Updated 21 September 2026

Quality and SPC buying guide

SPC software: choose around measurements and decisions

Start with one production characteristic, the people who measure it and the action they take when a signal appears. Then follow that measurement from the gauge or operator entry through the chart, investigation and export. A useful SPC demo should make that whole journey visible with your sampling plan and a prepared test dataset.

Jump to the 4 products

Editorial responsibility: Dimitris Mitsios (Founder of The QHSE Standard; product marketing at Tekmon) · Tekmon pays for sponsored placements on this site (disclosure) · How pages are made · LinkedIn

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Explore its published safety, quality and maintenance workflows. Confirm modules and pricing in a scoped proposal.

Define which quality problem you are buying for

Buying scope	What the team needs	What to demonstrate
Production SPC	Collect measurements, monitor process behavior and assign a response to signals.	One characteristic, its sampling plan, a working data source and an operator response.
Statistical analysis	Investigate a dataset, compare methods and support improvement studies.	The required analysis and how its findings return to the production workflow.
QMS and corrective action	Manage nonconformances, investigations, approvals and corrective actions.	A controlled handoff from an SPC event to the responsible quality record.
Inspection and measurement	Capture results against specifications and maintain reliable measurement inputs.	Units, equipment identity, sampling rules and handling of missing or corrected readings.

Separate specification limits from control limits

Specification limits express the required result; control limits describe expected process variation under the chosen statistical model. A control signal can occur while measurements still meet specification. A stable process can also fail to meet specifications. NIST explains control charts and capability for a stable process.

Have your quality team approve the chart, subgrouping, baseline, signal rules and capability method before the demo. Agree any acceptance threshold for the specific process and customer requirement. A single Cpk cutoff is not a universal purchasing criterion, and an attractive chart does not establish suitable sampling or measurement quality.

Map the response into your nonconformance and CAPA workflows. Request evidence for each integration and approval step; a chart alert alone does not establish a complete corrective-action process.

SPC products to investigate

Vendor documentation describes product scope and questions to resolve in a demo; no hands-on product comparison was performed. For each product, resolve deployment and connectivity, how measurements reach the chart, the signal and operator response, and the product and quote boundaries.

Browse Quality Control & SPC listings for the wider category, which also includes adjacent quality-control products.

Tekmon pays for a sponsored placement (above); its place in this list follows the same rule as every entry. How lists are ordered

Same rule for every product: tagged “Statistical Process Control (SPC)”, “SPC”, “Manufacturing Quality”, “Quality Inspection” or “Quality Management”, with a sourced SPC or process-capability capability in its record, or one the vendor stated to us, labelled as vendor-stated. 4 qualify.

1factory
Documented: SPC and capability analysis. Source: 1factory.com
InfinityQS ProFicient
Advantive presents ProFicient for manufacturing SPC, data acquisition, charts, alerts and reporting; its training material identifies data management, collection and remote monitoring components, so name the collector, source format, licence and support owner. On-premises deployment is documented but does not prove disconnected collection. Enact is a separate product: request a ProFicient-specific quote and evaluation arrangement. Source: advantive.com
Minitab Real-Time SPC
Minitab describes cloud SPC with variable and attribute charts, capability analysis, notifications and operations, engineering and administration roles; station documentation covers measurement corrections and CSV or MWX export. The published browser requirements include an internet connection. Keep Real-Time SPC separate from general Minitab pricing, trials and Connect entitlements. Source: minitab.com
Tekmon
Vendor-stated: Statistical Process Control (SPC). Not yet confirmed in public documentation; ask to see it in a demo.

Run five tests with the same prepared dataset

Reproduce an agreed chart

Bring fictional measurements with units, timestamps, subgroup identifiers and a known missing value. Agree the chart and rules with your quality team, then compare the software result with the approved reference. Record how exclusions and baseline changes are controlled.

Distinguish a signal from a specification failure

Prepare separate examples of a statistical signal and a specification violation. Follow each alert to its recipient and response record. Demonstrate escalation and any NCR or CAPA handoff in the quoted configuration.

Correct a measurement and inspect its history

Enter a deliberate fictional error, correct it with a reason and inspect the chart, user permissions and change history. Export the selected period and check units, timestamps, subgroup identity and the context needed to interpret the correction.

Interrupt the required connection

In an agreed test environment, interrupt the collector or network connection used by the proposed deployment. Observe collection and alert behavior, then reconnect. Check for missing readings, duplicates, changed timestamps and a visible recovery status.

Reconcile the demonstration with the quote

List every license, connector, station, role and service used in the demo. Ask the vendor to identify what is standard, separately licensed or implementation work. Assign an owner and acceptance evidence to each unresolved requirement.

Build the quote around a named production scope

Specify sites, lines, stations, characteristics, sampling frequency and data volume; ask which affect the price.

Identify operator, engineer and administrator access, collection components and every required connector.

Separate software subscription or license, hosting, implementation, training and support costs.

Agree historical-data migration, baseline setup, measurement validation and responsibility for sampling plans.

Document network dependencies, recovery arrangements, backups and support ownership for each connection.

Confirm export formats, available history, retention terms, contract exit costs and any product-specific trial or pilot terms.

Keep the same five questions in every demo

Start with the first listed product names and their shared vendor questions. Record demonstrated results, configuration and open issues; the scorecard begins untested.

Start a demo scorecard

Sources and scope of this review

8 sources, checked 21 Sep 2026

Sources checked 21 September 2026. Vendor documentation establishes advertised scope, not tested performance, integration compatibility or a comparable price. NIST provides statistical context; the five demo exercises are editorial buying tests. Confirm the exact edition and configuration with each vendor.

How we evaluate software evidence

Software categories to explore

Use this Process to define the work, then explore these software types. Confirm the exact workflow and module with each vendor.

Quality Control & SPC

See all software categories

Continue with the adjacent quality workflows

FMEA Software Quality Management Software Nonconformance Management Software Calibration Management Software Quality Inspection Software QHSE Software for Manufacturing

Nonconformance Report (NCR) Template
Free template for a nonconformance report.
ISO 9001: definition, software & FAQs
Definition of ISO 9001.
Supplier quality software: qualification to incoming evidence
Software guide on supplier quality.

Frequently Asked Questions

How does SPC differ from inspection software?

SPC uses measurements over time to examine process variation and signals. Inspection records results against requirements. The same measurements may support both, but a pass/fail form does not establish control-chart, subgroup or signal-rule capability. Demonstrate the specific workflow you need.

Are specification limits the same as control limits?

No. Specification limits describe required outcomes; control limits describe expected variation under the selected statistical model. A process signal and a specification violation can occur independently. Test both conditions and their response paths.

Is there one Cpk threshold we should require?

Agree capability criteria with your quality team for the relevant process and customer requirements. First establish process stability, suitable data and the appropriate capability method. A universal cutoff does not substitute for those decisions.

Can SPC software work without an internet connection?

It depends on the deployment. A cloud product's published browser requirements can explicitly require an internet connection, and an on-premises positioning does not by itself establish disconnected collection or workstation behavior. Test each required connection and recovery path in the offered configuration.

Does SPC software automatically create NCR or CAPA records?

Do not assume that a chart alert creates a controlled quality record. Ask the vendor to demonstrate the proposed connector, record fields, ownership, approvals and failure handling with your quality system. Confirm all required modules in the quote.

Which SPC products should we compare?

In our catalogue, the 4 products that meet this guide's rule (a matching tag and a sourced SPC or process-capability capability or one the vendor stated to us) are 1factory, InfinityQS ProFicient, Minitab Real-Time SPC and Tekmon, in documented-match order (see the list on this page). That order reflects documentation, not quality; no product is recommended. Budget from terms for the exact product, deployment, users, stations, connectors and services; a vendor's general prices or trials for another product do not establish SPC pricing or trial entitlement.