Tagging works until the day you did not tag the thing.

There is a version of this comparison where the free option built into macOS gets three dismissive sentences and the paid app wins. It would be dishonest. Finder tags are good, they cost nothing, they are already installed, they work on every file on the disk rather than only on pictures, and for a great many reference collections they are the correct and final answer.

So the useful question is not which is better. It is where the ceiling is, and whether you have hit it.

Apple's own guide is a short and clear description of what you get: add multiple tags to any file or folder, tag from the Finder or from an open document's title bar, use Control-1 through Control-7 for your favourites and Control-0 to clear a file's tags, then find things by typing a tag's colour or name into the search field or clicking it in the sidebar. Colours and names are yours to change in Finder Settings. You can also save a search as a Smart Folder that keeps itself current.

That is a real organising system. It has one structural property that decides everything below: it only knows what you told it.

The table

Two rows there are ours to be uncomfortable about. Finder tags apply to everything on the machine and are reachable from inside every application you own, which no third-party tag system can match. And Coii Ref does not read them, which is covered honestly further down.

Where Finder tags win

Free, installed, and not going anywhere. No purchase, no trial, no vendor. In a category where people have watched applications stop shipping, a feature of the operating system is the safest thing you can build a habit on.

They work everywhere. A tag applied in Finder is visible in the sidebar, in Spotlight, and in the Open and Save dialogs of every application on the machine. Coii Ref's tags exist inside Coii Ref. If you want the same organising scheme across documents, projects, invoices and pictures, tags are the only thing that reaches all of it.

They are fast to apply. Select, Control-3, done. Seven favourites on the keyboard covers most people's actual taxonomy, and Control-0 undoes a mess. Any app's tagging interface has to compete with that, and most lose.

Smart Folders are a real saved search. File > New Smart Folder, set a rule, refine it with attributes, save it with a name and a place in the sidebar. It keeps itself current. For a lot of jobs this is the whole feature people go shopping for.

Nothing to migrate, ever. Your tags are attached to your files in your folders. There is no library, no database and no export step, which is the same argument this site makes about canvases, honestly applied to something we do not sell.

Where the ceiling is

Everything a tag system knows, somebody typed. That is fine while the pile is small and becomes the whole problem at scale, in three specific ways.

The untagged tail. Every reference library has one, and it is bigger than you think — the batch you saved in a hurry, the folder somebody sent you, the three hundred stills you pulled from a film one evening and meant to file. A tag-only system cannot see any of it. This is not a criticism of tags; it is arithmetic. If the only index is the one you typed, the things you did not type are invisible.

Coii Ref's search is literal too, but it filters on facts that are already true of a file without anybody's help — its type, extension, dimensions, dates, rating, EXIF, whether it has notes, whether it has tags at all:

no:tags is the one that matters here. The keys are type ext tag rating is has no in width height added modified, AND across keys, OR inside a comma list, no parentheses. A word the parser does not recognise becomes free text rather than an error, so the grid keeps returning rows while you are still typing.

Combination. Finder search can narrow, and a Smart Folder can hold a rule set, but the thing you actually want to ask about a reference library is a sentence with four clauses in it: portrait or figure, rated four or better, not already a favourite, taller than it is wide. In Coii Ref that is one line you can edit a word at a time and watch the grid respond. A saved view stores the text and re-parses it when you open it, so renaming a tag does not leave a stale list behind — the view simply follows.

Colours are not a vocabulary. Seven favourite tags on the keyboard is a lovely interaction and a hard ceiling on nuance. People work around it by inventing longer tag names, at which point the keyboard shortcut is gone and the speed advantage with it. A reference library that has grown for five years wants tags, ratings, notes and file facts as separate axes, not one axis carrying all four.

The thing tags cannot do at all

Even a perfect tag system returns a list of files. Reference work does not end at a list; it ends at an arrangement.

The board is Winter light study.coii-canvas — pretty-printed JSON in whichever of your own folders you put it in. It diffs in version control, syncs through whatever you already sync with, and opens in a text editor in ten years without asking us for anything. Finder can show you a gallery of a folder. It cannot let you pull eleven images out of four folders, size them against each other, keep that, and come back to it in March.

What Coii Ref does not do here, plainly

It does not read your Finder tags. Coii Ref's tags are its own, kept in the workspace it writes inside the folder you pointed at, and the one importer it has reads a refern library. If years of Finder tagging is your organisation, that work does not arrive. It also does not go anywhere — the tags stay on your files, in Finder, exactly as they were — but you would be re-applying what matters inside Coii Ref rather than importing it.

The mitigation is the argument this whole page has been making: you may need fewer tags than you think, because a good deal of what people encode in tags is already a fact about the file. type:video, width:>3000, modified:>2026-06 and rating:>=4 between them replace a surprising number of hand-typed labels, and the ones left over are the genuinely subjective ones worth typing.

It does not organise anything but images and video. Your documents, project files and invoices are outside its scope entirely, and Finder tags remain the right tool for those on the same machine, on the same day.

What the $19 is actually buying

Nothing about your files changes when you install it. Coii Ref never copies, moves or renames anything: you point it at folders you already keep, it reads them where they sit — dimensions, EXIF, colour — and writes its index, thumbnails and canvas-resolution proxies inside that same folder. Whatever backs that folder up has backed up the library, copying it to another drive copies the workspace, and opening it on a second Mac needs no export step.

The folder watcher is what keeps that true while you carry on working the way you always have. Filesystem events become the smallest re-scan that makes the index correct again, so a rename in Finder stays a rename rather than becoming a new file with a lost rating, a moved folder is followed, and a drive that comes back after a month is reconciled rather than rediscovered. It keeps running after the trial ends, deliberately — an index that quietly rots is worse than no index.

Video is treated as the same kind of thing as an image the whole way through: same index pass, same tags and ratings, same query line, and proxies written at canvas resolution so a board of clips scrolls like a board of stills.

And the network story is two lines long. One licence check when you press Activate, and one request at launch read only for its Date header so a wound-back clock cannot mint trial days. No analytics, no crash reporting, no update check, no account at any point — the thirty-day trial needs no card and no sign-up.

Three symptoms, and what each one means

Rather than a threshold in images, here are the things people actually report just before they go looking for something other than tags.

You know you saved it and you cannot find it. Not "I might have saved it" — you can picture the image. You remember roughly the season you saved it in. Twenty minutes later you give up and go and find a different one on the internet. What that means is that the picture is in a batch you never tagged, and no amount of better tagging discipline from today forward reaches backwards into it.

You have stopped saving things. Collecting starts to feel like burial, so you close the tab instead. A reference library that has quietly stopped growing is almost always one that has outrun its index; people read it as laziness and it is nearly never laziness.

You have started inventing longer tag names. ref-portrait-hardlight is a sign that one axis is being asked to carry four. When a tag name encodes the subject, the lighting, the rating and the project, the scheme has run out of dimensions and is compensating with string length. That is the point at which separate axes — tags, ratings, notes and the file's own facts — pay for themselves.

If none of those describes you, this page's honest recommendation is to close it and keep your money. Tags are working.

The version of this that costs nothing

Before buying anything, there is a free experiment worth an hour.

Pick the folder you dread opening. Turn on Finder's gallery view and try to answer, out loud, the question you most often need answered about your references — mine is "what have I got that is a single figure against a plain background". Time it. Then make a Smart Folder that expresses as much of that question as Finder's attributes allow, and see how close it gets.

Two outcomes, and both are useful. If the Smart Folder gets you most of the way, you have found a free answer and should use it. If the question does not survive translation — because half of what you mean is subjective, and the other half depends on things you never typed — you have learned precisely what the missing capability is, which is a better basis for a purchase than a comparison table.

The same experiment is why the thirty-day trial has every feature in it and asks for no card. The only test that decides this is your own folders, and a restricted trial cannot run it.

What neither approach does

Neither is a backup. Finder tags live on files you still have to copy somewhere, and Coii Ref writes its workspace inside a folder that is just as capable of being the only copy in the world. Whatever already backs up your work is still the thing doing that job, and neither of these changes it.

Neither collects for you. Tags apply to a file that has already arrived; Coii Ref indexes folders that already exist. How a picture gets onto the disk is outside both of them, and if most of your collecting happens in a browser you should weigh that separately.

And neither decides what to keep. The eight nearly-identical saves of the same photograph will sit there for a decade under any scheme. That discipline is yours, and the only real help either side offers is making the duplicates easier to notice.

A note on where the tags live

Worth being explicit about, because it is the mirror image of the argument this site usually makes. Finder tags travel with your files — that is their best property, and it is the same property that makes a plain .coii-canvas worth defending. Coii Ref's tags do not travel: they are in the workspace database, which is a folder you can copy and back up as a unit, but a tag in it is not something another application will notice by opening the JPEG.

So the two systems can coexist without either being wrong. Keep colour tags in Finder for the coarse, cross-application distinctions you make about everything on the machine — a client, a project, a status. Let Coii Ref hold the fine ones that only mean anything inside a reference library, along with the ratings, the notes and the boards. Nothing forces a choice, because Coii Ref never touches your files and Finder never noticed it was installed.

Who should stay with tags

Stay with Finder tags if your collection is small enough that you can still scroll it; if seven colours genuinely cover how you think about your work; if you want one scheme across every kind of file rather than a separate one for pictures; if Smart Folders already answer the questions you ask; or if you would rather spend nothing, which is a good instinct and right more often than this site will admit.

Try Coii Ref if you have a real untagged tail and know you will never clear it by hand; if the questions you want to ask combine tags with ratings, sizes, dates and file type; if you want a wall you compose rather than a list you scroll; if video is a serious part of what you keep; and if a board saved as a plain file you can read in ten years is worth $19 to you.

If you are weighing paid options too, the refern comparison is where we concede the most, Eagle is the one that takes your files into a library, PureRef is free for personal use and floats over your work, Adobe Bridge is free and browses folders in place, and Apple Photos is the other thing already on your Mac. Or start the thirty days and point it at the folder you have been avoiding.