Inity vs Brix Labs: MVP Design With and Without Development

Founders evaluating MVP design agencies for SaaS products frequently encounter both Inity and Brix Labs. Both work with early-stage founders. Both produce high-quality design work. Both have positioned themselves as the right partner for a SaaS product that needs to be designed properly before it is built. The difference between them is not aesthetic or qualitative; it is structural. Brix Labs is a design studio: they design products with rigour and craft, and they deliver design artefacts. Inity is a design-and-development studio: the team that designs the product also builds it. This post is an honest account of what that difference means in practice — for timeline, cost, quality, and the type of founder who should choose each.

What Brix Labs Delivers

Brix Labs is a product design studio based in the US with a strong track record of SaaS product design. Their work is characterised by high visual quality, systematic design thinking, and a thorough approach to user experience research and information architecture.

A Brix Labs engagement typically includes:

• User research and competitive analysis
• Information architecture and user flow mapping
• Wireframes and interactive prototypes
• High-fidelity UI design across the product’s screens
• Design system creation: component library, design tokens, documentation
• Handoff-ready Figma files with developer notes and specifications

What it does not typically include: development. Brix Labs designs the product. Building it is the founder’s responsibility — whether through an in-house development team, a separate development agency, or freelancers.

This model works well when the development team receiving the design files is experienced, reliable, and capable of implementing design decisions faithfully without a designer present to guide them. It works less well when:

• The development team is junior or inexperienced with design-to-code fidelity
• The founder does not have an existing development team and needs to find one after the design engagement
• The design files are handed to a team that interprets rather than implements, producing a product that looks right in Figma and feels slightly off in production
• Technical constraints discovered during development require design changes, with no designer available to make them

What Inity Delivers

Inity is an integrated product design and development studio based in Zagreb, Croatia, with clients in the UK and US markets. The model is deliberately different from a design-only agency: the same team that designs the product builds it, from Discovery Week through to production deployment.

An Inity engagement typically includes:

• Discovery Week – a paid, five-day structured engagement producing a validated MVP scope, user flow maps, technical architecture review, and design-ready specification
• UX design and interaction flow mapping
• High-fidelity UI design and design system creation
• Front-end development (Next.js, React)
• Back-end development (Node.js, PostgreSQL, Supabase)
• AI feature design and integration (RAG pipelines, LLM integration, agents)
• Production deployment and ongoing support

The critical difference from the Brix Labs model: the designer who specifies the component is the same person who reviews the implementation. The developer who builds the feature is the same person who raised the technical constraint during design. There is no handoff. Design decisions survive implementation because the team making both sets of decisions is the same team.

Model Comparison

The Handoff Problem: Why It Matters More Than It Sounds

The structural difference between Brix Labs and Inity is not just organisational – it has a direct quality impact on the product that ships.

When a design studio hands files to a development team, hundreds of small decisions are made during implementation that the design did not specify. How does the loading state behave when the API is slow? What happens to the layout when a user’s name is 40 characters long? What does the error state look like when a third-party integration fails?

Developers make these decisions without a designer present. Most of them are reasonable approximations. The accumulation of reasonable approximations is what produces the gap between a product that was designed beautifully and one that feels slightly inconsistent, slightly off, slightly harder to use than it looked in Figma.

In an integrated model, these decisions are made by the designer and developer together. The designer can see the implementation. The developer can flag a constraint during design rather than working around it during development. The gap closes because the people responsible for both sides of it are the same people.

This is why founders who have experienced both models consistently describe the integrated model as faster to a production-quality product — not because it has more resources, but because it eliminates the rework that handoffs produce.

Which Should You Choose?

Choose Brix Labs if:

• You have an existing development team that you trust to implement design files faithfully and completely
• Your primary constraint is design quality and design strategy – you have the engineering side handled
• You want a dedicated design partner and are comfortable managing the design-to-development coordination yourself
• Your product is primarily a design challenge rather than a full-stack build challenge

Choose Inity if:

• You are building a product from scratch and do not have a development team
• You want one team accountable for both design and implementation quality
• You are building AI features that require design and development to be tightly integrated
• You are in a regulated vertical (HealthTech, FinTech, compliance) where design and implementation decisions need to stay in sync
• You want a structured entry point (Discovery Week) that produces a specification before any design or development work begins

Consider both if: You have a design-only engagement in mind and a development team ready to execute – Brix Labs designs, your team builds. If that combination is working, there is no reason to change it.

Conclusion

Brix Labs and Inity are both strong choices for SaaS founders who need product design expertise. The difference is what happens after design is complete. If you have a reliable development team and need high-quality design files to hand to them, Brix Labs is a strong fit. If you need a team that stays present through design and development, eliminating the handoff gap and maintaining quality from Figma to production, Inity’s integrated model is built for that. The choice is less about which agency does better design and more about which model fits your current situation and constraints.

→ Not sure which model fits where you are right now? Book a Discovery Week call with Inity – even if you have a development team, the specification that Discovery Week produces is useful regardless of who builds from it.