Ruler vs smart LK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ruler
This utility app uses augmented reality to measure lengths and areas in the real world. Simply point your device's camera to get accurate measurements.
- Augmented reality measurement
- Measure length
- Measure area
- Simple interface
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A simple AR ruler for length and area measurements.
smart LK
Control your smart lock remotely with this app. It supports unlocking via password and offers security alerts for brute-force attempts on fingerprint locks, ensuring property safety.
- Remote unlocking
- Password lock support
- Brute force crack alerts
- Property safety notifications
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Welcome to use our company's smart lock. This App needs to be used with our company's smart lock Supports App remote unlocking, password lock and other unlocking methods. When the fingerprint lock finds that there is a brute force crack, it will send a message to the user to ensure the safety of the user's property.
Screenshots
Verdict
The clearest difference is rating: smart LK at 5.0 against Ruler's 4.5. smart LK also leads on update cadence (monthly vs every 3 months). Ruler's advantage is ratings volume (4 vs 1). On price, ads, in-app purchases and monetization model 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.
smart LK holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 4 and 1 respectively.
Ruler ships an update every 3 months, smart LK monthly. Both last shipped on November 3, 2026.
| Parameter | Ruler | smart LK |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (4 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 | 11.0 |
| Further details — not scored | ||
| Size | 22 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Play, Inc. | libing yang |
Customer experience
Ruler
smart LK
In-app purchases
Ruler
No in-app purchases
smart LK
No in-app purchases
