Can AI build a grocery list app like AnyList?

Build a personal grocery list web app to replace AnyList Complete for my own use. I shop alone.

Tech rules:
- Plain HTML, CSS, and vanilla JavaScript in one file, plus a small service-worker.js so it opens offline in the store. No framework, build step, account, or server.
- Store all data in localStorage under one key, with a version number.

Data model:
- Item: id, name, quantity (text, optional), category, checked, priceCents (optional), storeIds [], addedAt.
- Category: id, name (Produce, Dairy, Bakery, Meat, Frozen, Pantry, Household, Other).
- Store: id, name, categoryOrder [categoryId].
- Staple: name, category, defaultQuantity.

Features:
- Quick-add box that guesses the category from past items and a built-in word list (for example "milk" to Dairy). I can change it with one tap, and the app remembers.
- Pick the store I'm shopping at. The list reorders by that store's aisle order.
- Tap to check off. Checked items move to a collapsed "In cart" section. "Clear checked" removes them.
- Staples screen: tap staples to add them to the list.
- Recent items: last 30 unique items for one-tap re-adding.
- Optional price per item and a running total for unchecked and checked items.
- Keep the screen awake while the list is open, using the Screen Wake Lock API when available.

Edge cases the build must handle correctly:
1. Adding "milk" when "milk" is already on the list increases quantity or asks, instead of creating a duplicate. Matching ignores case, plurals ending in s, and leading quantities like "2 x" or "2".
2. Quantities stay text ("2 kg", "a few"), never forced into numbers.
3. An item with an unknown category goes to Other, not to the top of the list.
4. Unchecking an item returns it to its aisle position.
5. Deleting a category moves its items to Other.
6. The list opens and works in airplane mode after one online visit.
7. Store prices in integer cents.

Backup:
- One-click "Export JSON" and "Copy list as text" (grouped by aisle, for pasting into a message).
- "Import JSON" restores after confirmation.
- "Paste list" imports a plain-text list, one item per line, so I can move items from AnyList or my notes app.

Layout:
- Mobile-first, large tap targets for one-handed use with a basket, readable at 375px wide, high contrast.

Exclusions:
- No publishing, App Store submission, accounts, sharing, sync, payments, recipes, meal planning, or social features.

Write a short README explaining where data is stored, how to export and restore it, and how to host it so it works offline.

Keep it under 600 lines. This is a personal tool, not a product.

What is the short answer?

Yes, but. AI can build a grocery list app that replaces AnyList Complete at $9.99 per year for one person or $14.99 per year for a household in 1–2 hours. It’s one of the easiest builds on this site.

The “but” is money and sharing. AnyList’s free version already shares and syncs lists between phones, and Complete costs less than $1.25 per month even for a household. A local web app can’t sync with your partner’s phone. For most households, building saves almost nothing and loses the one feature that matters. Build it if you shop alone and want your list to work exactly like your store.

Option	Best for	Upfront cost	Ongoing cost	Main limitation
Build a rough prototype	Solo shoppers who want an aisle-sorted list for one store	$0 and 1–2 hours	$0	No offline loading or duplicate merging yet
Build a daily-use personal version	Solo shoppers who want custom aisle order for several stores and offline use	$0 and 4–6 hours	$0	Only works on your phone; no shared list
Keep paying for AnyList Complete	Households that share one live list, recipes, and meal plans	$0	$9.99/yr individual or $14.99/yr household	Features you don’t use still cost $10–$15 a year

The ready-to-paste starter prompt at the end of this page builds the daily-use version.

What should the first version include?

The first version needs to be faster than a paper list in the supermarket. That means aisle order and one-tap staples.

• Quick-add with automatic aisle category
• Aisle order for each store you shop at
• Check off, uncheck, and clear checked
• A staples list and recent items for one-tap re-adding
• Optional prices with a running total
• Offline loading in the store
• Deliberate exclusion: no sharing, no recipes, no meal planning. For recipes, use the Paprika build.

What can AI build reliably?

ChatGPT and Claude build grocery lists reliably on the first prompt. The data is a list of names with categories, and thousands of examples exist.

Concrete things AI gets right:

• Aisle-sorted lists that reorder when you switch stores
• Checked items sliding into a collapsed “In cart” section
• A staples screen for weekly basics
• A running total in cents that doesn’t drift
• Keeping the screen awake while you shop, where the browser supports it

Where will AI need human help?

Duplicates need your testing. “Milk”, “milk”, “2 milk”, and “Milk x2” should all land on one line. AI’s first version usually creates 4 lines. The starter prompt specifies the matching rules, but check with your own habits, like typing “eggs” when “egg” is already there.

Offline loading needs your setup. The app must be hosted on a free static host and opened once online, so your phone caches it. Test in airplane mode at home before you trust it in a basement supermarket.

The decision only you can make is whether sharing matters. If your partner adds items during the week, a personal web app fails at its main job. That’s a reason to keep AnyList, not a bug to fix.

Privacy barely applies. It’s a grocery list. Still, it stays on your phone with no account.

Can I get my data out of AnyList?

Partly, and it doesn’t matter much. AnyList doesn’t clearly document a bulk export for shopping lists [VERIFY in the app’s settings or help center]. Most lists are short-lived, so the only data worth moving is your staples.

The practical path: open your AnyList staples or favorites, retype or paste them as plain text, and use the starter prompt’s “Paste list” import. That takes about 15 minutes for 30 items.

If you also keep recipes and meal plans in AnyList, those are the harder data to move. Check AnyList’s help center for recipe sharing or export options [VERIFY], or move recipes into a recipe manager build one at a time.

How long will it take and what will it cost?

Rough prototype: 1–2 hours and $0. An aisle-sorted list with check-off and staples.

Dependable daily-use version: 4–6 hours, including duplicate merging, several stores, prices, and offline loading. Build it on a free AI plan.

This is where the math turns. AnyList Complete costs $9.99 per year. A $20 month of a paid AI plan equals 2 years of AnyList for one person. Build only on a free plan, or build because you want features AnyList doesn’t have, not to save money.

These are estimates from reviewing the feature set, not measurements from a completed build.

Which AI tool or approach should I use?

Claude or ChatGPT on a free plan is enough. This build fits comfortably in one conversation.

Claude is handy for previewing tap targets and colors in the chat.

Cursor is unnecessary here. The app stays small.

Lovable makes shared lists possible with a hosted database. If sharing is the goal, that’s the realistic route, but then you’re maintaining a hosted app to replace a $14.99 subscription.

What will I need to maintain?

Almost nothing. Two files on a free static host.

Recurring work:

• Export a JSON backup every few months, mainly for staples and store layouts
• Update aisle order when your store rearranges
• Open the app online occasionally so the cached version stays current

Should I build it, buy it, or reduce scope?

Build it if you shop alone, want exact aisle order for your stores, and enjoy tuning your own tools.

Buy it if you share lists with anyone in your household. AnyList’s free sync is better than anything a personal build offers, and $14.99 per year for a household is a fair price for recipes and meal plans on top.

Reduce scope if you only need a checklist. Your phone’s built-in notes or reminders app already does that for free.

Recommendation: keep AnyList if you share a list with anyone, even on the free tier. This subscription isn’t worth replacing for money. Build your own only as a solo shopper who wants a tool shaped around your store. If you’re tracking what you eat rather than what you buy, see the calorie tracker build, and log grocery spending in the YNAB-style budget.

What if I wanted to ship this to other people?

Shipping a grocery app means shared real-time lists, accounts, sync conflicts when 2 people check the same item, and competing with strong free apps. It’s a crowded, low-price market and a much bigger project than the personal list.

Starter build specification

• User: You, for your own use, shopping alone.
• Problem: Paying $9.99 per year for AnyList Complete when you want an aisle-sorted list for your own stores.
• Core workflow: Add items during the week, pick the store, walk the aisles in order, check items off.
• Required features: Quick-add with categories, per-store aisle order, staples, recent items, duplicate merging, prices, offline loading.
• Deliberate exclusions: No accounts, no sharing, no recipes, no store submission.
• Data ownership: Stored in localStorage. Exported as JSON and text. Imported from JSON or pasted text.
• Definition of done: In airplane mode, the list opens, sorts by your store’s aisles, and adding “2 milk” when “milk” exists results in one line.

For scoping help, read can AI build an app for me.

Sources and verification

• AnyList Complete (AnyList): $9.99 per year individual and $14.99 per year household.
• AnyList on the App Store: in-app subscription prices.
• Appy Hour: AnyList (Fade to White): free mobile app with sharing and sync, and the features Complete adds.

This app was not built and tested for this page. The verdict is based on AnyList’s official pricing, third-party reviews, and a review of the feature set. AnyList’s price was checked on September 24, 2026.

Reviewed on September 24, 2026.