O3 vs Shift Calendar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O3
Control your smart home environment with this app. Create custom profiles for different activities to manage HVAC, lighting, and blinds. Optimize energy usage and personalize your space for comfort and productivity.
- Activity-based room profiles
- Energy-saving eco modes
- HVAC control
- Lighting dimming
- Blind adjustment
- Bluetooth connectivity
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Take control of your space with the Delta Controls O3 App. Connect with your O3 system via Bluetooth and create profiles to take control of HVAC, lighting, blinds and other peripherals. Dim lights for presentations, optimize energy savings with eco modes or create the perfect lighting for productivity. Coupled with your O3 Sensor Hub, your space knows what you need before you have to ask. Your Room. Your Way. Paired with your O3 system, the O3 app provides: * Configurable, activity-based profiles for each room based on what you’re doing * Eco-friendly profiles to ensure that you can save energy without sacrificing comfort * Communication with your O3 system through Bluetooth ensures your preference carry over to each room
Shift Calendar
Organize your work schedule with a customizable calendar designed for shift workers. Track absences, monitor work hours with detailed statistics, and generate exportable reports. Features a dark mode for comfortable viewing.
- Customized shift scheduling
- Complete absence management
- Advanced reporting
- Exportable reports
- Dark mode
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ShiftPro is designed for shift workers who want to easily organize their day. With an intuitive and customizable calendar, it helps you manage your work and commitments, making scheduling simple and effective. CUSTOMIZED SHIFT SCHEDULING • Create and manage your work shifts in a simple and flexible way, assigning colors, icons, and details like breaks, positions, duration, and multiple shifts. COMPLETE ABSENCE MANAGEMENT • Easily track sick days, work leave, vacation days, and rest days, all in one place, for a clear and comprehensive overview of your absences. ADVANCED REPORTING • Easily monitor your work with detailed statistics on hours worked, overtime, vacation days, sick leave, and work leave. • Generate exportable reports for simpler management and instant sharing. DARK MODE • An attractive and relaxing design to view your shifts even during nighttime. CREATED BY A REAL PERSON ShiftPro is not the product of a faceless large company; it’s made by a real person. Thank you for supporting an app that’s lovingly created and constantly evolving. Every detail, under control. Further Information Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: O3 at none against Shift Calendar's 8. O3 also leads on rating (5.0 vs 4.7) and iOS requirement (15.2 vs 17.0). Shift Calendar's advantage is update cadence (weekly vs every 12 months). On price, ratings volume, ads 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. Shift Calendar sells 8 in-app purchases, starting at $0.99 per 7 days. O3 asks for nothing beyond the download.
O3 holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively.
O3 ships an update every 12 months, Shift Calendar weekly. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.
| Parameter | O3 | Shift Calendar |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.7 (3 ratings) |
| Positive reviews | — | 87.8% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 12 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 7 MB | 165 MB |
| Age rating | 4+ | 4+ |
| Developer | Delta Intelligent Building Technologies (Canada) Inc. | Andrea Agostino Cataldo |
Customer experience
O3
Shift Calendar
Bugs and requests
O3
Not enough reviews yet to summarise bugs or requests.
Shift Calendar
Requested features
2 requests- Widget support
- Larger font size for exports
In-app purchases
O3
No in-app purchases
Shift Calendar
- Weekly$0.997 Days
- Monthly$1.991 Month
- Weekly$1.997 Days
Show 5 moreShow fewer
- Monthly$3.991 Month
- Monthly7 Days trial$3.991 Month
- Annual$12.991 Year
- Annual$19.991 Year
- Annual7 Days trial$19.991 Year









