Report updated Jun 25, 2026
WHATSIZE: Brand Size Converter
For global shoppers who frequently purchase clothing online or internationally and want to minimize return shipping costs.
WHATSIZE: Brand Size Converter is an established utilities app that is a paid app.
What is WHATSIZE: Brand Size Converter?
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.
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.
Current Momentum
v2.0 · 3w ago
Intense- Updated branding to WHATSIZE: CLOTHING.
- Added App Store rating prompt.
What makes this app unique?
What Does It Look Like?
What Are The 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?
- One-time purchase at $2.99
The app uses a one-time purchase model to emphasize privacy and the absence of subscriptions or ad-tracking.
Who Built It?
Simplifying global apparel shopping by providing accurate, brand-specific size conversions. Eliminates sizing uncertainty for consumers purchasing across international brands.
Portfolio
1
Apps
Explore the full Ashby report
Portfolio breakdown, audience, momentum, and every app published by Ashby.
What do users think recently?
Analysis in progress, available soon
What is the competitive landscape for WHATSIZE: Brand Size Converter?
Where is it available?
Localized markets (20)
How's The Utilities Market?
WHATSIZE operates as a paid utility in the Utilities category, currently holding a #78 Paid rank in the French market. The app differentiates itself from general-purpose unit converters by focusing exclusively on apparel and shoe sizing, a strategy that targets high-intent shoppers looking to minimize return shipping costs.
How does it evolve in 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.
Rank progression
1 active ranking tracked — 30-day window
The rivals identified
Nemeses(1)
This app serves the exact same niche of specialized apparel sizing conversion with a focused utility approach.
Differentiators
- 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.
Same space(2)
A legacy productivity tool that competes for the same 'conversion' search intent but lacks specialized apparel focus.
Differentiators
- Features a dark-mode optimized interface that prioritizes general utility over the specific brand-matching needs of fashion shoppers.
- Lacks recent development activity, signaling a static product lifecycle compared to the target's active brand-specific roadmap.
Operates in the broader productivity category as a general-purpose unit converter that includes clothing sizes as a sub-feature.
Differentiators
- Offers a comprehensive suite of non-apparel unit conversions that captures a much broader productivity-focused user base.
- Leverages a massive, long-standing user base to dominate search visibility for general conversion queries over niche apps.
Compare WHATSIZE: Brand Size Converter against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for WHATSIZE: Brand Size Converter
Strengths to defend, gaps to attack
Core Strengths
- Offline-first architecture ensures utility in dressing rooms
- Privacy-first design removes ad-tracking friction
Critical Frictions
- One-time purchase model limits recurring revenue
- Zero rating count on iOS limits social proof
Growth Levers
- Partnering with niche retailers for official sizing data
- Adding wearable integration for quick-access sizing
Market Threats
- General-purpose converters dominating search visibility
- Competitors with higher update cadences eroding sizing accuracy
What are the next best moves?
Implement an automated review prompt because the current zero-rating state on iOS prevents social proof → increase conversion velocity.
The app has zero ratings on iOS, which is a critical barrier for a paid utility app.
Trade-off: Push the brand-addition roadmap to next quarter to prioritize trust-building features.
A counter-intuitive read
The app's offline-first design is not just a feature, but a distribution moat that protects it from the data-privacy concerns currently plaguing ad-supported, cloud-dependent conversion tools.
Feature Gaps vs Competitors
- Static reference charts for quick visual lookup (available in Shoe Size Converter & Chart but missing here)
Key Takeaways
- The offline-first utility is a strong differentiator, but the lack of a recurring revenue stream threatens the long-term maintenance of brand-specific sizing data.
- Search visibility is currently dominated by general-purpose converters, making niche-specific brand matching the primary lever for user acquisition.
- The current lack of user ratings on iOS is a significant conversion barrier that requires immediate attention to build trust.
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.
Where Is It Heading?
Stable
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.