PcbAutoRouter vs FreeRouting Comparison
FreeRouting vs PcbAutoRouter performance, features, and routing quality comprehensive comparison analysis
PcbAutoRouter vs FreeRouting: GPU-Accelerated PCB Auto-Routing Performance Comparison
This article provides a comprehensive comparison of two open-source PCB auto-routing tools based on actual test project (icezum2.dsn), covering performance, features, and routing quality.
Test Environment
- Test File: icezum2.dsn
- Hardware Configuration: CPU-6800U, 16GB RAM, Integrated Graphics
- Operating System: Ubuntu 24.04
- Test Date: August 2026
- Software Versions: PcbAutoRouter-1.4465, FreeRouting-2.1.0
Tool Overview
FreeRouting
- Open-source PCB auto-routing tool
- Based on traditional search algorithms
- Supports DSN/SES export/import
- Developed in Java with cross-platform support
PcbAutoRouter
- GPU-accelerated AI auto-routing tool
- Based on RL (Reinforcement Learning) algorithms
- Supports interactive routing and fine-tuning
- Developed in C++20 with native performance
Performance Comparison Test
PcbAutoRouter
- Time: 15.22s
- Unconnected Nets: 0
- Auto Trace Width: Supported
- Differential Pair Length Matching: Supported
FreeRouting
- Time: 10 min
- Unconnected Nets: 6
- Auto Trace Width: Not Supported
- Differential Pair Length Matching: Not Supported
Results Comparison
Routing Quality Comparison
Routing Completion Rate
Routing completion results for both tools on icezum2.dsn:
| Metric | FreeRouting | PcbAutoRouter |
|---|---|---|
| Completion Rate | 98% (6 unconnected nets) | 100% |
| Unconnected Nets | 6 | 0 |
| Time | 10 minutes | 15.22 seconds |
| Performance | Baseline | 39x Faster |
Performance Analysis
From the test data:
- Time Comparison: PcbAutoRouter takes 15.22 seconds while FreeRouting takes about 10 minutes (600 seconds), making PcbAutoRouter approximately 39x faster
- Completion Quality: PcbAutoRouter achieves 100% routing completion, while FreeRouting has 6 unconnected nets with only 98% completion rate
- Performance Reasons:
- PcbAutoRouter uses GPU parallel acceleration, fully utilizing graphics card computing power
- FreeRouting is Java-based using traditional sequential search algorithms with lower efficiency
- PcbAutoRouter's optimized algorithm is more efficient with RL-assisted reduced search space
Features Comparison
Core Features
| Feature | FreeRouting | PcbAutoRouter |
|---|---|---|
| Auto Routing | ✓ | ✓ |
| Interactive Routing | ✓ | ✓✓ |
| Differential Pair Length Matching | ✗ | ✓ |
| Auto Trace Width Calculation | ✗ | ✓ |
| GPU Acceleration | ✗ | ✓ |
| Multi-threading Support | ✓ | ✓ |
Workflow
FreeRouting: - Load DSN → Auto-route → Export SES - Limited functionality, lacks flexibility - Design modifications require returning to EDA tool
PcbAutoRouter: - Load DSN → Auto-route → Interactive fine-tuning → Export SES - Built-in comprehensive interactive editing tools - Support most modifications within the tool
Differential Pair Length Matching
Features Comparison
| Feature | FreeRouting | PcbAutoRouter |
|---|---|---|
| Differential Pair Detection | ✗ | ✓ (Auto-detection) |
| Length Constraint | ✗ | ✓ |
| Serpentine Routing | ✗ | ✓ |
| Length Compensation | ✗ | ✓ |
Analysis: For projects with differential pairs (such as high-speed signals, DDR memory), PcbAutoRouter provides comprehensive differential pair management features, while FreeRouting cannot handle such requirements.
Auto Trace Width Calculation
PcbAutoRouter provides auto trace width calculation based on current routing environment and rules:
- Automatically calculate minimum trace width based on current requirements
- Dynamically adjust based on routing congestion
- Consider impedance matching requirements
FreeRouting does not support this feature and requires manual trace width settings.
Usability Comparison
UI/UX
| Aspect | FreeRouting | PcbAutoRouter |
|---|---|---|
| Interface Friendliness | Fair | Excellent |
| Language Support | Limited | ✓ (10+ languages) |
| Real-time Preview | ✓ | ✓✓ |
Overall Assessment
FreeRouting
Advantages: - Completely open-source - Stable and mature functionality - Active community
Disadvantages: - Slow performance - Limited features - Lacks differential pair support - No multi-language support
PcbAutoRouter
Advantages: - Superior performance (GPU acceleration) - Complete features (differential pairs, auto trace width) - Powerful interactive editing capabilities - Multi-language support and plugin integration - Seamless integration with common EDA tools
Disadvantages: - Professional version requires payment - Free version has project size limitations
Conclusion
Based on icezum2.dsn test results:
- Performance: PcbAutoRouter is 39x faster (15.22s vs 600s), with significant GPU acceleration advantage
- Completion: PcbAutoRouter achieves 100% routing completion, FreeRouting only 98% with 6 unconnected nets
- Features: PcbAutoRouter provides advanced features like differential pair length matching and auto trace width calculation that FreeRouting cannot offer
- Usability: PcbAutoRouter provides better user experience and EDA tool integration support
Recommended Scenarios
Choose PcbAutoRouter: - Need high-performance routing (large projects) - Project includes differential pairs - Need integration with KiCad/JLCEDA - Prioritize user experience and usability
Choose FreeRouting: - Small projects with no special performance requirements - Need completely open-source solution - Simple projects with no special feature requirements