Starting November 1, 2026, your first upgrade from the Kiro Free tier comes with a free trial: the rest of that month on Pro is free, and you get 500 trial credits on any paid plan (Pro, Pro+, Pro Max, or Power). From the same date, Kiro prorates plan fees and plan credits to the second when you upgrade partway through a month, so what you pay and the credits you receive match the time left in the month. The free trial applies only to your first upgrade; a later upgrade is prorated without a second free month. See How proration works for the formula and the worked example.
Kiro offers five service tiers: Kiro Free, Kiro Pro, Kiro Pro+, Kiro Pro Max, and Kiro Power. New Kiro users start on the perpetual Kiro Free tier.
Credits are consumed fractionally based on each request. Simple edits and shorter prompts will use fewer credits than complex, lengthy tasks. This means that fractional credits allow you to get more value from your credit allocation.
| Tier | Credits | Add-on credits |
|---|---|---|
| Free | 50 | Not available |
| Pro | 1,000 | Available to purchase |
| Pro+ | 2,000 | Available to purchase |
| Pro Max | 5,000 | Available to purchase |
| Power | 10,000 | Available to purchase |
See the pricing page for current tier prices. Learn about add-on credits for usage beyond plan limits.
Note the following billing practices when you subscribe, upgrade, downgrade, unsubscribe, and use add-on credits. The proration and free-trial rules in this section take effect November 1, 2026.
Kiro prorates to the second, based on the exact time you upgrade. Your share of the month is the seconds remaining in your billing cycle divided by the total seconds in the month.
- Prorated fee = (seconds remaining / total seconds in month) × monthly plan fee
- Prorated credits = (seconds remaining / total seconds in month) × monthly plan credits
For example, Pro costs $20 per month with 1,000 credits. In a 30-day month (2,592,000 seconds), upgrading at 00:00 UTC on day 15 leaves 16 days (1,382,400 seconds). The prorated fee is (1,382,400 / 2,592,000) × $20 = $10.67, and the prorated credits are (1,382,400 / 2,592,000) × 1,000 = 533. If you upgrade later in the day, fewer seconds remain, so the prorated fee and credits are lower.
If you are on the Kiro Free tier and upgrade to a paid plan for the first time, you get a free trial:
- The rest of that month on Pro is free. If your first upgrade is to Pro, your first bill arrives on the first of the following month. If your first upgrade is to a bigger plan, you pay only the difference; see Starting on a bigger plan.
- You get 500 trial credits on any paid plan: Pro, Pro+, Pro Max, or Power. Kiro uses your plan credits first, then your trial credits. Trial credits expire 12 months after you receive them; they don't expire at the end of the month.
In the example above, a first upgrade to Pro costs $0 for the rest of the month, and you receive 533 plan credits plus 500 trial credits.
The free trial applies only to your first upgrade.
You can make your first upgrade to Pro+, Pro Max, or Power instead of Pro. The free Pro month still counts toward it: you pay only the difference between your plan's prorated price and the prorated Pro price, and you receive that plan's prorated credits plus 500 trial credits.
On Pro+ ($40) at the same moment as the example above, the prorated fee is $21.33. Subtract $10.67 for the free Pro month, and you pay $10.67. The following table assumes a first upgrade at 00:00 UTC on day 15 of a 30-day month.
| Plan | Prorated fee | You pay | Plan credits | Trial credits | Total credits |
|---|---|---|---|---|---|
| Pro | $10.67 | $0 | 533 | 500 | 1,033 |
| Pro+ | $21.33 | $10.67 | 1,067 | 500 | 1,567 |
| Pro Max | $53.33 | $42.67 | 2,667 | 500 | 3,167 |
| Power | $106.67 | $96.00 | 5,333 | 500 | 5,833 |
If you upgrade again later, Kiro prorates your fee and credits for the time left in the month. You don't get a second free month.
If you purchased add-on credits before upgrading, they remain in your balance. After the upgrade, Kiro uses your new plan's higher credit allocation first, so your add-on credits are preserved for future use rather than being consumed immediately.
If you downgrade from a higher tier to a lower tier mid-month, you are charged the full fee for the current month. For example, if you downgrade from Pro+ to Pro on June 2nd, you'll be charged the full Pro+ subscription fee for June. From July onward, you will be charged the Pro fee.
For all tiers, your plan credits renew at the beginning of the next billing cycle. Trial credits don't reset at the end of the month. They stay available until they expire, 12 months after you receive them.
Billing