Kopra - Custom Fields as a Service

Every B2B SaaS product eventually gets the same request: "Can we add a custom field for X?" One customer wants an insurance number on bookings. Another wants a dropdown for project priority. A third wants a notes field on invoices. You know the pattern. The standard options are all painful. Adding a database column per customer request doesn't scale. The EAV pattern turns every query into a self-join nightmare. Building a full custom fields system from scratch takes 3-6 months and pulls your engineering team off the actual product. Kopra handles the infrastructure so you don't have to. What Kopra does: Drop in an embeddable field editor that white-labels into your product. Your end users never see the word "Kopra." The field editor matches your design system through a comprehensive theming API covering fonts, colors, spacing, borders, and focus states. A clinic receptionist using your booking platform, a sales rep using your CRM, a project manager using your PM tool - they all see native-looking form fields. Your customers (the businesses using your SaaS) get a self-service configuration panel where they add their own fields without filing support tickets. A dental clinic adds "Tooth Number" and "Insurance Carrier." A physiotherapy practice adds "Injury Type" and "Referring Doctor." Each tenant sees only their own custom fields alongside your global defaults. Multi-tenant isolation is enforced at every layer. How integration works: Install the TypeScript SDK (npm install @kopra-dev/sdk), build a token endpoint on your backend (5 lines of Express/Flask/Go), and embed the field editor in your frontend. Total integration time: an afternoon, not a quarter. For teams that want full control over rendering, the REST API provides endpoints covering field groups, global fields, tenant fields, field values, webhooks, and search. Build your own UI, use Kopra as a headless backend. For AI-powered workflows, the MCP server exposes tools that let AI agents create fields, save values, set up webhooks, and manage tenant configurations. An AI assistant can handle "Set up Downtown Physio with fields for injury type, referring doctor, and sessions remaining" as a single conversation. What's included on every plan (including Free): - REST API with endpoints and interactive Scalar API docs - TypeScript SDK with full type safety (CJS, ESM, IIFE builds) - Embeddable field editor with complete theming control - Tenant self-service configuration panel - Webhooks with signed payloads and automatic retry - Audit logging for every create, update, and delete - CSV export for all field values - MCP server for AI agent integration - 12 field types: text, number, boolean, date, select, multi-select, email, URL, textarea, enum, JSON, and more Pricing: Free tier gets you started with 3 field groups, 10 tenants, and 5,000 API calls/month. No credit card required. Starter at $31/month scales to 100 tenants and 50,000 API calls. Pro at $107/month handles 500 tenants with priority support. Built for developers. Priced for startups.