Writing: Through-Line
See the shape of your thinking.
A student watches a short video and rebuilds it in their own words. Through-Line shows whether that writing holds a single through-line — how it moves through meaning, where it is grounded and where it is hollow — and gives that back as feedback. The student keeps doing the thinking; the instrument makes its shape visible so a teacher can teach into it.
What it shows
Every layer is a measurement, never a verdict. What it means for a particular writer is a question for a human — never the machine.
- The Line — how an idea moves through meaning: where it walks steadily, and where it leaps.
- The Structure — how sentences are built: their variety, depth, and rhythm.
- The Words — the range and texture of vocabulary across the passage.
- The Core — whether the writing is both grounded in real content and holds together — catching when it is hollow or scattered.
Built around your curriculum
Start in minutes with five ready-made video assignments across five levels of difficulty — or build your own from any video and its transcript. You set what counts as a leap for each age and level; the instrument just measures.
A second lane, not an oracle
Through-Line doesn't answer, draft, or shortcut. It reflects the structure of what the student already wrote and feeds it back, so the practice — and the thinking — stay theirs, with AI in the supporting lane.
Read by a Coevolution Coach
The instrument deliberately withholds the part a good teacher provides: the judgement of what a learner needs next. That is the work of a certified, named Coevolution Coach who reads the diagnostics and does the teaching. Coaches are never anonymous — every coach is a real, verifiable person. Nothing is recorded as a grade.