By ZOOMO
Report updated May 12, 2026
100cm Ruler
For users requiring quick, portable measurement tools for small objects or insects without carrying a physical ruler.
100cm Ruler is a well-regarded productivity app that is free with in-app purchases. With a 4.6/5 rating from 14.5K reviews, it maintains solid user satisfaction.
What is 100cm Ruler?
100cm Ruler is a productivity utility for iOS and Android that provides a digital scale for measuring small objects.
Users hire this app for immediate, portable measurement without carrying physical tools, serving a need for quick, ad-hoc dimension checks.
Current Momentum
v2024.10 · 18mo ago
Maintenance- No feature updates since 2014.
- Maintains stable 4.27 average rating.
Active Nemesis
Fragmented niche
No dominant direct rival identified yet — see Other Rivals below.
Other Rivals
7-Day Rank Pulse 🇺🇸
ProductivityNo ranking data
Rating Pulse 🇺🇸
Recent User MoodAI-powered deep analysis surfacing high-signal insights. Still in beta, accuracy improves daily. For informational purposes only.
What makes this app unique?
What Does It Look Like?
How Is The App's Momentum Right Now?
Loading...
What Are The Key Features?
Calibrates ruler scale using a credit card or coin as a reference length
Dark UI theme to reduce eye strain and save battery on AMOLED displays
Saves recorded lengths for future reference
Option to remove advertisements via the Info page
Expands ruler interface to utilize space under display cutouts and notches
How much does it cost?
- Free with ads
- Ad-free experience via IAP
Monetization relies on ad-supported free usage with a one-time purchase gate for ad removal.
Who Built It?
Enrichment in progress
Publisher profile available very soon
What other apps does ZOOMO make?
What do users think recently?
Medium confidence · 50 reviews analyzed · Based on 50 reviews. Signal may be noisy.
How did the latest release land?
What is the recent mood?
Recent user voice shows a excited sentiment.
What is the competitive landscape for 100cm Ruler?
How's The Productivity Market?
100cm Ruler occupies the 'Utility' space, competing against apps that offer broader data-scanning capabilities. The app relies on a freemium model where ad-supported usage is the default, with a one-time purchase to remove ads. This model faces pressure from competitors that offer cleaner, ad-free experiences or multi-tool utility suites.
The rivals identified
Peers
Offers a dedicated scan history management feature that the target app currently lacks entirely.
Provides a clear, ad-free monetization path which contrasts with the target app's ad-supported model.
New Kids on the Block
Clever Cleanup: Phone Cleaner
★4.8 (5)Robust Research And Development Ltd.
This app competes for the same 'Utility' screen real estate by offering maintenance-focused tools that appeal to the same productivity-minded user base.
Features real-time storage analysis and automated cleanup tools that provide higher functional value than a simple ruler.
Aggressive release cadence suggests a focus on rapid feature iteration compared to the target app's static utility.
The outtake for 100cm Ruler
Strengths to defend, gaps to attack
Core Strengths
- Calibration mechanism using physical objects provides high utility accuracy
- Single-purpose design minimizes user cognitive load
Critical Frictions
- Ad-supported model creates significant user friction
- No feature updates since 2014 release
- Lacks modern UI polish compared to current standards
Growth Levers
- Integration of AR-based measurement tools
- Expansion into B2B measurement for small-scale retail
Market Threats
- Multi-tool utility apps consolidate market share
- Ad-free competitors erode the user base
- Lack of maintenance signals abandonment to users
What are the next best moves?
Audit ad-placement frequency because ad-supported friction is the primary churn risk → improve retention
Ad-supported model creates friction; competitors offer cleaner paths.
Trade-off: Pause the IAP price-test — ad-retention has higher immediate impact.
Ship UI refresh because the 2014 design signals abandonment to users → improve perceived value
No feature updates since 2014 release.
Trade-off: Deprioritize new measurement features — UI parity is the current blocker.
A counter-intuitive read
The app's lack of updates is not just a failure but a signal of a 'finished' utility tool, yet this static nature is exactly what makes it vulnerable to modern multi-tool suites.
Feature Gaps vs Competitors
- Scan history management (available in QR Code Reader+Barcode Scanner)
- Multi-format scanning capabilities (available in QR Code Reader+Barcode Scanner)
Key Takeaways
- The app's single-purpose nature is a liability in a market favoring multi-tool utility suites.
- Monetization is currently tied to ad-removal, which provides little value to casual users who may simply churn instead of paying.
- Feature parity with modern utility apps is required to prevent further erosion of the user base.
100cm Ruler holds a niche utility position through its physical-object calibration, but the lack of updates since 2014 leaves it vulnerable to multi-tool competitors, so the PM should prioritize a UI refresh to signal active maintenance and retain the user base.
Where Is It Heading?
Declining
The utility market is consolidating around multi-tool apps that offer broader scanning and maintenance capabilities. 100cm Ruler's static, ad-gated design leaves it exposed to these competitors, so the PM must modernize the interface to prevent further user erosion.
The lack of feature updates since 2014 signals abandonment to users, which accelerates churn to modern multi-tool utility apps.
Ad-supported monetization creates friction that competitors with cleaner, ad-free paths exploit to siphon the productivity-minded user base.