Comparison

Sumpple SmartBell vs Ruler

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

Measure anything

About

Sumpple SmartBell

Features

Read full description

A P2P IP DoorBell's Viewer.

About

Ruler

Features

Read full description

Turn your smartphone screen into a precise ruler. Measure real lengths with a simple touch and drag. 【Key Features】 - Touch & drag to measure lengths instantly - Switch between cm and inch units - Real-time measurement display - Automatic PPI detection for accurate results 【Precision Calibration】 - Credit card (85.6mm) calibration for pinpoint accuracy - Saved calibration — set it once, measure anytime - Optimized accuracy per device 【Easy-to-Use Design】 - Clean ruler interface with clear markings - Dark mode support - 10 languages supported - Intuitive unit toggle 【Perfect For】 - Quick measurements when you don't have a ruler - DIY, crafts, and sewing projects - Furniture placement and space planning - Students and professionals on the go No need to carry a ruler — measure anything, anywhere with your phone!

Screenshots

Sumpple SmartBell2 screens

Ruler3 screens

Verdict

The call

The clearest difference is iOS requirement: Sumpple SmartBell at 8.0 against Ruler's 13.0. On price, update cadence, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Sumpple SmartBell ships an update every 6 weeks, Ruler every 2 months. The most recent releases landed on October 6, 2026 and October 18, 2026 respectively.

Scorecard1 real difference · 5 level

Sumpple SmartBell versus Ruler: the parameters behind the verdict, then further details
Parameter	Sumpple SmartBell	Ruler
Price	Free	Free
Update frequency	Every 6 weeks — better	Every 2 months
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPod	iPhone, iPad, iPod — better
Requires iOS	8.0 — better	13.0
Further details — not scored
Size	44 MB	23 MB
Age rating	4+	4+
Developer	小冬李	mintaek lee

In-app purchases

None

Sumpple SmartBell

No in-app purchases

None

Ruler

No in-app purchases

Questions

Is Sumpple SmartBell free?

Sumpple SmartBell is free to download, with no in-app purchases.

Is Ruler free?

Ruler is free to download, with no in-app purchases.

Do Sumpple SmartBell or Ruler have ads?

Neither Sumpple SmartBell nor Ruler shows ads.

Which is updated more often, Sumpple SmartBell or Ruler?

Sumpple SmartBell ships an update every 6 weeks, and Ruler every 2 months. Most recently, Sumpple SmartBell was updated on October 6, 2026 and Ruler on October 18, 2026.