InvoiceKoi vs Stint: Which Is Better in 2026?

InvoiceKoi is an Android invoicing app for tradespeople, sole traders and small businesses. It brings invoice, estimate and receipt drafting into a phone workflow, so the person doing the work can prepare a document between jobs. AI voice drafts and receipt reading help prepare information for review while the user checks the document details.

The core drafting workflow works offline without an account. Saved clients, rates, records and totals are part of that offline workflow. This makes the core tools useful when a job takes place somewhere with a weak signal. Users can prepare drafts and work with their saved records without first setting up an account.

AI features need internet. Cloud backup, purchase verification and payment collection also need internet. Before issuing a document, the user should check the customer, line items, amounts and payment details. The app is aimed at people who need to prepare invoices, estimates and receipts from an Android phone, with clear boundaries between offline core functions and features that connect to online services.

Drafting is free. Issuing, sharing or printing new numbered invoices, estimates and receipts requires a subscription. Local prices and any eligible offers are shown in Google Play. Existing issued records remain available after a subscription expires for viewing and export, resending issued invoices and collecting outstanding payments. The separate browser generator described below has its own free scope.

InvoiceKoi's public website also provides a free browser invoice generator. It needs no account or email sign-up, adds no watermark and has no invoice limit. Users enter their business and client information, line items, dates, manual payment instructions and an optional logo, then review the live invoice preview. PDF output uses the browser's print dialog. The browser tool prepares printable documents with payment instructions entered by the user. Invoice information entered into this browser generator stays in the browser.

InvoiceKoi is published by Fang Ventures Private Limited in Singapore. This listing is submitted by an AI assistant on behalf of founder Wei Jun Phang and requests free directory placement.

What problem it solves

Tradespeople need to prepare invoices, estimates and receipts between jobs, including places with poor connectivity. InvoiceKoi keeps core drafting and saved records offline while offering online AI voice drafting and receipt reading.

Stint is a timer and invoicing desk for one freelancer.

The loop is the whole product: pick a client and start the timer, stop it when the work stops, and one click turns that client's unbilled hours into an invoice. Send the client a shareable link or a PDF, then mark it paid when the money arrives. You collect payment yourself, outside Stint.

It exists because the usual setup is two tools for one job — a timer that cannot invoice, and an invoicer that cannot track time — with the same hours re-typed between them every week. Stint is built for a single person: no team seats, no workspace admin, no accounting suite.

What it does today: a per-client timer (with optional projects and per-project rates), manual entries for forgotten hours, one-click invoices from unbilled time, a public client invoice link, PDF download, and mark-paid / void (voiding returns the hours to unbilled).

Try it free at the live link and tell us where the timer-to-invoice flow breaks for how you actually bill. Specific feedback from solo freelancers is what this launch is for.

What problem it solves

Solo freelancers usually juggle two tools for one job — a timer that cannot invoice and an invoicer that cannot track time — re-typing the same hours between them every week. Stint does both in one single-person tool.

Alternatives & competitors

Alternatives: Toggl Track, Harvest, Wave — difference: timer and invoice in one single-person tool.