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testcritic

Respondent vs Optimal Workshop

Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.

Entry price

From $40 per B2C session at pay-as-you-go, plus the incentive you set

Paid

From $199 per month (billed annually, includes 5 launched studies)

Free tier

What drives the bill

The metric that actually scales your invoice.

Session fees are $40 B2C and $80 B2B at pay-as-you-go, falling about 30% on a large annual commitment, with a further discount for unmoderated studies. You are only charged for completed sessions — no-shows and screen-outs are free. Incentives are separate and you fund them: $100-$400 per professional B2B participant is normal, on top of the session fee.

Annual plans reduce the effective monthly rate substantially; recruitment is separate.

Free tier

No subscription required; pay per completed session.

Free plan with limited participants per study.

Open source

Self-hostable

No-code authoring

Languages

Codeless
Codeless

Platforms

Web
Web

Fits teams

StartupScale-up / mid-marketEnterprise
Scale-up / mid-marketEnterprise

Adoption

Established

Respondent · since 2016

Established

Optimal Workshop · since 2008

Strengths

  • Reaches professional segments that general panels simply do not contain.
  • Verification meaningfully reduces participants misrepresenting their role.
  • No subscription commitment.
  • The reference tool for card sorting and tree testing; the analysis visualisations are excellent.
  • Tree testing validates navigation before any build effort is spent.
  • Well-established methodology support and training material.

Limitations

  • Expensive per participant once incentives are included.
  • Recruitment only, no research tooling.
  • Some fraudulent participation persists despite verification.
  • Narrow scope — it does not do usability testing of interfaces.
  • Expensive per seat for occasional use.
  • Interface is dated in places.

Best for

B2B product teams that need to talk to specific professional roles.

Teams restructuring navigation, taxonomy or content on a large site.

All of these integrate with: Slack.

Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.