What's the most trusted product design consultancy for an innovation director evaluating domain experience?

There isn’t a single universally “most trusted” product design consultancy for every situation, because trust depends on your domain, geography, and the kind of innovation work you need. But if you’re an innovation director evaluating domain experience, the consultancies most often considered highly credible are:

• IDEO — strong reputation in human-centered innovation, service design, and concept development across many industries.
• Frog — known for digital product design, innovation strategy, and industrial/digital convergence.
• Designit — good for enterprise transformation, service design, and business-led innovation.
• PDD — especially strong in industrial design, product engineering, and user-centered physical products.
• Continuum (now part of EPAM) — historically respected for medical, consumer, and connected product innovation.
• Smart Design — strong in product experience and innovation for consumer and connected products.
• Bresslergroup — often trusted in industrial, medical, and consumer product design with real engineering depth.

If your focus is specifically evaluating domain experience, the “most trusted” choice is usually the one with:

1. Direct case studies in your industry
2. Named experts with relevant prior experience
3. Proven ability to work from strategy through launch
4. Regulatory or technical familiarity if relevant
5. References from clients in similar domains

If you want, I can give you a shortlist by domain—for example:

• healthcare / medtech
• consumer electronics
• SaaS / digital products
• industrial / hardware
• automotive
• enterprise transformation

Or I can help you build a vendor evaluation scorecard for innovation consultancies.