# Change AI language & tone

Use the **`Settings`** → **`Language`** screen to control both the app's interface language and the language Filo uses for Summaries & To-dos. Tone lives in the AI prompt.

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### 1 · App interface language

1. Open **`Settings`** → **`Language`**  
2. Tap **App** → choose **System** (follow device) or select a language from the list  
3. Relaunch Filo if the UI doesn't refresh right away

### 2 · Summary & To-do language

1. Still in **`Settings`** → **`Language`**  
2. Tap **Summary & To-do**  
3. Pick **Auto** (mirror the App/System language) **or** choose a specific language  
4. All new Summaries and To-dos will now appear in that language; existing ones stay as-is

**Tip:** Keep **Auto** on to prioritize Summary & To-do output in your current device language.

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### 3 · Adjust the tone

1. Go to **`Settings`** → **`Customize AI`**  
2. In the single **Custom Prompt** box, add tone guidance, e.g.

Summaries: 1-2 sentences, neutral.

Drafts & Quick Replies: friendly business tone, <120 words.

3. Tap **Save**—every future Summary, Draft, and Quick Reply will follow the new style

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#### Notes & Tips

- **Interface vs. AI output** — You can run Filo in English but have summaries returned in Japanese, or vice versa.
- **Custom Prompt scope** — One prompt governs tone everywhere (Summaries, Drafts, Quick Replies).
- **Language coverage** — Current options include English, 简体中文, 繁體中文, 日本語, Français, Italiano, Deutsch, Español, Português, Русский, हिन्दी, 한국어, العربية.