Alloy vs Hy4 preview: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Alloy and Hy4 preview — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
Alloy
Alloy
Create pixel-perfect, interactive prototypes by capturing your real product pages across desktop and mobile.
Key features
- Instant Browser Capture: A browser extension captures live product pages and UI state instantly to create prototypes that mirror the real product’s visuals and layout.
- Pixel-Perfect Prototypes: Builds lifelike, pixel-accurate prototypes that preserve styling and layout for realistic demos and usability testing.
- Interactive Behavior: Supports interactive prototypes with realistic navigation and interactions so stakeholders can experience flows like the real product.
- Cross-Platform Clients: Desktop (macOS, Windows), web, iOS and Android apps allow capturing, viewing, and testing prototypes across devices.
- AI-Powered Prototyping: Uses AI to accelerate prototype generation and streamline the process of converting captured pages into interactive mockups.
- Real-Time Mobile Collaboration: Mobile app features enable real-time communication and synchronization between devices for field teams and device testing.
- Sharing & Team Workflows: Tools to share prototypes with teammates and customers for feedback, demos, and user testing with minimal setup.
- Quick Start Guides: Step-by-step documentation and guides to get started quickly, including capturing pages and building shareable prototypes.
- Instantly capture real product pages from the browser via a browser extension
- Generate lifelike, interactive prototypes that mirror the real product UI
- Cross-platform apps: macOS, Windows, Web, iOS and Android
- AI-powered assistance for rapid prototyping (public content references AI-powered prototyping)
- Share prototypes with teams and customers for feedback and demos
- Alloy Mobile for real-time communication between devices/field users
Best for
- Rapid UX Validation: Capture a live web page and convert it into a clickable prototype to run usability tests with users within hours.
- Stakeholder Demos: Produce pixel-perfect interactive demos from the actual product to show realistic flows to customers or executives.
- Cross-Device Testing: Use desktop and mobile clients to test interactions and layouts across platforms and replicate real-device behavior.
- Field Collaboration: Equip field teams with Alloy Mobile to communicate in real time between devices and validate device-specific workflows.
- Design Iteration: Quickly capture current product screens, iterate on interactions, and share updated prototypes for fast feedback cycles.
- Pre-Release QA: Create prototypes from the production UI to validate edge-case interactions and flows before shipping changes to users.
- Design teams creating high-fidelity prototypes that match the live product for usability testing
- Product teams demonstrating realistic product flows to stakeholders and customers
- Marketing and sales teams preparing interactive demos that reflect current product UI
- Field teams using Alloy Mobile for real-time device-to-device communication during installations or on-site workflows
Hy4 preview
Tencent
Tencent's open-weight Hy4 preview, a 770B-parameter Mixture-of-Experts model with 49B active parameters and a 1M-token context window.
Key features
- 770B Mixture-of-Experts Architecture: Holds 770 billion total parameters while activating only 49 billion per token, so capacity scales without proportional inference cost.
- 1M-Token Context Window: Accepts inputs exceeding one million tokens, allowing whole codebases, long document sets or extended agent traces in a single prompt.
- Apache 2.0 Open Weights: Released under a permissive licence that allows commercial use, modification and redistribution with no separate agreement.
- Productivity Task Focus: Tuned for real-world coding, office work and scientific research rather than narrow benchmark optimisation.
- Multi-Product Availability: Accessible globally through Tencent's WorkBuddy, CodeBuddy, Yuanbao and ima applications in addition to the raw weights.
- API Access via TokenHub and OpenRouter: Can be called through Tencent Cloud TokenHub or OpenRouter for teams that prefer hosted inference over self-hosting.
Best for
- Whole-Repository Code Work: Load an entire codebase into the million-token context to reason about refactors and cross-file dependencies at once.
- Long-Horizon Agent Tasks: Drive multi-step agent workflows where the full history of tool calls and intermediate results must stay in context.
- Self-Hosted Deployment: Run a frontier-scale open-weight model on private infrastructure where data cannot leave the organisation.
- Scientific Literature Analysis: Ingest large collections of papers or experimental logs and synthesise findings without chunking the input.
- Office Document Processing: Summarise, draft and restructure long reports, contracts and spreadsheets in enterprise workflows.
- Commercial Fine-Tuning: Adapt the weights for a proprietary product under the Apache 2.0 licence without negotiating a model licence.