Free tool · No signup · Runs in your browser

Free cohort retention tool — no SQL.

Dr Waqas Rafique · Founder & CTO
LinkedIn · About

Paste customer + transaction data (or signup/activity events). The calculator groups customers by acquisition month, then counts what fraction were active at month 1, 2, 3 and beyond. Heatmap, retention curves, and CSV export — all in your browser. No signup, no upload, no Mixpanel-style $79+/month tier.

Browser-only — privacy-friendly Heatmap + retention curve CSV export Up to 50,000 rows

1Your data

Paste rows: customer_id, date per line

Two columns: customer ID (any string) and a date (YYYY-MM-DD or DD/MM/YYYY). One row per transaction or activity event. Customers are grouped by their first-seen month.

2Bucket size

Group cohorts by

📊

Ready when you are

Paste customer activity data and click Calculate retention. Or hit Load sample for a 12-month example with 200 customers.

What is cohort retention analysis?

Cohort retention groups customers by when they first arrived (the "acquisition cohort") and then measures what fraction stay active at month 1, month 3, month 12. It separates "new growth" from "keeping existing customers around" — two metrics that look the same in a single revenue number but tell completely different stories.

Why it matters

SaaS: cohort retention > 90% at month 12 = product-market fit. Below 70% = leaky bucket.
E-commerce: month-3 repeat-purchase rate predicts customer lifetime value better than any other single metric.
Mobile / consumer: D1, D7, D30 retention is the standard launch metric for new features.

What the heatmap shows

Each row = one acquisition cohort (e.g. customers acquired in March 2025).
Each column = months since acquisition (M0, M1, M2…).
Each cell = % of that cohort who were active in that month.
Colour intensity scales with the value — darker shades mean higher retention.

How this calculator differs from Mixpanel / Amplitude

Mixpanel and Amplitude have polished cohort UIs but charge $79+/month and require event tracking integration. This calculator works on the data you already have — a CSV with customer ID + date — and runs in your browser with no signup. For more advanced cohort analyses (segmentation, predictive churn, multi-event funnels), the full DataHub Pro platform handles them at from $14.99/mo.

Limits of this calculator

Activity = any row with that customer ID; doesn't distinguish between transaction types.
Up to 50,000 rows in the browser before performance degrades.
Single dimension (acquisition cohort × months); no segmentation.
For deeper cohort work, see the SaaS analytics or e-commerce analytics pages.

Frequently asked questions

Is the cohort retention tool really free?

Yes — completely free, no signup, runs entirely in your browser. Your data never leaves the tab.

What data format does it expect?

Two columns: customer_id and a date (signup or any transaction date). One row per event. Paste from Excel or use the sample data button to see the format.

What's the difference between logo retention and revenue retention?

Logo retention counts customers; revenue retention sums transaction value. Both are built into the tool — toggle between them with the buttons. For SaaS, net revenue retention (NRR) is the more important metric.

How many cohorts can it handle?

Tested up to 500 cohorts with 50,000+ customers. Larger datasets work but the heatmap becomes hard to read; use DataHub Pro's full product for serious cohort work at scale.

Can I export the cohort table?

Yes — CSV download of the full cohort retention matrix.