λ | Cortex Go vs Polar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
λ | Cortex Go
Access and manage your video surveillance system remotely. View live feeds, playback recordings, and receive instant alerts for motion or alarms. Supports multiple NVR models and offers advanced features like digital zoom and PTZ control.
- Live video streaming
- Video playback and recording
- Push notifications for alarms/motion
- Digital zoom and PTZ control
- Multi-site connectivity
- Instant video snapshots and sharing
- P2P connectivity for remote setup
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Compatible with λ | Cortex NVR devices - λ | Cortex NVR range (Terminator, Hibernator, Genisys & λ | Cortex Max models) Features include: - Multiple layouts - Video playback - Multi-site connectivity - Digital Zoom - PTZ Control - Hot swappable camera tiling - Instant snapshot of video and share to shareable apps - Record video footage - Push notification when alarm or motion is triggered - P2P connectivity for simple remote setup - Timeline with activity - Auto populate any site by tapping site name in portrait mode - Animated swipe left/right to load next/previous set of cameras - Forward and rewind 10 sec by tapping left/right side of full-screen - Supports Security level 1 - Re-arrange the order of devices/favourites by hold, drag and drop when device/favourites list is collapsed - Swipe left/right to load next/previous site's favorites while streaming favorites - Thumbnails as a preview in the timeline for playback video when a user scrolls over the timeline - Group favorites from different sites and auto-populate - Camera audio support - Audio challenge - Share last saved video clip to shareable apps - Backup from timeline - VA activity on timeline for λ | cortex max NVRs - File manager to list snapshots and videos - λ | Cortex TV support - Smart search
Polar
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The Polar-ESS App uses an API and connects to your Polar-ESS Cloud Monitoring account. The APP provides basic information about your Home Energy Demand, Solar PV Generation, Grid import energy and Battery Usage To view the Privacy Policy and EULA please visit the links provided in the app, or visit https://givenergy.co.uk/website-privacy-policy/ and https://polar-ess.co.uk/terms/ respectively.
Screenshots
Verdict
The clearest difference is in-app purchases: λ | Cortex Go at none against Polar's 1. λ | Cortex Go also leads on iOS requirement (9.0 vs 17.4). Polar's advantage is update cadence (every 5 weeks vs every 3 months). On price, 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. Polar sells 1 in-app purchase, starting at $25.00 per year. λ | Cortex Go asks for nothing beyond the download.
λ | Cortex Go ships an update every 3 months, Polar every 5 weeks. The most recent releases landed on September 17, 2026 and September 20, 2026 respectively.
| Parameter | λ | Cortex Go | Polar |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 37.5% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 17.4 |
| Further details — not scored | ||
| Size | 28 MB | 69 MB |
| Age rating | 4+ | 4+ |
| Developer | adata ltd | GivEnergy Software Limited |
In-app purchases
λ | Cortex Go
No in-app purchases
Polar
- Yearly Subscription1 Year trial$25.001 Year
