Competitor tracking for one Shopify brand
What your rivals
actually sold, by 07:00
Name up to 20 Shopify brands. Charted Line reads their catalogues and their public review counts every day, and sends one Brief ranked by what should change your week.
A live read of any public Shopify storefront. No account, no card.
Or read a Brief first. Daily recording and the Brief start with a Pass, $49 for 30 days.
Spend is intent. Reviews are results
Every tool built for this job leads with ad spend, because ad spend is easy to buy from a library. A brand can burn $200,000 on a product nobody reorders. You need the other half of the sentence.
What the others measure
$184,000
Estimated 30-day ad spend across 5,000,000 stores you do not compete with, plus a store-level revenue guess.
- Modelled, not observed
- Per store, never per product
- Breadth you will never open twice
What Charted Line measures
14.2reviews/day
One product, on one brand you named, counted from the review widget its own storefront publishes. Yesterday, and every day before it.
- Observed, with a date on it
- Per product, per day
- Depth on the 20 that matter
Reviews added per day, per product
Snapshot a storefront’s review counts daily and the derivative is the reading: this product is genuinely being bought and re-bought, right now. Four products from one brand, over 90 days.
Barrier repair cream, 50ml
14.2
reviews/day+358%in 30 days
One email. Read it before your laptop opens
3 to 7 Movements, ranked. What moved, by how much, and when it was first seen. It ends on the same line every day, and it is sent even when nothing moved, because a quiet market is information.
brief@chartedline.nanocorp.app
31 Aug 2026 · 07:00
Subject
northaven: barrier repair cream at 14.2 reviews/day, +358%
4 Movements on the 12 brands you watch. Ranked by how much they should change your week.
northaven
Barrier repair cream, 50ml
3.1 reviews/day 30 days ago. First seen 14 Feb 2026.
14.2+358%cedar & rye
Vetiver hand wash, 300ml
Held for 21 days. Price unchanged at $24.
5.1−4%stepwell
Merino crew, charcoal
Compare-at added. $68 → $44, a 35% cut, 2 days ago.
2.0−55%havn
Ceramic diffuser, sand
Not in the catalogue 4 days ago. 6 variants, 2 sold out.
1.5new
Read again tomorrow at 07:00.
Specimen Brief. Brand names and figures are illustrative
Three things happen. Only one of them is yours
- 01One field
You name them
Paste the domains of the rivals you already know by name. Up to 20. No account, no card, no category questionnaire.
- 02Public evidence
We read them, daily
Every public storefront publishes its catalogue as JSON, and almost every one publishes a review count per product. We snapshot both, every day, and keep the whole series.
- 03Before your laptop
One Brief at 07:00
3 to 7 Movements, ranked by how much they should change your week. What moved, by how much, when it was first seen. You draw the conclusion.
Observed, never estimated
A review count is a public fact with a date on it. We publish the count and the derivative, and we never model a revenue figure and call it a reading.
Results, not spend
A brand can spend $200,000 on a product nobody reorders. Ad spend tells you what a rival is betting. Reviews added per day tell you what is being bought.
Depth on 20, not breadth on 5 million
You do not need discovery. You need surveillance of the specific set you compete with, recorded on the mornings you forget to look.
The History is yours
A Velocity chart is worth little on day 1 and hard to replace on day 90. Nothing is deleted for non-payment, ever. A lapsed Pass keeps every day of it.
A purchase you can stop making
No subscription and no auto-renewal. The Brief on day 26 says the Pass ends in 4 days, plainly, and buying another extends it. We win the month again every month, which is the discipline that keeps the Brief worth opening.
Free
$0
Read any brand live, as often as you like, and see its catalogue and price movements. No card.
Read a brand nowPass
$4930 days
Up to 20 brands, the full daily Brief and the full recorded History. It ends on its date and nothing renews.
Buy a Pass, $49Founding Pass
$349once
The same 20-brand cap, with no end date. Limited to the first 100 buyers, and the option disappears when they are taken.
Buy the Founding Pass, $349You can already list your rivals from memory. That is the whole setup
Free, and it takes one field. Questions go to hello@chartedline.nanocorp.app.