Cognex In-Sight vs Keyence: the smart cameras, model by model.

Cognex In-Sight vs Keyence is mostly a software and support decision, not a sensor one. Both now sell 25 MP smart cameras with AI built in (the In-Sight 3900 and the Keyence VS-C2500). Pick In-Sight when your own team will edit the job for years. Pick the Keyence VS series when you want guided setup and a rep on your floor fast.

This is the product-level companion to our Cognex vs Keyence comparison, which covers the companies and their sales models. Here we go model by model, with every spec checked on cognex.com and keyence.com in October 2026. We integrate both brands and neither one pays us.

Which is better, Cognex In-Sight or Keyence?

Neither is better across the board. In-Sight wins when the job is unusual, the part mix is wide, or you need to edit every step of the logic. Keyence wins when the job is well defined and you want a fast, guided setup with its engineer in the room.

If you're the person who gets the 2 a.m. call when the station starts failing good parts, think about which software you'd rather open half awake. In-Sight's spreadsheet shows every cell that touched the decision. Keyence's VS software shows a clean task list and hides the plumbing. Both are defensible.

Where the hardware does differ, it's in optics, frame rate at higher resolution and the fieldbus list. If you're still choosing a brand rather than a model, start with Cognex vs Keyence, then come back.

How do the Cognex In-Sight and Keyence smart camera lineups match up?

Match four tiers. In-Sight 2800 against the Keyence IV4 vision sensor, In-Sight 3800 against the VS zoom models, In-Sight 3900 against the VS C-mount models, and the In-Sight 6900 controller against Keyence's VS-G. Comparing across tiers (a 2800 against a VS-C2500, say) tells you nothing useful.

Fig. 01Cognex smart camera vs Keyence smart camera, tier by tier

Cognex's current 2D lineup page lists the 2800, 3800, 3800 Line Scan, 3900, 8900 and 6900 as its AI systems, with the rule-based 7000, 8000 and 9000 still on sale.1 One camera you won't find there is the In-Sight D900, Cognex's earlier deep learning smart camera. If you have D900s installed, ask Cognex about the support horizon before you standardize on anything.

Keyence positions the VS series next to its VS-G, CV-X and XG-X systems,9 and files the IV4 under vision sensors.10 CV-X is the older controller family, and it's still a sensible choice for a plant that already runs it. For new single-camera AI work, the VS is what Keyence leads with.

The table comes from the Cognex product pages234 and Keyence's VS specification page.7 The temperature rows aren't like for like, since Cognex lists ambient temperature and Keyence lists case temperature.

Is the In-Sight 2800 or Keyence IV better for simple inspections?

For a single presence, orientation or sorting check, both are fine, and the deciding factor is usually who sets it up. The In-Sight 2800 brings Cognex's full software. The Keyence IV4 is closer to plug and play, with autofocus, AI imaging and plenty of fieldbus options built in.

The 2800 comes as a 1.6 MP or 2 MP camera at 45 fps with integrated lens and RGBW lighting, and Cognex says its AI OCR trains from 5 to 10 sample images.2 It runs the same In-Sight Vision Suite as the bigger cameras, which matters more than it sounds. A tech who learns the 2800 can open a 3900 job next year without retraining.

The IV4-H is a 1280 × 960 sensor with autofocus and white or infrared light, and Keyence says its AI imaging function tests over 10,000 capture conditions to suggest the best image.10 It lists EtherNet/IP, PROFINET, OPC UA and MQTT on the built-in port, with EtherCAT through an add-on unit. For a quality tech who touches the sensor twice a year, that's hard to beat.

We'd lean IV4 for a stable, one-job check on a line that already runs Keyence sensors, and 2800 when the plant is standardizing on In-Sight for its harder stations. Simple assembly verification jobs are where this tier earns its keep.

How do the In-Sight 3800 and 3900 compare with the Keyence VS series?

This is the real head-to-head. The In-Sight 3900 and the Keyence VS C-mount models both reach about 25 MP with AI on the camera. Keyence's sensors capture faster above 1.6 MP on paper. Cognex adds EtherCAT, dual Ethernet with a 2.5 Gb port, and a liquid lens autofocus option.

Fig. 02Resolution vs frame rate, In-Sight vs VS series

Look at the 5 MP column, because that's where a lot of real stations live. The VS zoom models list 81 fps, the VS C-mount 55 fps, and the In-Sight 3800 and 3900 both 32 fps.347 At 16 MP the 3900 lists 28 fps against the 3800's 18. At 25 MP the two vendors meet, 21 fps for the 3900 and 28 for the VS-C2500.

Don't size a line from those numbers alone. A frame rate is how fast the sensor grabs images, not how fast the camera decides. Cognex claims the 3900 runs inspections up to 4x faster than conventional systems, at up to 5,000 parts per minute.4 That's a best case. We time the full trigger-to-result loop with the real job and the real PLC handshake, and that number goes in the spec.

ZoomTrax vs C-mount and liquid lens

The bigger practical difference is optics. Keyence's VS zoom cameras manage 19 lenses inside an IP67 housing, so one camera model covers a huge range of fields of view at the click of a button.8 The VS-L160, for example, lists a field of view from 18 mm to 4,018 mm at 150 mm to 5,000 mm working distance.7 The In-Sight 3800 and 3900 take C-mount lenses, and the 3900 can take Cognex's high-speed liquid lens autofocus.4

Fig. 03Zoom vs C-mount: two answers to the lens question

So which do you want? If your part family changes size (small brackets one week, big housings the next), zoom is a real gift, because nobody has to stock lenses. If your parts are the same size but arrive at different heights, autofocus matters more. And if you're gauging, you may want a telecentric lens anyway, which is a C-mount conversation. Our machine vision resolution calculator tells you how many pixels you need before you pick either.

Which trains AI faster, Cognex or Keyence?

For simple jobs it's a wash. Cognex's Edge AI tools start from 5 to 10 sample images, and Keyence says the VS starts from a few dozen images trained on a general-purpose PC. The gap opens on hard jobs and at scale, where Cognex uses OneVision and Keyence leans on VS-G tuning.

Fig. 04How each vendor trains AI inspection

On the Cognex side, the 3900 page splits AI into Edge AI (pre-trained, a few images, for standard defects, classification, assembly checks and OCR) and Advanced AI (configurable models for subtle or highly variable defects), with Advanced AI available on OneVision-enabled models.4 OneVision is where you train centrally and push models to many devices. The 6900 controller adds an NVIDIA Jetson GPU and Cognex says it supports transformer-based models.5

On the Keyence side, the VS runs AI segmentation, detection, classification and OCR next to rule tools on the same image.8 The VS-G controller adds automatic tuning (you select an image and highlight the defect) and a settings verification feature that re-judges stored images after a change.9 We like that one a lot. Most false-reject trouble we get called about starts with a threshold changed on a busy shift with no re-check.

Honestly, neither network will save a bad training set. If your labels came from three inspectors with three standards, both will learn the confusion. Our deep learning vs rule-based vision guide covers when AI is worth it, and AI visual inspection on a real line covers what goes wrong after go-live.

What's the difference between In-Sight Vision Suite and Keyence VS software?

In-Sight Vision Suite gives you two editors in one tool, a guided EasyBuilder and the classic spreadsheet, across every In-Sight camera. Keyence's VS software is one guided environment with a task view, image view and properties view. Cognex gives you more room to build odd logic. Keyence gets common jobs running sooner.

EasyBuilder is the wizard for foundational jobs, the spreadsheet is for experienced developers who need custom logic, and you can start in one and move to the other.6 The newest release (firmware 26.2) adds 21 CFR Part 11 readiness, a job validation tool to catch configuration drift, and MQTT image offload.6 If you're in medical devices or pharma, that's worth a look.

Keyence's VS software is built around a task list. You add tools, see the image, set properties, and the same screen shows yield tables and threshold lists for tuning.8 It's fast. It's also opinionated, and when a job doesn't fit its assumptions you end up working around it.

The best predictor we've found is who edits the job in year two. A controls engineer who writes ladder logic and wants to see every step tends to stick with the In-Sight spreadsheet. A quality tech who'll touch it twice a year usually prefers Keyence's guardrails. Neither choice is wrong. Picking software the owner hates is.

Which is easier to wire into a PLC or robot?

Cognex lists its industrial protocols on every In-Sight spec page, and the 3900 and 6900 add EtherCAT and MQTT. Keyence's IV4 and VS-G list EtherNet/IP, PROFINET and EtherCAT, but the VS smart camera spec page lists PoE Ethernet without a fieldbus list. Confirm the protocol for your PLC in writing before you order.

The details are where integrators lose afternoons. The 3900 has two ports, a 1 Gb port for industrial Ethernet and configuration and a 2.5 Gb port for data and images only, so plan which network each one lands on.4 The 3800 lists EtherNet/IP, PROFINET, Modbus TCP and SLMP but not EtherCAT.3 On I/O, both In-Sight models give you one opto-isolated trigger plus up to 3 inputs and 4 outputs through a breakout cable.

The VS camera takes power and data over one M12 X-coded cable (PoE to IEEE 802.3at), with an M12 A-coded cable for 1 input, 3 outputs and 2 switchable I/O.7 That's a tidy install on a robot. But because we couldn't find EtherNet/IP or PROFINET listed for the VS camera itself, we'd ask Keyence directly how it talks to your specific PLC. The VS-G controller does list EtherNet/IP, PROFINET (Conformance Class B) and EtherCAT.9

For robot guidance, both vendors have calibration tools, and the hard part is the hand-eye calibration and the handshake, not the camera brand. Our vision-guided robotics guide walks through it.

When do you need an In-Sight 6900 or Keyence VS-G instead of a smart camera?

Move to a controller when one station needs several cameras, very high resolution, line scan, or AI models too heavy for a smart camera. The In-Sight 6900 reaches 65 MP area scan and 8K line scan with an NVIDIA Jetson GPU. The VS-G takes up to 8 cameras with built-in image storage.

The 6900 is modular. You pick Cognex industrial cameras, lenses and lights, and the controller lists 256 GB of image storage and two 5 Gb Ethernet ports.5 The VS-G comes in 16 and 32 core versions with 240 or 480 GB of storage, expandable to 4 TB.9 That storage is its quiet strength. Keeping every image, good parts included, is how you answer an auditor six months later.

There's a third path that's often right on multi-view stations. A PC with standard industrial cameras can be cheaper per added view, as we explain in smart camera vs PC-based vision. And if Omron is also on your list, see Keyence vs Omron.

How much do Cognex and Keyence smart cameras cost?

Neither vendor publishes a price list. Cognex's product pages offer a pricing request,3 and Keyence's send you to a price inquiry form.7 From the quotes we see, smart cameras land between the low thousands and the low tens of thousands of dollars, and the installed station costs several times the camera.

That range is ours, not a list price. The sensor tier (2800, IV4) usually sits in the low thousands, and a 25 MP AI camera or a multi-camera controller sits well above a 3800. Volume, AI licensing and how badly the account team wants the win all move the number. Our machine vision system cost guide breaks the whole station down line by line.

Keyence is often quoted higher per unit, and people stop reading there. But Keyence bundles application help into that price, and on a simple job the setup time it saves can cover the difference. If Cognex programming is bought separately from a distributor or integrator, add those hours before you compare. Price a validated station, line by line, with the year-two change rate written down.

How should you run a Cognex vs Keyence smart camera bake-off?

Give both vendors the same labeled parts, the same success criteria and the same deadline, then score them blind on escapes and false rejects. Time the full trigger-to-result loop with your PLC. And make each vendor show you how a technician would change the job, not just how the demo engineer built it.

1. Pull 50 to 100 good parts and every defect class from quality, plus the worst parts in the scrap bin.
2. Write the decision as numbers. Smallest defect, allowed escape rate, allowed false-reject rate, cycle time.
3. Fix the station geometry (working distance, mounting envelope, ambient light) so neither vendor wins by moving the camera.
4. Run a blind test set the vendor hasn't seen. Score escapes and false rejects separately.
5. Ask your own tech to make one change, like a new part number, while the vendor watches.

Lighting decides more bake-offs than brand does, so read the machine vision lighting guide before the demo day. If false rejects are already your problem, why your vision system rejects good parts is the post to read. For the same comparison on barcode readers, see Cognex DataMan vs Keyence SR, and if you'd like a third option on the shortlist, Cognex and Keyence alternatives covers vendors that publish prices. When the camera goes inside a robot cell, we build it into the cell design itself, as our machine vision capability page describes.

Frequently asked questions

Is the Cognex In-Sight D900 discontinued?

The In-Sight D900 doesn't appear on Cognex's current 2D vision systems page, which lists the 2800, 3800, 3900, 8900 and 6900 as its AI systems. Cognex hasn't told us an end-of-support date, so if you run D900s, ask your Cognex rep or distributor for the support horizon and the recommended migration path, most likely the 3900 or 6900 with OneVision.

Can a Keyence VS camera read barcodes?

Yes. Keyence lists 1D code and 2D code tools among the VS series rule-based tools, next to its AI tools. A smart camera is a good choice when one image has to do inspection and code reading together. For a station that only reads codes, especially hard direct part marks, a dedicated reader like the Keyence SR or Cognex DataMan is usually faster to set up.

Does Cognex In-Sight support EtherCAT?

Some models do. The In-Sight 3900 and the In-Sight 6900 controller list EtherCAT alongside PROFINET, EtherNet/IP, SLMP and Modbus TCP. The In-Sight 3800 spec page lists EtherNet/IP, PROFINET, Modbus TCP and SLMP but not EtherCAT, and the 2800 lists EtherNet/IP, PROFINET, SLMP and OPC UA. Check the exact model before you design the network.

Is the Keyence VS series waterproof?

Keyence rates the VS smart cameras IP67 under IEC 60529, which covers dust and temporary immersion. That isn't the same as a washdown rating for high-pressure, hot or caustic cleaning, which food and pharma lines often need. For washdown, plan a protective housing and ask Keyence what it has tested against your cleaning chemicals.

Do Cognex In-Sight cameras need a PC?

Not to run. In-Sight cameras make decisions on the device and talk directly to the PLC. You do need a PC with In-Sight Vision Suite to build and edit jobs, and Advanced AI models are developed in OneVision before they're deployed. Keyence works similarly, with VS training done on a general-purpose PC and inspection running on the camera.

Can you mix Cognex and Keyence cameras on the same line?

You can, and plenty of plants do, because both talk standard industrial Ethernet to the PLC. The cost is people. Every brand you add is another software tool, another spare-parts shelf and another skill set your technicians need on the night shift. We'd standardize on one brand per plant where we can and make exceptions only for a clear technical reason.