Thunder Kitty for Lawyers
Privileged conversations stay on your device
Thunder Kitty gives attorneys a transcription tool that never risks waiving privilege.
Legal practice runs on conversations — client intakes, strategy sessions, witness prep, deal negotiations. Every one of those conversations needs to be captured accurately and kept confidential. The tools built to help with this send your audio to cloud servers for processing. That introduces a third party into communications that may be privileged. Thunder Kitty doesn't. Transcription runs on your Mac using Apple's on-device speech engine. Nothing leaves your device. The privilege analysis stays clean.
The third-party problem in cloud transcription
Attorney-client privilege can be waived by voluntary disclosure to a third party. Cloud transcription services — even reputable ones — are third parties. When you send a client conversation through an external API for processing, you're creating a record of that communication on infrastructure you don't control, under terms of service your client never reviewed. For routine internal meetings this may be acceptable. For client strategy calls, witness prep sessions, M&A discussions, and sensitive negotiations, the question isn't whether the service is secure. It's whether the data left your control at all. With Thunder Kitty, it doesn't.
What a client call looks like with Thunder Kitty
Before the call
Open Thunder Kitty and start a note linked to the meeting. Add agenda items — topics to cover, questions to ask, issues to resolve. Your preparation is structured and ready before the call begins.
During the call
Hit record. Transcription starts immediately on your Mac using Apple's SpeechAnalyzer — accurate, real-time, entirely on-device. You stay focused on the conversation. Thunder Kitty captures who said what with speaker separation across all participants.
After the call
Each agenda item gets its own AI summary — what was discussed, what was decided, what's outstanding — generated on your Mac using a local model. Your notes and transcript save as plain Markdown files in your Documents folder. Searchable, portable, ready to produce if needed. No vendor cooperation required.
Why attorneys use Thunder Kitty
No third party ever touches the audio
Cloud transcription tools process your audio on external infrastructure. Thunder Kitty processes audio on your Mac using Apple's built-in speech engine. Nothing is transmitted. No third party receives, stores, or processes the content of your client communications.
Real speaker separation across all participants
Thunder Kitty does actual speaker diarization. Enroll your own voice once and it's always correctly labeled. Other participants are separated individually — Speaker 1, Speaker 2 — regardless of call size. You know who said what, which matters when the record matters.
Your files, your terms
Transcripts and notes save as plain Markdown files in your Documents folder. No vendor database. No export workflow. No subscription required to access your own records. If you need to produce documents, they're already files you control — straightforward to preserve, search, and hand over on your terms.
Real-time agenda tracking, on-device
Thunder Kitty tracks your meeting agenda in real time as the conversation progresses. See at a glance which topics have been covered and which haven't, without breaking focus. Post-meeting, each agenda item gets its own AI summary generated entirely on your Mac. No cloud inference. Nothing leaves.
A record that's straightforward to produce
When documents need to be preserved under a litigation hold or produced in discovery, your transcripts are already plain text files in your Documents folder. No vendor portal, no export request, no waiting on a third party. The record is yours, in a format any system can read, under your control from the moment the meeting ends.
How lawyers use it
- Transcribing client intake calls and strategy sessions
- Recording witness preparation and deposition review discussions
- Capturing partner meetings and case conferences
- Documenting M&A discussions and deal negotiations
- Searching across matter history by topic, issue, or client concern
Common questions
Does Thunder Kitty require a bot to join my calls?
No. Thunder Kitty captures audio directly from your Mac — your microphone and system audio — the same way QuickTime would. Nothing joins the meeting. The person on the other end gets no notification, no “Thunder Kitty has joined” prompt, nothing.
Does it work with Zoom, Teams, FaceTime, Meet, and other platforms?
Yes. Thunder Kitty isn’t platform-specific — it captures whatever audio is playing on your Mac, regardless of the app. Zoom, Google Meet, Microsoft Teams, Discord, FaceTime, phone calls via your iPhone’s Handoff, or no video app at all. If audio is happening on your Mac, Thunder Kitty can record it.
How accurate is the transcription?
Very. Thunder Kitty uses Apple’s SpeechAnalyzer — the same on-device engine powering Apple Intelligence — which delivers professional-grade accuracy for English, running entirely on your Mac. It handles natural speech, crosstalk, and varying audio quality well. Non-English language support depends on what Apple’s engine supports on your system.
What happens to my notes if I cancel my subscription?
Nothing changes. Your notes and transcripts are plain Markdown files sitting in a folder on your Mac. They were yours before you subscribed and they’re yours after you cancel. There’s nothing to export because there’s nothing locked in. You lose the recording and transcription functionality. You keep everything you’ve written and recorded.
Can I search across my entire meeting history?
Yes — in a few different ways. Your notes are plain Markdown files, so macOS Spotlight searches across all of them. You can also open the folder in Obsidian, iA Writer, or any notes app. For more powerful querying, Thunder Kitty runs as a local MCP server for Claude Desktop: ask questions across months of transcripts directly from Claude’s interface, with no data leaving your Mac.
Does sending audio to a cloud transcription service risk waiving attorney-client privilege?
This is a legitimate concern worth thinking through carefully. The third-party doctrine holds that voluntary disclosure to a third party can waive privilege. Cloud transcription services are third parties: when you send a client conversation to an external API for processing, you’re creating a record of that communication on infrastructure you don’t control. Whether any particular disclosure would constitute a waiver is a factual and jurisdictional question — but Thunder Kitty eliminates the question entirely. Audio is processed on your Mac. No third party ever receives it.
Can opposing counsel subpoena my transcripts from Thunder Kitty?
There’s nothing at Thunder Kitty to subpoena. We don’t store your audio, transcripts, or notes on our servers — ever. Your transcripts are plain files on your Mac, governed by the same legal rules as any document under your control. A subpoena served on us would return nothing, because we have nothing.
Does Thunder Kitty work for in-person client meetings, not just phone and video calls?
Yes. Thunder Kitty captures your Mac’s microphone, so it works for any meeting where your Mac is in the room — client offices, conference rooms, your desk. Audio quality depends on microphone placement and ambient noise, but the transcription engine handles real-world conditions well.
How do I preserve a Thunder Kitty transcript under a litigation hold?
Your notes and transcripts are plain Markdown files in your Documents folder. Preserving them means the same thing it does for any document: copy to a litigation hold folder, back up to external storage, or hand to your IT team. No vendor cooperation required, no export tool, no calling a support line. They’re files.
Is Thunder Kitty appropriate for depositions or formal legal proceedings?
Thunder Kitty produces an accurate, speaker-attributed transcript suitable for preparation, review, and note-taking. It’s not a certified court reporter or an official legal transcript service — the transcript is a working document for your use, not a formal record for submission. For your own preparation, witness review, and case development, it’s excellent.
Try Thunder Kitty free for 7 days. No credit card. No account. Just a download.
Download for macOSTry it on a client call with Airplane Mode on. If the transcript is accurate and nothing left your Mac, you have your answer.