Google Antigravity vs Kiro

Manager View supports up to 5 parallel agents working across different workspaces simultaneously. Agents report progress through an inbox-style interface with inbox notifications when human input is required. Diffs from completed agents can be reviewed and merged without switching projects.

Supports parallel agent execution but with less emphasis on visual orchestration. Agents follow structured specs and can work on different tasks, but the workflow is more focused on sequential spec-to-code pipelines rather than parallel independent sessions.

No native spec-driven development. Agents generate code directly from prompts without structured requirements documentation. While agents can plan before coding, there's no formal specification artifact that serves as source of truth.

Core differentiator. Converts natural language prompts into structured requirements using EARS notation, generates architectural designs backed by best practices, and breaks down work into tracked tasks. Makes specs the primary artifact and code the build output.

Defaults to Gemini 3.1 Pro/Flash with full first-party optimization. Also supports Claude Sonnet 4.6, Claude Opus 4.6, and GPT-OSS 120B. Can assign different models to different agents within the same mission.

Multi-model routing between Claude Sonnet for reasoning-heavy specs and Amazon Nova for high-throughput code generation. Uses Amazon Bedrock as the unified model plane, with support for various models through the AWS ecosystem.

Integrated Chrome browser allows agents to launch localhost, interact with applications (fill forms, click buttons), and screenshot results. Unique capability that closes the loop between code generation and visual verification.

Supports testing through Hooks system automation and can generate tests, but lacks a built-in browser for visual verification. Testing is more focused on automated unit/integration tests rather than visual UI validation.

Limited workflow automation beyond agent dispatch. No event-driven system for triggering actions on repository events. Focus is on manual agent orchestration rather than automated pipelines.

Hooks system enables event-driven automation that fires on file save, PR open, and repo events. Can run tests, update docs, regenerate fixtures, or cascade spec changes without manual prompting. Enables sophisticated CI-like workflows within the IDE.

Full VS Code fork with complete extension ecosystem compatibility. One-click import of existing settings, themes, and keybindings. Extensions from VS Code Marketplace work out of the box.

Based on Code OSS with VS Code settings import capability. Supports Open VSX compatible plugins. Most VS Code extensions work, but not all VS Code Marketplace extensions are available through Open VSX.

Deep Google ecosystem integration with Workspace, Cloud, and Gemini API. First-party features optimized for Gemini. Supports Claude and GPT but not as tightly integrated. Chrome integration is unique.

Native AWS integrations with CodeCatalyst, Q Developer, Bedrock, and IAM. 90+ integrations including GitHub, GitLab, Slack, Linear, Jira, Datadog. Natural fit for AWS-centric teams but awkward for non-AWS environments.

Opaque credit system with undisclosed credit-to-token conversion rates. Users report unexpected quota lockouts (7-10 days) even on paid tiers. Credit amounts for Pro/Ultra not publicly documented. Controversial pricing changes since December 2025.

Clear credit-based pricing: Free (50 credits), Pro ($20/mo, 1,000 credits), Pro+ ($40/mo, 2,000 credits), Power ($200/mo, 10,000 credits). Pay-per-use overage at $0.04/credit. Unused credits don't roll over, but pricing is predictable.