Short answer: Spur is the right choice for a consumer-facing e-commerce or SaaS product with native mobile apps and a QA function to run it. Testmode is the right choice for business software — the ERP systems, internal tools and supplier-built applications that never get tested at all.

Both are agent-based, both take plain English, and both survive a redesign because they work from intent rather than selectors. The useful question is not which approach is better. It is which kind of software each one is aimed at.

At a glance

	Spur	Testmode
Test authoring	Plain English	Plain English
Agent model	Several specialised agents by testing type	One tester that runs what you describe
Scope	Web, native iOS and Android	Web applications
Strongest fit	E-commerce and consumer SaaS	Business, ERP, low-code and legacy software
Primary audience	QA and automation engineers, product managers	Anyone who knows the requirement
Pricing model	Annual, by test-run volume	Commercial product

Where Spur is the better tool

You sell to consumers. Spur’s examples are storefront flows — carts, promotions, out-of-stock handling, localisation. If that is your product, it is aimed squarely at you.
You need native mobile in the same test. Spur covers web and native apps. Testmode tests web applications, so a mobile requirement decides this.
You want testing split by discipline. Separate agents for exploratory, localisation, UI/UX and functional testing suit a team that thinks about QA in those categories — which usually means a team that has QA people.
You need to get through hard sign-in flows. Spur advertises handling of MFA and similar obstacles on production sites.
You run a high release cadence. Volume-based pricing and heavy parallelisation fit a team shipping constantly.

The difference in what gets tested

Spur is built for software with customers looking at it. The failure it protects against is a broken checkout on a Friday.

A great deal of software has no customers looking at it — order management, claims processing, student administration, internal portals, the ERP the business actually runs on. It is frequently the software an organisation can least afford to have break, and it is almost never covered by automated tests, because the people who understand it are not engineers and the vendor’s suite does not exist.

That is the software Testmode is built for. It follows from the same design choice: no code access, no changes to the application, no assumption that anyone on your side built it.

Where Testmode fits better

The software is internal or supplier-built. No code access required.
There is no QA function. Spur’s specialised agents assume someone who thinks in QA disciplines. Testmode assumes someone who knows the workflow.
The application is legacy. Older server-rendered business software is outside the consumer-web sweet spot.
You are doing acceptance testing. Checking that a delivered application does what was agreed is a different job from monitoring a storefront.

The honest summary

Spur is the stronger choice for consumer-facing products, especially with native mobile and a QA team to direct it.

Testmode is aimed at the software that never got tested in the first place — business applications, run by people whose job is not testing, often built by somebody else. Different products, genuinely different problems.

Before you choose, check what Testmode can and cannot test. Still comparing? Spur alternatives covers the wider field. Or see every comparison.