How Mold Scanner AI Works: Our Methodology
We built this tool on published research, certified inspection standards, and leading expert protocols. Here is exactly how we analyze your photos and give you a verdict.
1. The 160 Point Checklist
Professional mold inspectors follow the IICRC S520 standard. We studied it cover to cover, then broke it into 160 specific things to look for across 12 rooms in a typical home.
Each room has its own hotspot list. A bathroom has different risk areas than an attic. A basement has different warning signs than a kitchen. The checklist covers everything from obvious mold growth to subtle clues like rust on light fixtures (which proves long term moisture) and paint bubbling patterns (which point to the water source).
When you scan a room with Mold Scanner AI, the app walks you through the hotspots for that specific room. You take photos of each area. The AI knows what to look for in each photo because the checklist tells it where the problems hide.
2. AI Vision Analysis
We use Gemini 2.5 Flash for the initial photo analysis. The AI looks at your photo and answers a simple question: does this look like mold, water damage, or something else?
Each room type has its own set of prompts tuned to the hotspots in that room. A photo of a bathroom ceiling gets analyzed differently than a photo of a basement wall. The AI knows that dark spots on bathroom caulk are common, but dark spots on a bedroom ceiling wall are a red flag.
Conservative bias built in: If the AI's confidence that an area is CLEAR falls below 85%, it automatically downgrades the verdict to SUSPICIOUS. We would rather flag something that turns out to be nothing than miss something real. False negatives are more dangerous than false positives.
3. The 6 Step Forensic Reasoning Chain
After the AI analyzes each photo, it runs a six step reasoning process. Each step builds on the one before it.
Type
What kind of growth is this? Surface mold, deep penetration, biofilm, efflorescence (mineral deposits that look like mold but are not), or just dirt? The AI classifies what it sees.
Duration
How long has this been here? Fresh growth looks different from growth that has been building for months. Clues like staining depth, coverage area, and surrounding damage tell the story.
Source
Where is the water coming from? Every mold problem has a moisture source. The AI looks for clues: condensation patterns, leak stains, humidity damage, plumbing proximity, and ventilation issues.
Liability
Who is responsible? For renters, this matters. The AI flags whether the issue looks like a building maintenance problem (landlord's responsibility) or a tenant use issue (your responsibility).
Health
What are the health risks? Based on the type, duration, and location of the growth, the AI assesses whether this is cosmetic only, a mild irritant, or a potential health concern that needs medical attention.
Remediation
What should you do? The AI gives you a clear action plan: clean it yourself (with specific products), hire a professional, or monitor and recheck. It tells you what to do first, second, and third.
4. The Adaptive Questionnaire
Photos only tell part of the story. After the visual analysis, the app asks you 3 to 5 short questions about your health and living situation.
The questions are informed by the BREESI screening instrument (Brief Environmental Exposure and Sensitivity Inventory).
What the BREESI is:
- Validated on more than 10,000 patients by Palmer RF et al.
- Published in the International Journal of Environmental Research and Public Health in 2021.
- Three questions that identify people who may have environmental sensitivities.
How your answers change the result:
- Your answers adjust the confidence score using Bayesian logic.
- If the symptoms you report match the visual evidence, confidence in a mold problem goes up.
- If you report no symptoms and the visual evidence is borderline, confidence stays low.
We cite BREESI as a source, we do not administer it as a clinical instrument. See our disclaimer for more on that distinction.
5. What We Cannot See
We are honest about what a photo based tool can and cannot do.
We cannot see inside your walls. Hidden mold behind drywall, inside wall cavities, and under flooring requires physical inspection. If our tool finds surface evidence that suggests hidden mold (water stains without visible growth, musty smell without visible source), we will tell you to hire a professional.
We cannot see inside your HVAC system. Mold inside air ducts and on evaporator coils requires a professional HVAC inspection. We can flag warning signs (black dust around vents, musty smell when the system runs) but we cannot confirm what is inside the ductwork.
We cannot test for mycotoxins. Identifying specific mold species and measuring mycotoxin levels requires lab testing. We can tell you what type of mold something looks like, but visual identification is not the same as lab confirmation.
When we are not sure, we say so. Every verdict includes a confidence score. If we are below 60% confident, we tell you to get a professional opinion. We would rather lose a user to a professional inspector than give someone false confidence.
6. The Expert Protocols
Our analysis draws from six recognized experts in the mold and environmental health space. Here is where they agree and where they disagree.
Where they all agree: Fix the moisture source first. No amount of cleaning matters if the water keeps coming. Keep humidity below 50%. Test before remediation if the area is large. Protect yourself during cleanup (N95 mask, gloves, goggles).
Where they disagree: Leading mold illness researchers focus on genetic susceptibility (HLA DR genes) and a strict medical protocol. Leading environmental health researchers take a gentler, whole body approach for sensitive patients. Leading naturopathic mold experts prioritize practical home steps before medical intervention. Remediation science experts focus on the remediation process itself. Environmental health advocates and genetic health researchers focus on the wellness and biohacking angle. All paths are valid. The right one depends on your situation.
We do not pick sides. We present what each expert recommends and let you decide with your doctor which approach fits your situation.
7. Our Commitment
Free while in beta for basic scans. Taking photos and getting a verdict is free during our beta. We believe everyone deserves to know if they have a mold problem, regardless of income.
No dark patterns. We do not scare you into buying something. We do not exaggerate results to push upgrades. We do not hide the "no mold found" result behind a paywall.
Photos are never stored without your consent. When you scan a room, the photo is analyzed in real time and then deleted from our servers unless you choose to save it to your account. Your home photos are your business.
We tell you when we are wrong. AI is not perfect. If our tool misses something, we want to know. Every report includes a feedback button so you can tell us if a professional inspector disagreed with our verdict. We use that feedback to make the AI better.