Satvis vs WANJIN ESS
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Satvis
Visualize and track thousands of satellites in real-time on a 3D globe. See upcoming passes over your location and identify satellites in the sky view. This free, open-source app provides detailed spacecraft information and works offline.
- Real-time 3D satellite visualization
- Upcoming pass predictions
- Ground-level sky view
- Detailed spacecraft information
- Offline functionality
- Customizable map views
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Satvis is a free, open-source satellite tracker for iPhone and iPad. It draws more than 16,000 satellites on a 3D globe in real time: Starlink, GPS, weather satellites, the ISS and many more. Set your location and it predicts when each one passes overhead. The sky view shows the sky from where you stand. Point your phone up to see the satellites in that direction. WHAT IT DOES β’ Visualize satellites on a 3D globe in real time, propagated on the device with SGP4 from CelesTrak's element sets β’ Show points, labels, orbits, orbit tracks, ground tracks, sensor cones, 3D models and ground station links per satellite, colored by orbit class (LEO, MEO, GEO, HEO) β’ Switch catalog groups on and off (Starlink, GNSS, weather, Earth observation, crewed stations), or search for a single satellite β’ Select a satellite to see its orbit, its next passes over your locations and its spacecraft details: country, operator, manufacturer, bus, mass and size β’ Track a satellite: the camera flies to it and follows it along its orbit β’ Save your location or any point you pick on the map, then list the upcoming passes over it and get a notification before one starts β’ Find satellites overhead in the ground-level sky view, aimed by dragging or by pointing your phone, with the camera's picture of the sky behind them β’ See which satellites you could spot: the sky view dims those in Earth's shadow, too far away or in a daylit sky β’ View the globe in 3D or flattened to 2D, over the base map, star field and terrain you choose: satellite imagery, Earth at night or the day's VIIRS imagery β’ Start from the featured views, bookmark your own, and share any view as a link: it opens the same view on satvis.space β’ Open satvis.space links straight in the app β’ Keep using it offline, from the satellite data it last fetched WHERE THE DATA COMES FROM Element sets come from CelesTrak, refreshed several times a day, and are propagated on your device with SGP4. Spacecraft details come from Jonathan McDowell's GCAT. FREE AND OPEN SOURCE No account, no ads, no in-app purchases. Developed in the open at github.com/Flowm/satvis under the MIT license.
WANJIN ESS
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The EMS App supports the access and unified control of energy storage, photovoltaic and charging equipment. Support different operators' access, and completely isolate the data of each operator. Flexible generation of daily, monthly, and annual operating data reports and revenue data. For end users of energy storage, it provides power generation and power consumption data viewing, optimizes energy supply, and monitors energy equipment anytime and anywhere through instant reminders and remote access functions.
Screenshots
Verdict
The clearest difference is update cadence: Satvis at every 3 weeks against WANJIN ESS's every 6 months. WANJIN ESS's advantage is iOS requirement (12.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Satvis ships an update every 3 weeks, WANJIN ESS every 6 months. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.
| Parameter | Satvis | WANJIN ESS |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | β |
| Update frequency | Every 3 weeks β better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | β |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 12.0 β better |
| Further details β not scored | ||
| Size | 12 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Florian Mauracher | Anhui Udan Technology Co., Ltd. |
In-app purchases
Satvis
No in-app purchases
WANJIN ESS
No in-app purchases









