DoD Systems Engineering vs Electrician Handbook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DoD Systems Engineering
This app serves as a pocket reference for the Department of Defense Systems Engineering Technical Review process. It offers definitions for nearly 250 acronyms, details on Technology Readiness Levels, and in-depth information on review phases and technical processes.
- Acronym lookup (250+ definitions)
- Technology Readiness Level definitions
- Review information by phase
- Phase details (Materiel Solutions Analysis to Operations & Support)
- Technical and technical management processes
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This app provides a handy pocket reference for engineers and logisticians involved in the very complex Department of Defense Systems Engineering Technical Review process. Features include: *Acronym lookup - nearly 250 acronyms defined! *Technology Readiness Level definitions *In-depth review information sorted by phases *In-depth phase information, from Materiel Solutions Analysis through Operations and Support *Comprehensive Information on technical and technical management processes All ThinChip Software apps are now available free of charge.
Electrician Handbook
This app provides electricians, students, and installers with essential electrical theory, interactive diagrams, and practical calculators. It includes a community forum for users to share knowledge and seek advice, all accessible offline without ads or subscriptions.
- Electrical theory topics
- Interactive circuit diagrams
- Calculators and formulas
- Community forum
- Offline access
- No ads or subscriptions
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Electrician’s Handbook — an app for electricians, students, and installers. Theory, diagrams, and calculators in one place. Works offline. No ads. No subscriptions. — Theory A variety of topics in electrical engineering: from basic concepts to grounding and lighting diagrams. Some topics include exercises with answers for self-check. — Diagrams Interactive electrical diagrams. You can interact with elements to better understand how they work. — Calculators A section with calculators, formulas, and useful reference tables. — Community A section where users can ask questions, share experience, and get advice from other members. — Contents of the "Theory" section: Basic concepts • Voltage, current, resistance, power • Ohm’s Law, Kirchhoff’s rules • Parallel and series connections • Short circuits, safety precautions • Electrical engineering terms Electromechanical converters • Transformer, generator, electric motor • Connecting a three-phase motor using a capacitor Protection and automation devices • Circuit breaker, RCD, RCBO • Voltage monitoring relay, contactor, fuses • Surge protection devices Cables and wires • Wire connection methods • Selecting cross-section by current and power • Color coding • Electrical panel Power stations and substations • Nuclear, thermal, solar, hydro, wind, and geothermal power stations Measuring instruments • Voltmeter, ammeter, ohmmeter, multimeter • Clamp meter • Electricity meter Grounding • Types of grounding systems • Equipotential bonding system Lighting • Incandescent, LED, and other types of lamps • Lamp holders, bases, lumens, lux • Color temperature • LED strip Work execution • Socket repair • Installation of flush-mounted and surface-mounted sockets • Switch installation Additional information • Power supply categories • Surge overvoltages • IP protection rating • Electrician’s tools • Types of outlets and plugs, voltages in different countries • Joule’s Law, Coulomb’s Law • Right-hand and left-hand rules — Contents of the "Diagrams" section: • Switch (1 and 2 gang) • Three-gang switch • Two-way switch • Two-way switch with intermediate switch • Outlets and switch in one block • Lighting with dimmer • Motion sensor lighting • Relay with light sensor • Lighting with impulse relay • Fluorescent lamp wiring • Socket wiring diagrams • Magnetic starter for motor • Star and delta motor connection — Contents of the "Calculators" section: • Basic formula calculator • Electricity cost calculator • SI unit system and metric prefixes • Diameter ↔ cross-section table • AWG to mm and mm to AWG conversion • Electronic component symbols
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Verdict
The clearest difference is rating: Electrician Handbook at 4.8 against DoD Systems Engineering's 3.8. Electrician Handbook also leads on update cadence (every 2 weeks vs every 5 months) and review sentiment (79% vs 50%). DoD Systems Engineering's advantage is in-app purchases (none vs 2). On price, ads, monetization model 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. Electrician Handbook sells 2 one-off in-app purchases. DoD Systems Engineering asks for nothing beyond the download.
Electrician Handbook holds the better App Store score, 4.8 against 3.8. That said, the two scores are not equally well evidenced: Electrician Handbook has 1K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 50% of DoD Systems Engineering's written reviews are positive against 79% of Electrician Handbook's.
DoD Systems Engineering ships an update every 5 months, Electrician Handbook every 2 weeks. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.
| Parameter | DoD Systems Engineering | Electrician Handbook |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (4 ratings) | 4.8 (1K ratings) — better |
| Positive reviews | 50.0% of reviews | 78.6% of reviews — better |
| Number of ratings | 4 | 1K — better |
| Update frequency | Every 5 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 26.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | Russell Shannon | Sergey Vavaev |
Customer experience
DoD Systems Engineering
Electrician Handbook
Bugs and requests
DoD Systems Engineering
Not enough reviews yet to summarise bugs or requests.
Electrician Handbook
Reported bugs
3 issues- App not launching on certain devices
- Calculation errors in some modules
- Inconsistent UI behavior across platforms
Requested features
4 requests- More practical examples and tutorials
- Ability to save and export diagrams
- Inclusion of industry standards and regulations
- Integration of testing and simulation tools
In-app purchases
DoD Systems Engineering
No in-app purchases
Electrician Handbook
- Remove ads from application$2.99
- Unlock all features in app$6.99




