Seven free tools built for B2B sales teams and email marketers. Check email deliverability, calculate open rates, measure ROI, build buyer personas, and more. All completely free with no account required.
Each tool is purpose-built for a specific B2B sales or email marketing job. Use them individually or together for a complete outreach performance audit.
Scan your cold email subject line and body for 600 plus spam trigger words across 10 risk categories. Get a deliverability score from 0 to 100, colour-coded highlights, and smart word replacements in under a second.
Calculate your email open rate, click-to-open rate, bounce rate, and deliverability health score. Compare results to industry benchmarks across 9 categories, plan A/B tests with statistically valid sample sizes, and model campaign ROI.
Calculate your cold email reply rate, positive reply rate, and the pipeline value generated from each campaign. Compare to industry benchmarks across 8 categories. Includes an A/B test estimator and revenue projection model.
Build professional HTML email signatures with your name, title, company, phone, social links, and a custom CTA button. Works in Gmail, Outlook, Apple Mail, and all major email clients. Copy the HTML and install in seconds.
Calculate the return on investment from your B2B sales activities across four modes: outreach campaigns, sales team headcount, pipeline analysis, and marketing campaigns. Get 12-month revenue projections and improvement scenarios.
Calculate CLV and LTV across four models: Simple, Advanced NPV, SaaS subscription, and customer segment comparison. Get your LTV to CAC ratio on a visual health gauge, CAC payback period, cohort retention chart, and improvement scenarios.
Generate detailed B2B and B2C buyer personas across 12 industry categories. Each persona includes goals, daily frustrations, buying triggers, decision-making process, preferred content types, common objections, and messaging recommendations.
The majority of cold email campaigns that underperform do so for reasons that are completely measurable and fixable without expensive tools or months of testing. Low open rates usually come from spam filter issues or weak subject lines. Low reply rates usually come from poor targeting or generic copy. These free tools give you the diagnostic data to identify which problem you actually have before spending time and budget on the wrong solution.
For example, running your email through the spam word checker before your next campaign takes less than 60 seconds. If it finds critical risk words in your subject line, fixing them could double your open rate without changing anything else. That is the kind of return you should expect from a good diagnostic tool.
Similarly, using the email open rate calculator after a campaign shows you not just your open rate but also your deliverability health score, your click-to-open rate, and how all three compare to your industry benchmark. That tells you in one view whether your problem is inbox placement, subject line performance, or email content quality.
Before scaling a sales motion, you need to know your numbers. The sales ROI calculator and the CLV calculator together give you the unit economics picture that makes scaling decisions defensible. If your LTV to CAC ratio is below 3 to 1, adding more sales headcount or outreach volume will not fix the problem. If your sales ROI is negative on a per-campaign basis, the answer is not more volume, it is fixing the conversion funnel first.
These calculators are also how you build the internal business case for sales tool investments. Rather than asking for budget based on features or competitor comparisons, you can show finance exactly what 500 more qualified leads per month would generate in pipeline and revenue based on your actual conversion rates.
The buyer persona generator addresses a different but equally important problem: most B2B sales teams sell to everyone who might buy rather than focusing on the customers who are most likely to buy, stay longest, and expand most. A clear persona makes your targeting tighter, your messaging more relevant, and your close rate higher without any increase in outreach volume.
Use the tools in this order to diagnose and fix your entire email outreach funnel from targeting to conversion.
Before sending anything, get clear on exactly who you are targeting. Use the persona generator to build a detailed profile of your ideal B2B buyer including their goals, pain points, and buying triggers. Use the pain points and goals sections to inform every cold email you write.
Before sending any cold email or campaign, paste the subject line and body into the spam word checker. Fix any critical or high risk words flagged. Aim for a deliverability score of 80 or above. This one step consistently produces the highest ROI of any pre-send activity.
After your first campaign send, put your numbers into the email open rate calculator. Check whether your open rate, CTOR, and bounce rate are above or below the benchmark for your industry. The deliverability score tells you whether to focus on inbox placement or content improvement first.
Use the reply rate calculator to separate your total reply rate from your positive reply rate and calculate the pipeline value of your campaign. If your positive reply rate is below 2 percent, the problem is usually targeting quality or copy relevance, not volume. The calculator shows you exactly how much revenue each percentage point of improvement is worth.
Once you have a few campaigns worth of data, use the sales ROI calculator to determine your return on the investment in your outreach motion. If ROI is above 200 percent, you can confidently scale volume. If it is below 100 percent, scaling will compound losses and you need to fix conversion rates first.
Use the CLV calculator to determine how much each customer is worth over their lifetime. Divide that by 3 to get your maximum healthy customer acquisition cost. If your current CAC exceeds this number, your acquisition economics are unsustainable. The LTV to CAC gauge shows immediately where you stand.
Use the email signature generator to create a professional HTML signature with your contact details and a clear CTA. A professional signature builds trust on every email you send and turns your sign-off into a passive conversion opportunity. Install it in Gmail or Outlook in under 2 minutes.
Once your email process is dialed in and your unit economics are healthy, ProspectOK finds unlimited verified B2B leads filtered to your exact ICP and sends unlimited outreach at a flat monthly price. Better prospects mean higher open rates, higher reply rates, longer customer lifespans, and better CLV from day one.
| Tool | Category | Primary Output | Account Required | Best For |
|---|---|---|---|---|
| Email Spam Word Checker | Email Deliverability | Deliverability score 0-100, flagged words, replacements | No | Before every cold email send |
| Email Open Rate Calculator | Email Analytics | Open rate, CTOR, bounce rate, industry benchmark comparison | No | After each campaign to measure performance |
| Email Reply Rate Calculator | Cold Email Performance | Reply rate, positive reply rate, pipeline value projection | No | Measuring cold outreach success and ROI |
| Email Signature Generator | Email Branding | Professional HTML email signature with CTA | No | One-time setup for all outbound emails |
| Sales ROI Calculator | Sales Analytics | ROI percentage, payback period, 12-month projection | No | Justifying sales tool investment and scaling decisions |
| Customer Lifetime Value Calculator | Revenue Analytics | CLV, LTV:CAC ratio, payback period, cohort retention | No | Unit economics analysis and CAC budgeting |
| Buyer Persona Generator | Sales Strategy | Detailed persona with goals, pains, and messaging tips | No | Building ICP profiles for targeting and copywriting |
The free tools show you what is wrong with your outreach. ProspectOK gives you unlimited verified B2B leads and unlimited cold email sending at a flat price to fix it at scale.
No credit card required. Cancel anytime. Plans from $49 per month