Zervers vs Sentinel by Ladris
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zervers
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We have created an alert system that can adjust the range from a few metres to 15 miles. Users can respond to alerts or ignore them when they are busy. Zervers encourages users to use their spare time responding to a variety of alerts and create records of their responses which in return they are rewarded for. Zervers enables users to create alerts for all kinds of situations in their local area. Use the app to: - Respond to alerts in your local area. - Collect rewards. - Participate in community projects. - Alert of any situation. - Share local news. - Share to social media.
Sentinel by Ladris
Understand your risk level and stay prepared for emergencies in important locations. Get actionable information on hazards like fire, flood, and heat, with location-aware alerts and evacuation readiness scores. Developed with public safety experts.
- Risk scores for multiple locations
- Active zone alerts (evacuations, warnings)
- Location-aware push notifications
- Evacuation readiness scoring
- Hazard risk breakdown
- Dynamic advisories from authorities
- No account required
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Wildfires move fast. Sentinel helps you and your loved ones stay ahead. Free for everyone. Track every active fire in the US: View a live incident map with updates on every active wildfire in the country. Follow red flag warnings, fire weather watches, and evacuation orders as they are issued. View fire spread forecasts: Sentinel's built-in fire spread simulation forecasts hour-by-hour fire progression using live weather, wind, terrain, and fuel moisture data. Simulations update automatically as each incident evolves, so you can see whether a fire is likely to reach you or your loved ones. Watch over the people and places you care about: Save locations - your home, your kids' school, a parent's house in another state - and get notified the moment a fire or evacuation order starts nearby. Sentinel also delivers IPAWS and NWS alerts for every saved location. No cost, no account, and no subscription necessary.
Screenshots
Verdict
The clearest difference is iOS requirement: Zervers at 11.0 against Sentinel by Ladris's 16.4. 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.
Zervers ships an update every 3 weeks, Sentinel by Ladris fortnightly. The most recent releases landed on May 14, 2026 and October 10, 2026 respectively.
| Parameter | Zervers | Sentinel by Ladris |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (13 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 13 — better |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 11.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 65 MB | 74 MB |
| Age rating | 4+ | 4+ |
| Developer | EQUAL INFOTECH PRIVATE LIMITED | Ladris |
In-app purchases
Zervers
No in-app purchases
Sentinel by Ladris
No in-app purchases
Questions
Is Zervers free?
Is Sentinel by Ladris free?
Do Zervers or Sentinel by Ladris have ads?
Which is updated more often, Zervers or Sentinel by Ladris?
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