Petmio vs Derax
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Petmio
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Petmio brings your pet’s location, activity, and health insights into one intelligent app. With high-precision GPS, advanced indoor positioning, and AI-powered insights, Petmio helps you track your pet in real time, understand their daily well-being, and stay emotionally connected through an AI pet companion—delivering safety, clarity, and peace of mind.
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.
Screenshots
Verdict
The clearest difference is update cadence: Derax at every 9 days against Petmio's monthly. On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Petmio ships an update monthly, Derax every 9 days. Both last shipped on November 9, 2026.
| Parameter | Petmio | Derax |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 147 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | 继海 宋 | Deeray GLobal Co.,Limited |
In-app purchases
Petmio
No in-app purchases
Derax
No in-app purchases









