Case Study: RentGuard — a Plain-English California Tenant-Rights Checker
RentGuard was a free, plain-English checker for California renters, published on Alumniyat.com — our former product lab, now part of Webmaster & More. It answered three concrete questions: Is my rent increase legal under AB 1482? Is my security deposit within AB 12’s limits? Does my eviction notice meet just-cause requirements? No login, and nothing you typed was stored.
Why these three questions
California tenant law changed meaningfully in recent years — AB 1482 capped many rent increases, and AB 12 limited most security deposits to one month’s rent. But the laws are written for lawyers, and a renter holding a rent-increase letter needs a yes/no answer with the math shown. Each check was small, specific, and verifiable against the statute — which is what made the tool trustworthy.
How it was built
A single static page, vanilla JavaScript, all logic client-side. The rent-increase check implemented AB 1482’s actual formula (5% plus regional CPI, capped at 10%) rather than paraphrasing it. Because nothing left the browser, the privacy story was simple and true: we couldn’t see your answers even if we wanted to.
What we learned
Narrow tools earn trust faster than broad ones. RentGuard didn’t try to be “everything tenant law.” Three precise checks, each with the statute cited, read as more credible than an encyclopedia.
Plain English is a feature, not a dumbing-down. Translating “lowest gross rental rate charged… plus the percentage change in the cost of living” into an interactive form with the numbers filled in is genuinely hard editorial work. It’s also the entire value of the product.
The same lesson as our other lab tools: without a distribution channel, even a useful free tool stays invisible. Tenant-rights nonprofits and legal-aid groups would have been the natural partners — the audience already exists; the tool has to go where it is.
For nonprofits and legal practices
Self-help checkers like RentGuard are a natural fit for legal-aid nonprofits, tenant organizations, and landlord-tenant practices: they serve people at scale, filter matters that need a human, and demonstrate expertise concretely. We build them as custom, dependency-free tools that your team can keep for years.
If that would serve your audience, book a free consultation.
Frequently asked questions
What happened to RentGuard?
Alumniyat Tools was folded into Webmaster & More in July 2026; RentGuard was retired and its address now points here.
Was it legal advice?
No — informational checks with citations, and clear pointers to legal aid for real disputes.
Could it be revived for an organization?
Yes — the design and data model are reusable, and we can rebuild or adapt it for a legal-aid group or firm.