Derax vs FMN Tester
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Derax
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Derax is a digital wellness and self-management tool. Derax offers NFC-based app locking and unlocking services designed to help users establish a "digital detox ritual" through physical interaction, thereby improving focus and mental health. 【Important Permission: Screen Time (Family Controls)】 To implement the "NFC swipe lock/unlock" function, Derax requires access to Apple's Screen Time framework (Family Controls). Purpose: This permission allows Derax to restrict or restore access to specific apps after a successful NFC card verification, enabling the locking or unlocking experience. Privacy and Security: All data within the Block app is stored locally on your device. The Screen Time permission is used solely for local NFC verification and app restriction management; it does not read any personal usage data or upload anything to a server. How it Works: App restrictions are only applied or removed when you actively perform an NFC swipe. Derax does not monitor your screen activity, track your usage habits, or interfere with your normal phone use. Necessity: Due to iOS security restrictions, third-party apps cannot directly manage the state of other apps. Apple's Screen Time framework (Family Controls) is the only approved mechanism for this functionality. You can review or remove this permission at any time in Settings > Screen Time.
FMN Tester
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FM Factory Tool FM Factory Tool is a professional testing and management application designed for Find My Network accessory manufacturers, supporting production line testing, customer product demonstrations, and after-sales device handling. 【Core Features】 Multi-Protocol Device Scanning • Support for FMNA, FMDN, Nut, Nutale, HWTag protocols • Real-time Bluetooth device scanning with RSSI display • Quick filtering and target device localization UWB Ranging & Direction • Ultra-Wideband precision distance measurement • 3D spatial direction indicator with real-time arrow navigation • ARKit augmented reality support Device Configuration & Management • Automatic Serial Number, Token, and Extra Data writing • MFI Plan and Fast Pair device data synchronization • Production task tracking with PPID management Professional Testing Reports • Local SQLite database for test record storage • Data export and synchronization support • Complete production traceability 【Use Cases】 • Find My Network accessory production line testing • Bluetooth tracker factory testing • UWB device function validation • E-INK device function validation and demonstration • Third-party accessory compatibility testing • Customer product demonstrations and showcases • After-sales device diagnostics and handling
Screenshots
Verdict
Derax and FMN Tester 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.
Derax ships an update every 9 days, FMN Tester every 8 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | Derax | FMN Tester |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 44 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Deeray GLobal Co.,Limited | Beijing Zizai Technology Co.,Ltd. |
In-app purchases
Derax
No in-app purchases
FMN Tester
No in-app purchases









