Best free AI interior design apps and what free means

Free means six different things here

Every app in this category uses the word free, and almost none of them mean the same thing by it. A permanent tier with no card is free. A one-day trial that charges $24 on day two is also called free. So is a credit pack you buy, a plan whose free option was removed, and a page that says “try it free” without publishing any limit at all.

The distinction matters because the failure mode is identical in each case: you photograph a room, generate three designs you like, and discover the paywall at the moment you want a fourth. Sorting the vendors by what they actually publish takes about ten minutes, and this page is the result of doing it on one day.

One methodological note, because it changes how much weight these rows deserve — the rules this site works by spell it out further. This desk did not run seven apps against the same room photograph. Every figure below is a vendor statement, read off that company’s own live page on August 14, 2026, and labeled as such. Where a vendor publishes nothing, the cell says so rather than carrying an estimate.

Free tiers as published on August 14, 2026

Two vendors publish terms a reader can plan around, and they are Spacely AI and DecorAI. Three publish an invitation without a number. One publishes an honest absence. The last one publishes nothing a machine can read, which turns out to be its own story.

The vendors whose prices a crawler cannot read

This is the finding that does not appear in other comparisons of these apps, and it is measurable rather than arguable. Fetching each vendor’s page directly and stripping the markup shows how much text actually reaches a crawler — or an AI assistant asked “how much does RoomGPT cost”.

RoomGPT is the most-searched brand in this niche and its product page returns six words of readable text. Reroom AI ships 924 kilobytes of markup carrying 210 words. Both of their pricing URLs returned 404 to a direct fetch, as did Collov’s.

A page that renders its prices only in the browser has published them to customers and hidden them from every assistant those customers now ask first.

The practical consequence for a reader is simple and slightly unfair: the apps easiest to research are not the best apps, they are the ones that serve text instead of a JavaScript shell. Any comparison built purely on what is readable, including this one, inherits that bias, which is why the row above says “not readable” rather than “no free tier”.

Spacely AI: the only permanent free tier found

Spacely AI’s pricing page lists a Free plan at $0, described as free forever, carrying 40 trial credits, access to all features, high-resolution download, private mode, a commercial license and watermark-free output. Signup states no credit card required. Its paid path is credits rather than a subscription: 200 for $9, 1,000 for $35, 5,000 for $150, stated as roughly 100, 500 and 2,500 renders respectively, and stated not to expire.

Two credits per render is the implied rate from those figures, which puts the free allowance at around twenty designs. That is the largest no-card allowance published by any vendor in this sweep, and it comes with commercial rights that most trials withhold.

The caveat is that its free plan is listed as trial credits rather than a recurring monthly grant. Free forever describes the plan, not a refill, so the 40 credits appear to be a one-time allocation — the page does not state a renewal, and we did not create an account to find out.

DecorAI: three designs, then $24 a month

DecorAI publishes a one-day free trial at $0 including three AI designs, watermark-free output, access to all 20-plus tools, 175 design styles across 135 space types, 4K results, commercial usage rights and private generation mode. After the trial it is $24 per month for unlimited designs, with “no caps, no credits” stated explicitly, or $120 half-yearly.

Unlimited-for-a-flat-fee is genuinely unusual in a market that mostly meters renders, and it is the reason this vendor is worth naming even though its free window is one day. If you have a specific room and a free afternoon, three watermark-free designs at full quality is a real trial rather than a teaser.

One thing to note in DecorAI’s favor and against it at once: its site publishes a comparison table scoring rivals, including RoomGPT and Spacely. Those are a competitor’s claims about third parties, not vendor statements about themselves, so nothing from that table appears in this page.

Interior AI: no free tier, and it says so plainly

Interior AI publishes Pro at $49 per month for 1,000 interior designs, Premium at $99 for 5,000, and Ultra at $199 for 25,000, with yearly billing bringing Pro to an effective $29 per month at $349 per year. There is no free tier at any level.

That deserves less criticism than it usually gets. A vendor stating “$49, no free option” costs a reader nothing but a click, while a vendor advertising “try free” with no published limit costs an account signup to discover the same thing. Interior AI’s page is also the most complete in the category at 4,640 readable words — it is the easiest of these products to evaluate before paying, precisely because it does not pretend to be free.

What no free tier tells you

Every app in this category is good at the same thing and weak at the same thing, and no pricing table captures it. They restyle surfaces in a photograph convincingly — paint, flooring, cabinet fronts, furniture, lighting mood. They judge dimensions poorly, because a single photograph carries no reliable scale.

The consequence is specific rather than vague. A render will happily show a kitchen island in a galley kitchen that cannot physically accommodate one, or a sofa that would block the door swing. Neither the free tier nor the $199 tier fixes this, because it is a property of working from one photo rather than a property of the price.

That is why the useful workflow pairs a render with an arithmetic check. Generate the look, then measure the room and price it: the remodel cost calculator turns square footage into a budget range, and what a kitchen remodel costs shows where that money goes once cabinetry enters the picture.

Who should choose which

Someone previewing one room, once, with no intention of paying, should start with Spacely AI, because it is the only permanent no-card option published here and its free output carries a commercial license.

Someone mid-renovation, regenerating the same space repeatedly as decisions change, is better served by DecorAI’s $24 flat month than by any credit pack — unlimited genuinely means unlimited on that plan as published, and a renovation burns renders faster than anyone expects.

Someone staging listings professionally is looking at Interior AI’s volume tiers or Spacely’s larger credit packs, and should read the license terms rather than infer them. Virtual staging carries disclosure obligations in real estate listings that decorating your own bedroom does not.

Someone who has not yet decided what the room should look like does not need any of these yet. Designing a room from a photo covers what this class of tool can and cannot establish, and how to use AI on a room covers the order of operations that produces a usable render instead of a pretty one.

When none of these is the right tool

Three situations, stated plainly, where the answer is to close the app.

When the question is structural. Whether a wall is load-bearing, whether the plumbing can move, whether the floor takes the weight of stone — none of that is visible in a photograph, and a render showing the result implies a feasibility nobody checked.

When the budget is the actual constraint. If the real question is whether this is a $15,000 or a $45,000 project, an image answers nothing. HomeAdvisor puts the national average kitchen remodel at $26,939 against a typical range of $14,589 to $41,547, read August 14, 2026 — that spread, not the styling, is what decides most renovations.

When you are choosing paint. Screens lie about color more than any other surface, because a render cannot show what a finish does under your room’s actual light at four in the afternoon. Paint samples on the actual wall remain undefeated, and interior painting costs covers what the job runs once you have chosen.