Locked Assignment Windows Inside the LMS: startup idea with real demand
Teachers put access codes on Canvas assignments to stop AI/Google cheating, then angry parents demand the codes be sent home. The system gets gamed from both sides.
r/Teachers · Sep 14, 2026 – Oct 14, 2026 · 855 upvotes
Why does your assignment have an access code on
Read the thread · 136 comments
Locked Assignment Windows Inside the LMS is a startup idea for teachers and schools. Teachers put access codes on Canvas assignments to stop AI/Google cheating, then angry parents demand the codes be sent home. The system gets gamed from both sides. A thread in r/Teachers drew 855 upvotes and 136 comments between Sep 14, 2026 – Oct 14, 2026. People get by with Canvas access codes, Respondus LockDown Browser, and GoGuardian, and that still leaves this job open. Hotness is 3.75, Hot. Strong pain. Some willingness to pay. The thread drew 855 upvotes and 136 comments. Gaps in existing tools. Needs integrations or data deals. A first version is a hard build, about 5+ weeks, priced between $50 and $199 a month and charged as a B2B subscription. The pain, the source, the alternatives, the scope notes, and the questions on this page are free to read and free to build from. The agent starter prompt is the paid part. The first slice is on the page. One credit unlocks the rest, to paste into a coding agent, download as Markdown, or send as a private link.
Verbatim quotes are added only after a manual check. Until then, the thread title is the excerpt. Exact post date and verbatim quotes pending enrichment.
Who has it
Teachers and schools.
What people use now
- Canvas access codes
- Respondus LockDown Browser
- GoGuardian
A way through
An assignment layer that creates a verifiable closed completion window (local timer, tab/device control) inside existing LMSs instead of homemade access codes.
MVP scope
- Give teachers and schools a way to do this in one sitting: Verifiable in-class 'closed windows' for assignments, built into Canvas, instead of hacky access codes.
- Persist the result and show it again after a reload.
- State the empty case when there is nothing to show yet, with one next step.
- Charge later with a B2B subscription, between $50 and $199 a month. The free path must finish the core job once.
- Ship the browser extension only. Leave Canvas access codes to keep the jobs they already do well.
How it could charge
B2B SaaS · $50–199 a month · B2B · US.
Hotness 3.75
4 of 5, Hot. Strong pain. Some willingness to pay. The thread drew 855 upvotes and 136 comments. Gaps in existing tools. Needs integrations or data deals.
Why this score
| Pain | 4 / 5 |
| Willingness to pay | 3 / 5 |
| Demand | 5 / 5 |
| Competition gap | 3 / 5 |
| Ease of build | 2 / 5 |
| Recency | 5 / 5 |
Weights: pain 25%, willingness to pay 20%, demand 20%, gap 15%, ease 10%, recency 10%. Recency is recomputed every build. The source report’s 1–10 score is not shown.
Questions
Is this idea already taken?
People already use Canvas access codes, Respondus LockDown Browser, GoGuardian. Those options do not do the job in the solution above. The idea is free to build. Nothing here is an exclusive claim.
How hard is a first version?
Hard. A tight MVP is about 5 weeks (5+ weeks), assuming the regulated or partner-gated parts are stubbed. The paid prompt turns that into tasks.
Who would pay, and how?
The audience is teachers and schools. Charge a B2B subscription, and test a price between $50 and $199 a month. Willingness to pay is one input to Hotness, not a promise that someone will buy.
Can I use the evidence?
Yes. Build the product. The thread title is a short excerpt with a link, not a quote we are putting in someone's mouth. Exact post dates and verbatim lines are added only after a manual check. Ideas are suggestions, not medical, legal, or financial advice.
Agent prompt
The first slice is public. The rest is fetched only after you unlock it, and it is not in this page’s HTML.
# Agent starter prompt: Locked Assignment Windows Inside the LMS You are a senior product engineer. Build only the product described in this document. If a detail is missing, choose the smallest option and write it down in the README. Do not invent a second product, a marketplace of marketplaces, or a growth hack. ## Product Name: Locked Assignment Windows Inside the LMS One line: Verifiable in-class 'closed windows' for assignments, built into Canvas, instead of hacky access codes. Shape: Browser extension AI stance: AI-assisted Region for v1: United States Hotness (context only, not a requirement): 3.75 (hot). Strong pain; some willingness to pay; thread engagement 855▲/136💬 (demand 5/5); gaps in existing tools; needs integrations or data deals. ## Problem Teachers put access codes on Canvas assignments to stop AI/Google cheating, then angry parents demand the codes be sent home. The system gets gamed from both sides. Who feels it: Teachers and schools.
Unlock the rest with 1 credit.
The sister site has the plan and the first month of distribution, with no account. Draft the business plan
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