Best Software for Interior Design Businesses in 2026: Projects, Sourcing, and Billing

Interior design has a software problem most generic project tools cannot solve. Every project is a long-horizon orchestration: a client signing a letter of agreement in March, contractors framing a wall in June, a sofa shipping from a North Carolina vendor in August, and a final walkthrough in October that hinges on whether the rug your client approved three months ago is actually back from being re-stocked.

The right software keeps the client portal, the spec sheet, and the PO ledger all on the same page. The wrong software turns a fifteen-room residential project into a graveyard of spreadsheets, an inbox full of vendor confirmations, and a client who is asking — politely, then less politely — where their dining chairs are.

This guide compares the platforms interior design studios most often evaluate in 2026: Deelo, Studio Designer, Design Manager, Houzz Pro (formerly Ivy), and Mydoma Studio. What each does well, where each leaves gaps, and which one fits a solo residential designer versus a 6-person commercial studio.

Generic project tools fail interior designers because they treat a project as a flat list of tasks. A design project is not a task list. It is a layered orchestration of rooms, items, vendors, approvals, and money flowing in multiple directions at once. Before you compare platforms, get clear on what the software has to handle.

Pricing reflects publicly listed tiers as of May 2026. Most platforms negotiate, change tiers, or bundle differently for multi-seat studios — always confirm current pricing on the vendor's site before committing.

Deelo takes a different angle than the rest of this list. Studio Designer, Design Manager, Houzz Pro, and Mydoma are interior-design-specific platforms. Deelo is an all-in-one business platform that a design studio configures to fit the way it actually works. CRM handles leads and active clients. Projects holds the rooms, the FF&E line items, the contractor timeline, and the approvals. Docs generates POs and design agreements from templates. ESign captures client signatures on approvals and retainers. Invoicing produces FF&E proposals with line-item markup, collects deposits and balance dues, and runs the books. Time Tracker logs hourly design work by project and phase. Helpdesk catches the inevitable 'the contractor scratched the wall' service ticket.

The setup looks like this. A project is a Deelo Project with rooms as sections or phases. Each FF&E item is a line item with custom fields for vendor, SKU, your cost, retail price, markup percentage, status (specified, approved, ordered, shipped, received, installed), ship date, and notes. A client approval is an ESign request linked to the project. A vendor PO is a Doc generated from a template with the line items merged in. A proposal to the client is an Invoice with markup applied, sent for online payment or ACH. The whole thing rolls up to a project budget and a margin report.

The math works out aggressively in Deelo's favor for small studios. A 3-designer studio runs the entire operation — clients, projects, sourcing, POs, proposals, billing, helpdesk, marketing campaigns to past clients — for $57 per month. The same studio on Studio Designer plus a CRM plus QuickBooks plus an e-sign tool plus an email marketing app is typically $300-500 per month.

The trade-off is honest. Deelo is not pre-configured the way Studio Designer is. You spend a day or two setting up your project template, your FF&E custom fields, your PO template, and your proposal layout. For studios that want everything ready-made out of the box, Studio Designer or Design Manager will get you to day one faster. For studios that want every tool the business runs on under one login at a fraction of the cost, Deelo is the lever.

Studio Designer has been the workhorse of established residential design studios for years, and the 2025-2026 platform refresh tightened the UI without changing what it is good at. Item-based projects, native vendor management, deep POs with deposits and partial receipts, time billing tied to project phases, and accounting built around the way designers actually move money — client deposits in, vendor deposits out, balances on receipt, markups recognized as revenue.

Where it shines: studios doing $1M+ in annual revenue with 50-100 FF&E line items per project. The procurement workflow is mature, the reporting cuts the way a CFO wants to see it, and the accounting layer means you are not duplicating data into a separate ledger.

Where it gives ground: it is not a CRM, not a marketing tool, and not a helpdesk. You will run HubSpot or Mailchimp alongside it. Pricing on published tiers runs in the $35-65 per seat per month range depending on plan, and ramp-up time is real — most studios budget a week of onboarding to get comfortable.

Design Manager is the choice when the studio principal cares as much about the books as the boards. The platform is built around a true double-entry accounting layer designed for the interior-design specific patterns of client retainers, vendor deposits, freight, sales tax by jurisdiction, and markups recognized on receipt. Item-based POs, vendor records, and project budgets are all first-class.

Where it shines: studios that have outgrown QuickBooks-plus-spreadsheets and want a single ledger that speaks designer. If your bookkeeper has ever asked you what 'vendor deposit on a partial receipt' means in QuickBooks, Design Manager solves that problem at the source.

Where it gives ground: the interface is more accounting-software than design-software in feel. Designers who want a beautiful client portal as the centerpiece may find it utilitarian. Pricing on published tiers sits in the $45 per user per month range with implementation costs typical for accounting-grade systems.

Houzz acquired Ivy in 2018 and folded its features into Houzz Pro, which is now the bundled offering for design pros on the Houzz platform. The pitch is two-sided: you get a full design business management toolkit (proposals, POs, client portal, 3D floor planner, time tracking) and you get plugged into the Houzz lead marketplace, where homeowners search for and contact local designers.

Where it shines: residential designers who source heavily from Houzz already, and who want the platform that owns their lead pipeline to also own their project management. The product clipper that pulls items from vendor sites is genuinely useful when you are building a 200-item spec sheet. The 3D floor planner is a real differentiator if you do not have a separate CAD tool.

Where it gives ground: pricing on the bundled tiers sits in the $85-149 per month range based on published plans, and the lead-gen part of the value is heavily location-dependent. If you do not get leads from Houzz, you are paying for a feature you will not use. The procurement and accounting depth is solid but does not match Studio Designer or Design Manager at the high end.

Mydoma Studio is built around the client experience. The portal is clean, the approval flow is friendly, and the sourcing inbox lets designers gather product options from anywhere on the web and present them as a curated proposal. Time tracking, project phases, and basic proposals are all native.

Where it shines: solo designers and 2-3 person studios doing residential work who want a platform that makes the client feel taken care of. The onboarding curve is shorter than Studio Designer or Design Manager, and the price reflects it.

Where it gives ground: procurement depth is lighter — POs and vendor management are not as developed as the residential-studio specialists. Studios with high-volume FF&E orders, complex partial receipts, or jurisdiction-by-jurisdiction sales tax will outgrow it. Published pricing tiers run roughly $59-119 per month.

Solo residential designer, 5-15 projects per year, cost-sensitive: Deelo or Mydoma Studio. Mydoma is faster to day one if you want a designer-specific tool. Deelo wins on total cost and includes a CRM, marketing, e-sign, and helpdesk that Mydoma does not.

Solo to 3-person residential studio, heavy Houzz lead source: Houzz Pro is hard to argue with if Houzz is your top channel — you get leads and operations bundled. If Houzz is not your lead source, the bundle math falls apart fast.

3-10 person residential studio doing $1-5M annual revenue, mature procurement workflow needed: Studio Designer. It is the standard for a reason — POs, vendor management, and time billing are deeper than anything else on this list.

Studio of any size where the principal is also the bookkeeper, or where the books matter as much as the boards: Design Manager. The accounting layer is the differentiator.

Studio that does residential plus light commercial, plus marketing campaigns to past clients, plus a helpdesk for warranty calls, plus a CRM for nurturing referral architects: Deelo. The all-in-one math compounds the more roles the business has to play.

Commercial-only studio doing tenant-improvement work for offices, restaurants, or healthcare clients: Deelo or Studio Designer. Commercial projects look more like construction project management — phases, drawings, RFI logs — and Deelo's Projects app plus Docs plus Time Tracker maps cleanly to that workflow. Studio Designer handles the FF&E side better; Deelo handles the broader business side better.

Numbers are rough monthly estimates based on published pricing tiers as of May 2026 and the typical adjacent-tool stack interior design studios buy alongside their primary platform. Your mileage will vary — confirm current pricing with each vendor before signing anything.