Now in beta · works inside Gmail

Your inbox, finally on autopilot.

Other AI tools help you read your inbox. Sylvia helps you act on it. Just type what you want — archive, label, clean up, or reply in bulk — and Sylvia does it for you, always asking before it acts.

Add to Chrome — free See how it works
No API key needed · or bring your own OpenAI, Gemini or Azure key
mail.google.com
SR
Invoice Stripe Receipts
Your monthly statement is ready
10:42
LA
Newsletter Lena Aoki
Weekly product digest — issue #42
09:18
MK
Marcus Köhler
Quick question about the design review tomorrow
Yest
AT
Invoice AWS Billing
Amazon Web Services — June statement
Mon
S
Sylvia AI email assistant
Label every invoice from this month as "Accounting".
Found 14 emails matching invoices in June. Apply label Accounting to all?

Reply yes to confirm.
yes
Done. 14 emails labelled. ✓
Ask Sylvia… ↑
What Sylvia does

Built for action, not just answers.

Sylvia understands plain English, plans actions across your inbox, and executes them only after you confirm. No commands to memorise. While other assistants explain your emails, Sylvia manages them.

Natural-language search

"Find emails from my landlord about the lease, sent before March." Sylvia builds the Gmail query and surfaces matching threads in seconds.

Smart labelling

Auto-tag invoices, newsletters, receipts or anything you describe. Sylvia learns the pattern and applies labels in bulk.

Thread summaries

Long back-and-forth? Ask "summarise this thread" and get the gist, decisions made, and what's pending.

Drafted replies

Sylvia drafts polished replies in your tone. Review and send — or ask her to redo with different framing.

Bulk cleanup

Archive, trash, or move hundreds of emails in one go. Sylvia previews exactly what will change before doing anything.

Confirms before acting

Destructive actions always show a clear preview — count, scope, what will happen — and wait for your "yes".

How it works

Three steps. No setup pain.

Sylvia runs entirely in your browser. You bring your own AI key, you stay in control.

1

Install the extension

Add Sylvia from the Chrome Web Store. Sign in with your Google account so she can read and act on your Gmail.

2

Pick your AI

Use the built-in Sylvia plan (powered by Cerebras, no key needed), or bring your own OpenAI, Gemini or Azure key stored locally in your browser.

3

Open Gmail and chat

Sylvia appears as a sidebar inside Gmail. Type what you want — she plans, asks, and executes.

Try saying

Plain English, real actions.

Sylvia turns instructions into safe, reviewable Gmail operations.

Archive all newsletters older than two weeks
Sylvia finds matching threads, shows the count, and archives them only after you say yes.
Summarise unread emails from my team this morning
A concise digest with sender, topic, and what (if anything) needs a reply from you.
Draft a polite decline to the meeting from Marcus
A reply in your tone, ready to review and send — or to revise with another instruction.
Label every email mentioning "contract" as Legal
Sylvia searches the body, shows matches first, then applies the label in bulk.
Find the invoice from AWS for May
Sylvia narrows by sender and date, then opens the matching thread directly in Gmail.
Clean up everything from no-reply addresses in promotions
A preview of exactly which threads will move to trash — nothing happens without confirmation.
Simple pricing

Start free. Pay only for what you use.

The Sylvia plan is hosted by us — no API key needed, no monthly subscription. Buy replies when you need them. They never expire.

Sylvia plan
$3
50 AI replies · never expire
  • No API key required
  • Replies in seconds — one of the fastest AI models available
  • Works instantly, no setup needed
  • Top up anytime · $9 for 200 · $20 for 500
Get started
Most popular
Sylvia plan
$9
200 AI replies · never expire
  • No API key required
  • Replies in seconds — one of the fastest AI models available
  • Works instantly out of the box
  • Best value for regular users
Get started
BYO API key
Free
Unlimited · your own cost
  • Use your own OpenAI, Gemini or Azure key
  • Full control over model and spend
  • Great for developers and power users
  • Keys stored locally — never leave your browser
Get started free
GPT-5.6

Latest OpenAI reasoning models — Sol for planning, Luna for execution and replies

3-stage

Planner → Executor → Analyzer pipeline with smart retries at each step

0 setup

No API accounts, no billing, no keys to manage

Built with privacy first

Your data stays yours.

Sylvia is built to handle your email with the minimum footprint necessary. No training on your data, no persistent storage of email content.

BYO key: local only When you use your own API key it is stored in Chrome's secure storage and calls go directly from your browser to OpenAI, Gemini or Azure — we never see them.
Sylvia plan: minimal proxy Your request is forwarded through our server to OpenAI. We log only aggregate usage counts — no email content is stored.
No email storage Sylvia never persists your email content. Each session is fresh.
You confirm every action Destructive operations always preview their scope and require your approval.

Ready to take your inbox back?

Add Sylvia to Chrome and start chatting with your Gmail in under a minute.

Add to Chrome — free