# How to Vibe Code Your Own Omnisend (and Stop Paying for It)

> Email and SMS marketing for ecommerce

- Site: https://omnisend.com
- Category: Marketing Automation
- Verdict: **Serious undertaking** (45/100 vibecodeable)
- Estimated effort: 6+ weeks of full-time work and debugging

## Verdict

Build a simplified single-tenant marketing dashboard subset, but keep paying for the real product if you need reliable bulk email deliverability.

While vibecoding can quickly assemble the Next.js UI, contact tables, and basic workflow triggers, you will hit a brick wall when trying to match production-grade email deliverability and high-throughput e-commerce webhook ingestion. Writing code to send transactional emails via an SMTP relay is easy, but maintaining pristine domain reputation, handling ISP feedback loops, and executing complex real-time segmentation queries across millions of transactions requires substantial systems engineering that AI agents cannot magically provision for free.

### What you can't replicate

- Established ISP sender reputation and warm-up infrastructure
- Pre-built certified integrations across 250+ ecommerce app stores
- Global SMS carrier routing compliance and legal safeguards

## What it does

Omnisend is an omnichannel marketing automation platform purpose-built for ecommerce brands, enabling synchronized campaigns across email, SMS, and web push notifications.

### Core features

- Contact list management & custom segmentation rules
- Drag-and-drop email & form builder with AI content generation
- Multi-channel workflow automation engine (Welcome, Abandoned Cart)
- Transactional email sending pipeline with DKIM/SPF/DMARC handling
- SMS broadcast and automation routing
- Web push notification dispatcher
- Ecommerce event webhook ingestion (Shopify/WooCommerce sync)
- Campaign analytics and performance reporting dashboard

## The business

### Pricing

- Free: $0/mo
- Standard: $16/mo
- Pro: $59/mo

### Funding

$4.4M raised.
- Seed
Investors: Bootstrap / Customer-funded

Founded 2014.
Team size: 250+.

## The hard parts

- Inbox placement and reputation management (preventing blacklisting on bulk sends)
- High-throughput asynchronous webhook sinking and event queue processing
- Real-time evaluation of dynamic relational segmentation queries across millions of rows
- Multi-channel telephony compliance (TCPA quiet hours, opt-outs, carrier routing)

## How to vibe code Omnisend

### Prerequisites

- Node.js (free): Required for running the Next.js runtime and backend worker processes.
- GitHub (free): Source control and integration with deployment platforms.

### Recommended AI tools

- Claude Code: Best-in-class multi-file agentic coding tool for scaffolding full-stack SaaS features and handling complex backend logic.
- Cursor: AI-native editor for rapidly iterating on complex drag-and-drop UI components and React forms.

### Stack

- Frontend: Next.js
- Backend: Next.js API Routes / Server Actions
- Database: Supabase
- Auth: better-auth
- Payments: none
- Other: Resend, Twilio, Anthropic API, Vercel AI SDK

### Hosting

- Vercel (Hosting the Next.js frontend and serverless API endpoints.): $0-20/mo
- Supabase (Storing contacts, segments, campaign logs, and workflow states in Postgres.): $0-25/mo

### Build guide

1. **Project Scaffolding & Database Schema** — Initialize a Next.js application with Supabase, configure better-auth, and set up the relational schema for contacts, campaigns, segments, and workflow steps.

```
Scialize a new Next.js project using Tailwind CSS and TypeScript. Configure Supabase as the relational database and integrate `better-auth` for user authentication. Create the following database tables using SQL migrations: `contacts` (id, user_id, email, phone, status, tags, custom_properties jsonb, created_at), `campaigns` (id, user_id, type [email|sms], subject, content, status, sent_at), `segments` (id, user_id, name, filter_rules jsonb), and `workflows` (id, user_id, name, trigger_type, steps jsonb, active boolean). Ensure proper foreign key constraints, indexes on email and user_id, and Row Level Security (RLS) policies so users only access their own data. Provide clean TypeScript types for all database models.
```

2. **Contact Management & CSV Import** — Build the contact list view, manual contact creation, and a CSV import pipeline with error validation and duplicate handling.

```
Build a contacts management interface in Next.js under `/dashboard/contacts`. Include a data table displaying contact email, phone, status (subscribed, unsubscribed), and tags with pagination and search. Implement a CSV import modal that parses uploaded files using `papaparse`, validates email formats, checks for duplicates against existing records in the Supabase `contacts` table, and bulk-inserts valid rows using Supabase transactions. Add a manual 'Add Contact' form with validation via Zod and React Hook Form. Ensure all UI components match a clean modern SaaS aesthetic.
```

3. **Dynamic Segmentation Engine** — Implement a visual segment builder that constructs dynamic audience filters based on contact properties and event history.

```
Build a dynamic segmentation builder page at `/dashboard/segments/new`. Allow users to define compound filter rules (e.g., 'Email status equals subscribed' AND 'Tags contain VIP'). Save these rules as JSONB in the `segments` table. Create a server-side query builder function that translates these JSONB rules into optimized SQL WHERE clauses against the `contacts` table to compute and display the real-time matching audience count instantly when rules change. Include options to view the matching contacts list.
```

4. **Campaign Creator & Resend Email Dispatch** — Create an email campaign composition view integrated with the Resend API for transactional and promotional dispatch.

```
Build an email campaign creation studio at `/dashboard/campaigns/new`. Include fields for campaign name, subject line, preview text, and an HTML/Markdown editor. Integrate the Resend API (`resend` npm package) to handle email sending. When a user selects a target segment, fetch all matching contacts from Supabase, iterate over them securely in batches, and dispatch emails via Resend. Log each dispatch outcome (success, failure, timestamp) in a new `campaign_logs` table. Add a reporting dashboard at `/dashboard/campaigns/[id]` showing total sent, opened, and clicked metrics.
```

5. **Multi-Channel Workflow Automation** — Implement automated triggers and multi-step workflows for welcome series and cart recovery using background processing.

```
Build a workflow automation builder at `/dashboard/workflows`. Support triggers like 'Contact Subscribed' and actions like 'Send Email' or 'Wait X Hours' or 'Send SMS via Twilio'. Store workflow definitions in the `workflows` table. Implement a webhook endpoint at `/api/webhooks/events` that ingests external events (e.g., user signup, order created), evaluates active workflows matching that trigger, and queues execution steps. Use Supabase background functions or scheduled cron jobs to process delayed workflow steps (such as waiting 24 hours before sending a follow-up email).
```

6. **AI Content Assistant** — Integrate the Anthropic API and Vercel AI SDK to generate email subject lines, body copy, and segment rules via natural language prompts.

```
Incorporate AI-powered marketing assistants into the campaign and segment builders using the Vercel AI SDK and Anthropic API (`@ai-sdk/anthropic`). Create an API route at `/api/ai/generate` that accepts a prompt and a task type (`subject_line`, `email_body`, or `segment_rules`). Implement UI buttons in the campaign editor ('Generate with AI') and segment builder ('Describe audience in plain English') that call this endpoint and dynamically inject the generated text or filter rules into the form state. Handle loading states and error handling gracefully.
```

### Cost vs paying

**Starting costs (one-time):**

- Custom domain and DNS setup: $12 one-time
- Total: ~$12 one-time

**Ongoing costs (monthly):**

- Supabase Pro: $25/mo
- Resend / Twilio API usage: $15/mo
- Cursor / Claude Code subscriptions: $20/mo
- Total: ~$60/mo

- Paying for the SaaS instead: $59/mo
- Build time: 45 hours
- AI tool credits: $20/mo
- Break-even: Never (commercial SaaS is cheaper given your time value)

## Sources

- [Omnisend Official Website & Pricing Scrapes](https://omnisend.com)
- [Startup Intros - Omnisend Profile](https://startupintros.com/startup/omnisend)
- [Tracxn - Omnisend Company Profile & Financials](https://tracxn.com/d/companies/omnisend)