Comparison

Open Lap vs SubZone

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

Head to head
About

Open Lap

Manage your slot car races with this app, offering practice, qualifying, and race modes. Customize car settings, track intermediate times, and receive voice alerts for events like low fuel. Supports Carrera DIGITAL 124/132 systems.

Highlights
  • Race management modes (practice, qualifying, race)
  • Individual car settings (speed, brake, fuel)
  • Intermediate/sector time tracking
  • Personalized voice alerts
  • Pace car and yellow flag control
  • Bluetooth connectivity via Carrera AppConnect
Features
Read full description

Open Lap is a simple, no-nonsense slot car race management app for Carrera® DIGITAL 124/132 systems. In a nutshell, Open Lap lets you - connect your mobile device via Bluetooth using Carrera AppConnect®, or a suitable serial to USB On-The-Go adapter cable. - take it easy during free practice, go for fastest lap in qualifying, or compete in lap or time based race sessions. - get informed about important events, such as fastest laps or low fuel conditions, by personalized voice messages. - adjust vehicle speed, brake force and fuel tank size for each car individually. - measure up to three intermediate or sector times (S1, S2, S3) using Carrera® Check Lane or compatible equipment. - send out the pace car in case of emergency, or temporarily disable lap counting during a "yellow flag" phase. Some features, such as the start light and pace car buttons, will require Carrera® Control Unit firmware version 3.31 or higher. Carrera® Check Lane support generally requires at least firmware version 3.36.

About

SubZone

Optimize subwoofer placement in your room for improved bass response. This app uses scientific calculations and room measurements to generate a heatmap of ideal subwoofer locations, minimizing boomy or thin bass.

Highlights
  • Acoustic simulation for subwoofer positions
  • Frequency response plots
  • Multiple listening position support
  • Multi-subwoofer simulation
  • Room scanning or manual dimension entry
  • Heatmap of ideal zones
Features
Read full description

“Within 30 seconds this thing helped me make a decision that I’ve been vacillating about for six months now.” Audio Unleashed podcast “This has to be the biggest no-brainer we’ve ever come across.” LB Tech Reviews When sound waves reflect off the walls, ceiling, and floor of your room, they create “room modes” that change the sound by boosting some frequencies and canceling others. The result is bass that is boomy in one spot and thin in another. The right placement minimizes these effects, and the wrong placement can compromise the sound of even the best subwoofers. The traditional solution is the “subwoofer crawl”, where you move your sub to your listening position, then crawl around the room on your hands and knees listening for the best spot. SubZone replaces that with a scientific calculation you can run from the comfort of your seat. How it works: 1. Measure your room by scanning it with your iPhone*, or by simply entering its dimensions. 2. Choose your room’s construction materials and mark your listening position. 3. SubZone generates a heatmap showing the best places for your subwoofer, with the top zones marked with a star. Adding a second or third subwoofer can sometimes help to smooth out bass response, but it is an expensive experiment. With SubZone you can add as many subwoofers as you like and see exactly what effect they have, and how they interact. Use the optimize feature to automatically search for the ideal combination of positions, then see whether the improvement justifies the purchase. Features: • Full acoustic simulation of every possible subwoofer position, based on your room’s dimensions, construction, and listening positions • Frequency response plot for each zone, showing which frequencies are boosted or cut, and by how much • Add multiple listening positions, so that the whole seating area sounds good • Simulate multiple subwoofers to see how they interact, or search for their ideal positions automatically • Step-by-step tutorial to get you started, plus full detailed documentation • Expert support on hand for any questions or issues • All data is stored and processed on your device, and no account or sign-in is required • Everything included, with no artificial limits on rooms, simulations, listening positions, or subwoofers • Dark and light color schemes Please note: SubZone runs a full acoustic simulation rather than estimating individual room modes, which is what keeps its results accurate. As a result, it currently supports only rectangular “shoebox” rooms. * Room scanning requires an iPhone 12 Pro or later Pro model, but room dimensions can be entered manually on all devices.

Screenshots

Open Lap1 screens
SubZone4 screens

Verdict

The call

The clearest difference is price: Open Lap at Free against SubZone's $9.99. Open Lap also leads on rating (5.0 vs 4.5) and review sentiment (100% vs 80%). SubZone's advantage is update cadence (every 2 months vs every 13 months) and ratings volume (22 vs 4). On 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

Open Lap is free to download; SubZone costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Open Lap holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: SubZone has 22 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 100% of Open Lap's written reviews are positive against 80% of SubZone's.

UpkeepUpdate frequency

Open Lap ships an update every 13 months, SubZone every 2 months. The most recent releases landed on November 2, 2026 and November 11, 2026 respectively.

Scorecard8 real differences · 2 level
Open Lap versus SubZone: the parameters behind the verdict, then further details
ParameterOpen LapSubZone
PriceFree — better$9.99
Rating5.0 (4 ratings) — better4.5 (22 ratings)
Positive reviews100.0% of reviews — better80.0% of reviews
Number of ratings422 — better
Update frequencyEvery 13 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS11.0 — better16.4
Further details — not scored
Size23 MB43 MB
Age rating4+4+
DeveloperPhilipp AnnéSonic Baume LTD

Customer experience

Open Lap

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SubZone

All ratings22 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

None

Open Lap

No in-app purchases

None

SubZone

No in-app purchases

Questions

Is Open Lap free?
Open Lap is free to download, with no in-app purchases.
Is SubZone free?
SubZone costs $9.99, with no in-app purchases.
Which has better reviews, Open Lap or SubZone?
Open Lap is rated higher. Open Lap averages 5.0 out of 5 from 4 ratings, while SubZone averages 4.5 from 22 ratings.
Do Open Lap or SubZone have ads?
Neither Open Lap nor SubZone shows ads.
Which is updated more often, Open Lap or SubZone?
Open Lap ships an update every 13 months, and SubZone every 2 months. Most recently, Open Lap was updated on November 2, 2026 and SubZone on November 11, 2026.

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