The best free AI assistant for Gmail is usually the one already switched on: Gmail's own Smart Compose and Smart Reply, plus whatever Gemini access your account happens to include. Everything past that is a trade. A third-party add-on buys you better drafting, summarising or triage, and it pays for that with an OAuth permission that can let a company you have never heard of read every email you have ever received. That trade is sometimes worth making. It is never worth making blindly.
Below: the free options that genuinely exist, what each does inside the Gmail window, and — the part the other listicles skip — how to read the permission screen before you click Allow.
The three layers of "AI in Gmail"
The phrase gets used for three different things, and the privacy consequences of each are wildly different.
- Native Google features. Smart Compose, Smart Reply, importance markers, nudges. Already in your account, no new permission, no third party.
- Gemini inside Google's own products. The "Help me write" button, refinement suggestions, thread summaries. Still Google, but availability moves between free and paid tiers constantly.
- Third-party add-ons and extensions. Anything from the Google Workspace Marketplace or the Chrome Web Store. This is where the real capability lives, and where the real exposure lives.
Most articles about the best free AI email assistant blur all three together. Keep them separate and the decision gets much easier.
Layer one: the free AI Gmail already has
Smart Compose finishes your sentences. Smart Reply offers one-tap responses. Nudges resurface threads you never answered. Importance markers do a rough triage.
None of this is exciting. It is also the highest ratio of usefulness to risk anywhere in your inbox, because there is no new party in the transaction. If you switched it off years ago because it felt intrusive, reconsider — the sentence completion has quietly become good. Where it stops: none of it understands a whole thread, and none of it drafts anything longer than a fragment.
Layer two: Gemini in Gmail, and where the free tier ends
Gemini appears as a "Help me write" option in the compose window, a refine/shorten menu on drafts, and — on some account types — a summarise control on long threads plus a side panel that can answer questions about your mail.
The honest state of play: Google keeps reshuffling which features sit in the free consumer tier versus a paid Google One or Workspace plan, and it has moved things in both directions. Rather than quote a tier breakdown that will be wrong within a quarter, check your own account: open a compose window, look for Help me write, then look top-right for a Gemini panel. What is there is what you have.
Who it suits: anyone whose problem is blank-page paralysis and who does not want to install anything.
Who it does not: anyone whose problem is volume. Gemini drafts. It does not chase your follow-ups or decide what you can ignore. If you get two hundred emails a day, a better drafting tool solves none of your actual problem — look at AI productivity tools built around triage instead, and the productivity stack rundown covers that ground properly.
Layer three: the third parties that are genuinely free
"Free" does a lot of work in most listings, so here is the plain version of each.
Grammarly
The free tier still works inside the Gmail compose window through the browser extension, and it is the most reliable free writing check most people will find. The generative features are increasingly gated behind paid plans, and what is included in free has been trimmed over time.
Who should use it: anyone whose emails are fine in substance and sloppy in execution. Who should not: anyone hoping it will write the email for them on the free tier. It will not, and the upsells are persistent.
Shortwave
A separate email client that sits on top of your Gmail account and adds AI search, summarisation and drafting. There is a free tier, and AI usage on it is capped rather than unlimited.
Who should use it: people genuinely willing to abandon the Gmail interface. That is the whole bet. Who should not: anyone who will drift back within a week. A client you do not open is not an assistant.
Lavender
Lavender is not a general inbox assistant — it is a coaching layer for outbound sales email. It scores your draft as you write and tells you why it is too long, too self-centred, or pitched at a reading level nobody will finish. It has historically offered a free individual tier; check what is current before building a workflow on it.
Who should use it: reps and founders doing their own outreach. Genuinely useful to sales teams, and it slots in beside the rest of the AI sales stack. Who should not: anyone who wanted help with their personal inbox. Lavender has an opinion about persuasion, not about your dentist appointment.
Apollo's Gmail extension
Apollo has a free plan and a Gmail extension that lets you sequence, track and enrich contacts from the compose window. The catch worth naming: the AI is not the point of Apollo — the B2B contact database is. And the tracking pixels that come with it are exactly the sort of thing that quietly damages deliverability, which we take apart in the cold email piece.
The paste-in workflow
Open a chat, paste the email, ask for a reply, paste it back. Unglamorous. Also the only approach here that grants nothing any access to your mailbox.
Who should use it: anyone whose hard emails number a handful a week, and anyone bound by a policy that makes mailbox-scope add-ons a non-starter. Who should not: high-volume inboxes. The copy-paste tax eats the saving.
Automation instead of an assistant
If the problem is sorting rather than writing, an automation layer beats an assistant. Zapier AI and Make can classify incoming mail, label it, route it to a task manager, or write a draft reply for you to approve. Every step is visible and auditable, which is more than can be said for most add-ons.
The options side by side
| Option | What it does inside Gmail | Free tier reality | Access it wants |
|---|---|---|---|
| Smart Compose / Smart Reply | Sentence completion, one-tap replies | Included with Gmail | None beyond Google |
| Gemini in Gmail | Draft, refine, summarise (tier-dependent) | Partly free, partly paid; changes often | None beyond Google |
| Grammarly | Inline correctness and tone in compose | Free tier real, generative features gated | Browser extension on mail.google.com |
| Shortwave | Replaces the client; AI search and summaries | Free tier with capped AI usage | Full mailbox connection |
| Lavender | Real-time coaching on outbound sales email | Free individual tier, historically | Compose-window access |
| Apollo extension | Sequencing, tracking, contact enrichment | Free plan available | Mailbox and contact scopes |
| Paste-in chatbot | Whatever you ask, one email at a time | Free tiers, rate-limited | Nothing |
| Zapier AI / Make | Classify, label, route, draft | Free tiers with task limits | Scoped Gmail permissions |
Swipe the table sideways to see every column →
The privacy trade nobody puts in the listicle
Here is the sentence that belongs in every article like this and appears in almost none of them: a Gmail add-on granted the full mailbox scope can read, send and permanently delete every email in your account, including the ones you have not received yet.
Google's consent screen is unusually honest about this if you actually read it. The wording maps directly to the scope being requested:
- "Read, compose, send, and permanently delete all your email from Gmail" — the full mailbox scope. It is total.
- "Read all your email" — read-only across the whole mailbox. Still total, in the way that matters.
- "Manage drafts and send emails" — compose scope. The app can create and send mail but cannot read your existing inbox.
- "View the email messages when the add-on is running" — the narrowest useful one. The add-on sees only the message you have open.
A writing assistant needs the compose scope. If it is asking for permanent-delete rights over your entire mail history, the burden of explanation sits with the vendor, not with you.
How to check before you click Allow
- Read the consent screen, not the marketing site. The Allow button sits directly under the true list of permissions. That list is the contract.
- Look for the word "all". "All your email" and "permanently delete" are the two phrases that should stop you.
- Find the privacy policy on the Marketplace listing. If there isn't one, or it resolves to a page with no company name on it, that is your answer.
- Treat an "unverified app" warning as a hard no. Apps requesting Google's sensitive and restricted scopes are meant to pass verification, and restricted scopes carry an ongoing independent security assessment requirement. An app routing around that is asking you to skip a check built for exactly this situation.
- Ask what the business model is. A free product holding full mailbox scope is being paid for by something.
- Remember extensions are separate. A Chrome extension with host access to Gmail never appears in your Google permissions list — it reads the page directly. Different mechanism, same exposure.
Revoking access
Open your Google Account's security settings and find the third-party apps list. Every app you have granted a Gmail scope to is there, with what it can see. Remove anything you cannot name from memory — the list is always longer than people expect. On Google Workspace, an admin can restrict Marketplace installs to an allowlist. Most organisations should turn that on. Most have not.
A ten-minute setup worth doing
- Turn Smart Compose and Smart Reply back on. Give them a week.
- Audit your existing Gmail permissions and revoke the ones you do not recognise.
- Pick exactly one third-party tool, chosen for the layer where you actually lose time — writing, sorting, or outbound.
- Before installing, read the scope line aloud. If you would not hand a stranger a printout of your inbox, do not grant the full mailbox scope.
- If the real problem is that you write the same email forty times a month, stop shopping and write five templates. Unfashionable; frequently correct.
FAQ
Is Gemini free in Gmail?
Partly. Some Gemini-powered features have been available on free consumer accounts, while deeper capabilities such as long-thread summarisation and the full side panel have generally been tied to paid Google One or Workspace tiers. Google moves those boundaries regularly, so the reliable check is to open a compose window in your own account and see which controls appear.
Is there a free AI email assistant that does not read my inbox?
Yes — the paste-in workflow. Using ChatGPT or Claude in a separate tab and copying the email across grants no mailbox access at all. It is slower per email, but for anyone sending a handful of difficult emails a week rather than a hundred routine ones, it is comfortably the best privacy-to-value trade available.
Can an AI assistant reply to my emails automatically?
Technically yes, and several tools offer it. It is a bad idea for anything beyond trivial acknowledgements. An auto-reply that confidently agrees to something you did not agree to is a problem you cannot un-send. Use draft-and-approve instead: let the tool write into your drafts folder and press send yourself.
How do I remove a Gmail AI add-on's access?
Open your Google Account, go to security, and find the list of third-party apps with account access. Each entry shows exactly what the app can see, and you can revoke it there. A Chrome extension is separate — remove it from your browser's extensions page, not from your Google account.
Are these tools safe to use on work email?
That is not your call to make alone. Work mail is usually covered by a data-processing agreement and an acceptable-use policy, and installing a mailbox-scope add-on can breach both. Ask your admin. If the restriction on Marketplace installs is already switched on, the question has answered itself.
Where to go next
To see the whole field rather than the free corner of it, browse AI email tools or filter the directory down to free tools. And if you run a genuinely free Gmail assistant we have missed, submit it — the useful ones are usually the ones nobody is advertising.
