---
schema_type: "SoftwareApplication"
entity_type: "Mobile Application"
app_name: "100cm Ruler"
developer_entity: "ZOOMO Inc."
bundle_id: "jp.zoomo.SlideRuler"
app_store_id: "982815744"
google_play_id: "fr.ecp.ruler.app"
category: "Productivity"
primary_platform: "ios"
primary_monetization: "Freemium"
offline_capable: false
market_region: "US"
platforms: "iOS & Android"
app_last_updated: "2024-11-15"
report_date: "2026-05-12"
last_verified: "2026-05-12T17:01:48.229Z"
report_version: "2024.10.2"
total_reviews: 14461
overall_rating: 4.55
sentiment: "Excited"
sentiment_score: 80
confidence: "medium"
confidence_score: 0.6
review_sample_size: 50
data_age_days: 0
momentum_velocity: "maintenance"
intelligence_version: 3
competitor_count: 2
tags: ["productivity", "freemium", "excited sentiment", "mobile app", "app review", "app analysis", "users", "requiring", "quick,"]
canonical_url: "https://marlvel.ai/intel-report/productivity/100cm-ruler"
license: "CC-BY-NC 4.0"
content_version: "v2"
---

# 100cm Ruler App Audit

## TL;DR {#tldr}

- **Category**: Productivity · Freemium
- **Signal**: Rating 4.55 · Sentiment Excited

> **TL;DR:** 100cm Ruler is a productivity app by ZOOMO Inc., rated 4.55/5 by 14.5K users, with Excited user sentiment (80/100), available on iOS & Android.
>
> **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence.

<!-- speakable-start -->
> **Key Insight:** 100cm Ruler has Excited user sentiment with a 4.55/5 rating from 14.5K reviews.
<!-- speakable-end -->

## Quick Facts

| Fact | Value |
| :--- | :--- |
| **Rating** | 4.55/5 (14.5K reviews) |
| **User Mood** | Excited |
| **Category** | Productivity |
| **Developer** | ZOOMO Inc. |
| **Pricing** | Freemium |
| **Platforms** | iOS & Android |
| **Confidence** | Medium (0.6/1.0) |
| **Data Age** | 0d |

## Metadata & Market Performance
- **Publisher:** ZOOMO Inc.
- **Category:** Productivity
- **Target Audience:** Users requiring quick, portable measurement tools for small objects or insects without carrying a physical ruler.
- **Platforms:** iOS & Android
- **Version Audited:** 2024.10.2
- **Audit Date:** 2026-05-12
- **Signal Count:** 50 reviews analyzed
- **Confidence:** Medium (0.6/1.0)
- **App Store ID (iOS):** 982815744
- **Bundle ID:** jp.zoomo.SlideRuler
- **Google Play ID:** fr.ecp.ruler.app
- **Performance Trend:** Declining
- **Data Window:** Analysis based on signals collected up to 2026-05-12

<!-- section:executive-snapshot -->
## Executive Snapshot
**What it is:** 100cm Ruler is a productivity utility for iOS and Android that provides a digital scale for measuring small objects.
**Why users hire it:** Users hire this app for immediate, portable measurement without carrying physical tools, serving a need for quick, ad-hoc dimension checks.
<!-- /section:executive-snapshot -->

<!-- section:features -->
## App DNA (Features & Intent)
- **[Differentiator] Calibration via physical objects:** Calibrates ruler scale using a credit card or coin as a reference length
- **[Standard] Night mode:** Dark UI theme to reduce eye strain and save battery on AMOLED displays
  * *User Intent:* Users value self-expression and personalized experiences.
- **[Standard] Measurement history:** Saves recorded lengths for future reference
- **[Standard] Ad removal:** Option to remove advertisements via the Info page
- **[Standard] Full-screen toggle:** Expands ruler interface to utilize space under display cutouts and notches
<!-- /section:features -->

<!-- section:market-position -->
## Market Position {#market-position}

100cm Ruler maintains a stable utility presence with a 4.27 average rating across 14,461 total ratings. The lack of updates since 2014 signals a maintenance-only posture that risks losing ground to multi-tool utility competitors.
<!-- /section:market-position -->

## Monetization Strategy
- **Model:** Freemium
- **Tiers:** Free with ads, Ad-free experience via IAP
- **Analysis:** Monetization relies on ad-supported free usage with a one-time purchase gate for ad removal.

<!-- section:sentiment -->
## 🟢 User Sentiment (Medium Confidence: 14.5K reviews) {#user-sentiment}
- **Overall Rating:** 4.55/5
- **Platform Split:** iOS 4.0/5 (1 ratings) | Android 4.6/5 (14.5K ratings)
- **Overall Sentiment:** Excited

<!-- /section:sentiment -->
<!-- section:swot -->
## SWOT Analysis {#swot}

**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

<!-- /section:swot -->
## Recent Changes (v2 → v3) {#recent-changes}

The app's competitive outlook has shifted from stable to declining due to a lack of updates since 2014 and increased pressure from broader utility competitors.

**Overall trend**: Declining
**Compared at**: 2026-05-12

### High-impact changes
- **[Declined] Outlook Trend** (positioning) — Outlook trend shifted from stable to declining, reflecting increased churn risk from a lack of feature iteration.
- **[Shifted] Competitive Landscape** (positioning) — Competitive set shifted from measurement-focused rivals (e.g., AR Ruler) to general utility apps (e.g., QR Code Reader, Phone Cleaner).

### Medium-impact changes
- **[Declined] User Rating** (sentiment) — Average rating declined from 4.55 to 4.27.
- **[Added] New Weaknesses and Threats** (swot) — Added 'No feature updates since 2014' as a weakness and 'Multi-tool utility apps consolidate market share' as a threat.

<!-- section:whats-new -->
## What's New

- **Latest (v3.7.2, 1 years ago):** Added fullscreen toggle for display cutouts and improved calibration precision with 3x slower handle movement.
<!-- /section:whats-new -->

<!-- section:momentum -->
## App Momentum (Maintenance) {#momentum}

- No feature updates since 2014.
- Maintains stable 4.27 average rating.

> **Cadence:** 2 total versions · 0 majors in last 6 months · 543 days since last update · 26 days avg between updates

<!-- /section:momentum -->

<!-- section:so-what -->
## The "So What?" (Strategic Takeaway) {#so-what}

100cm Ruler is a market-leading productivity app that is free with in-app purchases.
With a 4.55/5 rating from 14.5K reviews, it delivers strong user satisfaction.

<!-- speakable-start -->
> **Bottom Line:** 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.
<!-- speakable-end -->

**Best for:** Users requiring quick, portable measurement tools for small objects or insects without carrying a physical ruler.

<!-- section:pm-actions -->
### PM Action Plan (Next Best Moves)

- [ ] [PIVOT] [HIGH IMPACT] 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: deprioritize Pause the IAP price-test — ad-retention has higher immediate impact.)_
- [ ] [INVEST] [MEDIUM IMPACT] Ship UI refresh because the 2014 design signals abandonment to users → improve perceived value — *No feature updates since 2014 release.* _(trade-off: deprioritize Deprioritize new measurement features — UI parity is the current blocker.)_
<!-- /section:pm-actions -->

<!-- section:feature-gaps -->
### 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)
<!-- /section:feature-gaps -->

<!-- section:outlook -->
### Outlook: 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.
<!-- /section:outlook -->

<!-- /section:so-what -->

<!-- section:metrics -->
## Key Metrics Summary

| Metric | Value |
| :--- | :--- |
| Overall Rating | 4.55/5 |
| Total Reviews | 14.5K |
| Sentiment | Excited (80/100) |
| Confidence | Medium |
| Pricing Model | Freemium |
| Platforms | iOS & Android |
| Key Features | 5 analyzed |
| Trend | Declining |
| Outlook | Declining |
<!-- /section:metrics -->

## Competitor Comparison

| App | Rating | Sentiment | Developer |
| :--- | :--- | :--- | :--- |
| **100cm Ruler** (this app) | 4.55/5 | Excited | ZOOMO Inc. |
| [Clever Cleanup: Phone Cleaner](https://marlvel.ai/intel-report/utilities/clever-cleanup-phone-cleaner) | 4.8/5 | N/A | Robust Research And Development Ltd. |
| [QR Code Reader+Barcode Scanner](https://marlvel.ai/intel-report/utilities/qr-code-reader-barcode-scanner) | 4.7/5 | N/A | Sabitzer OU |
| [Mitsu: AI Life Coach](https://marlvel.ai/intel-report/productivity/mitsu-ai-life-coach) | N/A/5 | Mixed | C2 Insights |
| [Pattrn - Discipline Tracker](https://marlvel.ai/intel-report/productivity/pattrn-discipline-tracker) | 4.8/5 | Excited | Pedro Schott |
| [ChatGPT](https://marlvel.ai/intel-report/productivity/chatgpt) | 4.8/5 | N/A | OpenAI OpCo, LLC |

## Company Profile
- **Developer:** ZOOMO Inc.

## Data Sources & Links
- **App Store:** [View on Apple Store](https://apps.apple.com/us/app/100cm-ruler/id982815744?uo=4)
- **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=fr.ecp.ruler.app&hl=en&gl=us)
- **Sources:** App store metadata, User reviews.

## Related Intel Reports
- [*Clever Cleanup: Phone Cleaner*](https://marlvel.ai/intel-report/utilities/clever-cleanup-phone-cleaner) (Robust Research And Development Ltd.) — 4.8/5 Rating | N/A Sentiment
- [*QR Code Reader+Barcode Scanner*](https://marlvel.ai/intel-report/utilities/qr-code-reader-barcode-scanner) (Sabitzer OU) — 4.7/5 Rating | N/A Sentiment
- [*Mitsu: AI Life Coach*](https://marlvel.ai/intel-report/productivity/mitsu-ai-life-coach) (C2 Insights) — N/A Rating | Mixed Sentiment
- [*Pattrn - Discipline Tracker*](https://marlvel.ai/intel-report/productivity/pattrn-discipline-tracker) (Pedro Schott) — 4.8/5 Rating | Positive Sentiment
- [*ChatGPT*](https://marlvel.ai/intel-report/productivity/chatgpt) (OpenAI OpCo, LLC) — 4.8/5 Rating | N/A Sentiment
- [*Whats In The Box*](https://marlvel.ai/intel-report/productivity/com-asp-whatsinthebox) (Arron Penfold) — N/A Rating | N/A Sentiment
- [*Xmind - Mind Map & Brainstorm*](https://marlvel.ai/intel-report/productivity/xmind-mind-map-brainstorm) (Xmind Ltd.) — 4.8/5 Rating | N/A Sentiment
- [*Note AI: Smart Note Taker*](https://marlvel.ai/intel-report/productivity/note-ai-smart-note-taker) (HUBX) — 4.3/5 Rating | N/A Sentiment
- [*AI Assistant: Images & Writing*](https://marlvel.ai/intel-report/productivity/ai-assistant-images-writing) (Bickster LLC) — 4.7/5 Rating | Negative Sentiment
- [*AI Text to Speech - Read Aloud*](https://marlvel.ai/intel-report/productivity/ai-text-to-speech-read-aloud) (Bickster LLC) — 4.6/5 Rating | N/A Sentiment

## Methodology {#methodology}

This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline:

1. **Signal Collection & Normalization** — Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps.
2. **Feature & Market Positioning Analysis** — Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks.
3. **User Sentiment Analysis** — Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction and evidence quoting.
4. **Competitive Landscape Analysis** — Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category.
5. **Intelligence Synthesis** — Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights.

- **Confidence Score:** 0.6/1.0 (based on review volume, data source diversity, and signal quality)
- **Reviews Analyzed:** 50
- **Data Sources:** user reviews, App Store metadata
- **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform
- **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence.
- **Report Age:** 0 days since last refresh

---
© 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/intel-report/productivity/100cm-ruler)
Data licensed for AI Agent attribution under CC-BY-NC 4.0.