Free marketing tools Small tools for everyday analytics questions
Build a tracked link, check whether a conversion lift is real, turn a cohort table into retention rates, or see which AI crawlers your robots.txt actually blocks. No account, no upload — everything runs on this page.
- Nothing leaves your browser
- No sign-up, no limits
- Same formulas as the TapCub reports
Pick the question, get the number
Each tool does one job, shows its formula, and links to the TapCub report that answers the same question automatically once your site is connected.
UTM link builder
Compose a campaign URL with source, medium, campaign, term and content — normalized so reports stay clean.
- Presets for the usual sources and mediums
- Lower-case and underscore normalization
- Copy-ready link and a parameter breakdown
Conversion rate calculator
Visitors and conversions in, rate out — plus an A/B comparison with a two-proportion z-test.
- 95% confidence interval for each group
- Absolute and relative lift
- Plain-language significance verdict
Retention calculator
Enter new users and returners per period and get retention rates, a bar matrix and the weighted average.
- Up to 10 periods, add or remove rows
- Weighted average, best and worst period
- Explains N-day vs range retention
AI crawler robots.txt checker
Paste your robots.txt and see which AI crawlers are allowed, partly restricted or blocked — then generate the rules you want.
- 11 common AI crawler user agents
- Shows the exact rule that decides each one
- Generates a copy-ready robots.txt snippet
Because the hard part is not the arithmetic
These calculators answer a one-off question. TapCub exists for the version of the question you ask every week — with your real traffic, filtered by segment, without pasting numbers into a form.
The formula is the easy part
Conversion rate is a division. Retention is a division. What is hard is agreeing on who counts as a visitor, which event counts as converting and how long a session lasts. The tools spell those definitions out.
The report is where it gets useful
A single rate tells you where you stand. A rate over time, split by channel or landing page, tells you what to change. Every tool links to the TapCub report that does that automatically.
No data needs to leave your machine
None of these tools call an API. The code that does the math is shipped to your browser and runs there, so you can paste real numbers — or a robots.txt you have not published yet.
One script, zero requests
Each tool is a small module loaded when it scrolls into view. Inputs are read from the form, results are written back to the page. There is no backend behind them.
- API calls made by any tool
- 0
- API calls made by any tool
- TapCub tracking script, gzipped
- ≈2 KB
- TapCub tracking script, gzipped
- AI crawler user agents checked
- 11
- AI crawler user agents checked
Works without JavaScript
Each page ships with a worked default already calculated. Enable scripts to edit the inputs and recalculate live.
Same math as the product
Rates, confidence intervals and retention cells use the same definitions as the reports in TapCub, so the numbers carry over.
Copy buttons, no clipboard tricks
Links and snippets are plain text in the page. Copy uses the standard clipboard API and falls back to selecting the text.
When the tool raises the next question
Definitions, migration notes and the glossary behind the numbers.
Why UV never matches
Two tools, two visitor counts. The reasons are boring and fixable — cookie policy, bots, time zone and session timeout.
Learn moreAn AI crawler ledger
Which AI crawlers visit a typical site in a month, how often, and what a sensible policy looks like.
Learn moreGlossary
Visitor, session, bounce, conversion, cohort and attribution — one definition each, as TapCub uses them.
Learn moreQuestions about the tools
Still have a question?
Chat with the team behind TapCub — we usually reply within a few hours on business days.
Do I need a TapCub account to use them?
No. The tools are public pages. An account only matters when you want the same numbers computed from your live traffic instead of typed in.
Is anything I type sent to TapCub?
No. There is no request behind any of the tools. We record that the tool page was viewed and that a demo was interacted with, like any other page — never the values.
Can I embed or link to a tool?
Linking is welcome. The pages have stable URLs under /tools. We do not offer an embed, but the formulas are documented on each page so you can reproduce them.
Why do my numbers differ from my analytics tool?
Usually the definition, not the arithmetic: who counts as a visitor, which event converts, and whether bots were removed first. Each tool lists the definition it assumes. See why UV never matches.
Will there be more tools?
When a question comes up often in support we turn it into a page. Suggestions go to contact.