ESC Size Charts alternative: Quicksloth Size Chart

Last updated: 13 October 2026

If you use ESC Size Charts on your Shopify store and your chart has stopped showing, or you are looking at the Shopify changes of 2027, this page tells you what is happening, with dates and sources, and what you can do today to keep your charts safe.

Quicksloth Size Chart is not available yet. We are building it for the Shopify App Store, and this page will link to the listing as soon as it is live.

Short version: save a copy of your size charts now, if you can still open ESC Size Charts. You do not need to uninstall anything today.

What is happening, with dates

Two Shopify dates that can affect apps on your store

• 1 January 2027: expiring access tokens. Shopify's developer changelog of 20 May 2026 (Expiring offline access tokens required for all public apps as of January 1, 2027) says: "Starting January 1, 2027, all public apps must use expiring offline access tokens when calling the Admin API." and "After that date, public apps still using non-expiring tokens will receive authentication errors." This concerns the part of an app that talks to your store's admin (saving charts, reading your products), and it applies to apps created before 1 April 2026 that have not switched. Whether a given app has switched cannot be seen from outside.
• 1 March 2027: script tags. Shopify's changelog of 24 August 2026 (Script tags are deprecated and will stop running on March 1, 2027) says: "On March 1, 2027, Shopify will stop injecting script tags into storefronts." Developers are told to "Replace each script tag with an app embed block, which you ship in a theme app extension." Script tags are one of the ways an app can add content, such as a size chart link, to your storefront.

What the ESC Size Charts listing says

Read on 12 October 2026 on the Shopify App Store listing; it may have changed since.

• Launched 2 August 2016. Developer: Eastside Co.
• Basic plan, free: "Create up to 3 charts", "ESC watermark on charts on Basic Plan". Premium plan, $4.99 per month: "Unlimited charts", "No watermark on charts", "Import and export charts", "7-day free trial".
• "Fully compatible with Shopify 2.0 using app blocks".
• The listing shows Shopify's "Built for Shopify" badge ("Meets our highest standards for performance, design, and integration"). Shopify gives the badge to apps that meet its requirements; one of them reads: "If your app is meant to be used in a merchant's online store, then you need to use theme app extensions" (Built for Shopify requirement 3.2.1, read on 12 October 2026).
• Data access: permission to edit "Online Store script tags, theme". A permission is not proof of use: we do not know whether the app shows the chart on your store through a script tag, through an app block, or both.

What recent reviews say

• Reviews on the Shopify App Store dated 29 June, 6 August, 10 August, 29 September, 2 October and 7 October 2026, all one star (one-star reviews, read on 12 October 2026), report that the app stopped working, that its admin does not open, or that support did not reply. None of them shows a reply from the developer.
• The most recent developer reply we found on the review pages we read is dated 23 August 2022 (four-star reviews).
• The listing shows a rating of 3.3 on 139 reviews.
• We do not know Eastside Co's plans and we do not speak for them. If ESC Size Charts is updated, you may not need to move at all. You can ask them through the support link on their listing.

What to do today

1. Save a copy of your charts. On ESC's Premium plan, try its export first (their listing: "Import and export charts"; a one-star review of 25 June 2024 says it did not work for that store). On the Basic plan, open each chart in ESC's editor and copy the table into a spreadsheet (Excel, Google Sheets or Numbers), one sheet per chart. Save your "how to measure" images too.
2. Write down where each chart is used: which products, collections, tags, vendors or product types. You will need this list with any size chart app.
3. Check your product pages on a desktop and on a phone. If the chart no longer shows, your copy from step 1 is what you rebuild from.
4. Keep ESC Size Charts installed until you have a replacement working. Uninstalling first leaves your product pages without a chart.

You can also show a chart without any app: our guide to adding a size chart in Shopify's free themes (Dawn and Horizon), with one chart per product type.

What we are building

Quicksloth Size Chart is a size chart app for Shopify, in development. These are design choices, not features you can try yet:

• No script tags. The chart is designed to reach your storefront only through a theme app extension (an app block, or an app embed for older themes), the method Shopify asks developers to use.
• Ready for the January 2027 rule. The app is new, so it uses Shopify's current way of connecting to your store's admin from day one.
• Your charts come with you. Export of all your charts to a CSV file is planned for every plan, the free one included, so your charts are not tied to the app.
• No size recommender and no AI. A clear table, with a link or button next to your variants.

Prices, plans and the full list of features will be on this page and on the App Store listing when the app is live, after we have tested it on a real store.

Questions and answers

Will my ESC chart stop showing on 1 March 2027?

We do not know. It depends on how ESC Size Charts delivers the chart to your theme, which we cannot see from outside. If the chart comes from an app block you added in the theme editor, the March date does not concern it. The January date concerns the app's connection to your store's admin, not the storefront. Eastside Co can tell you how their app is built.

When will Quicksloth Size Chart be available?

We do not have a date yet. We aim to submit the app to Shopify in January 2027 and to be listed before 1 March 2027. Shopify reviews every app before it appears in the App Store, and the review time is not in our hands: this is a plan, not a promise.

Will it import my charts from ESC Size Charts?

Not at launch. The plan is that you paste each table from a spreadsheet, which is why a copy of your charts (step 1 above) is useful with any app.

Is Quicksloth connected to Eastside Co?

No. Quicksloth is an independent developer.

Questions?

Write to support@quicksloth.dev. We aim to send a first reply within 2 business days (Monday to Friday, Italian time, excluding Italian public holidays).

Information about ESC Size Charts comes from its public Shopify App Store listing and review pages, read on 12 October 2026; it may have changed since. ESC Size Charts is a product of Eastside Co. Quicksloth is an independent developer and is not affiliated with Eastside Co or Shopify. Shopify is a trademark of Shopify Inc.