The AtomicMail Insider’s Guide
Everything we know about AtomicMail 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.
AtomicMail
The Insider’s Guide
Encrypted email with a free plan and custom-domain business plans
Every plan, grade, refund rule and rival among email apps, read from AtomicMail’s own pages.
Made by AtomicMail Systems OÜ · checked Nov 13, 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 AtomicMail’s own pages, its app-store listings and our grades. Every fact in it is on AtomicMail’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
3.0
GPA, above 100 of the 122 other email apps we grade
Atomic Mail is an email service that says it uses end-to-end and zero-access encryption and lets people sign up without a phone number. Personal accounts live on atomicmail.io, and business plans put a team on its own domain. It has apps for desktop and mobile as well as a web app.
To get you started, here are 9 things to know about AtomicMail, taken from its own pages and our grades.
You set up a recovery seed phrase and your own aliases, and a lost phrase is yours to deal with.
- 1
Best for encrypted email with a free plan
AtomicMail is encrypted email with a free plan that has unlimited storage and 10 aliases, and paid plans from $3 a user a month.
- 2
Paid plans start at $3 a month for each person
As its pricing page puts it: $3 per user / month (Business Starter, billing basis not stated).
- 3
There is a free plan
Encrypted email on atomicmail.io with unlimited storage, 10 aliases and recovery by seed phrase.
- 4
It runs on 6 platforms
Web, Windows, macOS, Linux, iOS and Android.
- 5
Encryption
Messages between Atomic users use ECIES encryption; mail to other providers can be encrypted with a password or as a file. The vendor says it cannot read encrypted content.
- 6
Aliases and Hide My Email
Free accounts get 10 aliases. Plus and the Business plans add Hide My Email addresses for sign-ups and newsletters.
- 7
Private sign-up and recovery
Accounts can be created without a phone number or a secondary email, and recovery uses a seed phrase.
- 8
A 3.0 GPA, above 100 of 122
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 AtomicMail you would be making an email client: sending, receiving, threading and searching years of mail. That is not a weekend's work, with an AI app builder or without one.
AtomicMail at a glance
- Pricing
- Free plan, from $3 per user / month (Business Starter, billing basis not stated)
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web, macOS, Windows, Linux, iOS, Android
- Made by
- AtomicMail Systems OÜ
- Category
- Email Apps
- Our grade
- 3.0 GPA, very good
The report card
Best for encrypted email with a free plan
AtomicMail is encrypted email with a free plan that has unlimited storage and 10 aliases, and paid plans from $3 a user a month. Plus is $7 on monthly billing, and it doesn't say whether business prices assume annual billing.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | The free plan has unlimited storage and 10 aliases. Plus is $5 a month billed annually, a little under the middle of what email services charge. |
| Free plan and trial | B | A free encrypted mailbox with unlimited storage, 10 aliases and no phone number needed. One person could live on it. |
| Features | B | Encryption, aliases, Hide My Email, recovery by seed phrase and custom-domain team mail. The listing shows no gap in the job. |
| Ease of use | C | No store rating on record. You set up a recovery seed phrase and your own aliases, and a lost phrase is yours to deal with. |
| Platforms and integrations | B | Web, Windows, macOS, Linux, iPhone and Android apps. No API or integrations are listed. |
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 AtomicMail is for
- Fits if you want an encrypted mailbox with no phone number
- Works for small teams that want custom-domain mail at $3 or $6 a user
Who it is not for
- Pricey if you pay monthly, as Plus is $7 against $5 on annual billing
- Tight if you stay free: 10 aliases and no custom domain
- Watch out: the business prices don't say whether they assume annual billing
- Watch out: Atomic GPT and Atomic VPN limits on Plus and Business aren't stated
- Watch out: teams of 100 or more are sent to a contact form
Good to know
Good for
- People who want encrypted email without giving a phone number
- Small teams that want encrypted mail on their own domain
- Users who want many aliases to separate sign-ups
Worth knowing
- Plus is $7 a month when billed monthly; the $5 price is for annual billing ($60 a year).
- Business Starter and Standard prices do not say whether they assume annual billing.
- Teams of 100 or more seats are sent to a contact form for an Enterprise plan.
- Atomic GPT and Atomic VPN are listed as included on Plus and Business plans; their limits are not stated.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$3
A month to start, for each person. There is a free plan too
AtomicMail has a free plan. Paid plans start at $3 per user / month (Business Starter, billing basis not stated).
Free
$0
Encrypted mailbox with unlimited storage, 10 aliases and sign-up without a phone number.
Plus
$5
per month, billed annually ($7 billed monthly)
15 aliases, Hide My Email, custom signature, AI writing tools and premium support.
Business Starter
$3
per user / month, billing basis not stated
Your own domain, 15 GB per user, 5 aliases per user and Hide My Email.
Business Standard
$6
per user / month, billing basis not stated
Your own domain, 50 GB per user, 10 aliases per user and 50 Hide My Email addresses.
The free plan
Encrypted email on atomicmail.io with unlimited storage, 10 aliases and recovery by seed phrase.
Read from atomicmail.io on Nov 13, 2026.
Ways to pay less
Annual discount
20% off Plus with annual billing
The pricing page shows Plus at $5 a month on annual billing against $7 billed monthly, saving $24 a year.
Stated on atomicmail.io
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
6
Places it runs: Web, macOS, Windows, Linux, iOS and Android
Encrypted email with a free plan and custom-domain business plans. Here is what it does, as its own site describes it, and what it covers: end-to-end encrypted, AI features, email client, email signature.
Encryption, aliases, Hide My Email, recovery by seed phrase and custom-domain team mail.
- Encryption
- Messages between Atomic users use ECIES encryption; mail to other providers can be encrypted with a password or as a file. The vendor says it cannot read encrypted content.
- Aliases and Hide My Email
- Free accounts get 10 aliases. Plus and the Business plans add Hide My Email addresses for sign-ups and newsletters.
- Private sign-up and recovery
- Accounts can be created without a phone number or a secondary email, and recovery uses a seed phrase.
- AI writing suite on Plus
- Plus includes a writing assistant, grammar checker, summarizer, translator, security helper and read-aloud.
- Custom-domain team email
- Business plans give each user an address on the company's own domain, with end-to-end encryption and per-user storage.
Where it runs
- Web
- macOS
- Windows
- Linux
- iOS
- Android
What it works with
Its own pages name no integrations.
AtomicMail is made by AtomicMail Systems OÜ.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
100/122
Other email apps it is graded above
AtomicMail's GPA of 3.0 is higher than 100 of the 122 other email apps we grade, and level with 15.
It stands best on value for money (A, above 88 of 122) and worst on ease of use (C, above 20).
Its paid plans start at $3 a month for each person, against a middle price of $4.92 for the category: 19 of the 76 others that charge start lower.
On features, ease of use and platforms it scores 2.7 out of 4. 2 tools score higher and cost less.
Each grade against the category
Every bar is all 123 email apps we grade, cut by the letter each got. AtomicMail’s own letter is outlined.
- AValue for moneyAbove 88 of 122
- BFree plan and trialAbove 69 of 122
- BFeaturesAbove 79 of 122
- CEase of useAbove 20 of 122
- BPlatforms and integrationsAbove 57 of 122
Price against what you get
Each dot is one of 107 email apps. Further left costs less; higher up scores better on features, ease of use and platforms. AtomicMail 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 AtomicMail you would be making an email client: sending, receiving, threading and searching years of mail. That is not a weekend's work, with an AI app builder or without one.
It is one of the better ones too: its GPA of 3.0 is higher than 100 of the 122 other email apps we grade. It costs $36 a year.
What you could make
- Email signature: an app builder makes this well.
What you could not
- An email client: sending, receiving, threading and searching years of mail.
- Apps for macOS, Windows, Linux, iOS and Android that stay in step with each other.
- It is priced for each person, which means accounts and billing for a team.
- End-to-end encryption done properly.
- AI features, unless you pay a model provider for each request yourself.
- The depth: we grade its features B, which means it covers the whole job.
What this rests on. AtomicMail’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
Proton Mail, Tuta Mail, Mailfence, StartMail and Fastmail
The 5 tools AtomicMail is most often weighed against, with where each one differs from it.
- 3.0GPA
Proton Mail
Free plan · from $3.99/mo
End-to-end encrypted email service based in Switzerland.
- Proton Mail is open source, according to its own site.
- AtomicMail also covers email signature.
- Proton Mail also covers calendar.
- 2.8GPA
Tuta Mail
Free plan · from €3/mo
End-to-end encrypted email and calendar from Germany.
- Tuta Mail is open source, according to its own site.
- AtomicMail also covers email signature.
- Tuta Mail also covers calendar.
- 2.6GPA
Mailfence
Free plan · from €2.50/mo
Private email from Belgium with built-in OpenPGP encryption.
- Only AtomicMail lists Windows, macOS and Linux apps.
- AtomicMail also covers email signature.
- Mailfence also covers calendar and documents.
- 1.8GPA
StartMail
Free trial · from $4.99/mo
Paid private email from the Netherlands with unlimited aliases.
- AtomicMail has a free plan. StartMail does not, though it has a free trial.
- Only AtomicMail lists Windows, macOS, Linux and iOS apps.
- AtomicMail is end-to-end encrypted, according to its own site.
- 2.8GPA
Fastmail
Free trial · from $3/mo
Paid, ad-free email with calendar, contacts and custom domains.
- AtomicMail has a free plan. Fastmail does not, though it has a free trial.
- AtomicMail is end-to-end encrypted, according to its own site.
- AtomicMail also covers email signature.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
11
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 AtomicMail free?
AtomicMail has a free plan. Encrypted email on atomicmail.io with unlimited storage, 10 aliases and recovery by seed phrase.
How much does AtomicMail cost?
AtomicMail lists 4 plans. Free: $0.
What platforms does AtomicMail work on?
AtomicMail is available on Web, Windows, macOS, Linux, iOS and Android.
Does AtomicMail offer any discounts?
AtomicMail publicly lists the following: 20% off Plus with annual billing.
Is AtomicMail open source?
AtomicMail is not described as open source on its own site, as read on Nov 13, 2026.
Is AtomicMail end-to-end encrypted?
AtomicMail describes itself as end-to-end encrypted on its own site. Nobody here has audited that.
Who makes AtomicMail?
AtomicMail is made by AtomicMail Systems OÜ.
What are the alternatives to AtomicMail?
The closest alternatives to AtomicMail in our directory are Proton Mail, Tuta Mail, Mailfence, StartMail and Fastmail.
How does AtomicMail compare with other email apps?
AtomicMail's GPA of 3.0 is higher than 100 of the 122 other email apps we grade, and level with 15.
Is AtomicMail good value for money?
ToolGPA grades AtomicMail A for value for money. Its paid plans start at $3 a month for each person, against a middle price of $4.92 for the category: 19 of the 76 others that charge start lower.
Could I make my own version of AtomicMail?
To replace AtomicMail you would be making an email client: sending, receiving, threading and searching years of mail.
Where this guide comes from
The prices, plans, platforms and features were read from AtomicMail’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from AtomicMail's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.
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 AtomicMail Systems OÜ. Prices change, so check atomicmail.io before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 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.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- AtomicMail, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/atomicmail
- 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, "AtomicMail: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/atomicmail
Know someone choosing between email apps?
Send them this guide: toolgpa.com/tools/atomicmail/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded email apps after AtomicMail, each with an Insider's Guide of its own.
- Email Apps Insider's GuideEvery one of the 126 email apps we grade, compared
- Microsoft Outlook Insider's GuideMicrosoft's email and calendar app for desktop, mobile and web3.6 GPA
- AOL Mail Insider's GuideFree webmail with news and weather in a companion mobile app3.2 GPA
- BlueMail Insider's GuideCross-platform email client with a unified inbox and built-in AI3.2 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 AtomicMail’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. AtomicMail is a trademark of its owner, and this guide is not made, paid for or approved by AtomicMail Systems OÜ. Prices and plans change: check atomicmail.io before you buy.