The Mailstrom Insider’s Guide
Everything we know about Mailstrom in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Mailstrom
The Insider’s Guide
Web-based inbox cleaner for bulk deleting and unsubscribing
Every plan, grade, refund rule and rival among email apps, read from Mailstrom’s own pages.
Made by 410 Labs · checked Oct 9, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Mailstrom’s own pages, its app-store listings and our grades. Every fact in it is on Mailstrom’s page too, where it is kept up to date. Checked Oct 9, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.2
GPA, above 9 of the 51 other email apps we grade
Mailstrom is a web-based inbox cleaning tool from 410 Labs that connects to an existing mailbox over IMAP. It groups messages into bundles by sender, subject, date or size so that hundreds or thousands can be deleted, archived or moved at once, and it adds unsubscribe, block and automatic rules to keep the inbox clear afterwards. It works with Gmail, Outlook, Yahoo, AOL, iCloud and other providers that support IMAP.
To get you started, here are 9 things to know about Mailstrom, taken from its own pages and our grades.
- 1
Best for bulk-clearing an inbox you gave up on
Mailstrom bundles your mail by sender, subject, date or size, so you can delete or archive hundreds of messages in one go, then unsubscribe and block so they don't come back.
- 2
Paid plans start at $5 a month when paid by the year
As its pricing page puts it: $9 per month, or $59.95 per year (Basic, 1 email account).
- 3
You can try it first
Free trial, no credit card: a snapshot of up to 5,000 inbox messages, of which 25% can be deleted, archived or moved
- 4
It runs on Web
Web.
- 5
Bundles of related mail
Groups inbox messages by sender, subject, date and size so that tens, hundreds or thousands of them can be deleted, archived or moved to a folder in one action.
- 6
Unsubscribe
From the Mailing Lists tab, Unsubscribe sends a request email to the list owner. If the list gives no unsubscribe address, its web page opens in a new tab instead.
- 7
Block
Removes the selected messages and creates a rule that keeps future mail from the same sender, mailing list or subject out of the inbox. Available to subscribers.
- 8
A 2.2 GPA, above 9 of 51
That is against the other email apps we grade, on value, the free plan, features, ease of use and platforms.
- 9
Keep it
To replace Mailstrom you would be making connections to other products, each kept working as those products change. That is not a weekend's work, with an AI app builder or without one.
Mailstrom at a glance
- Pricing
- Free trial, from $9 per month, or $59.95 per year (Basic, 1 email account)
- Free plan
- No
- Free trial
- Free trial, no credit card: a snapshot of up to 5,000 inbox messages, of which 25% can be deleted, archived or moved
- Runs on
- Web
- Made by
- 410 Labs
- Category
- Email Apps
- Our grade
- 2.2 GPA, fair
The report card
Best for bulk-clearing an inbox you gave up on
Mailstrom bundles your mail by sender, subject, date or size, so you can delete or archive hundreds of messages in one go, then unsubscribe and block so they don't come back. Basic is $9 a month for 1 account and 10,000 emails. It runs in the browser only, the free trial lets you act on a quarter of a 5,000-message snapshot, it can only organize the inbox, and POP-only accounts can't connect.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | Basic is $9 a month, the middle of this category, or $59.95 a year, about $5 a month. That covers 1 email account and up to 10,000 emails. A second mailbox or a bigger one means Plus at $14 a month, and Pro is $29.95. |
| Free plan and trial | C | No free plan. The trial needs no credit card, but it's a one-time snapshot of up to 5,000 inbox messages and only 25% of them can be deleted, archived or moved. Enough to see how it works, not enough to finish the job. |
| Features | C | It does its one job: bundles by sender, subject, date and size so thousands of messages move at once, with Unsubscribe, Block, Chill, Expire, saved move rules and an Undo for every command. That's a narrow slice of email, and the FAQ says folders other than the inbox can't be organized yet. |
| Ease of use | C | No rating on record. Bundles are simple to read and Undo reverses mistakes, but you start by connecting a mailbox over IMAP, and POP-only accounts or Exchange servers without IMAP can't be connected at all. |
| Platforms and integrations | B | The browser and nothing else: no phone or desktop app is listed. It connects to Gmail, Outlook, Yahoo, AOL, iCloud, Microsoft 365 and other IMAP providers. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Mailstrom is for
- Fits if your inbox holds thousands of old messages you want to delete or archive in bulk
- Works for people who'd rather choose what goes themselves than leave it to AI sorting
Who it is not for
- Skip it if you want to tidy your other folders too, because only the inbox can be organized for now
- Tight if you're on Basic with a big mailbox, as it's capped at 1 email account and 10,000 emails
- Not for you if you want an app on your phone, since it runs in the browser only
- Watch out: the free trial is a one-off snapshot of 5,000 messages, and you can act on only 25% of them
- Skip it if your mail is POP-only or on Exchange without IMAP, as those can't be connected
Good to know
Good for
- Clearing thousands of old messages out of a neglected inbox
- People who want to choose what goes themselves instead of relying on AI sorting
- Cleaning several mailboxes: Pro covers 20 email accounts
Worth knowing
- It runs in the browser only; the site lists no mobile or desktop apps.
- The free trial is a one-time snapshot of up to 5,000 messages, and only 25% of them can be deleted, archived or moved.
- It works over IMAP, so POP-only accounts and Exchange servers without IMAP enabled cannot be connected.
- Basic is capped at 1 email account and 10,000 emails, and the FAQ says folders other than the inbox cannot be organized yet.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$5
A month to start, paid by the year
Mailstrom is a paid product with a free trial, starting at $9 per month, or $59.95 per year (Basic, 1 email account).
Enough to see how it works, not enough to finish the job.
Basic
$9
per month, or $59.95 per year
1 email account with up to 10,000 emails, 200 smart filters, unlimited email removal, and Chill, Expire and Block.
Plus
$14
per month, or $99.95 per year
3 email accounts with up to 250,000 emails and 400 smart filters.
Pro
$29.95
per month, or $199.95 per year
20 email accounts with unlimited inbox size and 1,000 smart filters.
Trying it first
Free trial, no credit card: a snapshot of up to 5,000 inbox messages, of which 25% can be deleted, archived or moved
Read from mailstrom.co on Oct 9, 2026.
Ways to pay less
Annual discount
Annual plans are marked as saving 40%
The subscribe page labels annual billing as saving 40%: Basic is $59.95 a year against $9 a month, Plus $99.95 against $14 and Pro $199.95 against $29.95.
Stated on mailstrom.co
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Web-based inbox cleaner for bulk deleting and unsubscribing. Here is what it does, as its own site describes it, and what it covers: inbox filtering, workflow automation.
That's a narrow slice of email, and the FAQ says folders other than the inbox can't be organized yet.
- Bundles of related mail
- Groups inbox messages by sender, subject, date and size so that tens, hundreds or thousands of them can be deleted, archived or moved to a folder in one action.
- Unsubscribe
- From the Mailing Lists tab, Unsubscribe sends a request email to the list owner. If the list gives no unsubscribe address, its web page opens in a new tab instead.
- Block
- Removes the selected messages and creates a rule that keeps future mail from the same sender, mailing list or subject out of the inbox. Available to subscribers.
- Chill and Expire
- Chill takes messages out of the inbox and returns them on a date you choose. Expire removes mail from a sender or mailing list after a set period. Both need a subscription.
- Automatic move rules
- A move can be saved as a rule, so future messages that match a sender or subject are filed into the chosen folder as they arrive. Subscribers' mail is loaded continuously.
- Undo and task history
- Actions are carried out by your email service and are not permanent: deleted mail goes to its trash, and an Undo feature reverses any command from the task list.
Where it runs
- Web
What it works with
- Gmail
- Outlook
- Yahoo Mail
- AOL
- iCloud
- Microsoft 365
Mailstrom is made by 410 Labs.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
9/51
Other email apps it is graded above
Mailstrom's GPA of 2.2 is higher than 9 of the 51 other email apps we grade, and level with 9.
It stands best on platforms and integrations (B, above 15 of 51) and worst on features (C, above 0).
Its paid plans start at $5 a month when paid by the year, against a middle price of $4.99 for the category: 24 of the 45 others that charge start lower.
On features, ease of use and platforms it scores 2.3 out of 4. 16 tools score higher and cost less.
Each grade against the category
Every bar is all 52 email apps we grade, cut by the letter each got. Mailstrom’s own letter is outlined.
- CValue for moneyAbove 11 of 51
- CFree plan and trialAbove 4 of 51
- CFeaturesAbove 0 of 51
- CEase of useAbove 0 of 51
- BPlatforms and integrationsAbove 15 of 51
Price against what you get
Each dot is one of 50 email apps. Further left costs less; higher up scores better on features, ease of use and platforms. Mailstrom is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace Mailstrom you would be making connections to other products, each kept working as those products change. That is not a weekend's work, with an AI app builder or without one.
That makes this kind of software worth paying for, not this one in particular: 33 of the 51 other email apps grade higher. It costs $59.95 a year.
What you could not
- Connections to other products, each kept working as those products change.
- Filters that read every message as it arrives.
What this rests on. Mailstrom’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Clean Email, Unroll.Me, Leave Me Alone, SaneBox and Inbox Zero
The 5 tools Mailstrom is most often weighed against, with where each one differs from it.
- 2.2GPA
Clean Email
Free plan · from $9.99/mo
Inbox cleaner for bulk deleting, unsubscribing and auto rules.
- Clean Email has a free plan. Mailstrom does not, though it has a free trial.
- Only Clean Email lists iOS, macOS and Android apps.
- 3.2GPA
Unroll.Me
Free
Free tool to block or roll up subscription emails.
- Unroll.Me has a free plan. Mailstrom does not, though it has a free trial.
- Only Unroll.Me lists iOS and Android apps.
- 2.2GPA
Leave Me Alone
Free trial · from $9/mo
Unsubscribe from mailing lists and screen unwanted senders.
- 2.2GPA
SaneBox
Free trial · from $6.99/mo
AI email filtering that works inside the email app you already use.
- Only SaneBox lists iOS and Android apps.
- 2.0GPA
Inbox Zero
Free trial · from $18/mo
Open source AI email assistant for Gmail and Outlook.
- Only Inbox Zero lists macOS, Windows, iOS and Android apps.
- Only Inbox Zero lists a browser extension.
- Inbox Zero is open source and self-hostable, according to its own site.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
13
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Mailstrom free?
No, Mailstrom is a paid product, but you can try it first. Free trial, no credit card: a snapshot of up to 5,000 inbox messages, of which 25% can be deleted, archived or moved.
How much does Mailstrom cost?
Mailstrom lists 3 plans. Basic: $9 per month, or $59.95 per year.
What platforms does Mailstrom work on?
Mailstrom is available on Web.
Does Mailstrom offer any discounts?
Mailstrom publicly lists the following: Annual plans are marked as saving 40%.
Does Mailstrom have an Android app?
No Android app was listed when its pages were read on Oct 9, 2026. Mailstrom is listed for Web.
Does Mailstrom have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. Mailstrom is listed for Web.
Is Mailstrom open source?
Mailstrom is not described as open source on its own site, as read on Oct 9, 2026.
What does Mailstrom integrate with?
Mailstrom's listing names Gmail, Outlook, Yahoo Mail, AOL, iCloud and Microsoft 365.
Who makes Mailstrom?
Mailstrom is made by 410 Labs.
What are the alternatives to Mailstrom?
The closest alternatives to Mailstrom in our directory are Clean Email, Unroll.Me, Leave Me Alone, SaneBox and Inbox Zero.
How does Mailstrom compare with other email apps?
Mailstrom's GPA of 2.2 is higher than 9 of the 51 other email apps we grade, and level with 9.
Is Mailstrom good value for money?
ToolGPA grades Mailstrom C for value for money. Its paid plans start at $5 a month when paid by the year, against a middle price of $4.99 for the category: 24 of the 45 others that charge start lower.
Could I make my own version of Mailstrom?
To replace Mailstrom you would be making connections to other products, each kept working as those products change.
Where this guide comes from
The prices, plans, platforms and features were read from Mailstrom’s own pages on Oct 9, 2026, and the grades were given on Oct 10, 2026. Graded from this listing, whose facts were read from Mailstrom's own pages on 9 October 2026. Also tested with a demo account on 2026-09-28.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by 410 Labs. Prices change, so check mailstrom.co before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
3,189
Tools graded, in 94 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
3,189
tools graded
94
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Mailstrom, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/mailstrom
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Mailstrom: The Insider's Guide", checked Oct 9, 2026. https://toolgpa.com/tools/mailstrom
Know someone choosing between email apps?
Send them this guide: toolgpa.com/tools/mailstrom/guide
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See our other guides
The best-graded email apps after Mailstrom, each with an Insider's Guide of its own.
- Email Apps Insider's GuideEvery one of the 52 email apps we grade, compared
- Microsoft Outlook Insider's GuideMicrosoft's email and calendar app for desktop, mobile and web3.6 GPA
- BlueMail Insider's GuideCross-platform email client with a unified inbox and built-in AI3.2 GPA
- Thunderbird Insider's GuideFree, open-source email app for Windows, macOS, Linux and Android3.2 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Mailstrom’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Mailstrom is a trademark of its owner, and this guide is not made, paid for or approved by 410 Labs. Prices and plans change: check mailstrom.co before you buy.