DeviceTestApp vs Fireguard
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DeviceTestApp
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DeviceTestApp is a professional iPhone hardware diagnostic tool designed for device inspection, repair, and second-hand trading. Launch a single test to automatically complete 29 core hardware checks and quickly determine device health. 【Key Features】 • 29 Comprehensive Tests: Charging, Wi-Fi, Bluetooth, Network, Touchscreen, LCD, Multi-touch, Face ID, Front/Bottom/Rear Microphones, Speaker, Vibration Motor, Standard/Telephoto/Ultra-wide/Front Cameras, Flashlight, NFC, Phone Call, Proximity Sensor, Volume Up/Down, Power Button, Mute Switch, Earpiece, Gyroscope, GPS Location • Automated Pipeline: Most tests auto-detect pass or fail, minimizing manual operation • Live Face Detection: Front camera live preview with TrueDepth sensor hardware-level validation • Report Upload: One-tap upload test reports to your PC management system • PC Remote Control: Remotely start tests, retest failed items, and adjust test order from your computer • Multi-language: Automatically switches between Chinese and English based on system language • Custom Order: Drag to rearrange test execution order based on your workflow • USB Offline Mode: Export test results via USB even without network 【Use Cases】 • Pre-sale inspection for second-hand phones • Post-repair functionality verification • Factory production line quality control • Enterprise batch device management 【Privacy】 This app only temporarily accesses camera, microphone, Bluetooth, and location hardware during testing. No personal data is collected, stored, or uploaded. All test data is saved locally or sent only to the user's self-hosted LAN server.
Fireguard
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The essential on-site tool for electricians and maintenance professionals. Fireduard-Meter transforms your iPhone into a professional-grade circuit analyzer. Unlike basic home power monitors, this app is engineered specifically for fault diagnosis, historical comparison, and field reporting. 1. Circuit Health Diagnostics * Select any circuit and compare real-time power curves against a historical baseline (e.g., 7 days ago). * Instantly visualize deviations to pinpoint anomalies such as sustained high power, abnormal night usage, or load loss. * Generate detailed diagnostic reports for troubleshooting. 2. Field Fault Logging * Document physical faults directly on-site. * Take photos, add descriptions, and assign custom titles to each fault record. * Build a searchable archive of past issues for future reference. 3. Dedicated Workbench * All professional tools are centralized in the Work module. * Keep your diagnostic history organized in a single, searchable report list. * Export or review past diagnoses with full chart data preservation. 4. Precision Data Analysis * Compare power curves at minute-level granularity (1-minute data points). * Support for non-continuous data – missing points are handled gracefully without breaking the chart. * Zoom and pan through curves to inspect any time window in detail.
Screenshots
Verdict
DeviceTestApp and Fireguard are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
DeviceTestApp ships an update every 11 days, Fireguard fortnightly. The most recent releases landed on October 5, 2026 and October 20, 2026 respectively.
| Parameter | DeviceTestApp | Fireguard |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 11 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 2 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | GALAXY TELECOM | Hangzhou Dashi Wisdom Technology Co., Ltd. |
In-app purchases
DeviceTestApp
No in-app purchases
Fireguard
No in-app purchases









