The SeaMonkey Insider’s Guide
Everything we know about SeaMonkey 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.
SeaMonkey
The Insider’s Guide
All-in-one internet suite with browser, mail, chat and HTML editor
Every plan, grade, refund rule and rival among browsers, read from SeaMonkey’s own pages.
Made by SeaMonkey Association · 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 SeaMonkey’s own pages, its app-store listings and our grades. Every fact in it is on SeaMonkey’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 34 of the 60 other browsers we grade
SeaMonkey is a free, open-source internet application suite built on Mozilla's Gecko engine. It bundles a web browser, an email and newsgroup client, a feed reader, IRC chat and an HTML editor in one program. The site lists version 2.53.24 for Windows, macOS and Linux, in many languages.
To get you started, here are 8 things to know about SeaMonkey, taken from its own pages and our grades.
It is a program you install and start using, though a suite has more parts than a lone browser.
- 1
Best for an all-in-one browser, mail and chat suite
SeaMonkey bundles a browser, email and newsgroups, IRC chat and an HTML editor in one free program.
- 2
It is free
SeaMonkey has no paid plan at all. SeaMonkey is free; the site accepts donations and sponsors and lists no paid plan.
- 3
It runs on 3 platforms
Windows, macOS and Linux.
- 4
Browser
An Internet browser built on Gecko, the same code behind Thunderbird and the base of Firefox.
- 5
Email and newsgroups
A built-in mail and newsgroup client, plus feed reading, per the site's one-line description.
- 6
IRC chat
Chat is included in the same application as the browser and mail.
- 7
A 3.0 GPA, above 34 of 60
That is against the other browsers we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
SeaMonkey is free, so making your own would save you nothing.
SeaMonkey at a glance
- Pricing
- Free
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- macOS, Windows, Linux
- Made by
- SeaMonkey Association
- Category
- Browsers
- Our grade
- 3.0 GPA, very good
The report card
Best for an all-in-one browser, mail and chat suite
SeaMonkey bundles a browser, email and newsgroups, IRC chat and an HTML editor in one free program. It is a desktop suite only, with no phone version, and the Mac build listed is x64 only.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | Free, with donations and sponsors accepted and no paid plan, so it undercuts this category's $7 cheapest quarter. |
| Free plan and trial | A | The whole suite for Windows, macOS and Linux downloads at no charge, in 20-plus languages. |
| Features | C | Browser, mail and news, feeds, IRC and an HTML editor in one program, built on Gecko. The browser itself is the same size of job as any other. |
| Ease of use | B | No rating on record. It is a program you install and start using, though a suite has more parts than a lone browser. |
| Platforms and integrations | C | Windows x64 and x86, macOS x64 and Linux x64 and x86 builds, with no Android or iOS edition. |
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 SeaMonkey is for
- Fits if you want browser, mail and IRC in one desktop program
- Makes sense if you read newsgroups or edit HTML pages by hand
Who it is not for
- Skip it if you want a phone version, as the site offers no iOS or Android edition
- Not for you if you use an Apple silicon Mac, since only an x64 macOS build is listed
- Watch out: the current release listed is 2.53.24, built on the Gecko engine
- Too heavy if you only want to browse, since mail, chat and editor come along
Good to know
Good for
- People who want browser, mail and chat in one program
- Web developers who want an HTML editor in the same suite
- Users who prefer a community-run project
Worth knowing
- The listed macOS build is x64 only; no ARM-specific macOS build is shown.
- It is run by a community council, and the about page says it describes the only full internet suite still developed.
- The current release listed is 2.53.24, built on the Gecko engine.
- The site offers no iOS or Android edition.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
Free
No paid plan at all
SeaMonkey is free to use.
Free
$0
The full suite for Windows, macOS and Linux, in 20-plus languages.
The free plan
SeaMonkey is free; the site accepts donations and sponsors and lists no paid plan.
Read from seamonkey-project.org on Nov 13, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
3
Places it runs: macOS, Windows and Linux
All-in-one internet suite with browser, mail, chat and HTML editor. Here is what it does, as its own site describes it, and what it covers: open source, email client, rSS reader, web browser.
Browser, mail and news, feeds, IRC and an HTML editor in one program, built on Gecko.
- Browser
- An Internet browser built on Gecko, the same code behind Thunderbird and the base of Firefox.
- Email and newsgroups
- A built-in mail and newsgroup client, plus feed reading, per the site's one-line description.
- IRC chat
- Chat is included in the same application as the browser and mail.
- HTML editor and web development tools
- An HTML editor and web development tools are part of the suite.
- Multiple languages and platforms
- The download table lists Windows x64 and x86, macOS x64, and Linux x64 and x86 builds in many languages.
Where it runs
- macOS
- Windows
- Linux
What it works with
Its own pages name no integrations.
SeaMonkey is made by SeaMonkey Association.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
34/60
Other browsers it is graded above
SeaMonkey's GPA of 3.0 is higher than 34 of the 60 other browsers we grade, and level with 9.
It stands best on value for money (A, above 22 of 60) and worst on features (C, above 2).
SeaMonkey has no paid plan.
On features, ease of use and platforms it scores 2.3 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price.
Each grade against the category
Every bar is all 61 browsers we grade, cut by the letter each got. SeaMonkey’s own letter is outlined.
- AValue for moneyAbove 22 of 60
- AFree plan and trialAbove 21 of 60
- CFeaturesAbove 2 of 60
- BEase of useAbove 28 of 60
- CPlatforms and integrationsAbove 4 of 60
Price against what you get
Each dot is one of 54 browsers. Further left costs less; higher up scores better on features, ease of use and platforms. SeaMonkey 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
SeaMonkey is free, so making your own would save you nothing.
And it is not the kind of software a weekend replaces.
What you could make
- RSS reader: an app builder makes this well.
What you could not
- A web browser.
- An email client: sending, receiving, threading and searching years of mail.
- Apps for macOS, Windows and Linux that stay in step with each other.
What this rests on. SeaMonkey’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
Firefox, Pale Moon, Waterfox, LibreWolf and Floorp
The 5 tools SeaMonkey is most often weighed against, with where each one differs from it.
- 3.8GPA
Firefox
Free
Free, open-source browser from Mozilla with tracker blocking built in.
- Only Firefox lists Android and iOS apps.
- Firefox is end-to-end encrypted, according to its own site.
- SeaMonkey also covers email client and rSS reader.
- 3.0GPA
Pale Moon
Free
Free open-source browser on its own Goanna engine, with legacy add-ons.
- SeaMonkey also covers email client and rSS reader.
- 3.2GPA
Waterfox
Free
Free, open-source Firefox-based browser with a built-in ad blocker.
- Only Waterfox lists an Android app.
- SeaMonkey also covers email client and rSS reader.
- Waterfox also covers ad and tracker blocking.
- 2.8GPA
LibreWolf
Free
Free, privacy-hardened browser built on Firefox.
- SeaMonkey also covers email client and rSS reader.
- LibreWolf also covers ad and tracker blocking.
- 3.2GPA
Floorp
Free
Free, open-source Firefox-based browser with workspaces and split view.
- SeaMonkey also covers email client and rSS reader.
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 SeaMonkey free?
Yes. SeaMonkey is free to use.
How much does SeaMonkey cost?
SeaMonkey lists one plan. Free: $0.
What platforms does SeaMonkey work on?
SeaMonkey is available on Windows, macOS and Linux.
Does SeaMonkey have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. SeaMonkey is listed for Windows, macOS and Linux.
Does SeaMonkey have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. SeaMonkey is listed for Windows, macOS and Linux.
Is SeaMonkey open source?
Yes. SeaMonkey is open source, according to its own site.
Who makes SeaMonkey?
SeaMonkey is made by SeaMonkey Association.
What are the alternatives to SeaMonkey?
The closest alternatives to SeaMonkey in our directory are Firefox, Pale Moon, Waterfox, LibreWolf and Floorp.
How does SeaMonkey compare with other browsers?
SeaMonkey's GPA of 3.0 is higher than 34 of the 60 other browsers we grade, and level with 9.
Is SeaMonkey good value for money?
ToolGPA grades SeaMonkey A for value for money. SeaMonkey has no paid plan.
Could I make my own version of SeaMonkey?
SeaMonkey is free, so making your own would save you nothing. And it is not the kind of software a weekend replaces.
Where this guide comes from
The prices, plans, platforms and features were read from SeaMonkey’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 SeaMonkey Association'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 SeaMonkey Association. Prices change, so check seamonkey-project.org 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
- SeaMonkey, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/seamonkey
- 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, "SeaMonkey: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/seamonkey
Know someone choosing between browsers?
Send them this guide: toolgpa.com/tools/seamonkey/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded browsers after SeaMonkey, each with an Insider's Guide of its own.
- Browsers Insider's GuideEvery one of the 61 browsers we grade, compared
- Brave Insider's GuideOpen-source browser that blocks ads and trackers by default3.8 GPA
- Firefox Insider's GuideFree, open-source browser from Mozilla with tracker blocking built in3.8 GPA
- Vivaldi Insider's GuideCustomizable browser with built-in mail, calendar and feed reader3.8 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 SeaMonkey’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. SeaMonkey is a trademark of its owner, and this guide is not made, paid for or approved by SeaMonkey Association. Prices and plans change: check seamonkey-project.org before you buy.