A/A Test Calculator (Randomization Check)
Run an A/A test to check your randomization: paste visitors and conversions of two identical groups and see if split and conversion hold. Free and live.
Open tool →Free calculators, generators and checkers that run right in your browser. No signup, no install, with the math explained.
Run an A/A test to check your randomization: paste visitors and conversions of two identical groups and see if split and conversion hold. Free and live.
Open tool →How many days your A/B test needs to run and when it ends, from your rate, target effect, traffic and number of variations.
Open tool →Write your A/B test hypothesis in the If, Then, Because, Measured by format and get a quality score. Free, live, no signup.
Open tool →Watch your A/B test's false positive rate balloon each time you peek at the result and stop early. Live simulator, free, with the stats explained.
Open tool →How many visitors per variation and how many days your A/B test needs. Free, live, with the math behind it explained.
Open tool →Paste visitors and conversions for A and B and see if the result is real: p-value, lift, confidence interval and a plain verdict.
Open tool →Find out how many A/B tests per month and per year your traffic can run, from your rate, target effect and number of variations. Free, live, explained.
Open tool →Compare several variations against the control at once, with Bonferroni and Šidák correction. See the adjusted p-value and the real winner, no false positive.
Open tool →Find the probability that B beats A and the expected loss of your A/B test, with no p-value. Free, live, with the Bayesian math explained.
Open tool →Run a chi-square test on a 2x2 contingency table: χ², degrees of freedom, p-value, Yates' correction and Cramér's V. Free, live and fully explained.
Open tool →Confidence interval for a conversion rate or for the difference between A and B. Free, live, with Wilson, Wald and the formula explained.
Open tool →See what your A/B testing program is worth: first-year ROI, incremental revenue and net gain. Free, live, with the math explained.
Open tool →Find the smallest effect your traffic can detect in an A/B test. Enter your rate, visitors and duration and see the relative and absolute MDE.
Open tool →Calculate the p-value of your A/B test (two-proportion z-test), one or two-sided, and see if it rejects the null at 90%, 95% and 99% confidence.
Open tool →Prioritize your A/B tests with PIE or ICE: score each idea, get the ranking automatically and export it to CSV. Free, live, no signup.
Open tool →Find out if your A/B test's traffic split is broken (SRM). Paste the visitors per variation and see the chi-square, the p-value and a plain verdict.
Open tool →Find the statistical power of the A/B test you ran: the chance of detecting the effect with the sample you had. Free, live, with the formula explained.
Open tool →How many subscribers per subject line your email A/B test needs, and whether your list can handle it. Free, live, with the open-rate math explained.
Open tool →Project your email list month by month with unsubscribes and other losses, see the ceiling where growth stops and how many signups per month hit your goal.
Open tool →Calculate email marketing ROI on revenue, on profit and on what email really adds. With the minimum click rate to break even. Free, no signup.
Open tool →Build your team email signature and copy table based HTML that Outlook renders like Gmail. With a score, block weight and utm tagging. Free, no signup.
Open tool →Paste your email body and see every spam trigger word marked in place, the full list by category, and the links and signals that weigh with it. Free.
Open tool →Type your subject line and get a score, the words that weigh on spam filters, and the inbox line six email clients show, with each one's cut. Free.
Open tool →See what cart abandonment costs you per month and per year, and how much is realistically recoverable. Free, with the formula and a worked example.
Open tool →Score your checkout friction from 0 to 100, get a fix queue ranked by impact and see what that friction costs per year. Free, with the model open.
Open tool →See your funnel drop-off step by step, the end to end rate and which leak to fix first. Free, live, with the formula and a worked example.
Open tool →Calculate your conversion rate and compare it to the sector median. Free, live, with the formula and a worked example that reproduces the result.
Open tool →See what half a point more in conversion rate turns into in revenue per month and per year, from your traffic and order value. Free, live, explained.
Open tool →Compute your CSAT with a Wilson margin of error, the average score, an industry benchmark and the path to your goal. Compare two periods. Free, no signup.
Open tool →See how many leads each extra form field costs you, and whether the short form still wins once lead quality drops. Free, with the model fully open.
Open tool →Grade your landing page from 0 to 100 in 2 minutes, get a fix queue ranked by impact and see what the gap costs per year. Free, model fully open.
Open tool →See whether your traffic can run an A/B test at all: the smallest lift detectable in your window, an honest verdict and the plan B when it cannot. Free.
Open tool →Compare mobile and desktop conversion, see how your gap ranks against the market and what it costs per year. Free, with the model fully open.
Open tool →Compute your NPS with margin of error, industry benchmark and the path to your goal. Compare two periods and see whether the change is real or noise.
Open tool →See what each second of load time costs you in conversion and revenue, with the elasticity you choose and the A/B test that would actually prove it. Free.
Open tool →Calculate revenue per visitor and compare two versions: catch the tests where conversion rises and money falls. Free, with a worked example.
Open tool →Find how many responses your survey needs for the margin of error you want, with finite population correction and response rate. Free, formula fully open.
Open tool →Build your robots.txt by choosing what each AI bot may do: train, cite you or fetch on request. 25 agents, conflict alerts and a file ready to download.
Open tool →Paste a passage and see whether AI can cite it: a 0 to 100 score, the snippet a model would lift and your fix queue. Free, and it runs in your browser.
Open tool →Fill in your post fields and get the Article or BlogPosting JSON-LD ready to paste, with a 0 to 100 score and a fix queue. Free, in your browser.
Open tool →Paste your questions and answers and get the FAQPage JSON-LD ready to use, with a 0 to 100 score and a fix queue. Free, and it runs in your browser.
Open tool →Answer 16 items and see whether your site is ready to be cited by AI: a 0 to 100 score, a sub-score per layer and your fix queue. Free, with the model open.
Open tool →Build your site llms.txt in the right format, get a 0 to 100 score with a fix queue and download the file. Free, and it runs entirely in your browser.
Open tool →Enter your sales or revenue goal and get the ad budget it requires, the daily budget, the clicks needed and whether the plan fits your margin. Free.
Open tool →Calculate your campaign CPA and CPL, plus the maximum CPA your LTV allows you to pay. With CAC, LTV:CAC ratio and the full lead funnel. Free, no signup.
Open tool →Calculate campaign CPC, CPM and CTR, and convert between the three: any two give you the third. With CPA, ROAS and break-even CPC. Free, no signup.
Open tool →Count every headline and description in your ad, check the limit for each Google, Meta, LinkedIn and TikTok format and see which assets are missing.
Open tool →Find what a click is worth and the max CPC that still leaves the profit you asked for, with the equivalent tCPA and tROAS for smart bidding.
Open tool →Calculate campaign ROAS and the minimum ROAS your margin needs to break even. With POAS, ACOS, maximum CPA and profit after ad spend. Free, no signup.
Open tool →Build your UTM link, see which GA4 channel group it will land in and keep your taxonomy in the browser. Free, no signup, nothing leaves your device.
Open tool →List your language versions and take the finished cluster: head tags, HTTP headers or an XML sitemap, with x-default and a score. Free, no signup.
Open tool →Count your post and see where it fits across Instagram, X, LinkedIn, TikTok and 5 more networks, with the exact point where the "see more" cut lands.
Open tool →Paste your text, declare the target keywords and see occurrences, density, text share and placement for each one. Free, no signup, all in your browser.
Open tool →Fill in the fields and take the finished block: title, description, canonical, robots, Open Graph and Twitter Card, with a score. Free, no signup.
Open tool →See the card WhatsApp, LinkedIn, X, Facebook, Telegram and Slack build from your link, with text truncation and image cropping measured. Free, no signup.
Open tool →Enter a word count or paste your text and get the reading time by reader profile, plus read aloud, video and stage pace. Free, no signup, in your browser.
Open tool →Build your robots.txt from a platform preset and test any URL against the rules before you publish. Free, no signup, everything runs in your browser.
Open tool →Paste your title and description and see the result the way Google shows it, with the cut measured in pixels on desktop and mobile. Free, no signup.
Open tool →Paste your titles and get every clean URL, with a batch score, warnings and CSV export. Strips accents, drops stop words, numbers duplicates. Free.
Open tool →Count words, characters, sentences and paragraphs, with reading time and term density. Free, no signup, and your text never leaves the browser.
Open tool →Calculate your fully loaded CAC: paid media, marketing and sales teams, tools. With blended vs paid CAC, organic share and target CAC. Free, no signup.
Open tool →Calculate how many months of gross margin it takes to recover CAC, with churn and expansion, and how much cash sits locked meanwhile. Free.
Open tool →Calculate customer churn, gross and net revenue churn, NRR and how much revenue you lose over 12 months. Free, no signup, runs in your browser.
Open tool →Calculate LTV in gross profit with churn, expansion and time discount, see the LTV:CAC ratio and CAC payback. Free, no signup, runs in your browser.
Open tool →Calculate normalized MRR, ARR, net new MRR and quick ratio for the month, then project compound growth to your ARR target. Free, no signup.
Open tool →Work out a selling price from unit cost, fixed costs, taxes, fees and the profit you want, see what the price is made of and compare it with the market.
Open tool →Calculate profit margin and markup in both directions, with card and marketplace fees, and find the price that delivers the margin you want. Free.
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