Comparison

Radar Performance vs Perimeter

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

Head to head
About

Radar Performance

This application calculates the geometry of aircraft weather radar beams relative to Earth, the freezing level, and the "bright band" for optimal weather detection. It identifies areas on the radar display where the beam is too high or low for effective weather detection and highlights potential ground returns.

Highlights
  • Calculates weather radar beam geometry
  • Considers Earth and freezing level
  • Identifies optimal detection altitudes
  • Shows areas of ineffective beam coverage
  • Highlights potential ground returns
  • Supports various radar models
Features
Read full description

Radar Performance calculates the geometry of aircraft weather radar beams with respect to the earth, the freezing level, and the band of altitudes that provide the maximum weather radar returns (the "bright band"). It also shows the areas on the radar display where the beam is too high or low to effectively detect active weather and areas where you may see ground returns. Radar Performance also includes an Overfly mode for confirming that the tops of lower-level convective weather remain safely below your aircraft. You choose a safe clearance altitude and a tactical range, and the app calculates the radar tilt at which the bottom of the beam just reaches that altitude at that range. With this tilt set, any weather returns indicate that the tops have penetrated your safety margin, so going around the weather is advised. Overfly mode is available at aircraft altitudes of 15,000 ft and above, and is inspired by Tom McGrath's "Snowplow" technique. Radar Performance supports a variety of weather radar models as well as a "generic" model. It is not specific to any aircraft type.

About

Perimeter

This AI-powered security app detects potential threats before they occur. It uses unique lights and sounds to warn individuals and deter crime before it happens.

Highlights
  • AI threat detection
  • Proactive crime deterrence
  • Neighbor Safe™ lights
  • Audible warnings
  • Driveway monitoring
Features
Read full description

Finally, deter theft before it happens. By detecting and warning people before they enter your driveway, your AI named Ava can determine whether to deter any would-be criminals using unique Neighbor Safe™ lights and sounds.

Screenshots

Radar Performance3 screens
Perimeter4 screens

Verdict

The call

The clearest difference is update cadence: Perimeter at every 3 weeks against Radar Performance's every 2 months. Perimeter also leads on monetization model (free vs ad-supported) and iOS requirement (11.0 vs 16.0). On price, rating, ratings volume and ads 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.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Radar Performance against 5.0 for Perimeter. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

UpkeepUpdate frequency

Radar Performance ships an update every 2 months, Perimeter every 3 weeks. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

Scorecard3 real differences · 7 level
Radar Performance versus Perimeter: the parameters behind the verdict, then further details
ParameterRadar PerformancePerimeter
PriceFreeFree
Rating5.0 (4 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews—
Number of ratings4 — better2
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.011.0 — better
Further details — not scored
Size8 MB54 MB
Age rating4+4+
DeveloperPOH Performance L.L.C.PERIMETER AI INC.

Customer experience

Radar Performance

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Perimeter

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Radar Performance

No in-app purchases

None

Perimeter

No in-app purchases

Questions

Is Radar Performance free?
Radar Performance is free to download, with no in-app purchases.
Is Perimeter free?
Perimeter is free to download, with no in-app purchases.
Which has better reviews, Radar Performance or Perimeter?
Radar Performance and Perimeter are both rated 5.0 out of 5 on the App Store, from 4 and 2 ratings respectively.
Do Radar Performance or Perimeter have ads?
Neither Radar Performance nor Perimeter shows ads.
Which is updated more often, Radar Performance or Perimeter?
Radar Performance ships an update every 2 months, and Perimeter every 3 weeks. Most recently, Radar Performance was updated on October 12, 2026 and Perimeter on October 7, 2026.

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