Title: Free Tools — Missed-Call Calculator & More | Keres AI
URL: https://www.keresai.com/tools
Updated: 2026-10-12
Description: Free tools for businesses that live on the phone: check your email deliverability (SPF, DKIM, DMARC) and calculate the revenue you lose to missed calls.
Source: https://www.keresai.com/tools (HTML). This is a Markdown copy of the page's main content for AI agents and LLM tools.

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# Free tools

Free calculators and checkers from Keres AI, with no signup: estimate the revenue you lose to missed calls by trade, what slow lead response costs, what a front-desk hire costs against an AI receptionist, and whether your email will reach the inbox. Each tool shows its formula and assumptions.

## Free tools

Email deliverability

### [Email Deliverability Checker](https://www.keresai.com/tools/deliverability-checker)

Check your domain’s SPF, DKIM, DMARC, and MX records in seconds and see what’s keeping your email out of the inbox.

Email deliverability

### [Email Spam-Score Checker](https://www.keresai.com/tools/spam-score-checker)

Paste a subject and body to score spam-filter risk and get specific fixes — runs entirely in your browser.

Revenue

### [Missed-Call Revenue Calculator](https://www.keresai.com/tools/missed-call-calculator)

Enter your call volume and average job value to see how much revenue you lose to unanswered calls every month and year.

Cost

### [Front-Desk Staffing Cost Estimator](https://www.keresai.com/tools/staffing-savings-estimator)

See the fully-loaded annual cost of phone coverage and how many hours of the week your team still can’t answer.

HVAC

### [HVAC Missed-Call Calculator | Keres AI](https://www.keresai.com/tools/hvac-missed-call-calculator)

Peak-season and after-hours calls are where HVAC companies lose the most. Plug in your numbers to see the monthly and annual revenue slipping away to voicemail.

Roofing

### [Roofing Storm-Lead Calculator | Keres AI](https://www.keresai.com/tools/roofing-storm-lead-calculator)

A hailstorm can generate a season of calls in hours — and the first roofer to answer usually wins the claim. See what an unanswered surge costs you.

Dental

### [Dental No-Show Calculator | Keres AI](https://www.keresai.com/tools/dental-no-show-calculator)

Empty chairs are lost production you rarely recover same-day. See what your no-show rate costs every month — and every year.

Legal

### [Legal Intake ROI Calculator](https://www.keresai.com/tools/legal-intake-roi-calculator)

A single missed new-client call can be thousands in lost case value handed to the firm that answered. See what your intake gap costs.

All industries

### [Lead Response Time Calculator | Keres AI](https://www.keresai.com/tools/lead-response-time-calculator)

Speed to lead decides the job. See the estimated revenue you can recover by responding to every inbound lead in under five minutes.

Last updated October 12, 2026 · [Reviewed by the Keres AI team](https://www.keresai.com/editorial-policy)