Nightshift Data
Check a part free
Built for fitment-driven catalogs

If AI can't confirm the fit,
it won't sell your part.

Shoppers now ask ChatGPT and Google “Does this fit my 2021 Sportsman 570?” When your fitment is buried in descriptions, the answer is “I can't confirm” — and the shopper moves on to a listing it can read. Fitcheck finds the gaps and turns them into structured data assistants can trust.

Made for catalogs where the right part depends on what it goes on: powersports, marine, auto, RV, outdoor power, ag and heavy equipment, appliance and bicycle parts.

Check a part free See an example report

Free · No signup · Up to 10 parts per check

Can-Am Defender HD10 side-by-side with a front winch. Photo: Public Affairs Office, Armed Forces of the Philippines (cropped), Public domain, via Wikimedia Commons.
Part: winch mount plate
A shopper asks an AI assistant
Example · same question, same assistant

Does this winch mount fit a 2022 Can-Am Defender HD10?

Todaycan't confirm

I can't confirm. The listing doesn't include a fitment list, so I can't tell whether it fits your Defender.

With complete dataconfirmed

Yes. It's listed for 2016–2022 Can-Am Defender HD8 and HD10, and isn't compatible with models that have a factory winch.

AI assistants are already sending shoppers to stores: traffic from generative AI tools to U.S. retail sites rose 693% in the 2025 holiday season. Adobe Analytics

Try it here — free

Paste a product page. See what AI sees.

Or upload a feed, or start with one of our sample parts below.

fitcheck: ~/product-page
$

Optional — we'll send you a copy of the results.

We save the URL or file name you check and any contact details you enter, so we can send results and follow up. We don't sell your data. Privacy

Try a sampleSee an example report
AI access demos
How the check works

One check. Everything an AI assistant needs to confirm the fit.

We read every place your fitment and specs might live, check them against what buyers ask, and hand back fixes you can load straight into your store.

What we read
Product page
Feed (CSV)
Structured data
Spec & fitment tables
robots.txt & firewall
read · check · fix · test
What you get
Readiness scoreFitment, normalizedFixes from your dataReady-to-paste JSON-LDImproved feed CSVAI answer testAI access report
01
Read the page

Structured data, meta tags, spec tables, fitment tables and the description — each value tagged with where it came from.

02
Check every attribute

Fitment, part numbers, GTIN, specs, kit contents and more, scored against a fitment template weighted for what buyers ask.

03
Suggest fixes

Every suggested value quotes your own data. Anything we can't back up is marked “Needs supplier data”, never guessed.

04
Test an AI answer

A real buyer question — “Does this fit my 2021 Sportsman 570?” — answered with today's data and with the fixes.

Industries we serve

If your parts fit something, we check it.

Fitcheck is built for catalogs where the right part depends on what it goes on — a machine, an engine, a model number or a standard.

All industries
Side-by-side UTV parked in a forest. Photo: Big Blue Gnu, CC BY-SA 4.0, via Wikimedia Commons.
Powersports

ATVs, UTVs, dirt bikes, snowmobiles and PWC

Year · make · model · trim
Outboard motors on boats at a dock. Photo: W.carter, CC0, via Wikimedia Commons.
Marine

Outboards, sterndrives, boats and trailers

Engine make · model · HP · serial range
Ford F-150 pickup truck. Photo: Alexander Migl, CC BY-SA 4.0, via Wikimedia Commons.
Auto & truck

Cars, trucks and SUVs

Year · make · model · engine · drivetrain
Fifth-wheel RV trailer. Photo: Anshamblen15, CC BY-SA 4.0, via Wikimedia Commons.
RV & trailer

Motorhomes, travel trailers, toy haulers and hitches

Model · chassis · size · weight rating
Riding lawn mower. Photo: Charles & Hudson, CC BY-SA 2.0, via Wikimedia Commons.
Outdoor power equipment

Mowers, trimmers, chainsaws and generators

Equipment model · deck size · engine
Compact tractor with front loader. Photo: Novoklimov, CC BY 4.0, via Wikimedia Commons.
Ag & heavy equipment

Tractors, skid steers and excavators

Model · serial range
Row of front-load washing machines. Photo: ArtOfHappiness, CC BY-SA 4.0, via Wikimedia Commons.
Appliance parts

Washers, dryers, refrigerators and ranges

Appliance model number
Gravel bicycle. Photo: Jeff Dieffenbach, CC BY 4.0, via Wikimedia Commons.
Bicycle parts

Road, mountain and e-bikes

Wheel size · axle · drivetrain · brake mount
FAQ

Frequently asked questions

What is “structured data”?

A hidden, machine-readable version of your product page — brand, part number, price, and what the part fits — written in a standard format (schema.org). Search engines and AI assistants use it to know exactly what you sell instead of guessing from your description. Many parts pages have none, or only the basics.

Do I need to change my website?

Not to run the check. To fix what it finds, you'd add the structured data block we generate to your product pages and load the improved CSV back into your catalog or feed. Your web developer, agency or platform support can usually do both — it's a template change, not a rebuild.

Which platforms does it work with?

Any. We read your public product pages or a CSV export, so it doesn't matter whether you're on Shopify, BigCommerce, a dealer website platform or something custom. The fixes come back as standard JSON-LD and CSV.

Will it make up fitment for my parts?

No. Every suggested value quotes your own page or feed, and we check that the quote is really there. Anything we can't back up is marked “Needs supplier data” — never guessed.

How is this different from Google Merchant Center?

Merchant Center checks whether your feed meets Google Shopping's rules. Fitcheck checks whether an AI assistant can answer a buyer's real question — “does this fit my machine?” — and whether ChatGPT, Claude and Perplexity can read your pages at all.

What do you keep?

The URL or file name you check, summary numbers from the result, and any contact details you choose to enter. Not your feed contents, page text or IP address. We don't sell your data.