GridCarbon vs PhaseXpert
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GridCarbon
Monitor the real-time carbon intensity of the UK electricity grid. Understand how electricity generation sources change and identify times when using power is more environmentally friendly. Reduce your carbon footprint by shifting energy consumption to periods of lower grid emissions.
- Real-time carbon intensity updates
- Traffic light indicator for intensity levels
- Generation mix summary
- 24-hour carbon intensity plot
- Interactive generation mix chart
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Track the carbon intensity of the GB electricity grid on your iPhone or iPad Demand for electricity varies throughout the day, and thus, the mix of generators supplying this electricity continually changes. As a result, the carbon intensity of the electricity – the quantity of CO2 produced for 1 kWh of electricity consumed – also varies continually. Deferring your use of electricity to off-peak times, when the carbon intensity is low, can help reduce your carbon footprint. Features: - Data updated every 5 minutes. - Display of instantaneous carbon intensity (gCO2/kWh). - Traffic light indicator to highlight period of low and high carbon intensity. - Generation mix summary showing total and percentage supply by type. - Line plot showing carbon intensity over the previous 24 hours. - Interactive bar chart showing the generation mix over the previous 24 hours.
PhaseXpert
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PhaseXpert is an engineering application for calculating thermodynamic and transport properties of CO₂ and supported CO₂-rich mixtures. Designed for engineers, researchers and professionals working with carbon capture, transport and storage, PhaseXpert combines practical calculation tools with transparent scientific traceability. With PhaseXpert you can: - Calculate density, viscosity, molar mass, specific volume, compressibility factor and other supported properties. - Define custom CO₂-rich mixtures using common impurities such as N₂, O₂, Ar, CH₄, H₂, CO, H₂S and H₂O. - Explore phase behaviour and phase diagrams. - Save and reuse calculation cases. - Access built-in representative CCS compositions. - Compare multiple cases side by side. - Run property sweeps across pressure and temperature ranges. - Export calculation results for further analysis and documentation. - See when a property and operating state are supported by independent experimental validation evidence. - Explore validated reference cases directly from the Saved Cases section. PhaseXpert clearly separates calculation from validation. General Properties provides the primary engineering calculations, while the Validation layer identifies specific compositions, properties and operating ranges for which independent experimental evidence is available. The app also provides information about the IFE Model, a proprietary thermodynamic model currently under development by IFE Flow Technology and supported by experimental work, including measurements in IFE’s FALCON CO₂ facility. PhaseXpert includes English and Norwegian interfaces and is designed for practical engineering use on iPhone. Important: PhaseXpert is an engineering support tool. Users remain responsible for verifying results and determining their suitability for safety-critical, design, regulatory or commercial applications.
Screenshots
Verdict
The clearest difference is update cadence: PhaseXpert at every 10 days against GridCarbon's every 4 months. GridCarbon's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 18.0). 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.
GridCarbon ships an update every 4 months, PhaseXpert every 10 days. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.
| Parameter | GridCarbon | PhaseXpert |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (6 ratings) — better | — |
| Positive reviews | 75.7% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 4 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 10 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Alex Rogers | Luciano Patruno |
In-app purchases
GridCarbon
No in-app purchases
PhaseXpert
No in-app purchases









