Ruler vs E
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ruler
Measure lengths, widths, and diagonals accurately using your phone. Switch between metric and imperial units, and utilize flexible starting points for precise measurements in any direction. Features auto-calibration for minimal error and a screen lock to preserve readings.
- Multi-mode measurement (CM, MM, Inches, Fractions)
- Flexible starting points
- Full-direction measurement (horizontal, vertical, diagonal)
- Auto-calibration for accuracy
- Screen lock for preserving readings
- Ad-free VIP option
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Ditch bulky tools! Measure lengths, widths, and diagonals precisely anywhere with just your phone. *** Features *** ► Smart Multi-Mode Measure * Switch units freely: cm/mm, inch/fractions, with dual-unit display for instant comparison. * Flexible starting points: Measure from screen edges or device edges for diverse scenarios. * Full-direction coverage: Horizontal, vertical, or diagonal measurements. Paired with the 2.54m ultra-long scroll ruler, no corner is beyond reach! ► Zero-error Guarantee * Auto-calibration tech: Dynamically adjusts based on device model, ensuring ≤1% error rate. * Screen lock: Freeze measurements instantly to prevent accidental touches or slips. ► Contact Us * Email: ceo@noadit.com
E
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依托互联网技术，基于普通网络(3/4G,WIFI)条件下，实现移动终端手术室信号观看和远程指导的交互式解决方案 Your remote communication tool with the operating room during live broadcasts and media transmissions that is tailored to your daily activities in clinical research and clinical practice.
Screenshots
Verdict
The clearest difference is ads: E at none against Ruler's shown. E also leads on iOS requirement (12.0 vs 17.0). Ruler's advantage is update cadence (every 3 weeks vs every 6 months). On price, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Ruler ships an update every 3 weeks, E every 6 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | Ruler | E |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (79 ratings) — better | — |
| Positive reviews | 40.0% of reviews | — |
| Number of ratings | 79 — better | — |
| Update frequency | Every 3 weeks — better | Every 6 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad — better | iPad |
| Requires iOS | 17.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 53 MB |
| Age rating | 4+ | 17+ |
| Developer | Noadit, Inc. | XinGuang Technology Co.,Ltd. |
Bugs and requests
Ruler
Reported bugs
9 issues- Ads pop up constantly, making app unusable
- Ads overlay the ruler/measurements
- App crashes constantly
- Black screen issue
- Inaccurate measurements (especially inches)
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- Paid no-ad version no longer works
- Calibration issues on specific devices
- Numbers are upside down
- Doesn't work with 10.5" iPad
Requested features
12 requests- Option to remove ads via one-time purchase
- Ability to calibrate the ruler
- Offset crosshairs to see numbers
- Fractional inch (1/8, 1/16) display option
- Option to hide ruler digits
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- Support for larger screen sizes (e.g., 10.5" iPad)
- Ability to scroll and see more than screen size
- Automatic screen size detection
- Landscape orientation support
- Add more measurement tools (plumb bob, seismometer, etc.)
- Option to hide calculator and other unwanted features
- Add click on every 1/10 of an inch in setup
E
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ruler
No in-app purchases
E
No in-app purchases
