GridMix vs Chartes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GridMix
This app visualizes your region's live CO₂ emissions and forecasts them for the next 24 hours. It helps you identify the cleanest times to use electricity, like charging an EV or running appliances, to reduce your carbon footprint.
- Live CO₂ emissions visualization
- 24-hour emissions forecast
- Marginal Operating Emissions Rate (MOER)
- Fossil fuel percentage on grid
- Location-aware coverage
- Near real-time updates
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Electricity isn’t equally clean every hour. This app shows your region’s live CO₂ and a 24-hour forecast so you can act when energy is cleanest. About to charge your EV or start the dryer? If the curve drops in an hour, wait and cut your emissions—no guesswork. Simple timeline, clear numbers, smarter choices. Know when your electricity is cleanest. Open the app and the gradient color tells the story in a glance: lighter green means cleaner power right now; darker tones mean it’s dirtier. No menus. No jargon. Just a quick read on your impact. For more detail, see the exact numbers: • MOER — the Marginal Operating Emissions Rate: the extra CO₂ emitted if one more megawatt-hour is used right now. Shown in lbs CO₂/MWh, it’s the most actionable way to time charging and appliances. • Fossil % — the share of your grid currently powered by fossil fuels. Plan smarter with a 24-hour forecast for your region. If emissions drop in an hour or two, you’ll see it, so you can delay EV charging, laundry, or heating/cooling to a cleaner window. Built on trusted public data. The app combines reliable datasets (U.S. EIA grid operations and EPA emissions) with robust statistical modeling. Data are refreshed throughout the day, so shifts in demand are captured in near real-time. Location-aware, nationwide coverage. We use your current location to map you to your Balancing Authority (BA) so you’re seeing the electricity you actually consume. The majority of major U.S. BAs are supported. Why you’ll love it • At-a-glance color gradient for “clean vs. dirty” right now • Current MOER (lbs CO₂/MWh) and Fossil % on your grid • 24-hour emissions forecast to pick the greenest hour • Near real-time updates as conditions change • Clean, minimal design—open, check, decide What’s next: widgets, notifications when low-emission hours are coming, a watchOS app, and more. Make timing your climate superpower. See when your energy is cleanest and act on it.
Chartes
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Chartes delivers professional PDF scanning with complete privacy with zero complexity. 100% Offline. No subscription. No watermark. Multi-Language Support English, Chinese, and Spanish. SCAN TO PDF INSTANTLY Turn any document into a crisp PDF in seconds. Receipts, contracts, notes, letters - capture with your camera and export as a professional PDF ready to share. Multi-page support lets you scan entire documents in one session. PRECISION CROPPING Frame your scans perfectly with preset aspect ratios: Letter, Legal, A4, Half Letter, or freeform. Every PDF looks clean and properly formatted. ENHANCE YOUR SCANS Apply filters to optimize readability. Keep original color for photos and graphics. Use grayscale for general documents. Choose black and white for maximum clarity on text-heavy pages. Rotate pages to perfect orientation. SHARE ANYWHERE Export your PDFs instantly to email, messaging apps, cloud storage, or any app on your device. Choose standard quality for smaller files or high quality for archival-grade output. SUPPORT 4 LANGUAGES English, Traditional Chinese, Simplified Chinese, and Spanish PRIVACY BY DESIGN Your PDFs never leave your device. No cloud uploads. No account required. No tracking or analytics. Scan sensitive documents with confidence - everything stays local. PAY ONCE, OWN FOREVER No subscriptions. No in-app purchases. No ads. Just a thoughtfully crafted PDF scanner that respects your time and privacy. ORGANIZE YOUR SCANS - Automatic file naming or custom names - Visual library shows all PDFs at a glance - Rename documents anytime - Bulk select and delete - View page count, file size, and creation date FEATURES - Instant PDF creation - Multi-page scanning - Precision cropping with presets - Color, grayscale, and B&W filters - Page rotation - Flash control for low light - Local-only storage - No subscription From the Greek chartes, meaning "paper" Pay once, own forever. Built with Love by AiofEffect LLC Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aiofeffect.com/privacy Terms & Conditions: https://aiofeffect.com/terms
Screenshots
Verdict
The clearest difference is in-app purchases: GridMix at none against Chartes's 1. GridMix also leads on update cadence (every 3 days vs every 6 weeks). On price, ads, device support and iOS requirement 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. Chartes sells 1 one-off in-app purchase. GridMix asks for nothing beyond the download.
GridMix ships an update every 3 days, Chartes every 6 weeks. The most recent releases landed on September 19, 2026 and September 15, 2026 respectively.
| Parameter | GridMix | Chartes |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 days — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.2 | 15.1 — better |
| Further details — not scored | ||
| Size | 97 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | John Chaykowsky | Aiofeffect LLC |
In-app purchases
GridMix
No in-app purchases
Chartes
- Chartes Lifetime$1.99









