Notifycal is a SaaS platform that helps appointment-based businesses reduce no-shows through automated SMS reminders — synced directly with the calendar tools they already use.

Small and medium-sized businesses that rely on appointments — clinics, salons, consultants — share a common pain:

• Customers forget appointments
• No-shows directly impact revenue
• Manual reminders are time-consuming and unreliable

Existing solutions are too complex, overpriced, or not adapted to SMB workflows.

• Syncs with Google Calendar — connects to the calendar you already use
• Sends automated SMS reminders — before appointments, on your schedule
• Configurable timing and messaging — adapt to your business needs
• Subscription + usage-based billing — predictable costs with top-up flexibility
• Usage visibility — clear tracking of reminders sent and costs

Connect your calendar → configure reminders → reduce no-shows automatically

Monthly subscription includes a base number of SMS reminders. Additional usage is covered via top-ups. Pricing is simple and predictable for SMBs, with internal balance tracking (in €) to handle varying SMS costs per country. Pricing configurable.

→ Full System Architecture

→ Stripe & Billing

Notifycal is a modern, serverless SaaS platform built with scalability, reliability, and cost-efficiency as core principles, following a modular and event-driven architecture.

The platform has two complementary frontend layers — the SaaS application and a static landing site — sharing UI primitives and design decisions.

SaaS Application — single-page application (SPA):

• React + TypeScript · Vite · TanStack Router (file-based, type-safe) · TanStack Query
• Mantine + Tailwind CSS · Framer Motion · i18next · Axios (with interceptors)

Static Landing — built with Astro, optimized for performance and SEO:

• Astro (static generation) · partial hydration for interactive islands
• React components reused from the SaaS application

Shared UI Layer — single source of truth across both surfaces:

• Reusable React components · shared TypeScript types · shared Zod validation schemas

Fully serverless, designed for horizontal scalability and minimal operational overhead:

• AWS Lambda (Node.js + TypeScript) · API Gateway (REST) · DynamoDB
• SQS / SNS for async processing · Zod for runtime validation · OpenAPI contract definition

Background processes (reminders, retries, notifications) are handled asynchronously through queues — decoupled and resilient by design.

• OpenTofu / Terraform (via Terragrunt) · GitHub Actions (CI/CD) · Cloudflare (DNS + edge)
• AWS X-Ray for distributed tracing · AWS Lambda Powertools (Logger, Tracer, Metrics)

• Vonage — SMS delivery
• Mailgun — email notifications
• Stripe — billing and subscriptions
• Google OAuth — authentication

• Serverless-first — automatic scaling, minimal operational overhead
• Event-driven — decoupled and resilient background processing
• Type-safe end-to-end — shared contracts across frontend and backend
• Cost-aware — optimized for early-stage efficiency
• Modular & extensible — easy to evolve and integrate new providers

• AI agent for creating appointments to close the loop
• Microsoft 365 / Outlook Calendar integration
• Improved onboarding and self-serve experience
• No-show analytics and ROI reporting
• International expansion with localized pricing

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How It Works

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