Kopra.dev
Add custom fields to your SaaS product without building the infrastructure. Embeddable field editors, REST API, TypeScript SDK, and MCP server for AI agents.
Add custom fields to your SaaS product without building the infrastructure. Embeddable field editors, REST API, TypeScript SDK, and MCP server for AI agents.
This page is designed to help you find out whether Kopra.dev is good and if it is the right choice for you.
Kopra is custom fields as a service. It lets you add customizable fields to your SaaS product without building the infrastructure yourself.
Your customers always end up asking: "can we add a custom field here?" Instead of spending months building EAV tables, form renderers, and per-tenant configurations, you integrate the Kopra SDK or REST API. Done in minutes.
The field editor is white-label - it looks native to your app, not like a third-party widget.
Any SaaS product where users need to track data your schema doesn't support. CRMs, project management tools, booking systems, healthcare platforms, ERPs - anywhere customers want "just one more field."
Free tier available. Paid plans on the website.
Listed in
Embeddable field editor
White-label UI component that looks native to your app
Tenant self-service
Your customers add their own fields without engineering tickets
REST API
Full CRUD for field groups, fields, and values
TypeScript SDK
Works with React, Vue, Next.js, Svelte, or any framework
Webhooks
Get notified on every field and value change
MCP server
AI agents can manage fields via Model Context Protocol
Theming
Full control over colors, fonts, spacing, and layout
Per-tenant field limits
Control how many fields each customer can create
Autosave
Fields save automatically after changes
Field validation
Required, min/max length, min/max value, regex pattern
Field types
string, textarea, number, boolean, date, email, url, select, multiselect
SDK formats
CJS, ESM, IIFE (script tag)
There are no direct competitors in the custom fields as a service space. The alternative is building it yourself, which typically takes 3-6 months of engineering time and ongoing maintenance.
Kopra handles: - Multi-tenant data isolation - Field validation - Tenant self-service configuration - Webhooks on every change - Audit logging
Developers and technical founders building SaaS products whose customers are asking for custom fields. Any product where users need to track data the default schema doesn't support: - CRMs - Project management tools - Booking systems - Healthcare platforms - ERPs
TypeScript, React, Node.js
Kopra is the only dedicated custom fields service. Every SaaS team that needs custom fields builds it from scratch - EAV tables, form renderers, per-tenant configuration, validation, settings UI. Kopra replaces all of that with a single SDK integration. The field editor is embeddable and white-label, so your users never know it's not built in-house.
I kept running into the same problem at every company I worked at: customers would ask "can we add a custom field here?" and the team would spend months building the infrastructure for it. After building custom fields systems from scratch multiple times, I decided to turn it into a service so no one has to build it again.
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