The Mos Insider’s Guide
Everything we know about Mos 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.
Mos
The Insider’s Guide
Free Mac menu bar utility for smooth mouse wheel scrolling
Every plan, grade, refund rule and rival among desktop utilities, read from Mos’s own pages.
Made by Caldis · 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 Mos’s own pages, its app-store listings and our grades. Every fact in it is on Mos’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
3.2
GPA, above 182 of the 186 other desktop utilities we grade
Mos is a macOS menu bar app that smooths out mouse wheel scrolling so it moves more like a trackpad. It keeps scroll settings per app, lets vertical and horizontal scrolling be tuned separately, and can bind mouse buttons to actions. The vendor describes it as free and open source.
To get you started, here are 8 things to know about Mos, taken from its own pages and our grades.
But it needs the Accessibility permission, its CC BY-NC licence is non-commercial, and it is Mac only.
- 1
Best for smoother mouse wheel scrolling on a Mac
Mos smooths mouse wheel scrolling on a Mac and keeps settings per app, and it's free.
- 2
It is free
Mos has no paid plan at all. The whole app is free; a Donate link is offered.
- 3
It runs on macOS
macOS.
- 4
Smooth wheel scrolling
Turns raw wheel steps into continuous motion, with step, speed and duration values that can be tuned.
- 5
Per-app profiles
Each app can inherit the defaults or override its own scroll and button behavior.
- 6
Separate axes and reversal
Vertical and horizontal scrolling are configured independently, and direction can be reversed per axis.
- 7
A 3.2 GPA, above 182 of 186
That is against the other desktop utilities we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
Mos is free, so making your own would save you nothing.
Mos at a glance
- Pricing
- Free
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- macOS
- Made by
- Caldis
- Category
- Desktop Utilities
- Our grade
- 3.2 GPA, very good
The report card
Best for smoother mouse wheel scrolling on a Mac
Mos smooths mouse wheel scrolling on a Mac and keeps settings per app, and it's free. But it needs the Accessibility permission, its CC BY-NC licence is non-commercial, and it is Mac only.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | Free to use, with a donate link offered, and no paid plan is listed on the site. |
| Free plan and trial | A | The whole app is free, with no paid edition, limit or trial on record. |
| Features | B | Smooth scrolling, per-app profiles, separate axes, button bindings and Logitech support. Nothing in the listing is missing from the job, though pointer acceleration is left to other tools. |
| Ease of use | B | A menu bar app that works once the Accessibility permission is granted. No store rating is on record. |
| Platforms and integrations | C | Mac only. No Windows, Linux or phone version. |
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 Mos is for
- Fits if you use a wheel mouse on a Mac and want it to scroll like a trackpad
- Works for per-app scroll settings
Who it is not for
- Not for you if you use Windows or Linux, as it is Mac only
- Watch out: the CC BY-NC 4.0 licence is non-commercial, not a standard open source one
- Too light for you if you want paid support: its own comparison page points those users to commercial tools
- Watch out: it needs the macOS Accessibility permission
Good to know
Good for
- Mac users who prefer a mouse but want trackpad-like scrolling
- People who need different scroll feel in different apps
- Logitech mouse owners who want to remap extra buttons on macOS
Worth knowing
- Mac only; it needs the macOS Accessibility permission to work.
- Licensed under CC BY-NC 4.0, which is a non-commercial license rather than a standard open source one.
- Its own comparison page says users who want paid support or a commercial product lifecycle may prefer commercial tools.
- Pointer acceleration and broader device settings are better handled by other tools, according to the vendor.
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
Mos is free to use.
Free to use, with a donate link offered, and no paid plan is listed on the site.
Free
$0
Full app, distributed through GitHub Releases and Homebrew.
The free plan
The whole app is free; a Donate link is offered.
Read from mos.caldis.me on Nov 13, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: macOS
Free Mac menu bar utility for smooth mouse wheel scrolling. Here is what it does, as its own site describes it, and what it covers: open source, menu bar app, keyboard and mouse remapping.
Smooth scrolling, per-app profiles, separate axes, button bindings and Logitech support.
- Smooth wheel scrolling
- Turns raw wheel steps into continuous motion, with step, speed and duration values that can be tuned.
- Per-app profiles
- Each app can inherit the defaults or override its own scroll and button behavior.
- Separate axes and reversal
- Vertical and horizontal scrolling are configured independently, and direction can be reversed per axis.
- Mouse button bindings
- Record a mouse, keyboard or custom event and bind it to an action such as Mission Control, Spaces, screenshots or a script.
- Logitech button support
- Handles button events from Logitech devices connected over Bolt, Unifying or Bluetooth.
- Scroll hotkeys
- Keys can be bound to accelerate scrolling, convert the axis or temporarily turn smoothing off.
Where it runs
- macOS
What it works with
- Logitech
Mos is made by Caldis.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
182/186
Other desktop utilities it is graded above
Mos's GPA of 3.2 is higher than 182 of the 186 other desktop utilities we grade, and level with 4.
It stands best on free plan and trial (A, above 107 of 186) and worst on platforms and integrations (C, above 111).
Mos has no paid plan.
On features, ease of use and platforms it scores 2.7 out of 4, and no tool on the category's chart scores higher without costing more.
Each grade against the category
Every bar is all 187 desktop utilities we grade, cut by the letter each got. Mos’s own letter is outlined.
- AValue for moneyAbove 55 of 186
- AFree plan and trialAbove 107 of 186
- BFeaturesAbove 113 of 186
- BEase of useAbove 78 of 186
- CPlatforms and integrationsAbove 111 of 186
Price against what you get
Each dot is one of 103 desktop utilities. Further left costs less; higher up scores better on features, ease of use and platforms. Mos 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
Mos is free, so making your own would save you nothing.
And it is not the kind of software a weekend replaces. It is one of the better ones too: its GPA of 3.2 is higher than 182 of the 186 other desktop utilities we grade.
What you could not
- Keys and buttons remapped below the level of apps.
- A native app living in the menu bar.
- A real app for macOS. Something home-made would be a web page.
- The depth: we grade its features B, which means it covers the whole job.
What this rests on. Mos’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
Scroll Reverser, LinearMouse, Mac Mouse Fix, Smooze and SteerMouse
The 5 tools Mos is most often weighed against, with where each one differs from it.
- 3.0GPA
Scroll Reverser
Free
- 2.6GPA
LinearMouse
Free
Free, open-source mouse and trackpad customizer for Mac.
- Mos also covers menu bar app.
- 2.4GPA
Mac Mouse Fix
Free trial · from $2.99 one-time
Trackpad-style gestures and smooth scrolling for third-party mice.
- Mos has a free plan. Mac Mouse Fix does not, though it has a free trial.
- Mac Mouse Fix can be bought with a one-time purchase.
- Mos also covers menu bar app.
- 2.6GPA
Smooze
Free trial · from $19.99 one-time
Mac app for smooth scrolling and mouse button actions.
- Mos has a free plan. Smooze does not, though it has a free trial.
- Mos is open source, according to its own site.
- Smooze can be bought with a one-time purchase.
- 2.4GPA
SteerMouse
Free trial · from $19.99 one-time
Mac utility for customizing mouse buttons, wheels and cursor speed.
- Mos has a free plan. SteerMouse does not, though it has a free trial.
- Mos is open source, according to its own site.
- SteerMouse can be bought with a one-time purchase.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
12
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 Mos free?
Yes. Mos is free to use.
How much does Mos cost?
Mos lists one plan. Free: $0.
What platforms does Mos work on?
Mos is available on macOS.
Does Mos have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. Mos is listed for macOS.
Does Mos have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. Mos is listed for macOS.
Is Mos open source?
Yes. Mos is open source, according to its own site.
What does Mos integrate with?
Mos's listing names Logitech. A listing names up to eight integrations, so it may connect to more.
Who makes Mos?
Mos is made by Caldis.
What are the alternatives to Mos?
The closest alternatives to Mos in our directory are Scroll Reverser, LinearMouse, Mac Mouse Fix, Smooze and SteerMouse.
How does Mos compare with other desktop utilities?
Mos's GPA of 3.2 is higher than 182 of the 186 other desktop utilities we grade, and level with 4.
Is Mos good value for money?
ToolGPA grades Mos A for value for money. Mos has no paid plan.
Could I make my own version of Mos?
Mos 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 Mos’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 Mos'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 Caldis. Prices change, so check mos.caldis.me 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
- Mos, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/mos
- 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, "Mos: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/mos
Know someone choosing between desktop utilities?
Send them this guide: toolgpa.com/tools/mos/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded desktop utilities after Mos, each with an Insider's Guide of its own.
- Desktop Utilities Insider's GuideEvery one of the 187 desktop utilities we grade, compared
- Just Color Picker Insider's GuideFree portable color picker and editor for Windows and macOS3.2 GPA
- LocalSend Insider's GuideOpen-source file sharing between nearby devices, no cloud3.2 GPA
- Ninite Insider's GuideInstalls and updates many Windows apps at once3.2 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 Mos’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. Mos is a trademark of its owner, and this guide is not made, paid for or approved by Caldis. Prices and plans change: check mos.caldis.me before you buy.