OMOsystems vs HP15C
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OMOsystems
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It’s time to stop worrying about possible dangers that surround us. Everyday news channels show accidents, criminal cases, and other scary things that keep us in tension. Doesn’t this hinder your productivity and lower your quality of life? With OMO, you’ll be fully sure that your home and loved ones who live there are safe. So, how does it work? 1. OMO Basic service package includes 7 elements that are enough to ensure the basic security at any home: - Doorbell - Indoor camera - Motion sensor - Three opening sensors - Wireless Network Extender 2. You do nothing to install devices but the provider's service people do everything for you. The same is for the OMO system maintenance. Should you need any, just let professionals take care of it. 3. Together with Package 1, you get the OMO app. Be always aware of what's going on at home and be sure that it is safe. Anytime, anywhere. Also, feel free to share access to it with up to 6 family members or roommates. Let your smart home handle security tasks for you. Take care about what really matters.
HP15C
Relive the classic computing experience with a vintage scientific calculator. This app emulates a beloved 90s model, offering a nostalgic and functional tool for calculations.
- Vintage scientific calculator emulation
- Classic 90s design
- Functional for scientific calculations
- Nostalgic user experience
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Vintage classic scientific calculator. The 90s are back baby! A really special person asked me to build this calculator as it was his favorite calculator, here it goes my dear. privacy policy: https://fermave.com Terms of service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula
Screenshots
Verdict
The clearest difference is price: OMOsystems at Free against HP15C's $4.99. OMOsystems also leads on update cadence (every 9 days vs every 6 months) and iOS requirement (11.0 vs 15.6). On 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
OMOsystems is free to download; HP15C costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
OMOsystems ships an update every 9 days, HP15C every 6 months. The most recent releases landed on December 1, 2025 and October 13, 2026 respectively.
| Parameter | OMOsystems | HP15C |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | — | 2.7 (3 ratings) — better |
| Positive reviews | — | 33.3% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 9 days — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 112 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | 0M0 SYSTEMS LTD | FERMAVE |
In-app purchases
OMOsystems
No in-app purchases
HP15C
No in-app purchases
