For Mac  ·  Apple Silicon  ·  Free Trial

Stop rewatching.
Start studying.

Harvestry transcribes your videos — lecture recordings, online courses, tutorials, conference talks — captures the key screenshots, and exports a polished, interactive study document — entirely on your Mac, entirely in private.

Download for macOS → See how it works ↓

Requires macOS 15 or later  ·  Apple Silicon

Harvestry — knowledge harvested
Library
＋ ⋯
▾ Physics
Feynman Messenger Lectures
Complete
▶
MIT 18.065 — Linear Algebra
Complete
▾ Computer Science
▶
CS231n — Convolutional Nets
Transcribing…
▶
Philosophy of Mind — Week 3
Pending
Unfiled
▶
Organic Chemistry — Lecture 7
Pending
▤
5 videos
◷
4h 12m total duration
≡
47.3k words
⊡
163 screenshots
The Law of Gravitation — Lecture 1
Export HTML ⚙
Feynman lecture 1964
Richard Feynman, Cornell University, 1964 — via Wikimedia Commons
21:04
1:02:33 ◀ Seek to Clear ▶ + Add to Transcript
Feynman Messenger Lectures — Lecture 1: The Law of Gravitation
1:02:33 Duration
847 MB File Size
1920×1080 Resolution
Pipeline
✓Transcription
✓Screenshot Capture
✓LLM Consolidation
✓Export Page
Completed
Show in Finder Open in Browser
Transcript
47 passages · 2,341 words · 34 screenshots Copy
16:31

The gravitational force between any two objects is proportional to the product of their masses and inversely as the square of the distance. F = Gm₁m₂ / r². Every object attracts every other object.

Screenshot — Feynman at blackboard
18:47

Kepler found the ellipse empirically from Brahe's data. Newton showed why it must be an ellipse. That's the difference between observation and understanding.

Note

Key: Kepler described the orbit, Newton explained it. Same pattern throughout physics.

21:04

The impressive thing is the universality. The same law — same equation, same constant G — works for the apple, the moon, Jupiter's moons, and the double stars.

24:18

Nature uses only the longest threads to weave her patterns, so each small piece of her fabric reveals the organization of the entire tapestry.

On-device transcription

WhisperKit runs entirely on the Apple Neural Engine. Five model sizes, fully offline, zero cloud fees — no audio ever leaves your Mac.

Intelligent screenshots

Coverage-based scene detection fires when the content changes, not when the presenter moves. Blur analysis ensures every captured frame is worth keeping.

Beautiful HTML export

A self-contained study page that opens in any web browser — on your Mac, iPhone, or any device. Live word highlighting, text annotations, audio sync, and dark mode built in. No internet required.

Transcription

Research-grade accuracy.
Zero cloud fees.

Harvestry uses WhisperKit — Argmax's optimised framework for running OpenAI's Whisper on Apple Silicon. Every word is processed on the Apple Neural Engine, the dedicated ML accelerator in every M-series chip. No API key. No audio upload. No subscription.

Five model sizes let you dial in exactly the right tradeoff for your video. Tiny finishes a 90-minute video in minutes. Large Turbo captures technical vocabulary, proper nouns, and accented speech that smaller models miss.

5
Model sizes
100%
On-device
5
Languages
Harvestry Settings — Transcription Model panel showing five Whisper model sizes
Harvestry transcript panel showing captured screenshots alongside timestamped passages
Screenshot Capture

Smart enough to know what matters.

Not every frame deserves a screenshot. Harvestry's capture pipeline understands the difference between a slide transition and a webcam thumbnail bouncing in the corner — and only fires for the former.

  • Coverage-based detection.A frame only triggers capture when more than 20% of pixels genuinely change — a small moving webcam at 5–10% never qualifies.
  • Grid-based blur rejection.Sharpness is evaluated using Variance of Laplacian (VoL) across a 3 × 2 grid of cells. Measuring each region independently means a sharp presenter face in any corner can't rescue blurry slide content — the blurry cells are caught on their own terms.
  • Codec compatibility.VP9 and AV1 video (common in YouTube 1080p) are transcoded to H.264 automatically before capture runs.
  • Guaranteed coverage.A configurable interval (15 s – 2 min) ensures a screenshot appears even during long, static slides.
Manual Curation

The algorithm picks.
You perfect it.

Automated capture is thorough, but you know your video better than any algorithm. Harvestry gives you a full suite of curation tools so you can take the result from good to exactly right — without rerunning any processing.

  • Full scrubber timeline.Navigate anywhere in the video by dragging. The current time and total duration are always visible.
  • Seek to Clear.Paused on a blurry frame? Press ◀ or ▶ to step to the nearest sharp, clear frame in that direction — automatically.
  • Add to Transcript.Capture any video frame at full resolution and insert it into the transcript in timestamp order with one press.
  • Remove screenshots.Hover over any screenshot in the transcript panel and click Remove. Instant.
  • Inline notes.Add your own annotations anywhere between transcript passages.
  • Margin notes.Select any phrase and attach a short annotation that appears in the document margin alongside the anchor text — amber-underlined, connected by a dotted line, exactly like handwritten marginalia.
  • Text highlights.Select any phrase and apply one of four colours. Highlights are stored in the app and baked into the HTML at export — visible to anyone who opens the file, no interaction required.
  • Set a title image.Right-click any screenshot to make it the hero image at the top of your exported document.
Harvestry video player showing the scrubber timeline, Seek to Clear, and Add to Transcript controls
Marginalia & highlights in the exported HTML
Annotation

Marginalia that travel
with the document.

All markup is created in the app and baked into the exported HTML — not applied later in the browser. Share the file and the annotations are already there, visible to anyone, in any browser.

  • Margin notes.Select any phrase in the transcript, press the annotation icon, and write a short note. In the export it appears in the left or right margin alongside the amber-underlined phrase, connected by a dotted line — the look of handwritten marginalia on a printed page. On narrow screens they stack cleanly below the passage.
  • Text highlights.Four colours — yellow, green, blue, pink. Applied from the transcript panel, embedded as <mark> elements in the HTML. Visible the instant the file opens.
  • Inline notes.Drop a note anywhere between passages — after a key definition, between a screenshot and the next sentence. They appear inline in the exported document.
HTML Export — Opens in Your Browser

A document worth reading.

The export isn't a raw text dump. Harvestry generates a polished, fully self-contained HTML page you open directly in Safari, Chrome, or any browser — styled like a high-quality editorial publication, with live audio playback, per-word highlighting, and text markup built in.

Exported Study Document Screenshot of the HTML export in a browser — full page view
Live Word Highlight

As the video plays, each word lights up in real time. Click any timestamp to jump to that moment.

Highlights & Marginalia

Four highlight colours and margin notes are created in the app and baked into the HTML — visible to anyone the moment the file opens, no interaction required.

Dark Mode

Toggle with one click. Theme and font-size preferences persist across every reload.

Offline Forever

No CDN fonts. No remote scripts. Works in any browser, on any device, with no internet — today or in ten years.

Privacy

Almost everything stays on your Mac.

Transcription, screenshot capture, and HTML export all run locally. No audio, no video, and no images are ever transmitted anywhere. The core pipeline has no network dependencies beyond the video download itself.

The one optional exception: if you choose to use the Claude API for LLM consolidation, your transcript text is sent to Anthropic's servers over HTTPS. This step is always opt-in — the base processing pipeline is fully local whether or not you use it. The Pro tier supports local Ollama models instead, keeping even that step entirely on-device.

Transcription — Apple Neural Engine
WhisperKit processes audio entirely on-chip. No API calls. No uploads. Your spoken words stay on your device.
Screenshots — GPU & Hardware Decoder
AVFoundation extracts frames using VideoToolbox. All processing is local. Images never leave your machine.
Both run simultaneously
Because transcription and capture use different hardware, they run in parallel. A 90-minute video completes both stages at the same time.
HTML Export — Fully local
Export generation reads from your disk and writes to your disk. The only network call is the optional yt-dlp video fetch.
LLM Consolidation

From transcript to insight.

A raw transcript is accurate. It isn't always elegant. Spoken content is conversational, not written — presenters repeat themselves, revise mid-sentence, and circle back. The optional consolidation stage sends your transcript through an LLM and produces a second, refined version of your study document: same facts, same structure, clearer writing.

Standard
Claude API

Routes your transcript through Anthropic's Claude API. Produces consistently high-quality, well-structured academic prose. Fast, with no local setup required beyond an API key.

⚠ Transcript text is sent to Anthropic over HTTPS. Use local Ollama instead if your video contains sensitive material.

Pro — Fully Local
Local Ollama

Connects to a locally running Ollama instance. Any compatible model — Llama, Mistral, Gemma, and others. Nothing leaves your Mac. No per-token cost. No internet required.

Requires a capable Mac and a few minutes of Ollama setup. Once running, it is completely private and free of any external dependency.

The consolidated document flows into the same HTML export pipeline as the base transcript — same typography, same audio sync, same layout. Both versions are fully editable in Harvestry before export. Coming soon

Localisation

Available in five languages.

Every label, prompt, status message, and tooltip is fully localised. Harvestry respects your macOS language preference automatically — no configuration required.

🇬🇧 English 🇩🇪 German 🇮🇹 Italian 🇪🇸 Spanish 🇫🇷 French

Ready to learn more from everything you watch?

Download Harvestry and turn your first video into a study document — free. No subscription, no account. Drop in a file or paste a URL and press Begin Processing.

Download for macOS → View pricing

Requires macOS 15 or later  ·  Apple Silicon  ·  Free trial included