Comparison

Derax vs FMN Tester

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

Head to head
About

Derax

Features
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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.

About

FMN Tester

Features
Read full description

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

Derax4 screens
FMN Tester4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

ScorecardNo meaningful differences
Derax versus FMN Tester: the parameters behind the verdict, then further details
ParameterDeraxFMN Tester
PriceFreeFree
Update frequencyEvery 9 daysEvery 8 days — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size44 MB10 MB
Age rating4+4+
DeveloperDeeray GLobal Co.,LimitedBeijing Zizai Technology Co.,Ltd.

In-app purchases

None

Derax

No in-app purchases

None

FMN Tester

No in-app purchases

Questions

Is Derax free?
Derax is free to download, with no in-app purchases.
Is FMN Tester free?
FMN Tester is free to download, with no in-app purchases.
Do Derax or FMN Tester have ads?
Neither Derax nor FMN Tester shows ads.
Which is updated more often, Derax or FMN Tester?
Derax ships an update every 9 days, and FMN Tester every 8 days. Most recently, Derax was updated on November 5, 2026 and FMN Tester on October 31, 2026.

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