Some subjects are hostile to typing. Math with fractions, chemistry with structures, physics with free-body diagrams — the natural medium is a page.
Brainback lets you take a photo of your handwritten work and submit it as your attempt. The tutor uses Sonnet's vision capability to read the work and treats the image as first-class evidence.
Two guidelines: (1) write legibly enough that a human could read it; the model isn't infinitely tolerant of scrawl. (2) Include your reasoning steps, not just your final expression; the tutor uses the reasoning to shape its guiding question.
Available on all plans. Free tier has a per-day limit; paid tiers are unlimited.
bookmark this and come back after your first week