# Google Antigravity vs OpenSilver

Google Antigravity records 16,054,109 monthly visits with +8.1% month-over-month growth and Freemium pricing. OpenSilver records 2,710 monthly visits with -31.6% growth and Paid pricing.

| Metric | [Google Antigravity](https://openaitools.app/tool/google-antigravity) | [OpenSilver](https://openaitools.app/tool/opensilver) |
| :--- | :--- | :--- |
| Website URL | https://antigravity.google | https://opensilver.net |
| Categories | AI Agent, AI Developer Tools, AI Code Assistant, AI Copilot | AI App Builder, AI Design Assistant, AI Developer Tools, AI Website Builder |
| Pricing Model | Freemium | Paid |
| Monthly Visits | 16,054,109 | 2,710 |
| MoM Growth Rate | +8.1% | -31.6% |
| Primary Market | India | United States |
| Direct Visits | 4,378,684 | 1,065 |
| Review Score | 4.6 | 4.2 |
| Saved Count | 1 | 0 |
| Supported Platforms | Website | Website |

## Google Antigravity

Google Antigravity is Google's entry into agentic software development, positioned as a platform rather than a single editor. Instead of asking an assistant to autocomplete a line, Antigravity is designed around agents that take on whole tasks: they read a codebase, produce artifacts such as plans and verification tests, and report back so a human can review the work. The product is distributed across several surfaces so it can fit different workflows — the Antigravity App as a command center for running multiple local agents in parallel, the Antigravity IDE as the fully featured editor with agent manager and artifacts, the Antigravity CLI for keyboard-driven terminal work, extensions for existing editors, and the Antigravity SDK for building custom agents on the same agent harness.

The platform is explicitly aimed at a broad audience: professional developers working in large enterprise codebases, hobbyists vibe-coding on the side, and everyone in between. Google's marketing highlights use cases like frontend and full-stack development, legacy and codebase migrations, technical debt and backlog burndown, automated testing and QA verification, incident triage and root cause analysis, data pipelines and SQL work, developer onboarding and architecture, and enterprise architecture and strategy.

Antigravity connects to Google's Gemini model line, with the site documenting model releases such as Gemini 4 Carbon, Gemini 4 Argon, and Gemini 3.8 Flash, plus agent features like voice mode, custom agents, and a plugin marketplace. It is available for macOS, Windows, Linux, and Googlebook, and Google states it is available at no charge for developers.

**Pricing & Plans:** Free to download and use for individual developers according to Google's own site; organization and enterprise plans are offered separately (pricing on request). Model and quota details can change, so check the official pricing page before committing a team.

- **Multiple agent surfaces:** A desktop app, a full agentic IDE, a terminal-first CLI, editor extensions, and an SDK let you run Antigravity agents wherever you already work.
- **Parallel local agents:** Group conversations into Projects and run several local agents at the same time, across multiple workspaces, rather than one at a time.
- **Artifacts and verification:** Agents produce designed artifacts such as plans and comprehensive verification tests so output can be reviewed, not just accepted.
- **Built on Gemini models:** Runs on Google's Gemini model line, including releases such as Gemini 4 Carbon, Gemini 4 Argon, and Gemini 3.8 Flash.
- **Agent SDK for custom agents:** Use short Python scripts against the Antigravity harness to prototype custom agents, automate engineering tasks, and run evaluations.

**Strengths:** Free for individual developers and available on macOS, Windows, Linux, and Googlebook; Covers many surfaces — app, IDE, CLI, extensions, SDK — so different workflows are supported; Backed by Google and its Gemini models with a steady release cadence; Verification-oriented: artifacts and tests make agent output easier to review

**Limitations:** Tied to Google's Gemini model line rather than being model-agnostic; Enterprise pricing is not published, so costs require contacting sales; Rapid model and feature changes mean quotas and capabilities can shift

[Profile (Markdown)](https://openaitools.app/tool/google-antigravity.md)

## OpenSilver

OpenSilver rebuilds the Microsoft Silverlight and WPF programming model on top of .NET and WebAssembly, so a codebase written in C#, VB or F# with XAML keeps working in Chrome, Firefox, Safari, Windows, macOS and Android. Teams that own a legacy Silverlight line-of-business application — or a Windows-only WPF desktop app — can move it to the browser while reusing over 95% of the original source, keeping screens visually identical so no user retraining or documentation rewrite is needed.

The framework ships with enterprise-oriented controls and library compatibility, including RIA Services and LightSwitch support, and the 3.3 release introduced an AI-enhanced drag-and-drop UI designer, the ability to host Blazor components directly inside XAML applications, and MAUI Hybrid integration. It also interoperates with Blazor, React and Angular when a team wants to mix stacks rather than migrate everything at once.

The core technology stack is free under the MIT license and can be downloaded as an SDK or tried instantly in the zero-setup XAML.io online IDE. For organizations that prefer not to run the migration themselves, Userware offers a commercial end-to-end migration service, support plans and pro services — which is where the paid side of the offering sits.

**Pricing & Plans:** The OpenSilver framework itself is free and open source under the MIT license, including the SDK and the online XAML.io IDE. Paid options come through Userware: commercial support plan subscriptions, pro services, and end-to-end WPF/Silverlight migration engagements quoted per project.

- **95%+ code reuse for legacy apps:** Recompile existing Silverlight or WPF C#, VB and F# code into a WebAssembly app that runs in any modern browser, avoiding a costly rewrite.
- **AI-enhanced visual designer:** OpenSilver 3.3 adds an AI-assisted drag-and-drop UI designer for building and editing XAML screens faster.
- **Blazor and MAUI interop:** Host Blazor components directly inside XAML applications and integrate with MAUI Hybrid, plus mix in React or Angular where useful.
- **Enterprise library compatibility:** Keeps support for RIA Services, LightSwitch and common third-party controls so established business apps keep working.
- **Zero-setup online IDE:** Try the framework immediately in the browser at XAML.io with no install and no signup, or download the SDK locally.

**Strengths:** Reuses the large majority of existing Silverlight/WPF code and preserves the pixel-level UI; Open-source MIT core with an installable SDK and a free in-browser IDE; Professional migration services and support plans available when you need them; Broad target coverage: all major browsers plus Windows, macOS and Android

**Limitations:** Targeted at teams with legacy .NET code rather than greenfield developers; Enterprise-grade migration and support are commercial and quoted per project; WebAssembly output can still be heavier than a hand-written modern front-end

[Profile (Markdown)](https://openaitools.app/tool/opensilver.md)

## Frequently Asked Questions

### How do Google Antigravity and OpenSilver compare in monthly traffic?

Google Antigravity has 16,054,109 monthly visits, while OpenSilver has 2,710. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Google Antigravity has a month-over-month growth rate of +8.1%; OpenSilver has -31.6%.

### How does pricing compare?

Google Antigravity: Freemium. Free to download and use for individual developers according to Google's own site; organization and enterprise plans are offered separately (pricing on request). Model and quota details can change, so check the official pricing page before committing a team. OpenSilver: Paid. The OpenSilver framework itself is free and open source under the MIT license, including the SDK and the online XAML.io IDE. Paid options come through Userware: commercial support plan subscriptions, pro services, and end-to-end WPF/Silverlight migration engagements quoted per project.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Claude](https://openaitools.app/tool/claude-2) | 1,253,439,413 | +23.8% | Freemium | Provides superior reasoning and artifact generation for coding tasks, but lacks a dedicated native desktop development command center. | [.md](https://openaitools.app/tool/claude-2.md) |
| 2 | [Lovable](https://openaitools.app/tool/lovable) | 31,052,090 | +3.8% | Freemium | Describe your idea in chat and Lovable turns it into a working app or website | [.md](https://openaitools.app/tool/lovable.md) |
| 3 | [Cursor](https://openaitools.app/tool/cursor) | 23,297,751 | +8.4% | Freemium | Offers a more mature polished AI-native coding experience, but lacks Google's specific native multi-agent command center ecosystem. | [.md](https://openaitools.app/tool/cursor.md) |
| 4 | [Base44](https://openaitools.app/tool/base44) | 14,039,232 | +0.5% | Freemium, Paid, Contact for Pricing | Build working apps, websites, and AI agents by describing them | [.md](https://openaitools.app/tool/base44.md) |
| 5 | [Replit](https://openaitools.app/tool/replit) | 10,016,437 | -7.7% | Freemium, Paid | Enables rapid full-stack app building and deployment entirely in the cloud, but offers less granular local agentic control. | [.md](https://openaitools.app/tool/replit.md) |
| 6 | [Emergent](https://openaitools.app/tool/emergent) | 5,788,850 | +5% | Freemium | Describe an app in chat and ship it | [.md](https://openaitools.app/tool/emergent.md) |
| 7 | [Qoder](https://openaitools.app/tool/qoder) | 5,145,040 | +81.8% | Freemium, Free Trial, Free | Deeply reads entire codebases to execute complex multi-file tasks, though integrated as an IDE plugin rather than standalone suite. | [.md](https://openaitools.app/tool/qoder.md) |
| 8 | [Kiro](https://openaitools.app/tool/kiro) | 3,330,476 | +4.6% | Freemium | Delivers robust spec-driven engineering and autonomous verification workflows, though configured differently than Google's developer platform. | [.md](https://openaitools.app/tool/kiro.md) |
| 9 | [Devin](https://openaitools.app/tool/devin) | 2,549,346 | +1% | Paid | Cognition's autonomous software engineer that ships real pull requests | [.md](https://openaitools.app/tool/devin.md) |
| 10 | [Orca](https://openaitools.app/tool/orca) | 1,025,891 | +1% | Free, Open Source, Enterprise on request | Open-source development environment running multiple CLI coding agents in isolated git worktrees, but requires manual setup. | [.md](https://openaitools.app/tool/orca.md) |

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Source: https://openaitools.app/compare/google-antigravity-vs-opensilver

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