Twiddla
twiddla.comAnnotate webpages and images together on a browser whiteboard.
Annotate webpages and images together on a browser whiteboard.
Combine technical vectors, dimensions and raster reference in one drawing
A digital whiteboard for building lessons, recording explanations, and collaborating with students.
An open-source desktop notebook for stylus handwriting, PDF markup, layers, and audio notes.
Draw and annotate live with a student inside a virtual tutoring lesson.
Sketch and review 3D forms in immersive shared workspaces
Draw together on a free whiteboard for lessons, files, and shared notes.
Read and annotate PDFs with a multi-format viewer
Edit and convert PDFs with a small monthly free export allowance
Create annotated screenshots and consistent visual process guides.
Frame app screenshots and prepare captions in several languages.
Keep captured visual references floating beside the work you are editing.
Analyze text collections quantitatively
Search text interactively with reusable patterns
Apply repeatable edits across text files
Review text differences and resolve merge conflicts
Apply chosen rules to Markdown and plain text
Keep rich-text or code notes in a hierarchical tree stored in a single database or file collection.
Edit Markdown notes and todo.txt lists in a lightweight Android text editor.
Edit code with a fast desktop editor whose multiple selections can apply the same change in several places.
A terminal code editor built around selecting text first and applying editing commands to it.
Extract PDF text with page, layout, and coordinate controls
Build repeatable text transformation pipelines
Convert ASCII letters into Unicode styles