>Source: <a href="https://www.koji.so/visuals/transcript-redaction-routes-compared">Transcript redaction routes compared</a>, Koji</p>
