Kiro vs Antigravity
Both are big-cloud bets on agent-first IDEs. One charges in countable credits and offers a wide model list; the other is free but Gemini-shaped.
Updated August 28, 2026 · Independent comparison — Kiro, Google Antigravity are separate products.
Kiro
AWS's spec-driven agentic IDE
Kiro is AWS's spec-driven agentic IDE, sold in credits: Free 50, Pro $20 for 1,000, Pro+ $40 for 2,000, Pro Max $100 for 5,000 and Power $200 for 10,000. Unused monthly credits do not roll over, but purchased add-on packs at $0.04 a credit roll for twelve months. Its model list is unusually broad for a first-party IDE, spanning GPT-5.6, Claude Opus 5 and Sonnet 5, DeepSeek, MiniMax and GLM. Its terms explicitly forbid routing Kiro through third-party automation harnesses such as OpenClaw.
Google Antigravity
Google's agent-first IDE, free in preview
Google Antigravity is an agent-first IDE available free in public preview, with editor, terminal and browser agents plus a CLI. The free tier is metered by a weekly agent quota that Google does not publish numerically, while Tab and Command completions are typically unlimited. To get more headroom you buy a Google AI plan rather than an Antigravity plan; paid tiers share one Gemini quota pool and can purchase AI credits as overage at API rates. Non-Gemini models sit on a separate, smaller limit because of capacity.
Bottom line
Both are big-cloud bets on agent-first IDEs. One charges in countable credits and offers a wide model list; the other is free but Gemini-shaped. Choose Kiro if you want a countable meter — 1,000 credits at $20, 10,000 at $200; choose Google Antigravity if free matters more than model choice.
Pricing
| Feature | Kiro | Google Antigravity |
|---|---|---|
| Price/mo | Free 50 credits · Pro $20 · Pro+ $40 · Pro Max $100 · Power $200 | Free in public preview |
| Intro promo | None published | Not applicable |
| Billing shape | Credits — 1,000 / 2,000 / 5,000 / 10,000 by tier | Quota — weekly agent allowance |
Models & Context
| Feature | Kiro | Google Antigravity |
|---|---|---|
| Models included | GPT-5.6, Claude Opus 5 and Sonnet 5, Haiku 4.5, DeepSeek, MiniMax, GLM, Qwen3 Coder Next | Gemini Flash and Pro family; limited non-Gemini on a separate quota |
| Context window | Not published | Not published |
Limits & Overage
| Feature | Kiro | Google Antigravity |
|---|---|---|
| Limits (5h / weekly / monthly) | Monthly credits that do not roll over; add-on packs at $0.04/credit roll for 12 months | Weekly agent quota, not published numerically; Tab and Command typically unlimited |
| What happens past the cap | Buy add-on packs, or stop — no silent model downgrade | Wait — or buy a Google AI plan for more headroom |
| Parallel-agent friendly | Not published | Multi-agent by design; the weekly cap is the throttle |
Access & Lock-in
| Feature | Kiro | Google Antigravity |
|---|---|---|
| Host agents & IDEs supported | Kiro IDE, Kiro CLI, web preview, Kiro Crew, ACP-compatible IDEs, CI reviews | Antigravity IDE on Windows, macOS and Linux, plus the Antigravity CLI |
| Gives you an API key | ✗ | ✗ |
| Can drive a third-party agent | No — routing through harnesses such as OpenClaw is expressly not permitted | No — AI Studio keys are a separate product |
| Payment / region friction | Major cards; premium models are geo-gated; each human needs their own subscription | Google account; nothing to pay in preview |
Verdict at a glance
| Feature | Kiro | Google Antigravity |
|---|---|---|
| Best for | Spec-driven development with cheap, long-lived overage credits | A free, genuinely agentic IDE if the weekly cap fits your work |
Meter and restrictions
| Feature | Kiro | Google Antigravity |
|---|---|---|
| Price to start | Free tier of 50 credits, then $20 | Free in public preview |
| Meter | Credits, published per tier | Weekly agent quota, not published |
| Unused allowance | Monthly credits expire; purchased add-ons roll 12 months | Resets weekly |
| Third-party harnesses | Expressly not permitted (e.g. OpenClaw) | Not supported |
| Model breadth | Wide — five labs | Gemini-centric |
The Verdict
Choose Kiro if...
- ✓You want a countable meter — 1,000 credits at $20, 10,000 at $200
- ✓You want a broad model list from a first-party IDE: GPT-5.6, Claude Opus 5, Sonnet 5, DeepSeek, MiniMax, GLM
- ✓Spec-driven development is how you want to work
- ✓You want add-on credits at $0.04 that roll for twelve months
- ✓You want a product that is generally available rather than in preview
Choose Google Antigravity if...
- ✓Free matters more than model choice
- ✓Gemini models do your work and the weekly quota fits
- ✓You want editor, terminal and browser agents in one product
- ✓You are happy to buy a Google AI plan later if the cap starts biting
Frequently Asked Questions
What is the difference between Kiro and Google Antigravity?
Kiro is AWS's spec-driven agentic IDE, sold in credits: Free 50, Pro $20 for 1,000, Pro+ $40 for 2,000, Pro Max $100 for 5,000 and Power $200 for 10,000. Google Antigravity is an agent-first IDE available free in public preview, with editor, terminal and browser agents plus a CLI.
How much do Kiro and Google Antigravity cost?
Kiro: Free 50 credits · Pro $20 · Pro+ $40 · Pro Max $100 · Power $200. Google Antigravity: Free in public preview. See the pricing table above for full plan details.
Should I choose Kiro or Google Antigravity?
Choose Kiro if you want a countable meter — 1,000 credits at $20, 10,000 at $200. Choose Google Antigravity if free matters more than model choice.
1DevToolOne window, every agent you're paying for
Whichever seat wins here, you end up locked to one vendor's harness — and most of these subscriptions are contractually barred from driving anything else. 1DevTool runs Claude Code, Codex CLI, Cline, OpenCode and Gemini CLI side by side in persistent terminals, so you can put each subscription behind the agent it's actually licensed for and switch between them without switching windows. It adds an HTTP client, a 13-engine database client and an embedded browser too. One-time $29, no subscription.