Mitchell is a powerful estimating platform. Supplement Tool is the letter-writing layer that gets your Mitchell estimates approved.
Mitchell writes estimates. Supplement Tool writes the letters that get them paid.
When an adjuster cuts your Mitchell estimate, you need a professional narrative letter citing OEM procedures and I-CAR standards to fight back. Mitchell doesn't write that letter. Supplement Tool does — in 60 seconds, from your phone.
60-second letters
vs. hours writing by hand
Voice input
Describe damage hands-free
Photo AI analysis
Auto-fills description
New: Supplement Line Builder — exclusive to Supplement Tool
Enter each disputed line item and the AI formats a structured, adjuster-ready addendum with professional justification for every line. Mitchell writes estimates — it doesn't build the supplement addendum that fights for them.
Pricing
Monthly price
Mitchell pricing varies by module and shop size
Free trial
Cancel anytime
Setup / onboarding fee
What It Does
Line-item damage estimate
Mitchell is an estimating platform — we are not
AI supplement letter writing
Mitchell creates estimates, not persuasive narrative letters
Adjuster denial rebuttal letter
Restoration supplement letters
OEM language & I-CAR citations in letter
Supplement Line Builder — format & justify disputed line items
Unique to Supplement Tool — enter each disputed item, AI formats a structured addendum with justification
Shop management (scheduling, invoicing)
Mitchell RepairCenter covers shop ops
Mobile & Usability
Mobile-first design
Mitchell requires a desktop workstation
Works on iPhone & Android
Voice input — speak damage description
AI photo analysis — auto-fills description
No software install required
Output & Export
Professional narrative letter output
Copy to clipboard
Print / PDF export
Word (.docx) export
Email to adjuster directly from the app
Tools & Extras
OEM part number lookup
Labor time lookup
Live disputed amount calculator
35+ insurance companies pre-loaded
Letter history
Streaming AI output (see letter as it writes)
Use both — they solve different problems
Mitchell handles your estimating workflow. Supplement Tool handles the dispute. Most shops that add Supplement Tool to their Mitchell workflow recover an extra $500–$3,000 per supplement.
At $71/month, one approved supplement pays for the tool for months.
7-day free trial. No charge until day 8. Cancel anytime.
Already using Mitchell? Try the tool first — no signup needed.