Offline transcription on a Mac: which app is for which job

Three jobs that look identical on a feature list

Every app in this space says "Whisper, on-device, private". That tells you the engine, not the product. What separates them is where the audio comes from and what you get at the end.

Job one: dictation

You want to speak and have text appear where your cursor is. The audio source is your microphone, the output is a sentence, and speed matters more than anything.

macOS has this built in and it is genuinely decent. Apps like superwhisper exist because they are more accurate, work in any text field with a hotkey, and let you shape the output with prompts. superwhisper runs offline models well on Apple Silicon; on Intel Macs it leans on cloud models, which is worth knowing if privacy is the reason you are here.

TNN includes a quick dictation hotkey too, but if dictation is the whole job, a dedicated dictation app will beat it.

Job two: transcribing files you already have

You have an interview, a voice memo, a webinar recording. The audio source is a file, and you want text out with decent speaker handling.

MacWhisper is the well-known Mac answer, running Whisper locally over audio and video files. Buzz is the open-source one: MIT licensed, free, transcribes files offline with Whisper, and also does live microphone transcription. Buzz runs on macOS, Windows and Linux, which none of the Mac-only options do.

TNN transcribes existing audio files as well, so if that is an occasional task alongside meetings you are covered. If it is your main task, especially in bulk, a file-first tool is the better fit.

Job three: live meetings

This is the one the other categories cannot reach, and it is where most of the frustration in this search comes from.

A meeting is not a microphone and not a file. The audio you need is what your Mac is playing - the other people on the call - plus your own mic. You need it to start when the meeting starts, to know which meeting it was, and to end up as something you can find in three months.

A dictation app cannot do this, because it listens to you. A file transcriber cannot do this, because there is no file until afterwards. Buzz gets closer with live microphone transcription, but a microphone does not capture the person on the other end of Zoom.

Capabilities checked July 2026. Buzz details confirmed from its MIT-licensed repository; superwhisper from its own site. Deliberately no exact prices for the paid apps here - they change often and a stale number is worse than none. Check each vendor before you buy.

What "on-device" is worth, and where it stops

The honest case for local transcription is narrow and real. Your audio never becomes someone else's asset. There is no subprocessor to declare on a security questionnaire, no per-minute meter, and it keeps working on a plane. If your meetings include candidate interviews, compensation conversations, undisclosed incidents, or clients whose NDA enumerates processors, that matters more than any feature comparison.

What local processing does not buy you: a shared team archive, recordings of meetings you did not attend, or the polish of a company with a hundred engineers. Those are real trade-offs, not marketing asterisks.

Bot-free and local are two different things, and the apps that blur them are usually only one of the two.

How TNN differs from the rest of this list

TNN is the only one here whose unit of work is a meeting rather than a recording. It captures system audio so no bot joins the call, reads your calendar so it knows which meeting is starting, and writes one plain Markdown file per meeting containing your live notes, the transcript and an AI summary together.

The file format is the part that pays off later. Because meetings are plain text on your disk, TNN can expose them to Claude over MCP: Claude lists your meetings, reads notes and transcripts, runs skills you have saved, and writes results back into the meeting file. Ask what you promised a client across four calls and the answer comes from transcripts. That runs on your own Claude Pro or Max subscription, so there is no API key and no AI fee from us.

Pick by this, not by the feature list

• Mostly dictating - macOS dictation first, then superwhisper if you want better accuracy and hotkeys everywhere.
• Mostly transcribing files - MacWhisper on Mac, or Buzz if you want free, open source, and cross-platform.
• Mostly in meetings - TNN, or a cloud notetaker if you need a team workspace and do not mind the audio leaving your machine.
• Not on Apple Silicon - Buzz. Most of this category, TNN included, is Apple Silicon first.