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GPT for Gmail™ and Outlook™ vs Mailr. Side by side.

Compare pricing, strengths, and use cases so it is easier to pick the right fit.

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GPT for Gmail™ and Outlook™

Mailr

Best overall

For most everyday users, Mailr wins on sheer ease and affordability—its persona mimicry and lightweight design make it a joy for quick replies. GPT for Gmail and Outlook is the power pick if you need bulk email processing, top-tier privacy with your own API key, or consistent access to the latest models, but its credit system and desktop-only nature make it less beginner-friendly.

GPT for Gmail™ and Outlook™

Credit packs from $29 (one-time), free credits to start #2030 of 3,826 Web

Mailr

#2169 of 3,826 Web

Scores at a glance

GPT for Gmail™ and Outlook™MailrPractical Versatility

Onboarding Ease

Ecosystem Fit

Market Value

Choose GPT for Gmail™ and Outlook™ if

You send personalized bulk emails (e.g., newsletters, sales outreach) and want to automate them via Google Sheets
You handle long, complex email threads daily and need instant summaries
Privacy is a top concern—you want to use your own OpenAI API key so no third party stores your data
You're comfortable with a credit-based pricing model and don't mind a desktop-only tool

Choose Mailr if

You want the AI to sound exactly like you—just feed it a few sample emails and it mimics your tone
You're a casual email user who writes a few replies a day and wants a simple, affordable assistant
You hate complicated setups and want to be up and running in under 5 minutes
You prefer a lightweight browser extension that doesn't clutter your interface

Key differences

Mailr learns your writing style from samples; GPT for Gmail uses a persona profile you configure manually.
GPT for Gmail can bulk-process emails via Google Sheets; Mailr cannot.
Mailr has a free tier (low word count); GPT for Gmail gives free credits but then requires paid credit packs or your own API key.
GPT for Gmail lets you bring your own OpenAI API key for privacy; Mailr does not offer BYOK.
Both lack mobile apps, but Mailr's extension is lighter and less intrusive.
Mailr's pricing is simpler and cheaper for individual use; GPT for Gmail's credit system is better for heavy users who buy in bulk.

Facts side by side

	GPT for Gmail™ and Outlook™	Mailr
Free plan
Mobile app
API access

GPT for Gmail™ and Outlook™: strengths & weaknesses

Bulk email drafting from Google Sheets is a huge time-saver for mass outreach
Summarizes long email threads in seconds, saving you from reading walls of text
Lets you bring your own OpenAI API key for maximum privacy and no credit limits
Supports multiple languages and sentiment analysis for professional communication
Credit pack system is confusing—you buy credits but they expire, and it's not clear how much each action costs
No mobile app at all, so you can only use it on a desktop browser
Sidebar can lag when you have many Outlook folders open
Requires an internet connection and depends on OpenAI's servers being up

Mailr: strengths & weaknesses

Persona mimicry is excellent—you give it a few of your old emails and it writes drafts that sound like you
Very lightweight browser extension, doesn't slow down Gmail or Outlook
Reliable thread summarization even for very long conversations
Affordable premium tier compared to most AI writing tools
Free tier has a low word count limit, so you'll hit the cap quickly if you write long emails
No native mobile app—works only in desktop browsers
Requires constant internet connection; no offline mode
Limited integrations beyond basic Gmail/Outlook (no Sheets, no CRM sync out of the box)

Common questions

Is GPT for Gmail and Outlook better than Mailr for summarizing long email threads?

Both are excellent at summarization, but GPT for Gmail handles extremely long threads more reliably because it uses the latest OpenAI models. Mailr is slightly faster for short threads but may truncate very long ones.

Can I use these tools on my phone?

No—neither tool has a mobile app. Both are browser extensions that work only on desktop versions of Gmail or Outlook. If you need mobile email AI, look for a different tool.

Which tool is cheaper for a single person writing 10 emails a day?

Mailr is cheaper for light use—its premium tier is very affordable. GPT for Gmail's credit packs start at $29, which is overkill if you only write a few emails daily. For heavy use (50+ emails/day), GPT for Gmail with your own API key can be cheaper per email.

Does GPT for Gmail work with Microsoft Outlook?

Yes, it works with both Gmail and Outlook (via browser extension). Mailr also works with both. Both require you to grant OAuth2 access to read and write emails.

Which tool is more private?

GPT for Gmail is more private if you bring your own OpenAI API key—your data goes directly to OpenAI and isn't stored by the extension provider. Mailr processes your emails through its own servers, so your data is handled by Mailr's infrastructure.

Can I use these tools to write emails in a different language?

Yes, both support multilingual translation. GPT for Gmail has a dedicated translation feature with sentiment analysis. Mailr can translate as part of its drafting, but it's less explicit about language support.

Mailr is the friendlier, cheaper pick for everyday email help; GPT for Gmail and Outlook is the heavy lifter for bulk work and privacy-conscious pros.

If you just want an AI that writes emails that sound like you, without any fuss, go with Mailr—it's cheaper, easier, and gets out of your way. If you're a power user sending mass emails or need top-tier privacy with your own API key, GPT for Gmail and Outlook is the better investment, despite the clunky credit system.

Visit GPT for Gmail™ and Outlook™ Visit Mailr

Detail pages: GPT for Gmail™ and Outlook™ · Mailr

GPT for Gmail™ and Outlook™

Mailr

Free plan

Mobile app

API access