Useful before authoritative
Each tool exposes its formula or working method, cites published material, and tells you what still needs professional or contractual verification.
Longlead AI · free browser tools
Free tools for earlier, better-informed planning.
Five practical calculators and working aids for defense compliance and radiation shielding. Each runs on your device, cites what to verify, and keeps the limits visible.
No account · no submissions · no network calls with your answers
Educational checklist — not a C3PAO assessment
CMMC checklist
Review all 110 NIST SP 800-171 Rev. 2 requirements by family, mark Met, Not met, or N/A, track gaps, and print your illustrative CMMC readiness checklist.
Open free tool →02Unofficial estimate — verify before SPRS submission
SPRS calculator
Estimate a NIST SP 800-171 DoD Assessment score from 110 down to −203 using the official 5, 3, and 1-point deductions and a weighted gap list.
Open free tool →03Planning ranges — not a quote
CMMC cost calculator
Estimate an illustrative CMMC level and readiness, assessment, upkeep, and first-year planning ranges from company size, FCI or CUI, and current maturity.
Open free tool →04Do not enter CUI or personal data
POA&M builder
Build a browser-only Plan of Action and Milestones table with control IDs, weaknesses, remediation, milestones, owners, status, CSV export, and print.
Open free tool →05Physicist review required before design or construction
Radiation shielding calculator
Estimate illustrative lead, concrete, or steel thickness from isotope-specific half-value layers using HVL × log₂(initial intensity / target intensity).
Open free tool →Private by construction
Calculations and saved progress remain in your browser. Nothing is submitted to Longlead, but local storage is still not an approved place for CUI or sensitive data.
Planning, not promises
Scores are unofficial, cost figures are ranges rather than quotes, and shielding outputs require qualified physicist review before design or construction.