Financial PlanningUpdated 2025-06-23
ProjectionLab vs cFIREsim
ProjectionLab and cFIREsim are both beloved in the FIRE (Financial Independence, Retire Early) community, but they serve different levels of planning sophistication. cFIREsim is a free, open-source historical backtesting tool that's been a FIRE community staple for years. ProjectionLab is a modern, full-featured planning platform that goes far beyond backtesting. For FIRE seekers deciding between free simplicity and paid power, this comparison reveals what you gain at each price point.
TL;DR — Quick Verdict
ProjectionLab → wins this comparison with a score of 50 vs 40. Serious FIRE planners who need tax optimization, scenario comparison, and polished planning tools. cFIREsim is better if you need: quick fire gut checks and historical backtesting without any financial commitment.
Quick Facts — ProjectionLab vs cFIREsim
Winner: ProjectionLab
ProjectionLab Rating: 4.7/5
ProjectionLab Pricing: Free - $129/yr
ProjectionLab Best For: Serious FIRE planners who need tax optimization, scenario comparison, and polished planning tools
Score: 50 vs 40
cFIREsim Rating: 4.1/5
cFIREsim Pricing: Free
cFIREsim Best For: Quick FIRE gut checks and historical backtesting without any financial commitment
Categories compared: FIRE Calculations, Simulation Depth, Tax Planning, Cost, User Experience, Community Trust. Analysis by the Velocity AI Insights editorial team. Last updated 2025-06-23.
OVERALL WINNER
📊
ProjectionLab
Modern FIRE Planning Platform
4.7
Free - $129/yr
Basic free (ad-hoc projections). Premium $129/year with full suite. Lifetime $1,199 one-time. Pro $549/year for advisors.
Best For
Serious FIRE planners who need tax optimization, scenario comparison, and polished planning tools
Strengths
Full financial planning suite beyond just FIRE calculations
10,000 Monte Carlo simulations plus historical backtesting
Tax optimization with Roth conversion ladder modeling
Compare Mode for evaluating FIRE scenarios side-by-side
ACA subsidy optimization for early retirees
Modern, polished interface with saved plans
Weaknesses
$129/yr for full functionality — cFIREsim is free
More complex than needed for simple FIRE calculations
Closed source — no community contributions
Learning curve for all features
🔥
cFIREsim
Free Open-Source FIRE Calculator
4.1
Free
Completely free and open-source. No premium tier, no upsells, no account required.
Best For
Quick FIRE gut checks and historical backtesting without any financial commitment
Strengths
100% free with no premium tier or upsells
Open-source — community can audit and contribute
Historical backtesting with Trinity Study methodology
Simple interface focused on FIRE calculations
No account required — instant access
Customizable withdrawal strategies
Weaknesses
No Monte Carlo simulations — only historical backtesting
Dated interface compared to modern planning tools
No tax optimization or Roth conversion modeling
Cannot save or compare plans
No mobile optimization
Limited to US market data
Feature-by-Feature Comparison
Scores out of 100 based on capability depth, market feedback, and implementation quality.
ProjectionLab
cFIREsim
FIRE Calculations
ProjectionLab: 9vscFIREsim: 8
Simulation Depth
ProjectionLab: 9.5vscFIREsim: 6
Tax Planning
ProjectionLab: 9vscFIREsim: 2
Cost
ProjectionLab: 6vscFIREsim: 10
User Experience
ProjectionLab: 9vscFIREsim: 5
Community Trust
ProjectionLab: 7.5vscFIREsim: 9
50
Total Score
ProjectionLab wins 10 points
40
Total Score
Ready to Try ProjectionLab?
ProjectionLab scored 50 vs 40 — serious fire planners who need tax optimization, scenario comparison, and polished planning tools.
Not Sure Yet?
See all 3 tools compared — Best Retirement Planning Tools
Side-by-side pricing, features, and our #1 pick
Detailed Analysis
Our Verdict
Based on hands-on analysis across 6 categories by the Velocity AI Insights editorial team.
ProjectionLab is the better tool for anyone planning a serious FIRE journey. Tax optimization alone — Roth conversion ladders, ACA subsidies, capital gains harvesting — can save tens of thousands over early retirement, and cFIREsim can't model these. But cFIREsim remains an excellent free starting point for quick "can I retire?" gut checks. Many FIRE seekers use cFIREsim for initial estimates, then graduate to ProjectionLab for detailed execution planning.
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