Sitr | سِتْر
a content filter that is private by construction
est. 2026 · dooplin apps · mozilla public license 2.0

Sitr for Institutions · schools · masajid · ISPs · fleets

A filtering policy you can defend with documents,
not assurances.

When parents, boards or subscribers ask what your filter does with browsing data, “the vendor says it’s fine” is a weak answer. “Here is the public architecture, the empty endpoints table, and the checksums — verify them” is a strong one. That’s what you deploy with Sitr.

0 user browsing data collected — at any scale 1 public blocklist, appeals included 100% of the code auditable before you sign
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Who deploys Sitr

The product is the same auditable filter families install at home. What institutions buy is everything around it: deployment, support, licensing and someone accountable on the phone.

I.1

Islamic schools & madaris

Deploy Sitr across labs, library machines and take-home devices via your MDM. Students get filtering that provably doesn’t log them — a policy you can defend to parents with documents, not assurances.

I.2

Masajid & community centers

Public Wi-Fi and shared computers stay clean without routing your congregation’s traffic through a third-party logger. Set it up once; the fail-visible badge tells volunteers at a glance that protection is on.

I.3

Halal ISPs & network operators

Offer family filtering as a differentiator without becoming a surveillance vendor. License the maintained, appeals-backed blocklist feed and ship “powered by Sitr” — the brand your subscribers can audit.

I.4

Fleets & managed devices

Enterprise policy templates for Chrome/Edge, deployment runbooks, and a support contract with real humans. Your IT team gets configuration authority; your users still get the empty endpoints table.

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What's on offer

The code is MPL-2.0 and free at any scale — you could deploy tomorrow without talking to us. These are the things forks can't give you.

OfferingIncludesModel
Deployment support MDM/Group Policy rollout, configuration review, staff training Contract
Support agreement Named contact, response-time SLA, upgrade guidance Annual
Blocklist feed license The maintained CC BY-SA list as a commercial feed, with attribution terms License
White-label / “powered by Sitr” Trademark license for ISPs and router vendors shipping Sitr filtering License

Plans, plainly

PlanDevicesPriceAdditional devices
Starter up to 150 $300/yr $1.50/device/yr
Standard up to 300 $500/yr $1.00/device/yr
Large / ISP / white-label 1,000+ custom quoted per engagement

// Both tiers include the support SLA; deployment help, blocklist feed and white-label licenses priced separately. Device counts are contractual — self-declared at signup, trued up at renewal. We can't meter them: your deployment never touches our servers, and that's the product. Billed annually by invoice (bank transfer).

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Why an institution can sign this

Your diligence is already done, in public: the threat model, data-flow inventory and inclusion policy are documents you can attach to a board proposal today.

And because filtering is on-device, adopting Sitr never puts you in the position of operating — or answering for — a log of your students', congregants' or subscribers' browsing.

Blocklist disputes don't route through your front office. Anyone affected can use the public appeals process directly, and every decision is reviewed against published criteria — governance you inherit instead of invent.

support@sitrshield.com · tell us who you serve and on what platforms — we'll reply with a deployment sketch and a quote.