WHATSIZE is a specialized apparel and shoe size converter for global shoppers, available as a paid utility on iOS and a free tool on Android.
The App DNA
What makes this app unique?
Users hire WHATSIZE to eliminate the guesswork and return costs associated with international and brand-specific sizing, relying on its offline-first, privacy-focused mechanism to ensure accuracy in dressing rooms.
For Global shoppers who frequently purchase clothing online or internationally and want to minimize return shipping costs.
What does it look like?
Key features
Calculates size recommendations between specific brands using official measurement charts
Performs all size conversions locally without requiring an internet connection
Saves user and family size profiles for quick reference during shopping sessions
How much does it cost?
The app uses a one-time purchase model to emphasize privacy and the absence of subscriptions or ad-tracking.
Velocity
Intense developmentShow more...
4 versions in history. Development pace: intense.
Who built it?
User Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for WHATSIZE: Brand Size Converter
How's the Utilities market?
WHATSIZE sits at #78 Paid in the French Utilities category, a position that reflects its niche focus. The lack of rating data on iOS signals a need for aggressive acquisition of social proof to compete with general-purpose converters.
Read the market outlookThe rivals identified
By Arsosa Network Inc.
This app serves the exact same niche of specialized apparel sizing conversion with a focused utility approach.
- Provides static reference charts for quick visual lookup rather than just dynamic brand-to-brand conversion logic.
- Maintains a higher release cadence with three updates in the last six months to ensure sizing accuracy.
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Access the full report for freeThe Analyst's Read
Key takeaways for WHATSIZE: Brand Size Converter
Where is it heading?
Users report: The market for apparel conversion is consolidating around general-purpose tools that offer broader utility, leaving niche apps like WHATSIZE exposed if they cannot maintain superior data accuracy. The PM must transition from a static utility to a community-validated tool to survive the competition from legacy converters.
- The latest branding update signals active maintenance, but the lack of user reviews suggests the growth engine is currently stalled.
- Competitors with higher update cadences threaten to outpace WHATSIZE on brand-specific sizing accuracy, which will erode the primary value proposition over time.
The SWOT
- Offline-first architecture ensures utility in dressing rooms
- Privacy-first design removes ad-tracking friction
- Partnering with niche retailers for official sizing data
- Adding wearable integration for quick-access sizing
Next best moves
Implement an automated review prompt because the current zero-rating state on iOS prevents social proof → increase conversion velocity.
The counter-intuitive read
The app's offline-first design is not just a feature…
Read the full takeFeature gaps
Static reference charts for quick visual lookup (available in Shoe Size Converter & Chart but missing here)
Since the last report: The app has refined its market positioning toward privacy and offline utility while identifying critical gaps in social proof and competitive feature parity.
Bottom line
WHATSIZE holds a unique niche through its offline-first utility, but the lack of social proof and recurring revenue limits its growth, so the PM must prioritize building a review-capture loop to validate the $2.99 price point.
Unlock 2 critical frictions, 2 market threats and the analyst’s take.
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