AI Tool Comparison
Comparing as AI Code Editors & IDEsGoogle Antigravity vs Kiro
Google Antigravity
VS
Kiro
Verdict by Category
Detailed Comparison
Feature
Google Antigravity
Kiro
Pricing
FreemiumGoogle Antigravity is free during its preview period for any user with a Google account. A unified AI credit system applies: credits are drawn down at API-equivalent ratios across Gemini Flash and Pro models (e.g., if Flash is 8x cheaper than Pro, you can use 8x more Flash tokens for the same credit spend).
Google AI Pro at $20/month provides additional AI Premium credits suitable for regular development use. Google AI Ultra was reduced from $250/month to $100/month for a lighter high-frequency tier, with a separate $200/month tier for the highest capacity. Add-on credits can be purchased at any time via the CLI or IDE credits panel.
For GovCloud environments, a paid Gemini Code Assist Standard ($19/user/month) or Enterprise ($45/user/month) license is required — no free tier in GovCloud. Enterprise customers access Antigravity through the Gemini Enterprise Agent Platform under Google Cloud terms with centralized admin controls and compliance features.
FreemiumKiro uses a credit-based Freemium model with five tiers and no daily or weekly rate limits. Credits are consumed fractionally per request \u2014 simple edits use fewer credits than complex spec-driven builds.
Free tier includes limited credits with a restricted model selection (no Free tier in AWS GovCloud). Pro is $19/user/month, Pro+ is $39/user/month, Pro Max is $79/user/month, and Power is $199/user/month \u2014 each offering progressively more credits and model access. All paid plans include a $20 credit on first upgrade via social login or Builder ID (not IAM Identity Center). Add-on credits cost $0.04 each, available in packs from $5 (125 credits) to $100, rolling over for 12 months from purchase date.
Enterprise pricing is custom via AWS sales and includes IAM Identity Center SSO, AWS PrivateLink VPC endpoints, admin governance controls, usage dashboards, cost management, IP indemnity, compliance features, and overage controls managed by admins. All active paid Kiro subscriptions also provide access to Amazon Q Developer IDE plugins during the transition window through April 30, 2027.
Categories
AI Coding AssistantsAI Productivity ToolsAI Developer APIs & PlatformsAI No-Code / Automation Tools
AI Coding AssistantsAI Productivity ToolsAI Developer APIs & PlatformsAI No-Code / Automation Tools
Summary
Google's agentic AI IDE and CLI — Gemini 3, scheduled tasks, free during preview
Spec-driven agentic IDE by AWS — build what you mean, not just what you say
Google Antigravity Pros & Cons
Pros
- Built by Google with Gemini 3.1 Pro — the deepest integration with Google's most capable model and GCP ecosystem
- Free during preview with no credit card required — full feature access including agent manager and scheduled tasks
- Scheduled Tasks (cron) enable truly autonomous agents that work without any human trigger — unique among major IDE platforms
- Live voice transcription via Gemini Audio — describe complex tasks faster than typing
- IDE extensions (Aug 2026) let enterprise developers use Antigravity from VS Code and JetBrains without switching editors
- Full platform: IDE + CLI + SDK + Enterprise Agent Platform — the most complete Google developer toolchain ever shipped
Cons
- Proprietary closed-source — unlike Gemini CLI (Apache 2.0), Antigravity's source code is not publicly available
- Gemini-centric — while Claude and GPT-OSS are supported, Gemini models are prioritized; less model flexibility than Kiro or Cline
- Still in preview as of August 2026 — some enterprise and GovCloud features are new and less battle-tested than Cursor or Windsurf
- Credit-based pricing can be unpredictable for heavy users with complex agent tasks
- Requires Google account and GCP setup for enterprise access; additional procurement overhead for non-GCP organizations
- Free preview status subject to change — pricing structure may shift as product exits preview
Kiro Pros & Cons
Pros
- Only AWS-native agentic IDE — built and operated by AWS with the same security, reliability, and compliance standards trusted by millions of customers
- Spec-driven development solves vibe coding's core problem: generating code that actually matches your intent, verified by property-based tests
- Parallel agents work concurrently across the codebase — dramatically faster than single-agent coding tools for complex multi-file tasks
- Broadest frontier model roster of any AWS developer tool — Claude Opus 5, Sonnet 5, GPT-5.6 (Sol/Terra/Luna), DeepSeek, and Auto routing
- Unified agent harness across IDE, CLI, web, and mobile — one .kiro/ config works everywhere
- Hooks enable fully automated SDLC workflows — documentation, tests, and standards enforcement on every file save or commit without interrupting flow
Cons
- New product — released July 2025, less battle-tested than Cursor, Windsurf, or VS Code for large complex production codebases
- Credit-based pricing model can be unpredictable — complex spec-driven builds consume credits faster than vibe coding
- Spec-driven workflow has a learning curve; developers accustomed to chat-based copilots need to adapt to structured specs
- Built on Code OSS, not full VS Code — some proprietary VS Code Marketplace extensions may not be available via Open VSX
- Kiro Enterprise pricing is custom and sales-gated — no transparent list price for large team deployments
- AWS GovCloud requires paid subscription with IAM Identity Center — no free tier in that environment