ONS+ vs MainContacts
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ONS+
Access real-time data on the National Electric System's operation from your mobile device. Monitor energy load, semi-hourly CMO, and generation. Receive alerts, download products, and track upcoming events.
- Real-time operation data
- Energy load monitoring
- Semi-hourly CMO tracking
- Generation information
- News alerts
- Product downloads
- Event tracking
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Com o aplicativo ONS+ você tem acesso aos principais dados que o Operador Nacional do Sistema Elétrico monitora na palma da sua mão. Veja as informações da operação do Sistema Interligado Nacional em tempo real e muito mais, como a carga de energia, o CMO semi-horário e a geração. É cadastrado no SINtegre? Receba alertas das últimas notícias, baixe os produtos mais recentes e acompanhe os próximos eventos.
MainContacts
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MainContacts helps you keep your emergency contact network organized, protected, and ready when you need it most. In stressful situations, low battery moments, or when you do not have access to your main phone, reaching the right people quickly can make a real difference. MainContacts was built to make that easier by helping you keep your essential contacts structured, updated, and available when it matters most. With MainContacts, you can add emergency contacts, assign priority levels, and build a trusted network in a simple way. Access can also be protected with an emergency identifier and PIN for more control and privacy. One of the app’s key features is Help Mode on another device. Using your emergency identifier and PIN, you can access essential contacts even when your main phone is unavailable. That makes MainContacts especially useful when speed and practicality matter most. MainContacts also helps you stay prepared with periodic reminders to review names, phone numbers, and priorities. After all, an emergency network only works well when it stays updated. Key features: • Emergency contact management • Priority-based organization • Personalized emergency identifier • PIN-protected access • Help Mode on another device • Fast access when requesting help • Periodic review reminders • iCloud sync • Sign in with Apple MainContacts was designed to offer a simple, reliable, and focused experience centered on preparedness, speed, and ease of use. Important: MainContacts does not replace official emergency services, medical services, police, firefighters, or public safety resources. It is designed to help you quickly reach your personal support network when needed.
Screenshots
Verdict
The clearest difference is update cadence: MainContacts at every 3 weeks against ONS+'s every 3 months. ONS+'s advantage is device support (3 vs 1) and iOS requirement (11.0 vs 26.0). On price, 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.
ONS+ ships an update every 3 months, MainContacts every 3 weeks. The most recent releases landed on October 6, 2026 and October 5, 2026 respectively.
| Parameter | ONS+ | MainContacts |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 49 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | ONS - OPERADOR NACIONAL DO SISTEMA ELETRICO | Lucas Monteiro |
In-app purchases
ONS+
No in-app purchases
MainContacts
No in-app purchases









