How to start a Teacher-Controlled Blocklist for Viral Game Sites business: plan and growth
A teacher is ready to go back to paper just to stop students playing Snow Rider 3D on school laptops. GoGuardian can't keep up with new mirror sites.
An owner can start “Teacher-Controlled Blocklist for Viral Game Sites” from a complaint people already posted. The offer, in one line: Teachers switch on a community-updated blocklist per class, without waiting on district IT. It is for teachers and schools. Charge a free tier and a paid upgrade, and test a price between $10 and $49 a month. Begin in the United States. Buyers already talk about this in r/Teachers. One thread gathered 958 votes and 239 replies across Sep 14, 2026 – Oct 14, 2026. Use that room to meet the first twenty buyers. Do not export it, and do not republish the posts. The idea, the evidence, and the market estimate on this page are free to read. Two paid prompts finish the job: one drafts the offer, the price, and a ninety-day calendar; the other drafts a month of conversations and proof. One credit unlocks both. A software specification is not on this site. When the company is the product itself, a single link further down opens the founder library.
So sick of Snow Rider 3Dr/Teachers · Sep 14, 2026 – Oct 14, 2026 · 958 votes · 239 replies · Open the thread
Who would pay
Teachers and schools. Start in the United States, and charge a free tier and a paid upgrade, testing a price between $10 and $49 a month.
The thread above is the public complaint this business can learn from. Verbatim quotes are not invented. Further sources, when a later report adds them, stay with the evidence.
What buyers use today
- GoGuardian
- Securly
- District firewalls
The offer, in our words
A lightweight tool the teacher turns on per lesson, with a fast community-updated blocklist of specific viral distraction sites, independent of central IT.
Score 3.85, Hot. Pain, willingness to pay, demand, and the gap in current options drive it. We are not scoring how fast you can code.
Market size
An estimate, built from the bottom up: real customer counts × a realistic price. It shows the size of the prize, not a forecast.
TAM Total addressable
$36M a year
1.5M teachers · 40% of US public school teachers
SAM Serviceable
$10.8M a year
450,000 teachers · schools that let teachers add tools
SOM Obtainable in 3 years
$163K a year
6,800 teachers · 1.5% of the reachable segment in three years
What that means
6,800 teachers at $2/mo = $163K ARR
Low confidence · estimated Oct 2026
How we estimated this
- Base: 3,760,000 US public school teachers.
- Has the problem: 40% (assume 40% fight game sites in class).
- Revenue per teacher: $24 per year ($24 per teacher a year).
- Reachable: 30% (schools that let teachers add tools).
- Three-year capture: 1.5% of the reachable segment.
TAM is customers with the problem × revenue per customer. SAM is the part a new business can reach. SOM is a cautious three-year share of SAM. The bars use a log scale. A share marked “assume” is our judgment, not a measurement.
Source: NCES, Characteristics of Public School Teachers (2020–21)
The business-plan prompt
The offer, the price, and a ninety-day calendar, written for an agent. 1 credit unlocks both prompts for this idea: this plan and the growth playbook below.
# Business plan prompt: Teacher-Controlled Blocklist for Viral Game Sites You are writing a practical plan for one owner who will sell this as a business. Do not write a software specification, a venture memo, or a feature list. Use short sentences. Where a number is unknown, give a range and say what to measure. ## The business Working name: Teacher-Controlled Blocklist for Viral Game Sites What the customer gets: Teachers switch on a community-updated blocklist per class, without waiting on district IT. Who pays: Teachers and schools
Locked · the first lines are above
Unlock both prompts for this idea · 1 credit ($9.99)
One credit opens the business plan and the growth playbook together, for good. Credits work on both businessideastobuild.com and realstartupideas.com.
Sign in once with your Real Startup Ideas account; the same credits work on both sites.
The growth playbook
Thirty weekdays of conversations and proof. Not an ad plan. Included with the plan above, on the same credit.
# Growth prompt: Teacher-Controlled Blocklist for Viral Game Sites You are planning thirty days of distribution for a business that already has an offer. The offer: Teachers switch on a community-updated blocklist per class, without waiting on district IT. The buyer: teachers and schools. Price band: between $10 and $49 a month. Do not propose ads, a viral loop, or a rebrand. Propose conversations, proof, and a repeatable weekly rhythm. ## Starting point A public thread in r/Teachers drew 958 votes and 239 replies. The pain, in the owner's words: A teacher is ready to go back to paper just to stop students playing Snow Rider 3D on school laptops. GoGuardian can't keep up with new mirror sites.
Locked · the first lines are above
Unlock both prompts for this idea · 1 credit ($9.99)
One credit opens the business plan and the growth playbook together, for good. Credits work on both businessideastobuild.com and realstartupideas.com.
Sign in once with your Real Startup Ideas account; the same credits work on both sites.
Questions
How much money do I need to start?
Enough to talk to buyers and deliver the offer once. A service version can start with a written process and a way to take payment. A software version is a larger bet and is not required to test the price. The band to test is $10–49 a month.
How should I price it?
Test a price between $10 and $49 a month, charged as a free tier and a paid upgrade. Raise it after three paid pilots, not before the first conversation.
Where do the first customers come from?
r/Teachers is the clue. A related thread gathered 958 votes and 239 replies. Show up there, follow the room's rules, and ask for conversations. Do not scrape it.
Do I need to write code?
No. The prompts on this page draft a plan and a month of growth. Code is a later choice. The founder site linked once below is where the build document lives, if you want it.
A separate site sells the agent build document and can build the product. PRD and build options
A two-week build starts at $10,000 on that site, after a $1,000 scoping fee.
Plans and growth playbooks
One credit opens both prompts for this business.
The idea, the evidence, and the market estimate stay free. The business plan and the thirty-day growth playbook for Teacher-Controlled Blocklist for Viral Game Sites cost one credit, together, and stay unlocked.
Credits work on both businessideastobuild.com and realstartupideas.com. Sign in once with your Real Startup Ideas account; it is the same wallet.