The best Shopify apps to increase sales are the ones that cover a specific revenue job your theme can’t: reviews and social proof, email and SMS, upsells, automated markdown pricing, subscriptions, search, and support. Everything else is weight. This guide lists the strongest free and paid pick for each job in 2026 — including the ones Shopify ships for free — and the one rule that matters more than any single app: install the fewest apps that cover the jobs, because every app you add costs page speed, and page speed is revenue.
The rule before the list: apps cost speed, and speed is sales
Every app you install adds JavaScript to your storefront. That cost is measurable: Deloitte’s Milliseconds Make Millions study (2020, with Google) found that a 0.1-second improvement in mobile site speed lifted retail conversions by 8.4% and average order value by 9.2%. Run that in reverse and you have the true price of a bloated app stack — it’s not the $19/month, it’s the conversion you bleed on every page load.
So before installing anything, check what your theme already does. A premium theme replaces the most common conversion apps outright — review sections, mega menus, sticky add-to-cart, FAQ accordions, color swatches, cart-drawer cross-sells. We covered that math in our premium Shopify themes buyer’s guide: the typical stack those features replace runs $90–$215/month. The apps below are the ones worth adding on top of a capable theme — the jobs no theme can do.
1. Reviews and social proof
Best pick: Judge.me (free plan available) · Photo-first alternative: Loox (paid)
Reviews are the highest-leverage trust signal on a product page, and review collection is genuinely an app job — your theme renders the stars, but something has to email customers after delivery, collect the reviews, and moderate them. Judge.me’s free plan covers unlimited review requests, which makes it the default answer for stores under a few thousand orders a month. Loox is the pick when your category sells on photos (beauty, apparel, home) and customer imagery is worth paying for.
Theme note: pick a review app that integrates as an app block rather than injected script — it renders inside your product page layout and keeps your Core Web Vitals intact. Every theme in our lineup exposes review app blocks natively.
2. Email and SMS
Best pick: Klaviyo (free tier for small lists) · Free pick: Shopify Email (included with Shopify, with a free monthly sending allowance)
Email is still the highest-ROI owned channel in ecommerce, and abandoned-cart recovery alone justifies the setup: Baymard Institute’s running average across 50 studies puts cart abandonment at 70.22%. A three-email recovery flow wins back a meaningful slice of that. Start with Shopify Email if your needs are campaigns plus basic automations; graduate to Klaviyo when you want segmentation, predictive flows, and SMS in one place. Don’t run both.
3. Upsells, cross-sells and bundles
Best pick: Rebuy (paid) · Free-first route: your theme’s cart drawer
Average order value is the quietest way to increase sales — same traffic, bigger carts. But this is the category with the worst app bloat, so exhaust the native route first: a good theme’s cart drawer already does “pairs with” cross-sells, and Shopify’s native product recommendations cover related-product rails. Add a dedicated engine like Rebuy only when you’re ready to run rules-based offers (post-purchase upsells, tiered gifts, smart bundles) and can measure the lift.
4. Automated markdowns and clearance pricing
Best pick: Auto Markdown (free plan available; paid plans from $9/month with a 7-day trial)
Full disclosure before the pitch: Auto Markdown is built by Palm Beach Themes, our sister brand — same company, different shelf. It’s in this list because it solves a problem every inventory-carrying store has and almost no store handles well: what to do with products that stop selling.
The usual answers are bad. A storewide sale gives your best sellers a discount they didn’t need. A manual clearance spreadsheet is a Sunday-evening job that never happens. Auto Markdown replaces both with velocity rules: prices drop based on days without a sale, not calendar dates, and the timer resets the moment a product sells. Stalled inventory keeps stepping down until it moves; healthy inventory never gets touched.
- Rules, not spreadsheets. Write a rule once — “drop the price 10% every 14 days without a sale” — and apply it by collection, product type, or vendor.
- Floor price protection. Set a minimum by fixed amount, percentage, or cost, and prices never fall below it. The markdown clears inventory without eating your margin.
- Automatic recovery. When a marked-down product sells, its original price restores automatically — no forgotten sale prices living on for months.
- A full audit trail. Every price change is logged, with analytics on markdown velocity and revenue recovered.
| Plan | Price | Covers |
|---|---|---|
| Free | $0 | 50 tracked products, 2 rules, daily checks |
| Growth | $9/mo | 500 products, 10 rules, 6-hour checks |
| Pro | $19/mo | 5,000 products, unlimited rules, hourly checks, CSV export |
| Enterprise | $39/mo | Unlimited products and rules, priority support |
The free plan (50 products, 2 rules) is enough to run a real clearance experiment on your slowest collection before paying anything. If you carry seasonal inventory, start there — the first month of data will tell you what your dead stock has been costing you.
5. Subscriptions
Free pick: Shopify Subscriptions (Shopify’s own app, free) · Scale pick: Recharge (paid)
If anything you sell is consumable or replenishable, recurring revenue is the single most durable way to increase sales — it compounds instead of resetting to zero each month. Shopify’s free Subscriptions app handles standard subscribe-and-save; Recharge earns its fee when you need complex billing logic, dunning, and a richer customer portal. We covered which themes render subscription options best in our guide to Shopify themes for subscription products.
6. Search and merchandising
Free pick: Shopify Search & Discovery (Shopify’s own app, free)
Visitors who use site search convert at a multiple of those who browse — they arrived knowing what they want. Shopify’s free Search & Discovery app adds synonyms, filters, product boosts, and related-product tuning. For most catalogs under a few thousand SKUs it makes paid search apps unnecessary. Configure synonyms for your category’s vocabulary (customers search “moisturizer”, your product says “hydrating cream”) and check the search analytics monthly for zero-result queries — each one is a merchandising gap.
7. Urgency and scarcity — mostly don’t
This category increases sales in the short term and erodes trust in the long term, so the honest recommendation is: no app. Real deadlines (a drop, a restock date, an end-of-season clearance) convert fine using your theme’s announcement bar and countdown sections. Fake “ends in 2:43:11” timers that reset every visit get pattern-matched as fake by experienced shoppers — we’ve written about this in our one-product themes guide. If the urgency is real, your theme already has the tools; if it isn’t, an app won’t save it. (This is also why velocity-based markdowns beat permanent “sales” — the discount is real, and it ends when the product sells.)
8. Support and chat
Free pick: Shopify Inbox (Shopify’s own app, free)
A pre-purchase question answered in two minutes is a sale; the same question answered tomorrow is an abandoned cart. Shopify Inbox is free, shows shoppers’ cart contents alongside the conversation, and covers most stores’ chat needs without a third-party widget’s script weight. Pair it with a genuinely good on-page FAQ — the objection-handling layer that answers questions before they’re asked.
9. The uninstall — the app that increases sales by leaving
The cheapest conversion win on this list: a quarterly app audit. Uninstall anything you haven’t actively configured in 90 days, anything duplicating a native theme feature, and anything whose lift you can’t name. Fewer scripts, faster pages, cleaner design — Google confirms Core Web Vitals are used by its ranking systems, so the uninstall pays twice: once in conversion, once in traffic.
The free stack: increasing sales on $0/month
If you’re bootstrapping, this stack covers every job above without a single app fee:
- Judge.me free plan — review collection and display
- Shopify Email — campaigns and abandoned-cart flows
- Auto Markdown free plan — velocity markdowns on your 50 slowest products, 2 rules
- Shopify Subscriptions — subscribe-and-save on consumables
- Shopify Search & Discovery — synonyms, filters, boosts
- Shopify Inbox — pre-purchase chat
Upsell engines and paid email tiers can wait until the data says you need them. What can’t be free is the foundation the apps sit on: a fast, conversion-built theme. That’s the one place where paying once beats paying monthly — the full argument is in the buyer’s guide.
Frequently asked questions
What are the best free Shopify apps to increase sales?
Start with Shopify’s own free apps — Email, Inbox, Search & Discovery, and Subscriptions — plus Judge.me’s free plan for reviews and Auto Markdown’s free plan for clearing slow inventory (50 tracked products, 2 rules). That stack covers reviews, email recovery, chat, search, subscriptions, and markdown pricing at $0/month.
How many apps should a Shopify store install?
As few as cover your revenue jobs — for most stores that’s four to six. Past that, each app adds script weight that costs page speed, and Deloitte’s research with Google put numbers on the cost: 0.1 seconds of mobile speed was worth 8.4% in retail conversions. Audit quarterly and uninstall anything whose lift you can’t name.
Do Shopify apps slow down your store?
Most add JavaScript that loads on every page, so yes — cumulatively. Prefer apps built as Online Store 2.0 app blocks (they render inside the theme’s layout), avoid duplicating features your theme ships natively, and re-run PageSpeed Insights after each install so you know what each app actually costs.
What’s the best Shopify app for automatic price drops?
Auto Markdown (built by our sister brand Palm Beach Themes) drops prices based on days without a sale rather than calendar dates, with floor-price protection so nothing sells below your margin and automatic restoration of the original price once the product sells. Plans run from a free tier to $39/month.
Do discount and markdown apps hurt your margins?
Blanket discounts do — they give margin away on products that would have sold at full price. Rules-based markdowns avoid that by only touching products that have stopped selling, and a floor price (set by cost, percentage, or fixed amount) caps how far any price can fall. The margin risk isn’t the markdown; it’s carrying dead inventory at full price forever.
The short version
Increase sales with the fewest apps that cover the jobs: Judge.me for proof, Klaviyo or Shopify Email for recovery, your theme’s cart drawer before any upsell engine, Auto Markdown for inventory that stopped moving, Shopify’s free apps for search, chat, and subscriptions — all sitting on a theme fast enough that the stack doesn’t cost you the conversions it was installed to win. Browse the seven themes we build for exactly that foundation.