Should borrowers be able to pay deposits in the app?

No, and resisting this is what keeps the build to a week. Taking money means payment processing, disputes, refunds, and a very different regulatory conversation, all to solve a problem that a group of neighbours handles socially. Record a deposit note on the item, let the humans settle it, and stay a coordination tool.

What stops this from becoming a marketplace nobody uses?

The invite code. Open lending platforms fail on trust and liquidity — strangers will not lend a chainsaw, and an empty catalogue has no reason to be opened. A closed group already has trust and already has the items; the app only has to remember who has what. Keep it closed and it stays useful at ten members, which is where marketplaces are dead.

How to Build a Tool Library App with AI (2026)

What a tool library app needs

Catalogue of items with a photo, owner, condition, and deposit note
Borrow request with dates, and an accept or decline from the owner
Active loans with due dates and a one-tap return confirmation
Overdue reminders to the borrower, and a gentle nudge for the owner
Private group — you join by invite code, not by discovery

The screens

Screen	What it does
Catalogue	Searchable items with availability, owner, and a borrow button
Item Detail	Photos, condition notes, usage instructions, loan history
My Loans	What you have borrowed and what is out, with due dates
Requests	Incoming requests to accept or decline, with dates
Group	Members, invite code, group rules, add an item

The data model

Item: groupId, ownerId, name, category, photoUri, condition, instructions, depositNote, status
Loan: itemId, borrowerId, requestedFrom, requestedTo, status, collectedAt, returnedAt
Member: groupId, userId, displayName, joinedAt, role
Group: name, inviteCode, defaultLoanDays, rulesText

The build prompt (copy this)

Paste this into ShipNative and it becomes a working React Native app with these screens, navigable in a live preview, in about two minutes:

“A neighbourhood tool library app for a private group. People join a group with an invite code — there is no public discovery and no payments. Each member lists items they are willing to lend, with a photo, category, condition notes, usage instructions, and an optional deposit note. The Catalogue is searchable by name and category and shows whether each item is available or out, and until when. Borrowing is a request: the borrower picks dates, the owner gets it in a Requests screen and accepts or declines. An accepted request becomes a loan with a due date derived from the default loan length set for the group. My Loans shows what you have borrowed and what of yours is out, each with a due date and a one-tap confirmation for collection and return. Overdue loans send a reminder to the borrower and show the owner a nudge option that sends a polite prefilled message. Item detail shows loan history so a member can see how an item has been treated. Screens: Catalogue, Item Detail, My Loans, Requests, Group. Needs accounts and group membership, and a member must only see items in groups they belong to.”

Then iterate with small, screen-specific prompts (“make the primary button bigger”, “add an empty state”), preview on your own phone, and export the full Expo project whenever you want. The full method: how to build an app with AI.

How it makes money

Charge the group, not the member — roughly $5–10 per month per group above a free member limit, paid by whoever organises it. Community groups, makerspaces, and resident associations have small budgets but a real organiser who wants the problem gone. Keep small groups free permanently; they are how the next organiser finds you.

Implementation and the revenue math for every model: how to make money from an app. When you’re ready to ship: App Store and Google Play publishing guides.

Build it now

The prompt above is free to run at shipnative.dev — working tool library app on your phone today, full code export, no credit card.

How to Build a Tool Library App with AI