Best AI Email Assistant for Gmail (Free, Private)
By Biilda Team · · 5 min read
The best AI email assistant for Gmail depends on three things: whether it only drafts or also acts, where your mail is processed, and how you pay. There is no single winner, so here is the short version.
| If you want | Look at | Trade-off |
|---|---|---|
| Help writing and summarising inside Gmail | Gemini in Gmail, Shortwave, Superhuman | You stay at the keyboard; it assists rather than works alone |
| A full email client with AI built in | Shortwave, Superhuman | You switch inbox apps; subscription pricing |
| An agent that works on a schedule across Gmail and Slack | Biilda, Lindy | It acts on its own, so you need approvals and a spend cap |
Below is how each group works, what the free options cost you, and how to set up a Gmail agent in Biilda.
What an AI email assistant does
At minimum it summarises long threads and drafts replies. Better ones sort the inbox, flag what needs you today, schedule meetings and follow up when someone has not replied. The most capable can act without you opening the app: a morning routine that reads new mail, drafts answers and posts a summary to Slack.
Inbox add-ons vs AI agents
Inbox-native tools live where you read mail. Gemini in Gmail, per Google's Workspace page, summarises threads, finds key details and drafts emails, and it is included in Business Standard and higher Workspace plans. Shortwave is an AI email client that organises your inbox, writes in your voice and offers plain-English filters, with a free plan. Superhuman pairs email with an AI writing assistant and follow-up reminders.
These are assistants: you are in the driver's seat. They are a good fit if your bottleneck is writing and reading speed.
AI agents take a standing job and do it while you are elsewhere. Lindy describes an AI employee that works across more than 1,000 tools with scheduled automation, and Biilda is a desktop app where you describe the agent in chat. The difference between the two categories is covered in AI agent vs AI assistant vs chatbot.
Free options and their limits
Free tiers exist, with limits. Shortwave lists a free plan with no credit card required. Lindy lists a free trial of $50 in credits, not a permanent free tier. Gemini in Gmail is part of paid Workspace plans. Biilda is free to download, and you then pay only for the AI work you run, from a $20 credit pack, with no subscription.
The honest rule: "free" usually means a capped tier or a trial. Check what happens at the limit, and whether the work you care about is inside it.
Privacy: where is your email processed?
This is the question that matters most with mail, because your inbox holds customer details, invoices and private conversations.
Ask any tool: where is my data stored, what exactly gets sent out, where are my credentials kept, and can I revoke access? Cloud tools process your mail on their servers. Lindy states it is SOC 2 Type II compliant and that data is not trained on external models, which is worth checking for any vendor.
Biilda is local-first: your workflows, connections and history stay on your computer, credentials for connected accounts are stored securely on your machine, and only what an AI request needs leaves it. That does not make the others unsafe. It is a different trade-off, covered in local-first AI. The constraint on the local side is that the app must be running for schedules to fire.
Approval before sending
Reading and drafting are low risk. Sending under your name is not. Whatever tool you pick, keep a human check on outbound mail until you have read many good drafts. Lindy notes it requires approval for write and send actions. In Biilda, new employees ask before outward actions, unattended requests appear in an Approvals queue, and you can stop any task mid-run.
Can AI reply automatically? Technically yes. Sensibly, only after a trial period and only for routine messages.
How to set up a Gmail agent in Biilda
- Install Biilda (Windows or macOS) and open the chat.
- Ask it to connect Gmail and follow the guided setup.
- Describe the job: "Every weekday at 7:30, read my unread email, list what needs a reply today and post a five-line summary to Slack."
- Review the plan before anything is built. A new employee starts switched off until you turn it on.
- Run it on demand, read the output, refine the instruction, then schedule it.
- Add drafted replies later, with approval on before anything is sent.
A related walkthrough is in how to connect Gmail and Slack to your AI employees. For the wider picture, see what AI can do for a small business.
FAQ
Is there a free AI email assistant for Gmail?
Yes, with limits. Shortwave has a free plan, Lindy offers a free trial, and Gemini in Gmail requires a paid Workspace plan. Biilda is free to download and charges only for the AI work you run.
Can AI reply to my emails automatically?
It can, but it is safest to start with drafts you approve. Once the drafts are consistently good for routine questions, you can decide whether to loosen approval for those messages. Keep it on for anything that commits you to money or a promise.
Is it safe to give AI access to my Gmail?
It is a real trade-off. Connect only what the job needs, start with read-only jobs like summaries, keep approval on before anything is sent, and prefer tools that let you revoke access. A local-first tool keeps credentials on your own machine.
Sources
Checked on 2026-09-30: Google Workspace AI, Shortwave, Superhuman, Lindy. Features and pricing change, so confirm on each vendor's own page before you buy.
Try it
If you want an agent that works on your inbox while you do something else, download Biilda for free.