Solar PV System Designer vs Rool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Solar PV System Designer
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Solar PV System Designer - Full Description Solar PV System Designer is a comprehensive battery bank configuration tool that takes the guesswork out of designing safe and efficient energy storage systems for your solar PV setup. Simply input the number of batteries you have and their voltage, and the app automatically calculates all possible output voltage configurations based on your available batteries. The intelligent algorithm analyzes series and parallel combinations to show you every safe wiring option. Key Features: Automatic Voltage Calculations - Instantly see all achievable voltage configurations from your battery inventory, whether you need 12V, 24V, 48V, or custom arrangements. Visual Configuration Display - View clear, interactive diagrams showing exactly how batteries should be connected in series and parallel to achieve each voltage option. Safety-First Design - Every configuration is validated to ensure safe operation, preventing dangerous wiring mistakes before they happen. Wire Size Recommendations - Get precise wire gauge recommendations for each configuration, ensuring proper current handling and minimizing voltage drop. Total Capacity Calculations - See the complete watt-hour (Wh) capacity for your entire battery bank across all configurations. Interactive Schematic Generator - Select your desired output voltage and instantly receive a detailed wiring schematic showing exactly how to connect your batteries, complete with wire gauge specifications for each connection. Perfect for DIY solar enthusiasts, off-grid homeowners, and professionals who want to design battery banks quickly, safely, and correctly the first time.
Rool
This app provides a private cloud-based AI assistant to help you with tasks, projects, and file management. It allows you to chat with an AI, create and edit files, generate content, and collaborate with others in isolated project environments.
- Private cloud computer
- AI-powered task completion
- File upload and management
- Content generation (text, code, images)
- Persistent project memory
- Collaborative work environments
- Data export
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Rool gives you a private computer in the cloud that you can talk to. Ask questions, create files, solve problems, and work through projects with an AI that builds on what you’ve already done. Each Rool Machine brings your conversations, files, and memory together. It can run software and carry out tasks with multiple steps, helping you go from an idea to finished work through a familiar chat. WORK WITH YOUR FILES Upload documents, PDFs, images, spreadsheets, and code. Ask Rool to read, edit, organise, or create files for you. Turn notes into a report, work through calculations, or build an interactive HTML page. CREATE AND EXPLORE Draft ideas, generate images, write code, and compare different approaches. Refine the results through conversation and keep what you create alongside the rest of your project. BUILD ON YOUR WORK Rool connects your notes, conversations, files, and decisions through persistent memory. Return to a project with its context still available, and ask your AI to use earlier work when planning what comes next. MAKE ROOM FOR DIFFERENT PROJECTS Use separate Machines for personal projects, work, or shared interests. Each has its own files and memory, helping you keep different parts of your life organised. WORK TOGETHER Invite others into a Machine to collaborate with the same AI, files, and project history. Changes sync in real time, so everyone can work from the same information. PRIVATE BY DESIGN Your work is stored in your own isolated Machine, hosted in the EU. Rool has no ads and does not sell your data or share it for third-party AI training. You can export your data whenever you choose. AI INCLUDED Advanced AI is built in. Rool automatically selects models for the task, so you can focus on what you want to do. Start with a free plan that includes AI access, persistent memory, and file storage. Paid plans offer higher usage and storage limits. Terms of Use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Solar PV System Designer at none against Rool's 2. On price, update cadence, 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. Rool sells 2 in-app purchases, starting at $12.99 per month. Solar PV System Designer asks for nothing beyond the download.
Solar PV System Designer ships an update weekly, Rool every 8 days. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.
| Parameter | Solar PV System Designer | Rool |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.6 (5 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | Weekly — better | Every 8 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 222 MB | 13 MB |
| Age rating | 4+ | 17+ |
| Developer | Cepoi Mario | Lightpost One Limited |
In-app purchases
Solar PV System Designer
No in-app purchases
Rool
- Plus$12.991 Month
- Pro$29.991 Month
Questions
Is Solar PV System Designer free?
Is Rool free?
Do Solar PV System Designer or Rool have ads?
Which is updated more often, Solar PV System Designer or Rool?
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