Comparison

K.O. II Calc. vs EMF Meter

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

Head to head
About

K.O. II Calc.

Features
Read full description

Calculator with the look and feel of Teenage Engineering’s K.O. II

About

EMF Meter

Monitor electromagnetic field levels and Bluetooth exposure with real-time readings and safety zone indicators. Understand signal strength and exposure levels around you for awareness at home, work, or while traveling.

Highlights
  • Real-time EMF readings
  • Bluetooth device scanning
  • Signal strength in dBm
  • Safety zone indicators
  • Visual EMF analytics
  • Dark and light themes
Features
Read full description

EMF Meter helps you monitor electromagnetic field levels and Bluetooth exposure from one simple dashboard. Use your iPhone’s magnetometer to track EMF changes in real time, then scan nearby Bluetooth devices to understand signal strength and exposure levels around you. Track your environment at home, work, or while traveling with clear meters, safety zones, and simple exposure insights. Key Features: Real-Time EMF Meter Live electromagnetic field readings in microteslas (ΞΌT) Uses your device magnetometer Auto-calibration for local magnetic baseline Total EMF safety meter with clear status levels Bluetooth EMF Exposure Scan nearby Bluetooth devices View Bluetooth signal strength in dBm See Bluetooth exposure percentage Safety levels: SAFE, CAUTION, UNSAFE Detailed nearby device list Safety Levels SAFE: Low exposure CAUTION: Noticeable exposure UNSAFE: Strong exposure DANGER: Very high EMF levels for magnetic field readings Visual EMF Analytics Glowing animated safety background Radial meter with color-coded zones Lowest, average, and highest session readings Simple exposure tables Clean dark and light themes Perfect For: Monitoring EMF levels at home Checking workspaces and desks Comparing rooms and nearby electronics Reviewing nearby Bluetooth signal exposure Health-conscious users who want simple EMF awareness How It Works: EMF Meter uses your iPhone’s built-in magnetometer to measure electromagnetic field variation around your device. For Bluetooth, the app scans nearby wireless sources and estimates exposure from signal strength. Privacy: All readings are processed on your device. No ads, no subscriptions, and no unnecessary tracking. Note: Phone sensors are useful for awareness and comparison, but they are not a replacement for certified scientific or medical equipment. For professional safety testing, use calibrated instruments and consult qualified experts.

Screenshots

K.O. II Calc.2 screens
EMF Meter2 screens

Verdict

The call

The clearest difference is price: K.O. II Calc. at Free against EMF Meter's $0.99. K.O. II Calc. also leads on update cadence (monthly vs every 2 months). EMF Meter's advantage is in-app purchases (none vs 2) and device support (3 vs 1). On ads 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

K.O. II Calc. is free to download; EMF Meter costs $0.99 up front. K.O. II Calc. sells 2 one-off in-app purchases. EMF Meter asks for nothing beyond the download.

UpkeepUpdate frequency

K.O. II Calc. ships an update monthly, EMF Meter every 2 months. The most recent releases landed on October 14, 2026 and November 5, 2026 respectively.

Scorecard5 real differences Β· 3 level
K.O. II Calc. versus EMF Meter: the parameters behind the verdict, then further details
ParameterK.O. II Calc.EMF Meter
PriceFree β€” better$0.99
Positive reviewsβ€”100.0% of reviews
Update frequencyMonthly β€” betterEvery 2 months
AdsNoNo
In-app purchasesYesNo β€” better
Monetizationβ€”Paid
DevicesiPhoneiPhone, iPad, iPod β€” better
Requires iOS18.613.0 β€” better
Further details β€” not scored
Size1 MB58 MB
Age rating4+4+
DeveloperJesus Evert Corral PedrazaPPLST Tech

In-app purchases

2 purchases

K.O. II Calc.

One-time2
  • Espresso coffee$1.99
  • Cappuccino coffee$2.99
None

EMF Meter

No in-app purchases

Questions

Is K.O. II Calc. free?
K.O. II Calc. is free to download, with in-app purchases available.
Is EMF Meter free?
EMF Meter costs $0.99, with no in-app purchases.
Do K.O. II Calc. or EMF Meter have ads?
Neither K.O. II Calc. nor EMF Meter shows ads.
Which is updated more often, K.O. II Calc. or EMF Meter?
K.O. II Calc. ships an update monthly, and EMF Meter every 2 months. Most recently, K.O. II Calc. was updated on October 14, 2026 and EMF Meter on November 5, 2026.

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