HadaBuddy vs OnSkin: Which Skincare Scanner Should You Actually Use?

OnSkin is one of the most-downloaded skincare scanner apps on iOS, with over 8 million users and a 4.7-star App Store rating. Scan a product, get a safety score, find out if it matches your skin. HadaBuddy does something different. Here's an honest comparison of where each app wins and where each falls short.

The short answer

Use OnSkin if you want a quick safety score on individual products, want to flag harsh or irritating ingredients before you buy, and like having a chatbot you can ask skincare questions.

Use HadaBuddy if you want a full AM/PM routine built from your shelf, with conflict detection across products, climate-aware adjustments, and the ability to scan a new product in-store and instantly see whether it fits your existing routine before you buy.

OnSkin grades products one at a time. HadaBuddy grades the whole system, both at home and at the store.

What OnSkin does well

If your goal is a one-shot verdict on a single product (especially in beauty categories beyond skincare), OnSkin covers the basics. Scan, see a safety score, get a match tag, move on.

Strengths:

• Multiple scan modes. Photo, barcode, and search-by-name. If a barcode doesn't read, you have fallbacks.
• Skin matching tag. Each product gets a "perfect match / potential / not suitable" verdict based on a skin profile.
• Haircare too. A separate Hair Lab covers shampoo and conditioner. HadaBuddy is skincare-only.
• Mainstream Western product coverage. Years of scans have built out a database that catches most US and EU drugstore brands.
• In-app AI chat. A ChatGPT-powered helper for one-off ingredient questions (gated to the paid tier).

Where OnSkin falls short

OnSkin is built around evaluating products one at a time. Once you have a shelf full of skincare, the model starts to break down.

1. It doesn't build routines.

OnSkin tells you whether a product is a match. It doesn't tell you what time of day to use it, what to put before or after it, or how it interacts with the other products you already own. After "this is a perfect match," the rest of the routine is on you.

2. No conflict detection between your products.

OnSkin scores each product against your skin. It does not check whether two of your matched products should actually be layered together. You can have a green-checked retinol and a green-checked AHA toner and OnSkin will not warn you that stacking them on the same night is a fast track to barrier damage.

3. Aggressive paywall.

App Store reviewers consistently call out that the free tier dries up after about ten scans. Premium starts at around $5.99 per week (an annual plan brings it down to roughly $40 per year). For comparison, HadaBuddy's full Pro tier is $3.99 per month or $29.99 per year, and the free tier already includes unlimited scans, ingredient analysis, and 7-day routines.

4. The safety scoring is broad.

OnSkin leans on broad ingredient risk categories rather than concentration and formulation context. A 0.05% retinal moisturizer and a 1% retinol serum get flagged the same way. Sensitive-skin users especially complain that the "not suitable" verdicts are too noisy and don't reflect how the ingredient is actually formulated.

5. No climate or seasonal awareness.

The same routine doesn't work in humid Singapore summer and dry Korean winter. OnSkin's match scores are static. They don't know where you are or what time of year it is.

6. Lighter K-beauty database.

OnSkin's coverage of Korean brands is shallower than skincare-first apps. Common brands in major US retail (COSRX at Sephora, for example) are usually fine, but more niche K-beauty brands often go unrecognized. HadaBuddy's database leans more heavily into K-beauty by design.

What HadaBuddy does well

HadaBuddy works on both ends of the routine. Scan your shelf and it generates a full 7-day AM/PM schedule from what you own. Standing in Sephora with a new serum? Scan it and HadaBuddy tells you whether it fits your current routine, conflicts with anything already on your shelf, or makes another product redundant.

Strengths:

• AI-built 7-day routines. Full AM and PM for each day, with active rotation (retinol on some nights, exfoliant on others, rest nights in between). No manual ordering.
• In-store product checks. Scan a new product before you buy. HadaBuddy compares it against your existing shelf, flags ingredient overlap or conflicts, and shows where it would slot into your AM/PM.
• Specific conflict detection. 150+ ingredient-interaction rules (curated from published cosmetic-chemistry references) for known interactions (retinol + AHA, vitamin C + benzoyl peroxide, niacinamide + direct acids), plus AI-augmented detection for edge cases on Pro.
• Climate-aware. Adjusts texture and density based on your location, season, and humidity.
• K-beauty coverage. Strong database support for COSRX, Beauty of Joseon, Anua, SKIN1004, Torriden, Laneige, Innisfree, Missha, and other Korean brands.
• On-device scanning. OCR and barcode lookup run locally. Photos never leave your phone.
• Cheaper. $3.99/month or $29.99/year for Pro. Free tier already covers scanning, ingredient analysis, and routine generation.
• Skin Advisor chat. Ask anything about your specific routine, products, or ingredients (Pro).

Where HadaBuddy falls short

• iOS only. No Android. OnSkin runs on both iOS and Android.
• Smaller user base. OnSkin has been around longer and has more ratings on the App Store.
• No haircare. OnSkin's Hair Lab covers shampoo and conditioner; HadaBuddy is skincare-only for now.
• No general AI Q&A on free tier. OnSkin's chatbot is included with their (more expensive) subscription. HadaBuddy's Skin Advisor chat is gated to Pro, but Pro itself is much cheaper.
• No "trending products" editorial. OnSkin pushes weekly product picks. HadaBuddy stays out of the recommendation business and works only with what you already own.

Feature comparison

OnSkin vs HadaBuddy: feature-by-feature comparison

Feature	OnSkin	HadaBuddy
Barcode scanner	Yes	Yes
Photo / OCR scanning	Yes	Yes
Search by product name	Yes	Yes
Per-product safety score	Yes (skin match verdict)	Yes (ingredient analysis)
AI routine generation	No	Yes (AM/PM, 7-day)
Conflict detection between your products	No	Yes (150+ rules + AI)
Climate / season awareness	No	Yes
Skin profile personalization	Match scores	Full profile-based analysis
AI chatbot	Yes (paid)	Yes (Pro)
Haircare	Yes (Hair Lab)	No
K-beauty brand database	Lighter	Strong
On-device scanning (privacy)	Cloud	On-device
iOS	Yes	Yes
Android	Yes	No
Free tier	~10 scans, then paywall	Unlimited scans, 7-day routines, basic conflict detection
Paid tier	~$5.99/week or ~$40/year	$3.99/month or $29.99/year

When to use both

They answer different questions about the same product. OnSkin scores a product against a generic safety baseline plus your skin profile: "is this clean / safe / a match for my type." HadaBuddy answers the in-context question: "does this fit my actual current routine, with the products I already use, my skin, and my season."

If you only want one app, that contrast is the question to ask. Static per-product verdicts (OnSkin) versus shelf-aware fit checks both in-store and at home (HadaBuddy).

The bottom line

OnSkin is a beauty product scanner with a chatbot bolted on. It's good at what it does, but the value of "this product is a match" decays the more products you accumulate.

HadaBuddy treats your shelf as a system. It builds the routine, flags the conflicts, and adjusts for your skin and your climate. If you've ever stared at a stack of half-used bottles and thought "I have no idea what to actually do with these," that's the problem HadaBuddy was built to solve.

Download HadaBuddy on the App Store. Free on iOS.

FAQ

Is OnSkin free?

OnSkin is free to download with limited free scans (App Store reviewers report around ten before the paywall kicks in). Premium starts at roughly $5.99 per week, with an annual option around $40 per year. There's a 3-day free trial.

Does OnSkin detect ingredient conflicts between my products?

OnSkin scores each product against your skin profile, but it does not actively check pairs of products you own for known conflicts (like retinol + AHA on the same night). HadaBuddy does this with 150+ rules across your full shelf.

Which app handles K-beauty better?

HadaBuddy has the deeper Korean-brand database (COSRX, Beauty of Joseon, Anua, SKIN1004, Torriden, Laneige, Innisfree, Missha, and more), so more K-beauty products are recognized when you scan a barcode or photo of the English ingredient list. OnSkin handles the well-distributed Korean brands that have English-language listings; coverage of niche K-beauty is thinner.

Does OnSkin generate routines?

No. OnSkin grades products and answers questions through its chatbot. It does not produce a structured AM/PM, multi-day routine from your products. HadaBuddy generates a full 7-day routine with active rotation.

Which app is better for sensitive skin?

Both apps support a sensitivity flag in the profile, but they use it differently. OnSkin will mark products as "not suitable" when an irritant is present in any concentration. HadaBuddy weighs concentration, formulation context, and your full routine, so it's less likely to over-flag a low-percentage retinal moisturizer that a sensitive-skin user can tolerate.

Is OnSkin's safety score backed by dermatologists?

OnSkin cites scientific reviewers and an internal AI scoring system. Like all single-score systems, it simplifies chemistry into a verdict, which can over-flag well-formulated products. Treat any single safety score (OnSkin, Yuka, Think Dirty) as one input, not the final answer.

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Further reading: HadaBuddy vs Yuka · HadaBuddy vs SkinSort · HadaBuddy vs Glass · Best skincare scanner apps compared · How to build a routine from what you already own