thinkorswim paperMoney (Schwab)
Free with a Schwab accountThe deepest trading desktop made available to paper traders, with the weakest fill engine of the group.
Strengths
- Research and analytics breadth nothing else here matches: analyze tabs, thinkBack, full portfolio modeling
- Native path from paper to a live Schwab account with the exact same platform
- Professional-grade order types and chains
Limitations
- Paper fills are widely and repeatedly reported as unrealistic, especially on illiquid names — the classic mid-fill flattery
- The learning curve is a cliff; the education center is a library, not a path
- Desktop-first: heavy client, dated UI