The price is the whole bill, not the first instalment

A reference library is the kind of thing you build over years, which makes a monthly fee for keeping it searchable a strange trade — you are not paying for new value every month, you are paying rent on access to files you already own and already indexed. This page is for the version of that decision where you would rather pay once and be done, even if the app you land on does less than the subscription would have bought.

That framing is worth being explicit about before anything else on this page, because a one-time price is a genuine tradeoff and not a strictly better deal. A subscription can fund ongoing engineering that a fixed $19 cannot, and some of the more capable tools in this exact category are the ones still billing monthly or, in a few cases, once but for a larger number. The question this page is actually answering is narrower than "which app is best" — it is "which app never asks me for another payment," and that narrower question has a much smaller, much more checkable answer.

Why folders alone still leave you shopping for something

A folder of ten thousand images tagged inconsistently over several years is searchable in principle and unusable in practice — Finder can filter by filename and a handful of system metadata, but it has no concept of a rating, no way to combine "video, four stars or better, not already a favourite" into one query, and no memory of what a tag meant to you six months after you stopped being consistent about applying it. That gap is real regardless of whether the tool that closes it bills monthly or once; it is just that most of the well-marketed tools that close it have quietly moved to monthly billing over the last few years, which is what makes "does a one-time option still exist" worth asking before you commit to either shape.

Search, priced in once rather than every month

The keys are type ext tag rating is has no in width height added modified, combined with AND across keys and OR inside a comma list, no parentheses. The same string drives the results grid, the autocompleter and a saved view, and running it a thousand times costs the same as running it once, because nothing here is billed by usage, by storage, or by how large the library has grown since you bought it.

Tags, ratings and saved views that do not get more expensive as the library grows

A subscription reference tool often prices around the size of the library — a storage tier, a limit on tagged items, a cap on saved searches that quietly pushes you toward the next plan up as the collection grows. None of that applies here, because nothing about the price is tied to how much you index. Tag ten thousand files or a hundred thousand, save three views or thirty, and the $19 does not move. A saved view stores the text of a search and re-parses it on open, so a tag renamed a year from now does not orphan anything either — there is no "your plan only keeps the last ninety days of saved searches" clause waiting in a terms page, because there is no plan at all past the one purchase.

What switching from a subscription tool actually costs

Moving away from a subscription reference manager is rarely a technical problem — the files were usually always yours — but it is often a psychological one, because cancelling feels like losing the tags and ratings built up over however many months of paying. That fear is specific to tools that keep your metadata behind their login: if the tags live in their database rather than beside your files, cancelling can mean the organisation work is what actually disappears, not the images. Coming to a tool where tags, ratings and notes live in a local database inside your own folder does not solve that fear retroactively — whatever metadata a previous subscription held stays there unless it offers its own export — but it does mean the same fear cannot recur here. There is no plan to lapse and no login for the metadata to live behind in the first place.

What "updates included" actually covers

The $19 is not a launch price that quietly becomes a subscription later — it is stated once, up front, for three Macs, and a later version of the app is a free update rather than a new purchase. There is no tier above the one you bought that unlocks more of the app's own features; the entire feature set is in the $19, and the only thing a licence gates after a 30-day trial is registering more folders and running the importer, not search, tags, ratings or canvases.

A workspace with nothing recurring hiding inside it

The database, thumbnails and proxies all live inside the folder you pointed the app at, rather than in an account tied to a plan. That matters for the one-time argument specifically: a subscription tool that stores your tags and ratings server-side effectively re-sells you access to your own metadata every month, and cancelling can mean losing the layer you built on top of your files even though the files themselves are untouched. Nothing here has that shape, because nothing here is stored anywhere billing could reach.

Where the honest comparison actually sits

Coii Ref is not the only one-time purchase in this category, and pretending otherwise would not survive a reader's first search. Eagle is $34.95 once for two machines, also with free updates and a 30-day trial — a real alternative if its habit of copying imported files into its own library is not a problem for you. refern is $35 once for three machines, on the same purchase shape as this app, and it is genuinely more capable on most feature axes: an on-device tagger that suggests tags and reads text out of images, search by meaning rather than only by tag, a relationship graph, and three platforms instead of one. Choosing Coii Ref over either on price alone would be missing what each of them actually offers for a few dollars more.

What the index reads once, rather than re-checks on a schedule

Registering a folder reads dimensions, EXIF and colour off every file in it during the first pass, so filters like width:>=3000 or a sort by colour work afterward without any manual tagging. That reading happens once per file, not on a recurring basis the way a subscription service's background processing sometimes does, and it never writes anything back into the original — a reference stays exactly the bytes it was before it was ever indexed. After the first pass, a filesystem watcher keeps the index honest as files are renamed, moved or added, so the ongoing cost of staying current is a background process running locally, not a metered service call billed by the operator somewhere else.

What a one-time price does not buy you here

Worth stating rather than discovering later. There is no search by meaning — a term matches a tag, a filename, a note or metadata you can name, or it does not match at all. There is no on-device tagger suggesting tags for you, no relationship graph connecting images by association, and no browser extension for saving something you found on a website directly into the library. Where any of those is the actual job, refern has all of them, in the same one-time-purchase shape this page is arguing for generally.

What it costs and what it runs on

$19 once, for three Macs, updates included, nothing that renews after that. The trial is 30 days with every feature on, and starting it needs no card and no account. It requires macOS 11 Big Sur or later, built natively for Apple Silicon and for Intel rather than as one binary covering both.

Two kinds of outbound request happen across the app's whole life: the licence check on Activate, and a single read of a server's Date header at launch, to stop a clock wound backward from stretching the trial. There is no in-app updater, so there is no update check, and no analytics or crash reporting — none of the ongoing infrastructure a subscription usually pays for exists here to be paid for.

Canvases that carry the same one-time logic forward

A search over a library eventually turns into a shortlist you want to arrange rather than just filter, and the canvas that comes out of that step follows the same pricing shape as everything else here: a .coii-canvas is pretty-printed JSON saved wherever you put it, with no hosting fee attached to keeping it viewable and no per-board limit the way some subscription moodboard tools cap free or lower tiers at a fixed number of boards or items. Build one canvas or fifty, and the cost of having built them was paid once, at the same $19 that paid for the search that built the shortlist in the first place. That is a small thing on any single board and a real one across years of the same library, since the number of boards a working library accumulates tends to climb steadily rather than staying at whatever count a free tier was designed around.

Who this actually suits

Someone who has already decided the recurring-billing model is the wrong fit for a tool that touches files they intend to keep for years, and who is willing to trade some capability — meaning-based search, an on-device tagger, a second and third platform — for a bill that arrives exactly once. That trade is worth making consciously rather than by default: a subscription tool is not automatically the wrong choice just because it renews, and a one-time tool is not automatically the right one just because it does not. The honest question is whether the recurring fee is buying ongoing work — new features shipping, a service running on someone else's servers, support staffed year-round — or whether it is buying the same static feature set month after month for a library that mostly just sits there getting bigger. If those specific features matter more than the billing shape, refern is the more capable app and is still, itself, a one-time purchase. If the board side of this matters as much as the search side, the moodboard-focused version of this page and the no-account, offline angle cover the same decision from those directions, and the plain reference-manager page covers the search itself in more depth than the pricing angle this page takes. For a wider shelf of apps that skip subscriptions entirely, the one-time-purchase round-up goes beyond just reference tools.

Thirty days, every feature, no card and no account: download it and decide against your own folders, not a features page, whether the $19 is the whole bill you are willing to pay. Point it at the folder that would actually benefit from a search line rather than a handful of test images, and let the trial run its full thirty days before deciding — the difference between a one-time tool and a subscription one is easiest to judge once, at the end of a real trial, rather than guessed at from a pricing page before either has touched a real library.