Free-tier power-up

Get a Gemini API key for yukoe.

One key adds Gemini translation and Talk with AI. Create it in Google AI Studio, store it only in yukoe, and verify it privately before a stream.

Open Google AI Studio ↗ Follow the four steps ↓
Free tierAvailable for supported models with changing project limits.
One keyGemini translation plus AI language commands.
Local vaultProtected for your Windows user with DPAPI.
Before you create it

Free is useful — and has a privacy tradeoff.

Google currently offers a free Gemini Developer API tier. Limits and eligible models can change, so this guide links to the live pricing page instead of freezing a quota number.

You need

  • A Google account that can use Google AI Studio.
  • A Google Cloud project. AI Studio can create a default one for a new user after Terms acceptance.
  • The normal yukoe Windows app open at Settings → API & Services.
Four short steps

Create, paste, restart, verify.

Never paste the key into this website, Twitch chat, a screenshot, or a source file.

01

Open the API Keys page

Sign in to Google AI Studio and accept the terms if prompted. New users may see a default project and key; existing Cloud users may need to import a project first.

  1. Open Dashboard → Projects if your intended project is missing.
  2. Choose Import projects, select the project, then return to API Keys.
Read Google's current key guide ↗
02

Create a new auth key

Choose Create API key in the project you want yukoe to use, then copy the new value once.

  1. New AI Studio keys are authorization keys and are restricted to the Gemini API by default.
  2. If an older key says Standard or Unrestricted, create a fresh auth key instead. Google says Standard keys stop working with Gemini in September 2026.
03

Save it only inside yukoe

In yukoe, open Settings → API & Services → Gemini and AI fallback.

  1. Paste the value into Gemini API key. Leave DeepSeek empty unless you deliberately want that separate fallback.
  2. Choose Save securely and restart. yukoe writes the secret directly to your current-user Windows DPAPI vault.
  3. After restart, the field shows only that a key is configured; yukoe never displays the saved value back.
04

Verify it without posting to Twitch

Return to API & Services and confirm Gemini says Ready.

  1. Keep Viewer delivery private.
  2. Use the Translation Lab or Local workspace for one ordinary English/Japanese message.
  3. Confirm a Gemini result appears, then try one Talk with AI command if you plan to use it live.
If it does not work

Fix the first failed checkpoint.

Create button unavailable

Your organization may not grant the required project, API key, service-usage, or service-account permissions. Import a project you control or ask its administrator.

Key rejected

Create a new auth key in AI Studio. Do not reuse an unrestricted Standard key, and make sure you copied the entire new value without spaces.

Quota or rate limit

Check the selected model, project quota, and current pricing page. Free limits can change; yukoe can continue with another configured translation provider.