Axure
Balsamiq
Invision
Zeplin
Moqups
Proto.io
ProtoPie
Flinto
Apiframe
PiAPI AI
Apiframe.ai is a unified, developer-oriented REST API that lets teams access multiple AI media-generation models (image, video, music/audio, and headshots) through one integration, instead of integrating each vendor separately.
Key features:
Multi-model access via one API (e.g., Midjourney, Luma, Suno, and others) with a consistent integration approach.
Webhook-native / async workflow: receive status updates and final results via a webhookurl, with optional webhooksecret validation (sent as x-webhook-secret).
Automation integrations (site highlights Zapier, Make, Pipedream, n8n) for trigger-based generation, batch processing, and multi-step workflows.
SDK support: official Node.js SDK is documented (and linked to npm).
Get started with the free plan.
Axure
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Zeplin - Collaboration app for UI designers & frontend developers
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Proto.io - Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should. Sign up for a free 15-day trial and get started.