Comparison

GPF Bubble Level vs Sensor

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

Head to head
About

GPF Bubble Level

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GPF Bubble Level is a minimal, high-contrast spirit level app for iPhone, built around real-time accelerometer data. It uses Core Motion to read device gravity and translates movement into a smooth on-screen bubble inside a circular level grid. The interface is intentionally clean: black background, white elements, Menlo typography, and a compact layout designed for quick visual alignment in everyday use. Key features: - Real-time level detection using accelerometer/device motion - Smooth bubble movement with light filtering for stability - Tilt angle readout in degrees - Live X/Y gravity values for reference - Dedicated Info screen with app icon, title, and version/build footer - Custom monochrome app icon (white on black) consistent with the app style Design goals: - Fast glanceability - No clutter - Strong visual contrast for indoor/outdoor visibility - Coherent monochrome identity across UI and iconography Technical notes: - SwiftUI-based UI - CoreMotion integration via observable motion manager - Motion privacy usage description configured - Build/version shown directly from bundle metadata This app is ideal for quick leveling checks on surfaces, shelves, frames, and small DIY tasks, with a focused UX that prioritizes readability and responsiveness.

About

Sensor

Features
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SensorStream turns your iPhone and Apple Watch into real-time motion sensor tools. Select a device, choose the sensor streams you need, and view smooth live graphs with sampling- rate information. Record sessions locally and export the captured data as CSV files for analysis, research, testing, or development. Features include: • iPhone and Apple Watch sensor streaming • Accelerometer and gyroscope data • Gravity and magnetic-field measurements • Pitch, roll, yaw, quaternions, and rotation matrices • Live sampling-rate display • Selectable sensor channels • Smooth, full-width graphs • Local recording with pause and resume controls • CSV file sharing and deletion • Light and dark appearance support Available streams depend on the selected device and its hardware capabilities. SensorStream excludes HealthKit-dependent biometric data.

Screenshots

GPF Bubble Level3 screens
Sensor4 screens

Verdict

The call

GPF Bubble Level and Sensor are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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.

ScorecardNo meaningful differences
GPF Bubble Level versus Sensor: the parameters behind the verdict, then further details
ParameterGPF Bubble LevelSensor
PriceFreeFree
AdsNoNo
In-app purchasesNoNo
DevicesiPhoneiPhone, Apple Watch — better
Requires iOS18.618.0 — better
Further details — not scored
Size0 MB30 MB
Age rating4+4+
DeveloperGian Paolo FontaniYerim Lab LLC

In-app purchases

None

GPF Bubble Level

No in-app purchases

None

Sensor

No in-app purchases

Questions

Is GPF Bubble Level free?
GPF Bubble Level is free to download, with no in-app purchases.
Is Sensor free?
Sensor is free to download, with no in-app purchases.
Do GPF Bubble Level or Sensor have ads?
Neither GPF Bubble Level nor Sensor shows ads.

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