Compare ยท as of November 2026
Tally vs DataFast
Both tie revenue to the traffic that brought it, both start at $9 a month with a 14-day trial and no card. The difference is in what you can check: Tally gives every sale a receipt and says how much of your revenue it could link.
14 days free, no card needed.
01In short
DataFast is the category's best-known revenue analytics, with more payment integrations, a Payment API for the rest, Meta ads attribution and a Plausible import. Tally reads four providers (Stripe, Paddle, Lemon Squeezy and Polar) and puts its weight on proof: a receipt with method and confidence for each sale, a coverage figure with the fix for what isn't linked, and every site on every plan. It reads DataFast's tag calls, so switching is a tag swap.
02Side by side
| DataFast | Tally | |
|---|---|---|
| Price | Starter is $9/month for 1 website at 10k monthly events; Growth is $19/month for 30 websites at the same tier. Yearly billing gives 2 months free. [1] | From $9 a month for 10k events, with every site and every feature on every step. A year costs 9 months. |
| Trial | 14 days free, no credit card. [1] | 14 days free, no card needed. |
| Payment providers | Native integrations with Stripe, Lemon Squeezy, Polar and Shopify, a Paddle guide in the docs, and a Payment API for other providers. [1][2][4] | Stripe, Paddle, Lemon Squeezy and Polar, each connected with a key you create, with the past 365 days imported. |
| Linking a sale | Your checkout code passes datafast_visitor_id and datafast_session_id as metadata. [3] | Strongest first: the visitor's id in checkout metadata, Payment Links tagged by the snippet, the success page's session id, then the buyer's email. Each sale's receipt names the method used. |
| Cookies | The default script sets cookies to recognise returning visitors; a cookieless script is offered and described as less accurate. [1] | Chosen per site: one first-party cookie, cookieless, or cookieless until your consent banner says yes. |
| AI traffic | An AI channel for ChatGPT and Claude, and AI bot requests counted, 100K a month on each plan. [8][1] | Visitors from AI assistants get a channel of their own; AI crawlers are counted apart, reported by a few lines on your server. |
| Realtime | Visitors on an interactive 3D globe, later joined by 2D map styles and a replay of the globe. [6][5] | Who is on the site now, on a live globe or a flat map. |
| API and assistants | A full API, a CLI and an MCP server with OAuth sign-in for assistants. [1][5][7] | A REST API, a command line and an MCP server, over the same numbers as the dashboard. |
| Importing history | Imports from Plausible. [1] | No import of other analytics: visits start when the snippet goes on, payments come in from 365 days back. |
03Where DataFast is better
- More ways to take payments are covered: Shopify among the native integrations, and any other provider through its Payment API. [1][4]
- Meta ads attribution is listed in its changelog; Tally doesn't read ad accounts. [5]
- It imports your Plausible history, so a dashboard can start with your past traffic. [1]
- Its changelog lists a mobile app, which Tally doesn't have. [5]
04What Tally does differently
- Every sale has a receipt: the buyer's first visit, the visits after, the one credited, what tied the payment to that browser and the payment, with the method and how sure it is. A sale nothing links says so.
- Coverage shows how much of your revenue is linked to a visitor, each reason the rest isn't, and the snippet that fixes it.
- Every site is on every plan: the price follows your monthly events and nothing else.
- Session replay and heatmaps sit beside the money: watch the visit behind a sale from its receipt.
- Consent-first mode stays cookieless until your banner says yes, then sets the cookie.
05Switching from DataFast
- Swap one tag. Tally reads window.datafast() goals, data-fast-goal attributes with their data-fast-goal-* properties, and data-website-id in place of data-site, so the rest of your pages keep working.
- Returning visitors keep their datafast_visitor_id, so checkout code that already passes it keeps linking sales, and so does the datafast_visitor_id already in your Stripe metadata.
- Connect your provider with a key and its past 365 days of payments come in at once.
06Questions
Do I have to change my checkout code to switch?
No. Tally reads datafast_visitor_id from your checkout metadata as it reads its own key, so sales keep linking from the first day. The Coverage page shows which sales still lack an id, and the code to add it.
How is a sale credited when the buyer visited several times?
To their last visit that didn't come direct, or their last visit if all of them did. The first visit is recorded too, and the receipt shows both, so you can see first touch and the credited touch side by side.
What happens to sales Tally can't link?
They're counted in your revenue as unlinked, never handed to a guessed source. Coverage adds them up, sorts them by reason and gives the fix for each, with what each fix is worth.
07Sources
Each statement about DataFast comes from DataFast's own pages, read on November 9, 2026. Products change: check theirs before you decide.
- DataFast: home page, pricing and FAQdatafa.st
- DataFast docs: Paddle checkout APIdatafa.st
- DataFast docs: Stripe Checkout APIdatafa.st
- DataFast docs: Payments APIdatafa.st
- DataFast changelogdatafa.st
- DataFast changelog: real-time mapdatafa.st
- DataFast docs: MCP introductiondatafa.st
- DataFast changelog: traffic channel categorizationdatafa.st