preply.com

Readiness by lane

Green: preply.com. Thin bar: Education & Online Learning peer median.

Priority fixes for preply.com

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Accelerate

   Modern image formats in use

   Observed: The homepage had 27 images and none used WebP or AVIF.

   Why it matters: WebP and AVIF are typically much smaller than JPEG or PNG at similar quality, and images are often the heaviest part of a page.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   On Cloudflare: Cloudflare Polish can convert images to WebP.

   32% of Education & Online Learning peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

2. Priority 2 · Harden

   CAA records limit who can issue certificates

   Observed: No CAA record was found for preply.com, so any public certificate authority may issue for it.

   What to do: Publish CAA records naming every CA you actually use, including the CAs your CDN uses for managed certificates. Add an iodef contact if you want reports.

   On Cloudflare: Cloudflare documents which CAs its managed certificates need; include them in your CAA records.

   13% of Education & Online Learning peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

3. Priority 3 · Harden

   DNSSEC signed

   Observed: No DS record was found for preply.com at its parent zone, so its DNS answers are not DNSSEC-signed.

   What to do: Enable DNSSEC at your DNS provider, then add the DS record at your registrar. Plan provider moves carefully: a stale DS record can make the domain fail to resolve.

   On Cloudflare: Enable DNSSEC in DNS > Settings and add the DS record at the registrar.

   8.1% of Education & Online Learning peers do this.

   Guide: Website Uptime Readiness: Prepare Before Traffic Arrives

4. Priority 4 · Recover

   Nameservers spread across providers

   Observed: All nameservers for preply.com belong to Cloudflare.

   What to do: Treat this as an advanced step. Add a secondary DNS provider through zone transfers or a multi-provider setup, then test changes carefully, since both providers must stay in sync.

   On Cloudflare: Cloudflare supports zone transfers for primary or secondary DNS setups on eligible plans.

   13% of Education & Online Learning peers do this.

   Guide: Website Uptime Readiness: Prepare Before Traffic Arrives

What preply.com already does well

Practices fewer than half of Education & Online Learning peers use.

• security.txt publishedsecurity.txt with a contact found.5% of peers
• Content Security Policy presentContent-Security-Policy present.25% of peers
• HTTP/3 advertisedHTTP/3 advertised.25% of peers

What we saw

Homepage checked

https://preply.com/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Google Trust Services, 90-day validity, expiring 2026-12-23

CDN or edge

Cloudflare

Platform or framework

Next.js

DNS operators

Cloudflare

HSTS

max-age 730 days, includeSubDomains, preload

DMARC policy

p=reject

Homepage HTML

1,292 KB, br

Images on homepage

27 (jpg 244, png 14, svg 2, gif 1)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other Education & Online Learning sites

• evvelcevap.com90
• letudiant.fr92
• novakidschool.com86
• studyinsaudi.sa86
• taleem360.com89

Education & Online Learning readiness benchmark