Electrical Engineering vs IndexOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Electrical Engineering
This app provides electrical calculations and fundamental concepts for students and professionals. It covers Ohm's Law, power calculations, circuit analysis, and advanced topics like wire sizing and power factor correction.
- Electrical calculations
- Basic electrical knowledge
- Advanced electrical topics
- Ohm's Law and power calculations
- Circuit analysis theorems
- Wire sizing and voltage drop
- Resistor color codes
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Electrical engineering for technical school and college: theory, formulas and calculators explained clearly. WHY CHOOSE IT • In-depth theory for every component and circuit • Calculators for every formula • Quizzes, mind maps and flashcards for revision • AI Scanner: turn your notes into maps and solve problems TOPICS • Direct current: Ohm's law, Kirchhoff's laws • Alternating current: phasors, impedance • Components: resistors, capacitors, inductors • Circuits: series, parallel, RLC • Electric machines: motors, transformers, generators • Electronics: diodes, transistors, semiconductors STUDY TOOLS • Calculators, quizzes, mind maps, flashcards, archive IDEAL FOR Technical school students and electrical engineering majors. Start studying electrical engineering the easier way today. SUBSCRIPTIONS AND TERMS Full access is available via auto-renewable subscription: • Monthly Subscription • Annual Subscription Prices are shown in the app at purchase and may vary by region. Payment will be charged to your Apple ID at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours of the end of the current period. Subscriptions can be managed and auto-renew turned off in your Apple ID Account Settings after purchase. Privacy Policy: https://masterapps.it/privacy_policy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
IndexOS
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IndexOS is the offline-first technical suite for technicians and companies: guided diagnostics, mapped fault codes, technical diagrams and manufacturer cards, in four vertical apps inside a single app. THE FOUR VERTICALS • ElectraIQ — Industrial automation: PLC, drives, motors, photovoltaics • HVACIQ — HVAC and refrigeration: boilers, splits, heat pumps, chillers • HorecaIQ — Professional kitchens: ovens, refrigeration, washing, coffee • BASIQ — Building automation: alarms, CCTV, access control, KNX/DALI WHAT YOU GET • Step-by-step guided diagnostics: from symptom to cause, with suggested tools and spare parts • Fault codes by domain, mapped and explained • Wiring diagrams and manufacturer cards you can check in the field • Technical glossary and Learn paths • Intervention history OFFLINE-FIRST All content works without a connection: perfect for plants, boiler rooms, professional kitchens and technical spaces with no wifi. FREE AND PRO The free version includes the core domains of each vertical. IndexOS Pro unlocks the full library across all four apps with a single subscription: • Monthly: €4.90/month • Annual: €49.00/year The subscription renews automatically unless cancelled at least 24 hours before the end of the current period; you can manage or cancel it anytime in your App Store settings. Privacy Policy: https://www.indexos.it/privacy-policy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: IndexOS at none against Electrical Engineering's shown. IndexOS also leads on update cadence (every 4 weeks vs every 2 months). On price, in-app purchases, 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. Electrical Engineering sells 7 in-app purchases, starting at $3.99 per month and IndexOS sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
Electrical Engineering ships an update every 2 months, IndexOS every 4 weeks. The most recent releases landed on October 16, 2026 and October 8, 2026 respectively.
| Parameter | Electrical Engineering | IndexOS |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (12 ratings) — better | — |
| Positive reviews | 73.9% of reviews | — |
| Number of ratings | 12 — better | — |
| Update frequency | Every 2 months | Every 4 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 115 MB | 155 MB |
| Age rating | 4+ | 4+ |
| Developer | Carlo Terracciano | Alessandro Silvio Celotto |
In-app purchases
Electrical Engineering
- Monthly subscription - Electro$3.991 Month
- Monthly subscription - Electro$5.991 Month
- Annual Subscription Electronic$8.991 Year
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- Annual Subscription Electronic$24.991 Year
- Annual Subscription Electronic1 Year trial2 variants$24.991 Year
- Lifetime Subscription Electro$29.99
- Circuits & Electric Machines$99.99
IndexOS
- IndexOS - Piano Mensile$3.991 Month
- IndexOS - Piano Annuale$44.991 Year
Questions
Is Electrical Engineering free?
Is IndexOS free?
Do Electrical Engineering or IndexOS have ads?
Which is updated more often, Electrical Engineering or IndexOS?
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