v3 Early Preview

Free Online Document Camera & Visualizer App for Teachers

Turn any webcam or phone into a classroom visualizer. Freeze frames, annotate, compare, pin resources and present using a web browser. No install, no hardware lock-in, and reload saved lesson captures in seconds.

Version 3 (v3) is the newest version and is labelled Early Preview while undergoing development.

Open v3 app Early Preview Open v2 app Classic app

Camera processing stays on your device. The core app is free with no account required. Built to supplement, not replace, your teaching.

Any camera
No install
Local camera processing
Freeze and annotate
Wireless phone camera support

Choose your version

VisualizerApp v3 is the latest version in Early Preview. VisualizerApp v2 is the current stable version. v3 and v2 each have a free version and an optional paid Pro upgrade; Classic remains available as the legacy option.

VisualizerApp v3 Early Preview

The newest version, built around classroom workflows.

  • New cleaner toolbars grouped into easier menus.
  • Improved Shape, Measuring, Science, and grid tools.
  • New classroom engagement features including picker, spinner, tally, QR, reveal, and sound meter.
  • New Lesson Decks and pinned resources for saving and reloading teaching moments quickly.
  • Celebration and Birthday Modes with sound.
Launch v3 app Early Preview

Try the newest features, shape v3 by using the feedback form.

VisualizerApp v2 Stable

The recommended version for everyday classroom use.

  • Live camera, freeze, annotation, split view, timer, and resources pane
  • Wireless phone camera support
  • Presenter Mode and classroom workflow tools with Pro
  • Video capture and looped recording
  • Use this if you need the most reliable version
Launch v2 app

v2 will continue while v3 is in development.

Classic VisualizerApp Legacy

The original simpler interface, kept available for anyone who prefers it.

  • Webcam document camera
  • Freeze, annotate, and save
  • Basic image controls
Open classic app (Legacy)

Useful for older workflows or very simple setups.

What it does

VisualizerApp v3 is a document camera with classroom tools for live modelling, feedback, and lesson evidence.

Document Camera Mode

Use a webcam or phone camera as a live visualizer for books, worksheets, worked examples, and demos.

Freeze, Annotate & Save

Freeze live modelling or exemplar work, annotate each step, then capture it for lesson notes and evidence.

Split View Comparison

Compare a live draft with a frozen exemplar, answer reveal, or previous step.

Grid, Science & Measuring Tools

v3 adds a cleaner Grid with size controls, Science Tools, and Measuring Tools for ruler, line, protractor, compass, angle, and set square overlays.

Designed for Classrooms & Demos

Built for quick teacher-led use: open the app, allow the camera, and start presenting without vendor software.

Presenter Mode (Pro)

Pro adds a clean projector window, scene switching, student work layouts, and labelled exports for whole-class feedback.

Lesson Decks (Pro)

Save frames, tag captures, make notes, pin resources and overlays so feedback moments can be kept or reused for future lessons.

Engagement Features

Use picker, spinner, tally, QR, reveal, and sound meter tools for quick choices, formative checks, and classroom focus.

Dual Camera & Overlays

Use dual camera support with PiP (Picture in Picture) and comparison overlays to show another view, compare live work, or place a reference over the live feed.

Document Camera Guides & Resources

Document Camera for Teachers

Practical classroom setups, camera choices, freeze frames, annotation, and student work capture.

Document Camera for Chromebook

What works well on ChromeOS, how to improve camera angle, and what to check for school rollout.

Use Your Phone as a Doc Cam

Use a phone camera when you need better focus, a closer view, or a quick movable camera.

Free Document Camera Software

What the free app includes, what Pro adds, and when a simpler camera viewer is enough.

Online Document Camera

How browser-based camera processing works, what stays local, and what still needs internet.

Document Camera Alternatives

A balanced look at webcams, phones, browser software, and dedicated document cameras.

Found an issue in v3? Please use the feedback form.

VisualizerApp is a small one-person project based in the UK. It was built with the help of modern AI tools, but shaped, tested, and maintained by a real person. The core app is free to use, with optional low-cost subscription and annual licences to help support hosting, updates, future features, and the time spent putting it together.

FAQ

Yes. VisualizerApp turns any webcam into a full-featured document camera with freeze, annotate, split view, overlays, and capture tools. Try the v3 app Early Preview for the newest features, or use the v2 app for everyday teaching.

Use the v3 Early Preview to try the newest interface, extra features, and improvements. Version 3 has better tools for saving and exporting lesson activity, along with fun modes like Tally Mode, Spinner, and Birthday Mode. Use v2 when you need the most reliable version.

Yes. The core app is free with no login required; optional paid Pro upgrades add extra tools. Camera processing is local in your browser – camera video isn’t uploaded to a server. Optional services (analytics, Pro activation, textbook search, wireless pairing) are disclosed and only run when needed and with your consent.

Yes. Freeze a pupil's work under the camera, tag it, discuss it with the class, and reopen it next lesson. For core use, camera video and captured pupil work stay on your device and are not uploaded to VisualizerApp servers.

Zoom, rotate, brightness, contrast, keystone correction, flip, and sharpness settings. You can also switch to high contrast, greyscale, or inverted modes, and add a vignette or spotlight to focus attention (V = vignette, S = spotlight).

VisualizerApp is an independent project operated by INLine Computers. The goal is to build a reliable, high-quality document camera tool that’s useful for teachers, students, and anyone running demos. See the about page for more information.