Inline ‑ Critical CSS

Name: Inline ‑ Critical CSS
Brand: Speed Boostr
Rating: 2.6 (6 reviews)

Pricing: $10 one-time charge
Rating: 2.6 (6)
Developer: Speed Boostr

Install

Inline your Critical CSS to eliminate render-blocking resources. This will speed up your store.

With Critical CSS, the visitor gets the base styling as quickly as possible; because it’s right there in a <style> element in the document’s <head>, there’s: no extra request to the server for the stylesheet & no waiting for the requested styles to load in and render. The below-the-fold, or non-critical, styling is then loaded in the background to avoid render-blocking.

Your website will load faster, especially for first time users.
A faster load time will increase your conversation rate.
Rank higher in Google with a faster loading site.

Languages

English

Pricing

Choose the plan that best fits your business.

One-time charge

$10 one-time charge

All charges are billed in USD.

Reviews (6)

Overall rating

2.6

Counts per rating level

83% of ratings are 5 stars
5
0% of ratings are 4 stars
0% of ratings are 3 stars
0% of ratings are 2 stars
17% of ratings are 1 stars
1

All reviews

August 23, 2021

"Instant pagespeed increase for $10... yeah right?!" That's exactly what I said when I saw this app but thought I'd give it a go anyway, SO GLAD I DID! Having spent a few days trying to boost the speed of our store and only getting marginal gains my research lead me to this app. The install was super easy and instantly flagged up some unseen errors in my CSS (blame my template creators for that!), once I fixed those the app did its thing and added a snippet to the head for the critical css, I could then confidently move all the remaining stuff to the end of the body. I ran a pagespeed test before installation on the different page types and again after installation (plus cache clearing). I'm happy to report a very significant pagespeed increase across all pages! I had a few noob questions and the support was spot on and helpful. Honestly, this is a seriously good value for money app and really worth trying!

Skatewarehouse.co.uk

United Kingdom

3 days using the app

October 8, 2025

Installation nicht möglich. Man installiert, zahlt und die App verlangt erneut die Gebühr - VORSICHT.

2 Mal die Gebühr bezahlt und geht immer noch nicht.

Habe dem Support beide Rechnungen geschickt, die behaupten, ich hätte nicht bezahlt. shopify bestätigt die beiden Zahlungen, doch den Betreiber interessiert es nicht wirklich anstatt die App frei zu schalten, wurde ein Shopzugriff verlangt nur um mir zu sagen, dass ich angeblich nicht bezahlt habe, genau. Und alle Nachweise wie Rechnungen und so sind ja egal, weil Betreiber meint man hätte nicht bezahlt.

Man kann sicherlich sein Geld auch anders ausgeben, ein Burger wäre hier deutlich effektiver als die App

BLOODY-STREETS.DE

Germany

4 days using the app

Speed Boostr replied October 23, 2025

We’re really sorry to hear about your experience and understand how frustrating this must have been.

To clarify, when an app is installed on Shopify, Shopify itself automatically generates a charge once the merchant accepts the pricing screen. However, if the app is later uninstalled and then reinstalled, Shopify treats it as a new installation, which triggers a new charge.

After reviewing your account history, our logs show multiple installation and uninstallation events, which explains why additional charges appeared. Unfortunately, because the app was uninstalled again, we weren’t able to re-enable your access directly.

That said, we've already processed a full refund for the charge, so you won't be charged for anything.

We truly appreciate you bringing this to our attention and hope you’ll consider giving the app another try in the future. If you decide to reinstall, please contact us directly beforehand — we’ll make sure everything is set up smoothly for you.

August 4, 2021

One day since install opinion:
This helps us stream line our CSS and in conjunction with some other fixes we were able to get our page speed score up from a 28 to a 90(at its peak on mobile)! Great customer service, alex responding quickly and was ready to help however we needed. This is a one man team and he's doing great job!

NatureCity

United States

About 20 hours using the app