O2Lock vs AquaMetr
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O2Lock
Read full descriptionHide full description
Opens NFC powered locks from One2Lock. Can operate on Furniture locks, Padlocks and Multi Purpose locks. Allows you to easy share keys between devices.
AquaMetr
Read full descriptionHide full description
AquaMetr app is a free app designed to work with the water TDS card from Silicon Craft Technology PLC (SIC). This app provides functions to measure TDS value from drinking water, record date, time and location of each measurement, display the measurement history.
Screenshots
Verdict
The clearest difference is iOS requirement: O2Lock at 12.0 against AquaMetr's 17.6. On price, update cadence, ads and in-app purchases 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.
O2Lock ships an update every 3 weeks, AquaMetr monthly. The most recent releases landed on September 16, 2026 and September 19, 2026 respectively.
| Parameter | O2Lock | AquaMetr |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 30 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | One2Touch AS | SILICON CRAFT TECHNOLOGY PUBLIC COMPANY LIMITED |
In-app purchases
O2Lock
No in-app purchases
AquaMetr
No in-app purchases
