Free inbox tools for founders
No login. No setup. Fast calculators and diagnostics that help you close inbox gaps before they cost revenue.
Email Subject Line Analyzer
Score your subject line for opens, clarity, urgency, and spam risk.
Follow-Up Timing Calculator
Find the best next follow-up timing based on your last touchpoint.
Inbox Lead Value Calculator
Estimate monthly revenue lost from missed inbox leads.
Inbox Health Score
Get a health score for your current inbox process and response discipline.
AI Cold Email Rewriter
Rewrite cold emails to sound clearer, tighter, and more founder-friendly.
Multi-Inbox Complexity Calculator
Estimate how difficult your inbox setup is to manage reliably.
Lead Response Time Calculator
Compare revenue impact of replying in minutes vs hours.
Email Priority Matrix Tool
Turn a messy email list into clear reply priorities.
Missed Follow-Up Detector
Detect stale leads from pasted pipeline rows or CSV text.
Inbox to CRM Readiness Checker
Check if you need a CRM yet or just a stronger email workflow.
Inbox Revenue Leak Calculator
How much revenue is your inbox leaking every month?
Never Miss Lead Score
Estimate how likely your current setup is to miss qualified leads.