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Comparison

SJI vs EMF Scan

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

Head to head
SJI - UWBApplication
SJI
Free
πŸ”§ Utilities
No ratingsView app β†’
EMF Scan
EMF Scan

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Free
πŸ”§ Utilities
No ratingsView app β†’
About

SJI

Features
Read full description

If the user has a normal functioning UWB Tag, the app can connect with the tag to obtain the distance, azimuth, and elevation between the tag and the connected phone

About

EMF Scan

Features
Read full description

Measure electromagnetic fields (EMF) in real time using your smartphone's built-in magnetic sensor. [Key Features] β€’ Real-time magnetic field strength display (switch between Β΅T / mG) β€’ Automatic saving of measurement data and history management β€’ Map view of measurement locations β€’ Sound alarm (volume changes with field strength) β€’ Color themes (11 in total β€” dark and light pastel) β€’ Ad-removal option (one-time purchase; also unlocks some color themes) [Great For] β€’ Anyone concerned about magnetic fields around home appliances or power lines β€’ Anyone who wants an easy alternative to a dedicated EMF meter β€’ Anyone who wants to record and manage measurement data * This app uses your smartphone's magnetic sensor. Its accuracy differs from that of a dedicated measuring instrument.

Screenshots

SJI4 screens
EMF Scan4 screens

Verdict

The call

The clearest difference is in-app purchases: SJI at none against EMF Scan's 1. SJI also leads on ads (none vs shown). EMF Scan's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. EMF Scan sells 1 one-off in-app purchase. SJI asks for nothing beyond the download.

UpkeepUpdate frequency

SJI ships an update every 2 weeks, EMF Scan weekly. Both last shipped on September 10, 2026.

Scorecard3 real differences Β· 3 level
SJI versus EMF Scan: the parameters behind the verdict, then further details
ParameterSJIEMF Scan
PriceFreeFree
Update frequencyEvery 2 weeksWeekly β€” better
AdsNo β€” betterYes
In-app purchasesNo β€” betterYes
DevicesiPhone, iPodiPhone, iPad, iPod β€” better
Requires iOS15.013.0 β€” better
Further details β€” not scored
Size1 MB29 MB
Age rating4+4+
DeveloperSJI Co.,LtdYasuhiro Kodama

In-app purchases

None

SJI

No in-app purchases

1 purchases

EMF Scan

One-time1
  • εΊƒε‘Šγ‚’ε‰Šι™€$0.99

Questions

Is SJI free?
SJI is free to download, with no in-app purchases.
Is EMF Scan free?
EMF Scan is free to download, with in-app purchases available.
Do SJI or EMF Scan have ads?
EMF Scan shows ads; SJI does not.
Which is updated more often, SJI or EMF Scan?
SJI ships an update every 2 weeks, and EMF Scan weekly. Most recently, SJI was updated on September 10, 2026 and EMF Scan on September 10, 2026.

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