SaaS boilerplates & starter kits
Substrat
A runtime-enforced substrate for building vertical B2B SaaS
- 0community votes
- 0DR by Ahrefs no change since last check
Ahrefs Domain Rating listed 6 Nov 2026, relisted 2 Nov 2026.
A hosted multi-tenant platform for building vertical B2B SaaS applications with built-in permissions, audit, and GDPR enforcement below the API surface.
What it is
Substrat: the homepage
Substrat is a hosted substrate that provides runtime-enforced guarantees for vertical B2B SaaS. It provides multi-tenancy, permissions, audit logging, and GDPR compliance enforced below the API surface, so the safety of the system doesn't depend on who wrote the code above it.
The platform includes a system of headless, versioned domain engines (work orders, invoicing, bookings, protocols, invites, absence, metering, notifications, and assistant) that own critical invariants. These engines are built as npm packages with no UI, no HTTP server, and no storage beyond their own tables. Verticals compose these engines and add domain-specific logic, vocabulary, screens, and workflows.
The architecture enforces isolation through a star topology where engines never import or call each other, instead communicating through kernel-mediated channels like opaque references, events, and vertical-owned orchestration. This keeps every engine independently versionable, licensable, and replaceable.
Developers can use Substrat with or without AI agents. The system is designed for agent compatibility with its small typed surface, mechanical pushback, and self-describing manifests—a design that also makes it legible to humans. The whole stack can run on a pure-SQLite adapter with no platform in the loop.
Listed capabilities
- Work order engine with state machine and append-only reporting
- Invoicing engine with immutable export basis
- Booking engine with capacity allocation and double-booking prevention
- Protocol/checklist engine with sign and immutability
- Absence ledger engine with append-only balance tracking
- Metering engine for billable usage tracking
- Single-use invite engine with secure identifier handling
- Runtime enforcement of permissions and isolation
- GDPR compliance enforced at runtime
- Pull request previews with production scope forking
Follow Substrat for an email about each milestone, update and new product they post, in a daily summary.
Substrat metrics
| Metric | Value |
|---|---|
| Domain Rating | 0 no change since last check |
| Trust Flow | 0 no change since last check |
| Citation Flow | 22 no change since last check |
| Referring domains | 2 no change since last check |
| External backlinks | 25 no change since last check |
Ahrefs Domain Rating listed 6 Nov 2026, relisted 2 Nov 2026. Majestic listed 2 Nov 2026, relisted 2 Nov 2026. Link data listed by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
Substrat domain listing data
Show the listing data
| Domain age | 3 months |
|---|---|
| Registered | |
| Expires | |
| Registrar | Gandi SAS |
| DNSSEC | Not signed |
Substrat launch receipt entry
| Measure | At launch, then latest |
|---|---|
| Domain Rating (Ahrefs) | 0 to 0 no change since launch 2 Nov 2026, then 5 Nov 2026 |
| Trust Flow (Majestic) | 0 first measured 2 Nov 2026 |
| Referring domains (Majestic) | 2 first measured 2 Nov 2026 |
Day 3 since launch. Next receipt: day 30, 2 Dec 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
Before you launch
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Quick answers
What is Substrat in one sentence?
Substrat is a hosted substrate for vertical B2B SaaS that enforces multi-tenancy, permissions, audit, and GDPR compliance below the API surface, so it stops mattering who or what wrote the code above them.
How is Substrat different from a framework like Rails or Wasp?
A framework gives conventions that erode with edits; Substrat gives runtime guarantees. The API for reaching a scope is the isolation mechanism, so there is no way to return another tenant's data with the wrong flag set, unlike frameworks where isolation depends on developer discipline.
How is Substrat different from Supabase?
Supabase enforces at runtime but relies on row-level-security policies you must write correctly—precisely what inexperienced builders and LLMs misconfigure most. Substrat's isolation is not a policy you author; it is also vertical-SaaS-shaped with nested tenancy, a module system, and domain engines.
Do I own the code?
Yes, and it runs without Substrat. The whole stack boots on the pure-SQLite adapter with no platform in the loop. Contracts and the build surface are Apache-2.0; the runtime is AGPL plus commercial, with escrow. The licenses mean copyleft and inspectable, not permissive MIT licensing.
What is an engine?
An engine is a headless, versioned package that owns a critical invariant like a state machine that can't skip states, an append-only ledger, or an invoice immutable after export. You extend it by composition: call its in-scope functions inside your own operation in your own transaction with your own permission check.
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