AI app builder · marketplace · bring your own key

Build your
own
in minutes.

Describe the behavior. Plug in your API key. Preview the result. Ship it. No code scaffold, no infra, no waiting.

Start building freeBrowse marketplace

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Apps built

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Creators

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Total uses

App name

Support Copilot Pro

What it does

Answers support questions from our docs and escalates billing issues automatically.

What is Kyro?

The simplest path from AI idea to working, shareable app.

Most builders make you manage infra. Kyro focuses on what matters: describe the behavior, configure the model, preview the result, ship it. That's the entire loop.

Prompt-first

Describe behavior in plain language. No config files, no YAML, no infra decisions.

Bring your key

Plug in your OpenAI or Claude key. Your usage, your costs, your data — always.

Live preview

Click any UI element in the preview and annotate directly. Changes stay scoped to your notes.

One-click publish

Go private for your team or public on the marketplace. No deploys, no DNS, nothing.

Clone & remix

Fork any public app. Build on what already works instead of starting from zero.

Guardrails built in

Add knowledge context and constraints before you ship so behavior never drifts.

How it works

Three steps. One loop.

No config, no deploys, no wrestling with infra.

01 — Name & describe

Give your app a name.
Tell the AI what it does.

Write the app name and describe its job in plain language. No templates. No schema. The builder turns your words into a structured brief the AI works from.

Open the builder →

App identity

Name

Support Copilot Pro

What it does

A support assistant that answers from our docs and escalates billing issues to the right team.

Who it helps

Customers needing fast answers without waiting for a human agent.

02 — Configure behavior

Choose the model.
Set the tone. Add guardrails.

Pick OpenAI or Claude, plug in your API key, define voice and surface type, and add knowledge context. Set what the app can and can't do.

Works withOpenAIClaude

AI configuration

Provider

OpenAI

Model

GPT-5.1

Voice

Friendly

Surface

Chat

Knowledge context

Help center articles, pricing FAQ, escalation policy.

Guardrails

Do not fabricate facts. Escalate billing to humans. Stay on-topic.

03 — Preview & ship

Click elements.
Leave notes. Publish.

The live preview shows exactly what users will see. Click any element to annotate it. When you're satisfied, publish privately for your team or publicly on the marketplace.

See live apps →

Live preview

Ready to ship

Hero section

Headline & intro

2 notes

Prompt box

User input area

AI response

Output display

1 note

Sidebar

Context panel

Publish publicly
Keep private

Shipped our internal knowledge base tool in an afternoon. The team loves it.

Priya M.·Founder

Pricing

Start free. Scale when ready.

Bring your own key. No hidden usage fees from us.

Free

$0forever

Prototype with your own API key.

  • Unlimited drafts
  • Your API key
  • Private publishing
  • Basic analytics
Start free

Pro

Popular

$24/mo

For builders shipping seriously.

  • Everything in Free
  • Version history
  • Public marketplace listing
  • Better publishing flow
  • Priority support
Get Pro

Studio

$99/mo

Teams building AI tools together.

  • Everything in Pro
  • Shared workspaces
  • Team collaboration
  • Usage dashboard
  • Custom branding
Try Studio

No platform fees on API usage · Cancel any time

Ready?

Ship something
useful today.

Join builders shipping focused, real AI tools that people actually use.