UI reskin layer for self-hosted project management tools

The moment this becomes a real problem is when a mid-size agency or IT team realizes their project management tool works fine under the hood but looks like it was designed in 2009 — and every new hire or client they onboard comments on it. They can't switch tools without migrating years of data, but the tool itself has no strong incentive to modernize because the buyers (ops leads, IT directors) already paid for it and the vendors are focused on feature parity with competitors, not aesthetics.

The structural reason this gap persists is that UI modernization inside an existing product means touching every screen, every component, and every edge case — a huge investment for vendors who sell on features, not visuals. Agencies and IT shops feel this acutely because they're presenting these tools to clients, and the 'parking lot interface requiring excessive scrolling' or the 'lot of white/empty space' makes the agency look cheap by association. But they don't complain loudly enough to move the vendor's roadmap because they're not enterprise accounts threatening to leave.

Existing customization options in these tools — where they exist at all — let you change a logo or a color. They don't let you collapse wasted whitespace, restructure list views to show more items without scrolling, or sharpen how items and tags are laid out. The complaints here are specifically about density and clarity, not branding.

This is a business because the need recurs every time a team onboards a client, hires someone new, or the vendor ships a version that regresses the UI further. Agencies pay ongoing fees for client-facing tools to look polished — this is no different. Without it, they either absorb the embarrassment, pay a developer to maintain custom CSS hacks indefinitely, or switch tools and eat the migration cost.

What to build

Build a browser-extension and self-hosted CSS/JS injection layer that applies pre-built, maintained UI themes to specific project management tools — restructuring list density, fixing whitespace, sharpening typography — deployable per-organization without touching the vendor's codebase.

Where to start

Start with one specific tool (Advantage, which has the most vocal UI complaints in agency contexts) and one specific view (the parking lot / backlog list view) where the scrolling complaint is concrete and fixable — proving value in a single screen before expanding.

The hard part

Vendor updates can break the injection layer with every release, so you're permanently on a treadmill of compatibility maintenance — and if you support multiple tools, that treadmill multiplies before you have enough paying customers to justify it.

How it makes money

Monthly subscription per organization, priced around what a developer would charge to maintain custom CSS manually — roughly $49–$149/month depending on number of users — with a one-time setup fee for custom theme work.