Breadpad vs LTspice #

Comprehensive comparison between Breadpad and LTspice, two powerful SPICE circuit simulators with different approaches.

Executive Summary #

Platform & Accessibility #

Breadpad #

✅ Native apps for iPhone, iPad, Mac, Vision Pro ✅ Touch-optimized interface with Apple Pencil support ✅ Mobile-first - design circuits anywhere ✅ iCloud sync across all devices ✅ Gamepad support for accessibility ✅ Works offline after initial download

LTspice #

✅ Windows and Mac desktop applications ✅ Mature, stable platform (20+ years) ✅ Fast performance on desktop hardware ✅ Runs on Linux via Wine ❌ No mobile or tablet versions ❌ No touch interface ❌ No cloud sync (manual file management)

Winner: Breadpad for mobility, LTspice for desktop power

User Interface & Workflow #

Breadpad #

• Visual breadboard metaphor - place components like real hardware
• Immediate feedback - see connections as you build
• Simplified component selection with toolbox
• Touch gestures - pinch to zoom, drag to pan
• Intuitive for beginners and students
• Limited schematic view (breadboard focused)

Example Workflow:

1. Select resistor from toolbox
2. Tap breadboard to place
3. Tap the component to edit its value
4. Connect with wire tool
5. Add probes by tapping nodes
6. Run simulation with one button

LTspice #

• Schematic capture - traditional circuit diagrams
• Component library - extensive built-in models
• Waveform viewer - powerful analysis tools
• Text editor for netlists
• Steep learning curve but extremely powerful
• Professional appearance

Example Workflow:

1. Draw schematic using F2 component menu
2. Wire components with F3 tool
3. Add SPICE directives (.tran, .ac, etc.)
4. Run simulation
5. Add traces to waveform viewer
6. Analyze with cursors and measurements

Winner: Tie - depends on use case (Breadpad for learning/mobile, LTspice for professional work)

Component Libraries #

Breadpad #

• 9 component types: Resistor, Capacitor, Inductor, Diode, Transistor, Chip, Voltage Source, Wire, Transmission Line
• 1000+ transistor models included
• Diode library with common parts
• 74xx logic chips library
• Custom IC import (Premium) - import SPICE subcircuits
• Focus on education - not exhaustive

LTspice #

• Extensive library of Analog Devices parts
• Manufacturer models widely available
• User-contributed libraries
• Comprehensive passive and active components
• Specialized parts: op-amps, regulators, MOSFETs, IGBTs
• Free downloads from component manufacturers

Winner: LTspice - far more components out of the box

Simulation Capabilities #

Breadpad #

Free:

• ✅ DC Operating Point
• ✅ Transient Analysis
• ✅ Real-time (live) view
• ✅ SPICE Shell (raw netlist, incl. .dc sweeps)
• ✅ Up to 2 probes

Premium:

• ✅ AC Small-Signal Analysis
• ✅ Tolerance & Monte Carlo
• ✅ Temperature Sensitivity
• ✅ Unlimited probes & signals
• ✅ Data export (CSV / WAV)

Limitations:

• Simplified analysis setup
• Basic measurement tools
• Limited waveform math

LTspice #

Free (All Features):

• ✅ DC Operating Point
• ✅ Transient Analysis
• ✅ AC Analysis
• ✅ DC Sweep
• ✅ Noise Analysis
• ✅ Four parameter sweeps (.step)
• ✅ Fourier Analysis
• ✅ Monte Carlo (.step param)
• ✅ Temperature Analysis
• ✅ Unlimited measurement points
• ✅ Advanced waveform calculator
• ✅ FFT analysis
• ✅ Cursor measurements
• ✅ Plot expressions
• ✅ .MEASURE statements

Winner: LTspice - far more analysis types and measurement tools, all free

Performance & Speed #

Breadpad #

• Good performance on modern devices (iPhone 12+, M1 Mac)
• Optimized for mobile power efficiency
• Limitations on complex circuits (>50 components may slow down)
• ngspice engine - industry standard but not optimized like LTspice
• Battery efficient on iOS devices

LTspice #

• Extremely fast - proprietary solver optimizations
• Large circuits - handles 1000s of components
• Multi-threading for complex analyses
• Desktop power - can utilize full CPU/RAM
• Known for speed - faster than most commercial SPICE

Winner: LTspice - significantly faster, especially on complex circuits

Learning & Documentation #

Breadpad #

• In-app tutorials and tips
• Visual feedback helps understanding
• Component-focused documentation
• Great for beginners - breadboard metaphor familiar
• Example circuits (growing library)
• Comprehensive web docs (this site!)
• Active development - new features regularly

LTspice #

• Extensive documentation (PDF manual)
• Large online community - 20+ years of forum posts
• Many third-party video tutorials
• Books available on LTspice
• Power user tips widely shared
• Assumed knowledge of electronics and SPICE

Winner: Tie - Breadpad better for beginners, LTspice better for advanced users

File Formats & Interoperability #

Breadpad #

• Native format: .breadpad (proprietary package)
• Import: SPICE netlists (.spice, .cir, .net)
• Export: SPICE netlists, CSV data (Premium), screenshots
• iCloud integration for sync
• Share sheet for file sharing
• Compatibility: Can import many SPICE netlists, may need tweaks

LTspice #

• Native format: .asc (ASCII schematic), .raw (simulation data)
• Netlist: Can export SPICE netlist
• Plot data: Can export to text
• Industry standard: Many tools can read LTspice files
• Backward compatible: Files work across versions
• No cloud sync - manual file management

Winner: LTspice - better interoperability and industry acceptance

Cost Analysis #

Breadpad #

Free — all components, the full part library, Operating Point / Transient / Real-time / SPICE Shell analysis, and up to 2 probes. Great for students and casual learning.

Premium — AC analysis, unlimited probes and signals, tolerance & temperature analysis, advanced sources, custom models, and CSV/WAV export. Available as a recurring subscription or a one-time lifetime purchase. Current pricing is shown in the App Store. See Pricing.

LTspice #

Always Free:

• $0 forever
• All features
• All components (Analog Devices)
• Unlimited everything
• Supported by: Analog Devices (marketing tool)

Winner: LTspice - completely free with no limitations

Use Case Scenarios #

When to Choose Breadpad #

✅ You primarily use Apple devices ✅ You want to design circuits on the go (iPhone/iPad) ✅ You’re learning electronics and want visual feedback ✅ You teach electronics and want student-friendly tool ✅ You value touch interface and modern UI ✅ You want breadboard-style prototyping ✅ You need gamepad/accessibility support ✅ You work with simple to moderate circuit complexity

When to Choose LTspice #

✅ You need maximum simulation power and speed ✅ You work with complex circuits (100s of components) ✅ You require advanced analyses (noise, FFT, etc.) ✅ You need Analog Devices parts specifically ✅ You’re a professional engineer needing industry-standard tool ✅ You have extensive SPICE netlist libraries ✅ You prefer traditional schematic capture ✅ You want completely free with no limitations ✅ You’re on Windows (best platform for LTspice)

Side-by-Side Feature Matrix #

Migration Between Tools #

From LTspice to Breadpad #

What Transfers: ✅ SPICE netlists (with some editing) ✅ Component models ✅ Basic circuit topology ✅ Analysis types (DC, AC, Tran)

What Doesn’t: ❌ Schematic layout (must rebuild) ❌ Advanced analysis (noise, FFT) ❌ Plot configurations ❌ .MEASURE statements ❌ Waveform expressions

Process:

1. Export LTspice netlist (View → SPICE Netlist)
2. Clean up proprietary commands
3. Import to Breadpad
4. Rebuild visually on breadboard
5. Verify component values
6. Re-add probes
7. Run equivalent analysis

From Breadpad to LTspice #

What Transfers: ✅ SPICE netlists (full compatibility) ✅ Component values ✅ Basic models ✅ Analysis parameters

What Doesn’t: ❌ Breadboard layout (must draw schematic) ❌ Visual annotations ❌ Probe configurations

Process:

1. Export Breadpad SPICE netlist
2. Open LTspice
3. Create new schematic
4. Place components per netlist
5. Wire according to netlist
6. Add SPICE directives
7. Verify and simulate

Recommendations #

For Students #

Start with: Breadpad (if on Apple devices)

• More intuitive interface
• Visual learning matches physical labs
• Affordable premium option
• Mobile flexibility for studying

Transition to: LTspice for advanced courses

• Industry standard tool
• More analysis capabilities
• Free for complex assignments

For Hobbyists/Makers #

Choose: Breadpad

• Quick circuit testing on iPad
• Visual feedback matches physical breadboarding
• Great for idea exploration
• Affordable for occasional use

For Professional Engineers #

Choose: LTspice

• Industry standard
• Superior performance
• Advanced features
• Free forever
• Extensive component libraries

Consider Breadpad as supplement:

• Quick mobile circuit checks
• Client demonstrations
• Teaching/mentoring
• Prototyping ideas on the go

For Educators #

Use both:

• Breadpad: Introductory courses, labs, mobile assignments
• LTspice: Advanced courses, senior projects, research

Conclusion #

Breadpad and LTspice serve different needs:

Choose Breadpad if:

• You value mobility and Apple ecosystem integration
• You want intuitive, visual learning
• You design simple to moderate circuits
• You appreciate modern UI/UX
• You’re willing to pay for convenience

Choose LTspice if:

• You need maximum simulation power
• You work with complex circuits
• You require advanced analysis
• You want completely free tool
• You prefer traditional workflow

Use both if:

• You teach electronics (different tools for different levels)
• You’re a professional who also works mobile
• You want best of both worlds

Neither tool is strictly “better” - they excel in different areas and serve different user needs. Many users benefit from having both in their toolkit!

See Also #

• Pricing - Free vs Premium
• Platform Support - Breadpad across devices
• Getting Started - Begin using Breadpad
• SPICE Reference - SPICE syntax guide