CardBoss, sold in the app stores as Card Boss Grading and PREGRADE by Card Boss, is an AI card grading app for iPhone and Android. You photograph the front and back of a card on a black background, and within minutes it returns an overall digital grade built from four subgrades: centering, corners, edges and surface. You also get a detailed report, a downloadable digital slab and a unique card ID. It is not free. You buy card packs, from about 10 dollars for a single card up to larger bundles. It is useful as a pre screen before you pay a real grading company, but the per card pricing adds up fast, the ratings are mixed, and like every photo based grader it cannot see what a camera cannot see.
Here is how it works, what it costs, what collectors say about it, and when it makes sense.
What CardBoss is
CardBoss is made by Relentless Ventures LLC. The company describes its grading as "patented AI technology" and says it grades "at the same level as our competitors" while removing human error and bias from the process. That is a company claim. We could not find any independent, same card study comparing CardBoss results with PSA, BGS, SGC or CGC.
The important thing to understand is what CardBoss gives you. It is a digital grade, not a physical one. Nothing gets mailed and nothing gets encapsulated. CardBoss itself describes the result as a preliminary assessment rather than a replacement for an official grade. The digital slab is an image you can save and share, not a holder a buyer can inspect.
If you are new to how these tools work in general, our guide to AI card grading explains what a photo can and cannot tell you.
How the CardBoss AI card grading app works
The workflow is straightforward. You open the app, take the card out of its sleeve or toploader if it is safe to do so, lay it on a black background, and photograph the front and the back. You submit the photos, and CardBoss scores the card on centering, corners, edges and surface, then combines those into one overall grade.
The result comes with a report breaking down each subgrade, a digital slab image with the grade on it, and a card ID tied to that grading record. CardBoss advertises grades "within minutes." Most reviewers agree it is fast, though at least one App Store reviewer said grade notifications sometimes took hours.
CardBoss pricing: what it actually costs
This is where CardBoss differs most from other apps. You pay per card. At the time of writing, CardBoss lists a single card at about 10 dollars, a two card Starter pack at about 10 dollars, a four card Pro pack at about 15 dollars and a seven card Premium pack at about 20 dollars, with lower per card rates at higher counts. The App Store listing also shows larger packages, including Mint at about 50 dollars, Gem Mint at about 100 dollars, a monthly Premium plan and a commercial monthly plan for shops.
The packs are labeled "Subscribe," and the public pages do not clearly state how often you are billed, so read the checkout screen carefully. One App Store reviewer said they were charged monthly while their card counter did not go up, and that they planned to cancel. If you buy a pack, check your subscriptions in your phone's settings afterward.
To put the cost in context: at two to three dollars per card on the bigger packs, pre screening a stack of fifty cards costs real money. That math works if the stack includes a few cards worth grading, because skipping one bad submission at a grading company saves more than that. It does not work if you just want to know roughly what condition your binder is in.
CardBoss ratings and reviews
At the time of writing, Card Boss Grading has a 3.7 star rating from 26 ratings on the App Store, and the Android app, listed as PREGRADE by Card Boss, has about 3.4 stars from 17 reviews and more than a thousand downloads. Those are small numbers, so a few reviews swing the average.
The positive reviews focus on two things. Collectors like using it to avoid paying to grade cards that would not come back high, and one reviewer said they pre graded over a hundred cards and were happy with how often the results matched. Several mention fast, helpful customer service.
The negative reviews focus on billing and timing: unclear charges, a card counter that did not update, and notifications that lagged. Reviewers also stress taking clear photos, which is true of every app like this.
Does AI grading actually work? The honest answer
Ask about AI grading apps in a collector forum and someone will say they are all useless, because you cannot evaluate a card from a photo, and centering is the only thing a photo measures well. That is too harsh, but it is not wrong about the limits.
A photo is genuinely good for centering, which is geometry. It is decent at obvious corner whitening and edge chipping. It is weak at surface. Light scratches, print lines, small dents and gloss loss usually only show up when you tilt a card under a light, and a flat photo does not tilt. It cannot detect trimming, recoloring or a fake. CardBoss's black background and front plus back photos help with edges and centering, but they do not change those limits.
So treat a CardBoss grade the way you would treat any AI grade: as a range, and as a reason to look closer. If it says 9.5, check the surface yourself under a lamp before you pay a grading company. If it says 7, it probably found something real.
What CardBoss does well
Four subgrades, not one number. Seeing which of the four areas pulled the grade down is more useful than a single score, and it tells you what to check on the card.
Front and back. Back centering and back corners count at every major grading company, and CardBoss asks for both sides.
A shareable record. The digital slab and card ID are handy if you want to show a buyer or a friend what the app found, as long as everyone understands it is not an official grade.
Speed. For most users, results come back in minutes.
Where CardBoss falls short
Per card cost. Paying for every card makes it expensive to sort a big stack, which is exactly the job AI pre screening is best at.
No pricing. CardBoss tells you a grade, not what the card is worth raw or graded. The real question behind grading is whether a card is worth more slabbed than the fee costs, and the app does not answer that on its own.
Mixed billing reviews. The "Subscribe" labels and the complaints about charges mean you should check exactly what you are agreeing to.
Unproven accuracy claims. "Patented" and "same level as our competitors" are marketing claims. There is no published error rate.
CardBoss alternatives
Other AI grading apps take different approaches. Some return predicted grades for several grading companies, some add marketplace pricing, and some offer a Chrome extension for checking listing photos. We compared the main options side by side in our roundup of the best card grading apps.
Cards AI takes a different route from CardBoss. Instead of selling grades one card at a time, the grade is part of every scan. You get a Cards AI Grade with subscores for centering, corners, edges and surface (AI estimate only), next to recent eBay sold prices for the raw card and for graded copies. That puts the grade and the money in the same place, so you can see whether a card is worth sending to PSA or SGC, not just what condition it is in. If you are still deciding between those two, our PSA vs SGC comparison breaks down cost, speed and resale.
And if a card is valuable enough that you would rather have expert eyes on it, a local shop can look it over in person and tell you whether it is worth grading. You can find one near you in our card shop directory.
Is CardBoss worth it?
CardBoss is worth trying if you have a handful of cards you are seriously considering grading and you want a quick second opinion with subgrades before you pay a grading company. It is a harder sell if you want to pre screen a whole collection, because the per card price adds up, and it does not tell you what the cards are worth. Buy the smallest pack first, test it on a card you already know the grade of, and check your billing afterward.
Frequently asked questions
What is CardBoss? CardBoss is an AI card grading app for iPhone and Android, made by Relentless Ventures LLC. It grades cards from front and back photos and returns an overall digital grade with four subgrades, a report, a digital slab image and a unique card ID.
Is CardBoss free? No. CardBoss sells card packs, starting at about 10 dollars for a single card, with lower per card rates on larger packs. The app is free to download, but grading costs money.
Is CardBoss accurate? CardBoss says its patented AI grades at the same level as competitors, but we found no independent study comparing its results with PSA, BGS, SGC or CGC. Like all photo based graders, it is strongest on centering and weakest on surface flaws that only show under angled light.
Is a CardBoss grade an official grade? No. It is a digital pre grade. The card is not authenticated or encapsulated, and CardBoss describes its result as a preliminary assessment, not a replacement for an official grade.
How long does CardBoss take? CardBoss advertises grades within minutes. Most users report fast results, though some reviewers say notifications occasionally took hours.
What is the CardBoss digital slab? It is an image of your card with its CardBoss grade, which you can download and share. It is tied to a unique card ID, but it is not a physical holder.
Does CardBoss show card values? No. It grades condition only. To decide whether grading is worth it, you also need recent sold prices for the card raw and in graded slabs.
How do I cancel CardBoss? On iPhone, go to Settings, tap your name, then Subscriptions. On Android, open Google Play, tap your profile, then Payments and subscriptions. Check there after buying any pack, since the packs are labeled as subscriptions.
