SeaMonkey review (2026): is it any good?
All-in-one internet suite with browser, mail, chat and HTML editor
SeaMonkey report card
Very good · out of 4.0 · graded Nov 13, 2026
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.
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 SeaMonkey 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
Why SeaMonkey gets a 3.0
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- AValue for moneyFree, with donations and sponsors accepted and no paid plan, so it undercuts this category's $7 cheapest quarter.
- AFree plan and trialThe whole suite for Windows, macOS and Linux downloads at no charge, in 20-plus languages.
- CFeaturesBrowser, 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.
- BEase of useNo rating on record. It is a program you install and start using, though a suite has more parts than a lone browser.
- CPlatforms and integrationsWindows x64 and x86, macOS x64 and Linux x64 and x86 builds, with no Android or iOS edition.
What these grades rest on. 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. How we review and grade.
Make SeaMonkey? Put this grade on your site
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<a href="https://toolgpa.com/tools/seamonkey#review"><img src="https://toolgpa.com/badge/seamonkey.svg" alt="SeaMonkey: 3.0 GPA on ToolGPA" width="196" height="56"></a>Where SeaMonkey stands among browsers
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, level with 38
- AFree plan and trialAbove 21 of 60, level with 39
- CFeaturesAbove 2 of 60, level with 46
- BEase of useAbove 28 of 60, level with 26
- CPlatforms and integrationsAbove 4 of 60, level with 34
Price against what you get
Each dot is one of 54 browsers. Further left costs less, and higher up scores better on features, ease of use and platforms. Point at a dot to see which tool it is.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Keep SeaMonkey, or make your own?
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.
What is SeaMonkey?
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.
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.
Key features
- 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.
SeaMonkey pricing
As of Nov 13, 2026, SeaMonkey is free to use.
- Starts at
- Free
- Free plan
- SeaMonkey is free; the site accepts donations and sponsors and lists no paid plan.
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| Free | $0 | The full suite for Windows, macOS and Linux, in 20-plus languages. |
Read from seamonkey-project.org on Nov 13, 2026. Prices change, so confirm with SeaMonkey before you buy.
SeaMonkey alternatives
Common questions
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.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Nov 13, 2026.