4 focused apps, rated up to 5.0 on the App Store

Shopify Apps & AI Tools that help merchants grow

Small apps. Serious growth.

Nitro Apps builds focused Shopify apps that help you design a better store, sell more per order and keep every page fast.

Explore the apps Read the guides

Nitro Upsell 5.0

KallesShopify theme by The4

Stockify 4.5

Fontify 4.9

EcomusShopify theme by The4

Nitro Lookbook 5.0

ChatPage 5.0

AthoraShopify theme by The4

VetroShopify theme by The4

Rated on the Shopify App Store

5.0 Nitro Upsell
4.9 Fontify
4.5 Stockify
5.0 Nitro Lookbook

Four apps. One job: a better store.

Each Nitro app does one thing really well, installs in minutes and works on any Online Store 2.0 theme.

AI store builder + CRO

Nitro Upsell & Cross-Sell

AI designs your store. Built-in CRO tools grow your revenue.

Generate your theme, product pages and images with AI, then lift average order value with upsells, bundles, shoppable video and 12 built-in conversion tools.

5.0 ★ on the Shopify App Store

View on the Shopify App Store

Nitro Upsell features: quantity breaks, product bundles, buy X get Y, cart upsell, sale notifications, shoppable video, trust badges and age verification

Typography

Fontify
4.9 ★

Google and custom fonts on any theme, no code.
AaSans AaSerif AaDisplay AaCustom
- Google Fonts
- Custom font upload
- Font audit
- No code
Real people on support

Named in our reviews, not hidden behind a bot.

Merchants thank our support team by name in App Store reviews. Meet a few of the 16 people behind every reply.
- +10
Pre-orders

Stockify Pre-order
4.5 ★

Effortless pre-orders for upcoming and out-of-stock products.
Shoppable galleries

Nitro Lookbook
5.0 ★

Turn lifestyle photos into shoppable lookbooks with product pins.
AI landing pages

ChatPage
5.0 ★

Build a landing page in Claude, ChatGPT, Gemini or Grok and publish it in your theme.

Nitro Apps support chat with quick, multilingual replies

Real people answer, usually within the hour.

Every Nitro app comes with fast, multilingual support. Stuck on setup or want a hand matching your theme? Just ask.

Contact support

Merchants say it best

Real 5-star reviews from the Shopify App Store. Hover to pause.

Read all reviews on the Shopify App Store

VEFA Gallery United States · Fontify
★★★★★
Fontify has been an excellent app overall, but what really made the experience stand out was their customer support. … Their customer service truly saved the day.
BellaShaper Shapewear Premium Brazil · Nitro Upsell
★★★★★
Great app! Very user friendly and makes it so much easier to update the theme and import templates. The Shopable video feature is amazing.
Yoga Junkies Austria · Nitro Upsell
★★★★★
I’ve used this app for over two years, mainly for the Product Bundle features, and it’s definitely helped boost cross-sells in my store. The new Shoppable Video feature is fantastic as well, it saves me from installing another autoplay video app.
Little Lady Smocks United States · Fontify
★★★★★
I spent hours going back and forth with ChatGPT trying to change the font on my website through manual coding and nothing worked … Fontify and the help assistant made it so easy and got it done in 30 mins total!
Diffney Menswear Ireland · Nitro Lookbook
★★★★★
This app is exactly what we were looking for. While still in its infancy, it will have the occasional glitch or bug, but Jade from support was quick to jump on the problem. Highly recommend!
Yoga Junkies Austria · Stockify
★★★★★
Great addition to a store with Pre-orders and perks like timers to create urgency.
VEFA Gallery United States · Fontify
★★★★★
Fontify has been an excellent app overall, but what really made the experience stand out was their customer support. … Their customer service truly saved the day.
BellaShaper Shapewear Premium Brazil · Nitro Upsell
★★★★★
Great app! Very user friendly and makes it so much easier to update the theme and import templates. The Shopable video feature is amazing.
Yoga Junkies Austria · Nitro Upsell
★★★★★
I’ve used this app for over two years, mainly for the Product Bundle features, and it’s definitely helped boost cross-sells in my store. The new Shoppable Video feature is fantastic as well, it saves me from installing another autoplay video app.
Little Lady Smocks United States · Fontify
★★★★★
I spent hours going back and forth with ChatGPT trying to change the font on my website through manual coding and nothing worked … Fontify and the help assistant made it so easy and got it done in 30 mins total!
Diffney Menswear Ireland · Nitro Lookbook
★★★★★
This app is exactly what we were looking for. While still in its infancy, it will have the occasional glitch or bug, but Jade from support was quick to jump on the problem. Highly recommend!
Yoga Junkies Austria · Stockify
★★★★★
Great addition to a store with Pre-orders and perks like timers to create urgency.

Energia Absoluta Brazil · Nitro Upsell
★★★★★
Amazing support team. Helpful, quick, and polite, especially Luna who answered all my questions very quickly and cordially. She helped me install the app and even created a specific CSS code to meet my needs. I highly recommend them.
mia vesper United States · Nitro Lookbook
★★★★★
After trying multiple lookbook apps that did not work well, this one by Nitro was just what we needed. It has great functionality and customization options.
COSTA NOVA Portugal · Nitro Lookbook
★★★★★
An app with very good functionality and strong features. It allows you to customize almost everything according to the brand’s visual identity through code, and the support team is very helpful in this and other situations.
J. Francis Soap Co. United States · Stockify
★★★★★
Chatting with customer service was so great! They took the time to answer my questions and gave great photos of how and where to add buttons and other items needed for the app to work with the product's webpage. So excited to continue working with the app to help my business grow.
Summit Socks Australia · Nitro Upsell
★★★★★
Absolutely love this app! Incredibly intuitive and easy to use. What really sets it apart is the outstanding support. … Highly recommend this app if you want hassle-free bundles and top-tier support!
MISS KICK United Kingdom · Fontify
★★★★★
Seamless setup & clear instructions on all steps required, if any doubts you have the support team on hand who will walk you through any queries you may have. Thank you to Hana & all the team at Fontify with the guidance & questions i had. I would highly recommend.
Energia Absoluta Brazil · Nitro Upsell
★★★★★
Amazing support team. Helpful, quick, and polite, especially Luna who answered all my questions very quickly and cordially. She helped me install the app and even created a specific CSS code to meet my needs. I highly recommend them.
mia vesper United States · Nitro Lookbook
★★★★★
After trying multiple lookbook apps that did not work well, this one by Nitro was just what we needed. It has great functionality and customization options.
COSTA NOVA Portugal · Nitro Lookbook
★★★★★
An app with very good functionality and strong features. It allows you to customize almost everything according to the brand’s visual identity through code, and the support team is very helpful in this and other situations.
J. Francis Soap Co. United States · Stockify
★★★★★
Chatting with customer service was so great! They took the time to answer my questions and gave great photos of how and where to add buttons and other items needed for the app to work with the product's webpage. So excited to continue working with the app to help my business grow.
Summit Socks Australia · Nitro Upsell
★★★★★
Absolutely love this app! Incredibly intuitive and easy to use. What really sets it apart is the outstanding support. … Highly recommend this app if you want hassle-free bundles and top-tier support!
MISS KICK United Kingdom · Fontify
★★★★★
Seamless setup & clear instructions on all steps required, if any doubts you have the support team on hand who will walk you through any queries you may have. Thank you to Hana & all the team at Fontify with the guidance & questions i had. I would highly recommend.

BarkLoyal Israel · Nitro Upsell
★★★★★
This app is fantastic! Very easy to set up and works seamlessly with Shopify. The bundle and upsell features are exactly what I needed to boost my store’s sales. The support team is also quick, friendly, and always helpful.
Genn Stores United States · Stockify
★★★★★
Very useful app that you can sell pre-orders for any new products in plan or/and out of stock products. The app's support team is very professional and prompt with much patience.
Lazy Doxie Co Australia · Stockify
★★★★★
Product is great and the support team are fantastic, were able to help me customise my listings, align products and get items working where I couldnt. Highly recommend this product!
ZS Originals United States · Nitro Lookbook
★★★★★
Excellent and responive customer support team! I was trying to get a watermark removed from an image and they did it in less than five minutes! The shoppable image works great for using a map and putting hotspots for locations of products.
THE DRVR CO United States · Stockify
★★★★★
This app is great, free, and gets the Job done. Eric from their support was very helpful as well!
GREEN CRUSH United States · Fontify
★★★★★
A great experience from start to finish. They were very helpful in assisting us with updating the fonts on our website and made the process seamless. Their responsiveness and attention to detail made a big difference. We’re very happy with the result.
BarkLoyal Israel · Nitro Upsell
★★★★★
This app is fantastic! Very easy to set up and works seamlessly with Shopify. The bundle and upsell features are exactly what I needed to boost my store’s sales. The support team is also quick, friendly, and always helpful.
Genn Stores United States · Stockify
★★★★★
Very useful app that you can sell pre-orders for any new products in plan or/and out of stock products. The app's support team is very professional and prompt with much patience.
Lazy Doxie Co Australia · Stockify
★★★★★
Product is great and the support team are fantastic, were able to help me customise my listings, align products and get items working where I couldnt. Highly recommend this product!
ZS Originals United States · Nitro Lookbook
★★★★★
Excellent and responive customer support team! I was trying to get a watermark removed from an image and they did it in less than five minutes! The shoppable image works great for using a map and putting hotspots for locations of products.
THE DRVR CO United States · Stockify
★★★★★
This app is great, free, and gets the Job done. Eric from their support was very helpful as well!
GREEN CRUSH United States · Fontify
★★★★★
A great experience from start to finish. They were very helpful in assisting us with updating the fonts on our website and made the process seamless. Their responsiveness and attention to detail made a big difference. We’re very happy with the result.

Our theme studio

From the team behind Kalles & Ecomus

Nitro Apps comes from The4, the studio behind some of the most popular Shopify themes. Our apps are built to feel at home in the themes merchants already love.

Explore The4 themes