A teacher’s assistant, not a student app

Every student gets your best day.

Feedback drafted from your own criteria, in your voice, and released only by you.

A student never has a TA39 account — everything they see arrives inside your LMS. It does not grade and it does not decide: no comment reaches a student unread, and nothing generative reaches one unless a teacher switches it on. For schools →

Maya S. · The Long Walk Homedraft 1 draft 2

As she wrote it

I got to four hundred before I stopped, because counting felt easier than thinking about what I would say.

What she added

I think it was that I already knew what she would say, and I did not want to be right.

Drafting the feedback is no longer the hard part. What a student does with it is.

Most tools can write a comment now. Almost none of them can show you whether it changed anything — which is the only question worth asking of feedback, and the one the rest of this page answers.

One assignment, six moments

Maya S. · The Long Walk Home · personal narrative · revision rounds onTwo loops run through it — hers and yours. Neither one closes on its own, and TA39 sits between them rather than in either one. Read the launch note

The Long Walk HomeConfirmed

The gravel crunched under my shoes like it was chewing on my thoughts. Every afternoon I took the same road past the water tower, and every afternoon I told myself today would be the day.

That day I counted my steps instead. I got to four hundred before I stopped, because counting felt easier than thinking about what I would say.

Maya chose one priority

I am going to say the thing I was avoiding. I think it was that I already knew what she would say.

MRMs. Rivera edited 1 comment, then released 2

Draft · not visible to students

Imagery · Criterion B

Strong opening image — the road “chewing on thoughts” earns the reader’s attention.

Reflection · Criterion C

You hint at avoidance here. Add one sentence telling us what you were afraid to say.

Added by Ms. Rivera

I know it is hard to write. It is also the heart of the piece.

How this draft changed

Asked: name what you were avoiding. Appears addressed. Still remains: why it was easier to count.

ConfirmAdjustLeave unreviewed

Your next move

5 of 16 showed the same gap. Ms. Rivera reteaches explanation, then sets a comparable task.

01Her loop

Maya turns in her draft.

Straight from Google Classroom or Canvas. You decided this piece was worth developing, so you opened it as a revision round.

02Your loop

TA39 drafts feedback from your rubric.

Comments land on the sentences that earned them, criterion by criterion. Nothing here is visible to Maya yet.

03Handoff · release

You edit it, then release it.

Saving is not releasing. Feedback becomes visible only when you decide it is ready — and the line you add is the one no software could write.

04Her loop

Maya chooses one thing to work on.

One manageable priority, in her own words. An honest “I am not sure” is a valid answer, and TA39 never writes the plan for her.

05Handoff · what changed

You read what changed.

Draft history keeps the submission, the feedback and the rubric results for every round. “How this draft changed” reads it criterion by criterion — what was asked, what appears addressed, what remains. Evidence that focuses your attention, not a verdict.

06Your loop

You decide what happens next.

Open another round, or post the grade from whichever draft is the one of record. 5 of 16 showed the same gap, which is a prompt for teaching rather than for grading.

You are the evaluator, not the acceptor.

TA39 draftsyou reviewyou decide

There is no fourth step where the software decides for you.

TA39 cannot know this student has been up since five with a new baby in the house. You can. Every comment passes your review before it goes anywhere — that is not a safeguard bolted onto the product, it is the reason the product is shaped this way.

The teacher remains the decision-maker.

Nothing is released, no grade is posted, and no criterion is changed without you. There is no setting that hands those away.

The student remains the thinker.

Maya rewrites her own sentence. TA39 will not draft it, finish it, or offer her a version to accept instead.

It runs where your assignments already are

Nothing to migrate, and a student never has a TA39 account. Create the assignment in Google Classroom or Canvas as usual; TA39 syncs it, works through the submissions, and hands them back to you — and everything a student sees arrives in the LMS they already use.

Open

You set the assignment

In Classroom or Canvas. TA39 picks it up with the rubric attached.

Queued

Drafts come in

Students submit where they always have. Nothing new to log in to.

Processing

Feedback is drafted

Criterion by criterion, against your descriptors.

Done

It waits for you

Nothing reaches a student until you have read it and released it.

Those four words are the only status vocabulary in the product. There is no dashboard to learn, and nothing in the sequence ends with a decision TA39 made.

Want to see what it writes, and what your student sees? Read the craft detail →

It reads your rubric, not a curriculum

There is no curriculum built into TA39 and nothing to adopt before you start. A rubric is the one thing it needs, and yours is the one it uses — if you do not have one written down yet, start from a sample and make it yours.

Four rubrics that look nothing like each other. Each one is read on its own terms.

Four criteria, level bands

An IB rubric, marked in bands. TA39 names the band and what the next one asks for.

A points scale

An AP-style scoring guide. The same reading, expressed in points rather than bands.

Three plain headings

Structure, language, effect. No levels at all — TA39 works from the wording you wrote.

Your own, on one page

Most teachers bring something closer to this than to any published framework.

Browse the teaching resources →

Where the boundaries are

The same list a teacher wants and a district reviewer needs. Stated as limits, because limits are what can be checked.

TA39 does

Reads your criteria

Drafts a comment per criterion

Shows what changed between drafts

Surfaces patterns across a class

Waits for you

Five things, in order. The last one is the one that matters.

TA39 does not

It does not assign a grade.You post it, from whichever draft you choose. TA39 holds no grade of its own.

It cannot send anything you have not read.Drafted feedback is invisible to students. Saving is not releasing.

It will not write, rewrite or finish a draft.It responds to what a student wrote. It does not produce writing on their behalf.

It cannot change your criteria.It will not add a criterion you did not set, or reword the ones you did.

It does not decide what a student knows.That is your judgment, and there is no configuration that transfers it.

It puts no generative AI in front of a student.Not unless you switch it on, one assignment at a time. See below.

Student-facing AI

Disabled by default. You turn it on for the assignments where it helps.

Optional, and enabled by the teacher or not at all. Where it is on, Maya can challenge the grade she was given and work out what a comment was asking of her — strictly on that, and it does not write for her. The conversation comes back to you: often the clearest look you get at where her thinking actually is. If your policy is no AI conversation with students, leave it off and nothing else changes.

ONGrade 12 · extended essay

OFFGrade 7 · personal narrative

Same teacher, same week. The switch belongs to the assignment.

What she can ask it

Why did I only get a 3 on reflection? I did say what I was avoiding.

Your criteria ask you to name the strategy and say why you chose it. Look at your third paragraph — the naming is there.

So I need to say why I avoided it, not just that I did.

That's the gap. The sentence is yours to write.The thread comes back to you. What this one told Ms. Rivera is on For teachers.

Reviewing on behalf of a school or district? The security documentation, data handling and configuration options are on the schools page.

What teachers ask first

Does it grade for me?: No. It drafts, you decide. A comment you do not confirm is never seen by anyone, and the grade is yours to post from whichever draft you choose. What TA39 produces is advisory until you act on it.
Will my students know it was AI?: The feedback is attributed to you, because you approved every line of it. No comment reaches a student that you have not read.
What if a student used AI to write the draft?: Revision rounds make that harder to hide. You see how the draft changed between rounds, and a student who cannot revise their own writing shows it quickly. TA39 never writes for the student — it responds to what they wrote.
Can we run it with nothing student-facing at all?: Yes. The only student-facing feature is a conversation about feedback you have already released, it is off by default, and you decide per assignment whether to turn it on. Assessment, review and released feedback do not depend on it.
What if I disagree with a comment?: Edit it or delete it. That is the ordinary case, not the exception — most teachers rewrite a few comments in the first assignment and fewer after that.

Teachers

Start with one assignment

Bring a rubric and a set of drafts you already have. We run the first round with you, and you judge it on what comes back.

Get in touch

Want the craft detail first? See how it works for teachers, or browse the teaching resources.

Schools

What IT needs, before anything is installed

What the software does and cannot do, where a teacher decides, and the security documentation a privacy review asks for.

Review security documentation