Lumos, the free AI assistant inside the Discounty app, turns a one-sentence description of a Shopify sale into a draft campaign, and nothing goes live until the merchant checks it and presses Save. That review step is the point: anything that changes prices should wait for a human.
The useful question about an AI that sets up your sale is not how fast it drafts. It is what happens between the draft and your customers seeing a new price.
Disclosure: this article is part of a paid content partnership between eCommerce Fastlane and Discounty.
The approval step matters more than the drafting speed, because a sale is one of the few store changes that hits revenue the moment it goes live. A product description with a typo costs you a little credibility. A 25% discount applied to the wrong collection on the Thursday before Black Friday costs you margin on every order until someone notices, in the one week of the year when order volume is highest.
Shopify says this plainly in its own guidance on its AI tools. The best practices page for Shopify’s AI-powered tools tells merchants to review generated content before approving changes to the store, notes that the tools can make mistakes, and points out that the same request will not always produce identical results. It also makes the merchant responsible for any change they accept. That is not a knock on AI. It is an honest description of how language models behave, from the company that ships one inside every Shopify admin.
So the design question for any AI promotions tool is where it stops. A tool that hears “25% off winter until Sunday” and immediately changes prices is betting that it understood you. A tool that hears the same sentence, fills in the form, and waits for you is betting that you will catch what it got wrong. The second bet is the better one when the change is a price, because you know things the model does not: which products are already at thin margin, which new arrivals you promised would stay full price, and what “Sunday” means for a store whose customers sit in three time zones.
This is the frame for looking at Lumos. It is not interesting because it uses AI; most promotions apps will have an assistant within a year. It is interesting because it was built to stop at the draft, which happens to be the right place for a tool that touches prices. If you have read eCommerce Fastlane’s guide to protecting your Shopify store before BFCM, the logic is the same one behind keeping a working undo button: assume a change will eventually go wrong, and design the workflow so it is caught before customers see it.
Lumos is an AI assistant built into Discounty, a Shopify app for running sales and discounts, and it fills in Discounty’s campaign form from a plain-language description. You type something like “25% off the winter collection, not the new arrivals, until Sunday,” and Lumos drafts the campaign with the products, the discount, and the dates set. You review the draft and press Save. Nothing goes live on its own.
Discounty itself covers the sale types most stores mix during a big promotion: bulk price edits on a collection, quantity breaks, cart goals, Buy X get Y, shipping discounts, and discount codes, with scheduling so a campaign starts and ends without anyone switching it on by hand. It shows offers on the storefront through quantity tables, countdowns, and cart progress bars. The app is Built for Shopify, Discounty says it is used by more than 20,000 stores, and it is rated 4.9 from more than 1,250 reviews on the Shopify App Store. The full Discounty review on eCommerce Fastlane covers the app’s campaign types, setup, and limits in detail; this piece stays on Lumos and the approval question.
Two details about Lumos matter for small teams. It is free on every plan, including the free Starter plan, so trying it costs nothing beyond time. And it works in the merchant’s own language, which matters more than it sounds for the many Shopify operators who think about their promotions in a language other than English and then have to translate that thinking into an English admin form.
Pricing, as of November 2026: the Starter plan is free; Lite is $9.90 a month, Essential $29.90, Discounty $49.90, and Ultimate $145, with annual options. Every paid plan has a 3-day free trial. Fastlane readers can use the code FASTLANE for 90% off the first month on the Lite, Essential or Discounty plan, after which the regular price applies. The code does not apply to the Ultimate plan and is valid until 31 December 2026.
Describing a sale works best as a fast first draft that you then check line by line, and the check is where the real work happens. Lumos does three things: it turns a one-sentence request into a filled campaign form, it waits for you to review and save, and it answers questions about the campaigns already running in your store. That third capability is underrated. “Which of my campaigns end this weekend?” or “Is anything still discounting the summer collection?” are the questions that catch a stale promotion before it overlaps a new one.
Here is a worked example using the request Discounty itself uses to describe Lumos. It is illustrative, not a test result. The merchant types: “25% off the winter collection, not the new arrivals, until Sunday.” A good draft should come back with the winter collection as the target, the new arrivals excluded, 25% as the discount, and an end time on Sunday. Each of those four pieces is a decision the model made on your behalf, and each is worth a look.
Start with scope. “The winter collection” is clear to you, but a store can have a manual winter collection, an automated one built on tags, and a winter landing page that pulls from both. Confirm the draft points at the collection you mean and that the product count looks right. Then the exclusion: if your new arrivals are defined by a tag or a date rather than a collection, check that the draft actually removed them rather than ignoring the instruction it could not map. Then the end time: “until Sunday” could mean the start of Sunday or the end of it, in your store’s time zone, which may not match where most of your customers are.
Then the part no assistant controls: how this campaign interacts with everything else running. That is the subject of the next section, and it is the reason the Save button should be pressed by a person who knows the rest of the calendar.
Before saving any AI-drafted campaign, check it against Shopify’s own discount rules, because those rules decide what actually happens at checkout regardless of what the draft says. Shopify’s discount combinations documentation sets the boundaries every app works inside, and a few of them catch stores out during big sales.
First, combinations are opt in on both sides. A product discount and an order discount only stack if each one’s Combinations setting allows the other’s class, and two shipping discounts never combine. If your 25% winter markdown should also qualify for your free shipping threshold, both campaigns need to allow it. Second, Shopify caps a store at 25 active automatic discounts, and that count includes discounts created by apps. A busy BFCM calendar with quantity breaks, gifts, and per-collection markdowns can reach that ceiling faster than you would expect, so ask Lumos what is already running before you add more. Third, on plans below Shopify Plus, products in an active Buy X get Y discount cannot receive other product discounts, which matters if your winter collection overlaps a BOGO you set up last week.
There is one Discounty-specific check as well. If you sell internationally with Shopify Markets and a product has a fixed price set in a market, that fixed price wins in that market over a bulk price edit. Discounty’s documented fix is to switch that market to a percentage price adjustment or reset the price in the market’s catalog. An assistant drafting the campaign will not know which of your markets carry fixed prices unless you tell it.
Put together, the five-point check is short enough to run every time: right products in scope, exclusions actually applied, end time in the right time zone, combinations set the way you intend, and no collision with the 25-discount cap or a Buy X get Y on the same products. It takes a few minutes. Skipping it is how a one-sentence setup turns into a long Saturday.
Lumos is the wrong tool if you want an AI that runs promotions end to end, because by design it drafts and stops; it also works only inside Discounty’s own campaign types and cannot change Shopify’s limits. That is the honest boundary, and it cuts both ways. The approval step that protects your margin also means you still need someone who understands the promotion calendar. Lumos saves form-filling time. It does not save you from deciding whether a 25% markdown is a good idea for your margins, and it does not know your cost of goods unless you work that out yourself.
It also cannot see past the request you give it. If you forget to mention the new arrivals, the draft will not exclude them. If your winter collection includes a product that is already on a separate quantity break, the draft will not warn you about the overlap unless you ask. Answering questions about running campaigns helps, but only when the merchant thinks to ask.
The main alternative is already in your admin. Shopify Sidekick, Shopify’s own assistant, is built into the Shopify admin and works with your store data, presenting changes for your review before applying them, according to Shopify’s Sidekick help page. If your promotions are simple native discount codes and automatic discounts, Sidekick plus the native discount admin may be all you need, with no app to install. The trade off is coverage: Shopify’s native discounts do not give you storefront quantity tables, cart progress bars, or scheduled bulk price edits across a collection, which is the gap Discounty exists to fill. eCommerce Fastlane’s comparison of Shopify Magic and Sidekick covers what the native tools do well.
Choose Lumos inside Discounty if you run several kinds of sale across the year, want them managed and displayed from one place, and want the drafting help at no extra cost. Choose Sidekick and the native admin if your promotions are a handful of codes and automatic discounts and you would rather not add an app. Choose a developer-built approach with Shopify Functions if you are on Plus with unusual stacking rules that no off-the-shelf app models well. Other discount and bundle apps on the Shopify App Store cover overlapping ground, so if you already run one that works, adding a second promotions app in BFCM week is more likely to create conflicts than save time.
This week, draft one real Black Friday campaign with whatever assistant you have, then run the five-point check on it before saving, and time how long the check takes. That single exercise tells you whether describe-it setup saves you time or just moves the work. If the check finds nothing, you have a fast workflow. If it finds a wrong scope or a missed exclusion, you have learned that before it cost an order.
If you are under roughly $500K a year and set up promotions yourself, start with the free tools: try Lumos on Discounty’s Starter plan or Sidekick in your admin, and keep the number of overlapping campaigns small enough that you can hold the whole calendar in your head. If you are between $500K and $2M with several overlapping offers, the questions-about-running-campaigns side of Lumos is the more valuable half, because the risk at that stage is collisions between campaigns rather than slow setup. Ask it what is live before you add anything new, and write down which campaigns are allowed to combine before BFCM week rather than during it.
Whatever you use, keep the human on the Save button. An assistant that drafts your sale in ten seconds is genuinely useful. One that publishes it without asking is a liability in the busiest week of the year, and Lumos was built on the right side of that line.
No, Lumos cannot put a campaign live without your approval, because it only fills in Discounty’s campaign form and waits for you to check the draft and press Save. That design is deliberate. Shopify’s own guidance on its AI tools says AI can make mistakes and that merchants should review generated changes before accepting them, and a draft-then-approve flow builds that review into the workflow. The practical habit is to treat every draft as a proposal: confirm the products in scope, any exclusions, the end time, and the combination settings before saving. Once saved, the campaign runs on the schedule you approved, so the review moment is the one that counts.
Lumos is free on every Discounty plan, including the free Starter plan, so you can try it without paying. As of November 2026, Discounty’s paid plans are Lite at $9.90 a month, Essential at $29.90, Discounty at $49.90 and Ultimate at $145, each paid plan with a 3-day free trial. The paid plans unlock more campaign types and limits, so the plan you need depends on the promotions you run rather than on Lumos. Fastlane readers can use the code FASTLANE for 90% off the first month on the Lite, Essential or Discounty plan until 31 December 2026; it does not apply to Ultimate, and the regular price applies after the first month.
The main difference is scope: Sidekick is Shopify’s general admin assistant that works with native features, while Lumos drafts campaigns only inside Discounty’s own sale types. Sidekick is built into the Shopify admin and suits stores whose promotions are native discount codes and automatic discounts. Lumos suits stores already using Discounty for things the native admin does not offer, such as scheduled bulk price edits across a collection, storefront quantity tables, countdowns and cart progress bars. Both present work for review before it applies, so the approval habit is the same either way. If you run only a few simple codes, Sidekick and the native admin are likely enough on their own.
Shopify discounts usually stop stacking because each discount’s Combinations setting must allow the other discount’s class, and both sides have to permit it. Two shipping discounts never combine, and on plans below Shopify Plus, products in an active Buy X get Y discount cannot also receive other product discounts. A store can also hit Shopify’s cap of 25 active automatic discounts, which counts discounts created by apps, so a busy BFCM calendar can quietly block new campaigns. Check the Combinations settings on each active discount, count what is live, and look for Buy X get Y offers on the same products. These rules apply whether a campaign was set up by hand, by an app, or by an AI assistant.
An AI discount assistant can draft campaigns for international stores, but it cannot override fixed prices you have set in Shopify Markets, so you need to check those yourself. In Discounty’s case, a fixed price on a product in a specific market wins over a bulk price edit in that market. Discounty’s documented fix is to switch that market to a percentage price adjustment, or reset the price in the market’s catalog, so the sale price comes through. Because the assistant only knows what you tell it, list which markets carry fixed prices before drafting, and preview the campaign in each market before Black Friday rather than during it.
