Tools

Useful tools for growth work.

Fast calculators and builders for common tasks.

Token Calculator

Estimate prompt size.

Prompt tokenize
estimated 1,248 tokens
words842
chars4.9k

AI Model Cost Calculator

Compare API costs.

Model comparison 100k in · 20k out
ModelInputTotal
Luna lowest cost
$0.05 $0.010
Flash standard
$0.30 $0.054
Sol standard
$1.00 $0.200
Sonnet standard
$2.00 $0.400

UTM Builder

Build tracking URLs.

Campaign URL utm
URL example.com/launch
Sourcelinkedin
Mediumsocial
Campaignoct-launch
?utm_source=linkedin&utm_medium=social&utm_campaign=oct-launch

A/B Testing Calculator

Compare conversion rates.

A/B test 95% confidence
Control 5.00% 500 / 10,000
Variant 5.75% 575 / 10,000
Relative lift +15.0%
confidence 98.0%

Experiment Sample Size Calculator

Estimate required traffic.

Sample size 95% · 80% power
Baseline5.00%
Min. lift+10%
Required / variant 31,267

Experiment Duration Calculator

Estimate test length.

Test duration traffic model
Sample / variant18,000
Visitors / day2,500
Variants2
Estimated 15 days

GA4 Event Builder

Build and validate GA4 events.

GA4 event gtag.js
Event generate_lead
currencyUSD
value100
gtag("event",
"generate_lead", {
currency: "USD",
value: 100
});