Fastify: Speed & SEO Optimizer

Accelerate sales with faster page loads and enhanced SEO.

by Sinly · Launched: July 2024 · Free plan available.

5.0 (20) on Shopify Built for Shopify

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SEO image optimizer & page speed booster with alt text generator & image compress to improve speed!

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About Fastify: Speed & SEO Optimizer

‏Fastify offers all-in-one page speed optimization and SEO tools. Enhance SEO rankings with tailored alt text and image compression, speeding up page loads effortlessly. Improve user experience with faster speeds, driving higher traffic, conversions, and sales. Our intuitive interface simplifies store performance management for seamless integration and impactful results. Convert PNG & JPG to Webp for optimized images and use our instant speed app preloading extension for enhanced performance. SEO booster & speed optimizer to boost google search rankings. Auto page speed optimizer for site speed score boost through image optimization. One-click image SEO, image compression, PNG & JPG to Webp, alt text generator. SEO report, Live analytics, SEO optimizer & image optimization for more traffic. Image optimization without losing display quality, generator for alt text. Show more Show less

Last verified: July 16, 2026 · Fresh

App details

Developer: Sinly
Category: Store design
Pricing: Free plan available
Launched: July 2024
Rating: 5.0 (20) on Shopify

Key features

SEO image optimizer & page speed booster with alt text generator & image compress to improve speed!

1 plan · starts free · 7-day free trial

Free

Plans and prices as listed on the Shopify App Store.

Ratings & reviews

based on 20 Shopify App Store reviews

Use the arrows to read individual reviews

This app boosted my site's SEO quickly and effectively. Highly recommended!

— skylebs

it made my website 7 times faster its fire!

— onewaykitchen

The support team is perfect,the app has help me a lot

— KOYS

Incredible app, has significantly improved my store's performance and boosted sales. Highly recommended for anyone serious about e-commerce success!

— PawFect

A great app, its really helped me boost my website speed and all the other performances. Also a great help from the developer team!!!

— SmartAir

Fastify is an amazing app for my Shopify store. It boosted my site's loading speed and improved my SEO. The image compression feature works great without losing quality. I've seen a clear increase in traffic and sales since using it. Highly recommend!

— Trizzy

זה מטורףףף בהתחלה האתר שלי היה נתקע כל הזמן וניסיתי מלא שיטות ומלא דברים שונים ושום דבר לא עזר ואז חבר שלח לי את האפליקציה הזאת וזה פשוט מטורף הכל נפתח מהר קישורים טעינה של האתר פשוט רץ זה מדהים! ואפילו השירות שלהם נגיש וזמין ובניגוד למקומות אחרים גם עוזר ממליץ בחום

— ultrafit

That is a must app if you want your store to succeed, Got me to 20%+ more sales. The app is really taking care of the little details.

— Vexo

I love this app it has really helped me improve my store and the amount of people that come to my store!

— FreshSmile

The app functions perfectly without any bugs. The support team is eager to offer free tips to improve speed and assist with any needs!

— Cedenza

excellent app, good support and makes the website 5 times faster.

— FrostyPlus

amazing websight i realy recomand it. it helped me alot

— Blankby

Best App EVER!! improved my site speed ALOT thanks!!

— PatzPatz

This is by far the best Speed and SEO optimizer I ever used. Accessible, convenient, and easy to use. Keep with the hard work

— KeySes

Great app. Works very well, love it.

— Modern Read

Thank you! An excellent application that helped me with the seo of the site already after a short time.

— Luna

the app works great, and the support is amazing! I highly recommend using it

— BLIZZ

This application really improved my speed on the site and it does a better job than any other application that costs money, I highly recommend it

— Vylor

very good support ,the app works well without any bug. the support dont hesitate to give free tips to improve the speed and take in order to help. Thanks!

— FuryHome