It works where you work
No signal? The app runs. Cold hands? The interface stays usable. Thick gloves? Tap targets are large. Sentinel is built for the field, not for a meeting room.
Projects
Tasks
Cellular coverage is a luxury — not a requirement
You report a task in a no-signal zone. The app saves everything locally: photos, GPS, notes. The moment you're back in coverage, everything syncs automatically. You don't lose anything, you don't redo anything.
- Create tasks, structures and inspection reports offline — with photos and media
- Local storage on the phone, even without a connection for days
- Automatic sync the moment the signal returns, no manual action
Every hour in the field, documented
Your team logs time spent on each task directly in the app. At the office, you see the time invested by project, by person, by task type. Perfect for reports to funders and for planning future seasons.
- Time linked to the task, the project, the person — automatically
- Time reports ready for funders and seasonal planning
Data flows up, work keeps moving
The technician works, documents, closes tasks. Meanwhile, the data flows back to the office as soon as network is available. The manager sees the day's progress without interrupting anyone. You don't pay for hours of data entry after the fact — it's already in the system.
- No double entry — what's done in the field arrives at the office as is
- Progress visible in real time, without a call or status email
- Background sync, without interrupting the work in progress
Every hour linked, every total ready
Each time entry is automatically linked to a task, a task type, a trail, a volunteer. How many hours clearing fallen trees this year? How much time on the Panorama Trail? How much on that trail specifically for marking? Sentinel rolls it all up for you — no spreadsheet to compile, no volunteer to chase.
- Reports by trail, by task type, by volunteer — in just a few clicks
- Automatic seasonal rollups: hours by category, by crew, by zone
- Activity proof ready for grants, annual reports, and volunteer hour valuation
- Panorama Trail210 h
- Blue Loop85 h
- North Sector64 h
Built for people who work outside
Offline creation
Creating tasks, structures and inspection reports — with photos and media — works without a signal. Sync happens the moment the connection returns.
Interface built for the field
Large buttons, generous tap targets, sun-readable screens. Designed to be used with gloves, in the rain, on the move.
Simple time tracking
One button to start, one button to stop. Time is linked to the task, not to a timesheet to fill out Friday night.
Available on iOS and Android
The same app, the same features on both platforms. Install it on your team's phones today — no subscription needed to try it. Works on modern smartphones, even in deep-forest conditions.
iOS 14+ · Android 10+ · Free to download
Frequently asked questions
How accurate is the GPS tracking?
Modern smartphones provide GPS accuracy within 3-5 meters under open sky conditions. In dense forest, accuracy may decrease to 10-15 meters, but that's still precise enough to locate any trail feature. Sentinel also lets you fine-tune the pin location manually if needed.
Does GPS tracking drain my phone battery?
Sentinel uses smart GPS management. Location is only captured when you create or view a task, not continuously. This means minimal battery impact — you can work a full day in the field without worrying about your phone dying.
Can I use GPS tracking without internet?
Absolutely. GPS works independently of cell service. You can create GPS-tagged tasks anywhere, and they'll sync to your team when you're back in coverage. Pre-load your trail maps before heading out for the best experience.
How long can the app stay offline?
Days, even weeks. As long as you don't reinstall the app, the data stays on your phone and syncs on the next connection.
Does the app drain the battery?
No. The app is optimized to use GPS only when needed — when creating a task or viewing a specific point, never continuously in the background. Battery consumption stays very low, even during a full day in the field.
Does it work on Android and iPhone?
Yes, both. Same features, same performance. Download from the App Store and the Google Play Store.
A field tool, not a repurposed office tool
Sentinel is built by people who've already spent a full day in the forest with a phone. Try it.