Rails 8.1 · v2.0

The AI layer of your SaaS, already built.

Auth, billing, admin and multi-tenancy — plus the parts that actually take the time: streaming chat over Turbo Streams, document Q&A on pgvector, and per-message credit metering that bills correctly.

Get the kit — $150 See it stream

One-time price 30-day refund Unlimited projects

your-app/

app/services/ ai_service.rb multi-provider chat document_processor.rb chunk + embed payment_provider.rb stripe | paystack app/models/ ai_conversation.rb ai_message.rb document.rb document_chunk.rb ← pgvector account.rb account_user.rb tenancy app/jobs/ ai_chat_stream_job.rb token streaming process_document_job.rb app/controllers/admin/ 18 controllers users, revenue, AI spend

68 migrations, all reversible

187 tests, green on main

19 transactional emails

3 LLM providers, one interface

Positioning

Why not Jumpstart or Bullet Train?

Use them if you want the mature option. Both are older, have bigger communities, and cover more general SaaS ground. This kit exists for a narrower reason.

The AI layer is the product

Streaming chat, RAG over your documents, credit metering and per-message cost tracking are working code — not scaffolding you finish yourself.

Payments beyond Stripe

Stripe and Paystack behind one facade, with geo-detected currency. Adding a second processor later is usually a rewrite.

Smaller surface area

Fewer abstractions between you and Rails. A real trade-off: less is done for you, and less is in your way.

Said plainly: ruby_llm already gives you a chat call in a few lines. What takes the time is everything around it — streaming it to the browser without an SPA, metering it, storing it, rendering it, and billing for it correctly.

Live demo

This is the actual chat component.

Token-by-token over Turbo Streams — no SPA, no websocket plumbing of your own. What you're watching is what your users get.

✓Streams from OpenAI, Claude or Gemini

✓Markdown with syntax-highlighted code

✓Credits metered per message

AI Chat streaming live

Specification

Everything in the box

No roadmap items, no "coming soon". If it's listed here it's in the repository.

AI
Chat	Streaming responses, conversation history, pinning, auto-titles	ruby_llm
Providers	OpenAI, Anthropic, Gemini, Mistral, local Ollama	one interface
RAG	PDF/DOCX/TXT ingest, 500-word chunks, cosine search	pgvector
Metering	Per-message token counting and credit deduction
Tools	10 fill-in-the-blank prompt templates
Commerce
Providers	Stripe and Paystack behind one facade	PaymentProvider
Currency	Geo-detected, multi-currency pricing
Billing	Subscriptions, credit packs, webhook lifecycle
Documents	Branded PDF invoices and receipts
Platform
Auth	Devise, confirmable, OmniAuth (Google, GitHub)
Tenancy	Personal and team workspaces, roles, invites	acts_as_tenant
Admin	18 controllers: users, revenue, AI spend, impersonation
Growth	Referrals, promos, drip campaigns, public roadmap
Jobs	Sidekiq with cron scheduling
Mobile	Hotwire Native Android shell	wrapper
Deploy	Kamal 2 config, Docker, CI workflow

Surfaces

The screens you'd have built anyway

AI / Streaming

One interface. Every model.

Switch providers with a flag. Streaming, token counting and credit deduction are already wired through Turbo Streams.

✓Conversation history & pinning

✓Auto-generated titles

✓Per-message cost tracking

app/services/ai_service.rb
service.chat(conversation, msg) do |chunk|
  # streamed to the browser live
  broadcast(chunk.content)
end

# switch models per conversation
conversation.update!(model_id: "claude-sonnet-4")

Documents / RAG

Chat with any document.

Upload a PDF, DOCX or text file. Chunking, embeddings and semantic search run in a background job — then ask it questions.

✓500-word chunks with overlap

✓Cosine similarity via pgvector

✓Answers grounded in your files

/documents

quarterly-report.pdf 42 chunks

→ What's the CAC in year two?

Year-two CAC is projected at $38, down from $52 — driven by referral loops (p. 14)

Payments

Get paid anywhere.

Stripe and Paystack behind one facade — geo-detected currency, webhooks, subscription lifecycle and PDF invoices.

✓Switch providers with one env var

✓Credit packs + subscriptions

✓Branded invoices & receipts

/admin/payments

USD	$99.00	Stripe
EUR	€89.00	Stripe
NGN	₦150,000	Paystack
GBP	£79.00	Stripe

Admin & Growth

A real back office.

Users with impersonation, revenue and AI-cost analytics, campaigns, promos, referrals and a public roadmap.

✓AI spend vs revenue dashboard

✓Segmented email campaigns

✓Roadmap with public voting

/admin/dashboard

MRR

$4,280

AI spend

$312

Active

184

Churn

2.1%

Teams / Mobile

Multi-tenant. Multi-device.

Personal and team workspaces on acts_as_tenant with roles and invites, plus a Hotwire Native Android shell.

✓Workspace switching built in

✓Owner / admin / member roles

✓Android shell included

workspace switcher

A Acme Inc. 4 members

P Personal workspace personal

Setup

From clone to deployed

Clone

git clone, then bin/setup. Gems, database and seeds are handled.

Configure

Copy .env.example to .env and add your keys. First signup becomes super admin.

Deploy

kamal deploy to any VPS — or Hatchbox, Railway, Render, Fly.

~/my-saas — zsh
$git clone saaskit my-app
Cloning into 'my-app'... ✓ 412 files
$bin/setup && bin/dev
✓ Gems installed · DB migrated · seeds loaded
✓ Running on http://localhost:3000
$kamal deploy
✓ Live at https://my-app.fly.dev

Status

Where this is right now

The kit is new. There's no wall of testimonials because there aren't enough customers yet to fill one honestly — so here's the actual state of things.

Maintained by one developer

Built in the open, not by a team.

Everything on this page is real

The chat demo above is the shipped component, not a video.

The Android app is a wrapper

Hotwire Native shell around the web app — not a native client.

Push notifications need work

The FCM path targets Google's retired legacy API. Documented, being fixed.

30-day refund, no questions

If it doesn't fit your project, say so and you get your money back.

Pricing

One price. Yours forever.

Buy once, build unlimited projects. No subscription.

1 Year Updates

$150 once

One year of updates. Yours forever.

✓Full source code
✓Unlimited projects
✓1 year of updates
✓Email support

Get started

Questions

Still stuck?

Email me directly — you'll get a reply from a person.

support@saasrailkit.com

OpenAI (GPT-4o, o1), Anthropic (Claude), Google (Gemini), Mistral, local Ollama. Swap with one flag — the abstraction is ruby_llm.

They're more mature and cover more general SaaS ground. This goes deeper on the AI layer — streaming chat, RAG, credit metering — and ships a second payment provider. If you don't need those, use theirs.

Yes. It's a starter, not a no-code tool. If you've shipped a Rails app before, you'll be productive in a day.

Kamal 2 config is included. Any VPS, Fly.io, Hatchbox, Render or Heroku. Postgres + Redis + Sidekiq is all you need.

New features land on the main branch; you git pull or merge. 1-year gets 12 months, 5-year gets five years, lifetime gets them forever.

30-day no-questions-asked refund. Email me and I refund you.

Yes. Unlimited projects — your own SaaS, client work, internal tools.

Start with the boring parts already done.

Get the kit — $150

Or get an email when something ships You're on the list.