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Bring your own API key AI chat

Bring your own API key AI chat without building a UI.

Lifetime is for people who already have keys and want a finished workspace: multi-model chat, math visualization, branching, voice, and Ultra Mode—paid once, not rented monthly. Full workspace access requires a Pro or Lifetime plan.

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Pro from $14.99/month · Lifetime $149.99 one-time

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  • 1Lifetime one-time
  • 2Own API keys
  • 3Full workspace modes
Workspace preview
Use my keys—compare these two approaches and keep costs practical.
Your routed model

I’ll stay in your configured models and keep the answer actionable:

  1. 01Trade-offs listed without fluff
  2. 02Follow-up using a cheaper model when possible
  3. 03Branch for the deeper reasoning path only if needed

Ask anything

SearchLow

Who BYOK is for

You already pay providers—or want to.

Developers, power users, and budget-conscious multi-model users who prefer keys and a one-time product payment over another pure monthly bundle.

  1. 01

    Raw playgrounds are not a workspace

    API consoles lack math modes, branching, and durable product UX.

  2. 02

    Monthly stack fatigue

    Several AI subscriptions add up even when you already buy tokens elsewhere.

  3. 03

    Key control matters

    Some users want provider relationships and spend limits on their own accounts.

Lifetime workspace

Keys for access. Product for craft.

BYOK is not a blank slate—you still get milkyway.chat tools.

Multi-model UI

Work across families through a single chat workspace.

Configured via your keys.

Math modes

Strict Math and Math Visualization stay available as product features.

Not DIY.

Branching

Fork threads without losing the original path.

Built in.

Voice

Voice conversations on Lifetime.

Same plan.

Files & PDFs

Attach documents you choose for grounded work.

Your context.

Ultra Mode tools

Multi-agent depth when the product exposes Ultra on your setup.

For hard reviews.

Get started

Keys in, workspace ready.

A practical path for Lifetime users.

  1. 01

    Choose Lifetime

    One-time payment on the pricing page.

  2. 02

    Connect keys

    Follow in-app setup for the providers you want to use.

  3. 03

    Work normally

    Chat, attach files, branch, and use modes—without building a client.

Scenarios

When BYOK wins.

Existing OpenRouter or provider credits

I already buy tokens—I need a serious chat UI on top.

Lifetime → Connect keys → Multi-model day-to-day

Outcome

Workspace features without another pure SaaS model stack.

Cost control

Keep heavy reasoning rare; use faster models by default.

Model switch → Branch only when needed → Deep reasoning sparingly

Outcome

Spend follows your own provider meters.

Student power user

Pay once, study all semester with math modes and PDFs.

Lifetime → Strict Math → PDF attachments

Outcome

Predictable product cost plus own key usage.

FAQ

BYOK questions

What is the Lifetime price?

Lifetime is $149.99 one-time and is designed for bring-your-own API keys, plus voice.

Should I pick Pro instead?

Pro ($14.99/month) includes hosted premium models and voice without managing keys. Choose Pro for simplicity; Lifetime for BYOK and one-time payment.

Which keys are supported?

Supported providers and setup steps are shown in the product after purchase. Capabilities depend on the keys you connect.

Is this only for developers?

No. Anyone comfortable managing API keys can use Lifetime. If you want zero key setup, Pro is the smoother path.

How much does milkyway.chat cost?

Pro is $14.99 per month and includes all premium models plus voice chat. Lifetime is $149.99 as a one-time payment and lets you bring your own API keys. Visit the pricing page for current plan details.

Can I try the workspace before subscribing?

Yes. You can explore the interactive math visualization example without a subscription. After signing in, you can browse the workspace interface, but sending messages requires an active Pro or Lifetime plan.

Ready to get started

Own the keys. Use a finished multi-model workspace.

Pick Pro or Lifetime on the pricing page, then start with the model and tools your task needs.

Get startedView live demo