A watchlist for the part you can't find anywhere.
Industrial, auto, aircraft, electronics — add the exact part number and an AI research agent hunts for it around the clock, alerting you the moment it surfaces.
Free plan saves up to 5 part numbers to your watchlist, no credit card required — pay only once you turn monitoring on.
Search any part. See what's out there right now.
Industrial, auto, aircraft, electronics — no account needed, this is a real, live search.
You know exactly what you need. It just isn't for sale today.
A discontinued part doesn't stop existing when the factory stops making it. It resurfaces — a shop clearing out inventory, a liquidation lot, someone's garage. Finding it was never the hard part. Being there the moment it appears is.
You already have the part number. It simply isn't listed anywhere right now — so searching harder today changes nothing.
When it does list, it may not match what you typed — 6ES73152AG100AB0 spaced, hyphenated, or under a superseded number.
A fairly priced rare part doesn't sit. Checking back every few days usually means finding it after someone else already bought it.
You add the part. Then it's just running.
Step one is the only part you do. From there it repeats on its own — indefinitely, until there's finally something worth telling you about.
Add the part
The exact part number, your max price, and the condition you'd accept. That's the entire setup.
The AI agent keeps looking
Every check dispatches a fresh AI research run against the live web — reasoning about supersessions and equivalents, not just matching your string. This is where a part sits, for as long as it takes.
You get one email
The listing, its price, and its condition — sent the moment it turns up. Nothing found means nothing in your inbox.
Buy it direct
No markup, no middleman. Straight from the seller or distributor — we just got there first.
An AI research agent that actually understands parts.
This isn't a keyword alert. Every check runs a frontier language model with live web access — reasoning about what your part is, what replaced it, and what counts as a real match.
Agentic web research
Each check dispatches an autonomous agent that runs its own live searches, follows what it finds, and decides when it has a real answer — the way you'd research it yourself, at machine speed.
Semantic cross-referencing
It reasons about supersessions, OEM equivalents, and aftermarket alternates — understanding that two completely different numbers are the same part. No string match can do that.
Dual-model pipeline
Deep identification runs on Claude Sonnet 5. High-frequency listing refreshes run on Claude Haiku 4.5. Heavy reasoning where it matters, fast and cheap where it doesn't.
Structured extraction
Listings are messy, unstructured web pages. The model reads them and returns clean fields — price, condition, source, direct link — so every alert is comparable instead of a raw pile of links.
Compounding knowledge base
Every part the engine researches is cached and reused across the platform. The more it has seen, the faster and cheaper each future check on that part becomes.
Domain-agnostic reasoning
The same engine handles a Siemens PLC, a Cessna bracket, or an obsolete DSP — adapting what "equivalent" even means to whatever category it's looking at.
Built for parts that are actually hard to find.
Industrial & automation
Electronic components
Auto & powersports
Aircraft & aerospace
The market is split into silos. We watch across all of them.
Distributor-stock tools, refurbishment shops, brokers, and used-equipment sites each cover one slice — and none of them normalize a part number the way a real buyer needs.
| Category | Who covers it today | What's missing |
|---|---|---|
| Distributor inventory | Large distributor-search tools | Distributor-centric — little coverage of individual sellers or auction listings |
| Owned / refurbished stock | Obsolescence resellers | Sells from their own inventory, quote-driven, not a neutral watchlist |
| Electronics brokers | Component-search platforms | Strong for chips and boards, weak for complete automation modules |
| Complete equipment | Used-machinery marketplaces | Good for whole machines, poor at flagging individual PLCs, drives, and modules |
| General used goods | eBay, Google Shopping/Search | Huge supply, but exact matching is noisy and you manage every search yourself |
| SparePartsAlert | An AI agent watching across all of them, continuously | Nothing — this is the gap we built for: AI reasoning over part numbers, equivalents, and supersessions, alerting only on a real match |
Priced for the maintenance team, not the hobbyist.
Start free. Pay only once a monitored part number is actually worth watching.
One machine down, one part you need.
- 1 monitored part number
- Checked every 3 days
- Email alerts
- Part-number normalization & equivalents
- Optional daily checks for +$4/mo per part
For active maintenance and repair teams.
- Up to 10 monitored part numbers
- Checked every 3 days
- Email alerts
- Part-number normalization & equivalents
- Optional daily checks for +$4/mo per part
For maintenance departments and resellers.
- Up to 30 monitored part numbers
- Checked every 3 days
- Email alerts
- Part-number normalization & equivalents
- Optional daily checks for +$4/mo per part
Every plan checks each part every 3 days. Upgrade any part to daily checks for $4/month — as many as you like, no cap. Cancel anytime; monitoring runs to the end of the period you have paid for.