A decision for a beginner, not a spec sheet. Scores are our weights. Prices are the public plans, and anything marked verify on the tool page should be re-checked before you pay.
Pick Google Antigravity if you are trying an editor agent without a subscription.
Pick Kiro if you want a web app or automation you will keep in a repo and review as a diff.
A free agent IDE, with higher quotas on Google AI Pro and Ultra.
Cheapest verified paid plan: Google AI Pro · $19.99/mo
An agentic IDE that turns a prompt into a spec, then into a diff.
Cheapest verified paid plan: Pro · $20/user/mo
Web app or SaaS
Mobile app
Game
Website or landing page
Automation or script
No code
I can follow a change
I already develop
Last verified 2026-10-19
Individual
Free
VerifiedUnlimited Tab and Command requests. Weekly agent quota. Gemini models, including Gemini 3.8 Flash, which the plans doc names as a core agent model. No published prompt count.
The Antigravity pricing page lists this at $0/mo.
Individual
$19.99/mo
VerifiedHigher Antigravity quota, refreshed every five hours until a weekly limit. AI credits can cover overage if you allow it. Also a Google One plan with storage and other Google AI benefits.
The dollar amount is the Google AI Pro price on Google One. Antigravity's own pricing page describes the higher limits and does not print $19.99.
Individual
$99.99/mo
VerifiedHighest Antigravity quota class, refreshed every five hours, plus third-party models. Google labels this 5x Pro Gemini usage.
Price is from Google One and Gemini subscription pages, which are the plans Antigravity docs say raise the quota.
Individual
$199.99/mo
VerifiedThe highest weekly limits Google documents for these plans, labeled 20x Pro Gemini usage.
Same source split as the 5x tier: quota rules on Antigravity docs, price on Google One.
Last verified 2026-10-19
Individual
Free
Verified50 credits a month. Claude Sonnet 4.5 and open-weight models such as Qwen3 Coder Next, DeepSeek 3.2, and MiniMax M2.1, with rate limits. No add-on credits. Kiro Web is not included.
The 50-credit free allowance is on the pricing page and the billing docs. The free tier is not offered on Kiro Enterprise or in AWS GovCloud.
Individual
$20/user/mo
Verified1,000 credits a month. Premium models, including Auto, Claude Sonnet 5, and Claude Opus 5, where those models are available. Add-on credits at $0.04. Kiro Web uses the same credits.
Price is on kiro.dev/pricing. The credit count is on the billing docs. Prices exclude tax. A first upgrade with social login or Builder ID gets a $20 credit toward the subscription, prorated for the partial month.
Individual
$40/user/mo
Verified2,000 credits a month, with the same paid-plan model access and add-on credits as Pro.
Price on the pricing page. Credit count on the billing docs.
Individual
$100/user/mo
Verified5,000 credits a month. The same feature set as Power, including specs, custom subagents, powers, and hooks.
The $100 price and the 5,000-credit count are on the pricing page's tier list, the billing docs, and Kiro's Pro Max announcement.
Individual
$200/user/mo
Verified10,000 credits a month, the largest self-serve pool, plus add-on credits at $0.04.
Price on the pricing page. Credit count on the billing docs. AWS GovCloud is approximately 20% higher and has no free tier. That regional markup is not a separate dollar row here.
Free quota refreshes weekly. Google AI Pro refreshes every five hours until a weekly limit. Ultra refreshes every five hours and has the highest weekly limits. Prompt counts are not published because heavier tasks spend more quota.
On the free plan, wait for the weekly refresh. There is no credit overage.
Plan credits renew at the start of the next billing cycle. Paid subscriptions are processed on the 1st of each calendar month. Unused plan credits do not roll over. Add-on credits, which are paid plans only, last 12 months.
On Free, wait for the monthly reset. Add-on credits cannot be bought on this tier, and Kiro Web is not included.
Google Antigravity's cheapest paid plan the ranking counts is Google AI Pro at $19.99/mo. Kiro's cheapest paid plan the ranking counts is Pro at $20/user/mo.
Google Antigravity is for trying an editor agent without a subscription, gemini-first coding on a weekly quota, and a $20-ish step up via Google AI Pro if the free week runs out.
Kiro is for a web app or automation you will keep in a repo and review as a diff, developers who want requirements and tasks written down before the agent edits, and a published monthly credit number, instead of an unpublished quota.
Google Antigravity scores 2 out of 5 for someone who does not want to read code. Kiro scores 2 out of 5. The scores are the same. Better than a pure terminal, and you are still in an IDE. Specs are written in plain language, and you still end up reading a diff. If code on screen is a dealbreaker, use a browser builder.
Google Antigravity: Free. Unlimited Tab completions and Command requests, Gemini models, and a weekly agent quota. The quota is not a published prompt count. It refreshes weekly, not every five hours. Kiro: 50 credits a month on the perpetual free tier, with Claude Sonnet 4.5 and open-weight models, subject to rate limits. Add-on credits are not available. Kiro Web is not on this plan.