SAR-Ready 800-53 Writeups in Hours, Not Days
CoAssessor is the AI-powered assistant for FedRAMP and RMF security control assessments — control lookup, artifact analysis, gap analysis, and audit-ready writeup generation in one place.
30-day free trial. No credit card required. Built by practitioners with CISSP, CISM, and CISA credentials.
300+
NIST 800-53 Rev 5 Controls
5 hrs
Saved Per Assessment
FedRAMP
& RMF Ready
30-Day
Free Founding Trial
Control writeups eating your evenings? A single assessment can mean hundreds of narratives written by hand.
Interpreting 800-53 Rev 5 controls across AC, IA, and SC families takes days of cross-referencing.
Evidence scattered across folders, emails, and spreadsheets when the auditor calls.
Enterprise GRC platforms cost six figures and take months to deploy. Spreadsheets cost your nights and weekends. CoAssessor is built for the assessor.
How It Works
Three steps from control to SAR-ready writeup
Look up any control
Control Navigator interprets 800-53 Rev 5 requirements in plain language.
Attach your evidence
Artifact Analysis reviews documents against control requirements and flags gaps.
Generate the writeup
SAR-ready narratives with full audit trail, reviewed and finalized by you.
One Platform. Every Tool You Need.
Control Navigator
Interpret any 800-53 Rev 5 control in plain language.
Writeup Generator
Draft SAR-ready narratives in seconds, not hours.
Artifact & Evidence Analysis
AI-reviewed evidence with sufficiency ratings and gap flags.
Gap Analysis
Identify implementation gaps across your control baseline.
Executive Summary Generator
Translate technical findings into leadership-ready reports.
Courses & Community
Expert-led courses and a community of assessors.
The Founding 50
Founding 50: 50 seats remaining
- Free founding access to the core platform
- Free enrollment in the KamilSec NIST 800-53 course ($197 value)
- Founding-member badge on your profile
- Monthly roadmap call with the founders
- Locked founding pricing when paid plans launch
If CoAssessor doesn't save you at least 5 hours on your next assessment, tell us — we'll refund anything you paid and you keep the course.
Trusted by Security Professionals
Assessors, ISSOs, and 3PAO teams writing 800-53 narratives every day
"I generated 40 AC-family writeups in under an hour. What used to be a week of evenings is now a single afternoon session."
Marcus Torres
Senior Assessor, 3PAO
"The control translations in plain English are exactly what I needed. My junior staff can now draft SAR narratives without me babysitting every word."
Alex Rivera
ISSO, Federal Agency
"Artifact analysis caught a gap in our evidence that the auditor would have flagged. Saved me a round of revisions on the spot."
Kristen Patel
Compliance Consultant
Frequently Asked Questions
Everything you need to know before starting
Is my assessment data secure?
CoAssessor runs on hardened cloud infrastructure with encryption at rest and in transit. Access is controlled per-user with role-based permissions, and every action is logged in a full audit trail. Your data is never shared with third parties or used to train models.
Does CoAssessor cover NIST 800-53 Rev 5?
Yes. CoAssessor includes the complete NIST SP 800-53 Rev 5 control catalog — every family, every control, every enhancement — with plain-language translations, testing procedures, and FedRAMP mapping.
Can AI-generated writeups be trusted in a real audit?
CoAssessor drafts the narrative — the assessor reviews and owns the final writeup. Every edit is tracked in a full audit trail. The AI accelerates the first draft; human judgment ensures the final quality. This is an assistive workflow, not a black box.
Who is CoAssessor for?
ISSOs, security control assessors, 3PAO teams, GRC consultants, and anyone working on FedRAMP, RMF, or FISMA packages. If you write 800-53 narratives or review control evidence, CoAssessor is built for you.
What does it cost?
Founding members get a 30-day free trial with no credit card required. After the trial, the Professional plan is $19.99/month. Cancel anytime, self-service. Your work is never deleted.
Is this a replacement for eMASS or Xacta?
CoAssessor complements — not replaces — your existing GRC stack. If you already have eMASS or Xacta for authorization tracking, CoAssessor fills the gaps those tools don't: AI-drafted writeups, artifact analysis, and control interpretation in plain language.
Stop writing writeups by hand.
Join the Founding 50 — 30 days free, no credit card, full platform access including the NIST 800-53 course by Kamil Zakari.
30-day free trial. No credit card required. Cancel anytime.