Devibi

Devibi is a UK-registered web and mobile app development agency. We build custom web apps, mobile apps, and AI tools for SaaS founders, UK law firms, estate agents, and accounting firms — on a fixed price, with weekly working demos, using a senior-only team.

What we build

We specialise in custom software that off-the-shelf tools can't cover. That means SaaS products, client portals, AI-powered workflow tools, case management systems, document automation, and bespoke CRM platforms. Every project is scoped in detail before build begins, so clients always know the cost, the timeline, and what they're getting.

How we work

We work in one-week sprints. Every Friday, clients see a demo of working software — not a status update or a slide deck. Every feature has written acceptance criteria before a single line of code is written. Clients have full access to the project board throughout. If something changes, they hear about it the same day.

Our engagement models:

Fixed-scope projects - defined deliverables, timeline, and price agreed upfront. Best for Launch Blueprint, MVP Sprint, and Practical AI Pilot engagements.

Dedicated team - a senior squad embedded with the client's team for ongoing product development and continuous improvement.

• Our services
• Launch Blueprint — validate an idea and get a fixed-price MVP scope in 7 days
• MVP Sprint — go from approved scope to a live product in 8–12 weeks
• Practical AI Pilot — build and deploy a real AI tool in 6–10 weeks
• Activation Lift — improve onboarding, retention, and conversion with data-led experiments
• Who we work with
• SaaS founders building their first product or improving an existing one
• UK law firms needing client intake portals, document AI tools, or case management systems
• UK estate agents that have outgrown off-the-shelf CRM and need custom-built tools

UK accounting firms building client portals, workflow automation, or Xero/Sage integrations

• Why clients choose us
• Senior team only — no juniors, no offshore handoffs