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Invoice Koi
Estimate on site, invoice before you leave the job
Invoice Koi is now on iPhone and iPad. Write estimates on site, turn them into invoices, reuse your rates and scan receipts. Draft offline, then subscribe to send. Also available on Android. AI, backup and payments need a connection.
I built it for people who do the work and send the bill themselves: electricians, plumbers, builders and other independent trades. The iPhone and iPad app is now live, alongside Android.
Write an estimate on site and turn it into an invoice without retyping. Keep your own rates in a price book, scan receipts for review, and track time, expenses and payments in one set of books. Drafting works offline; AI, backup and payment collection need a connection.
Setting up and drafting are free. Sending, sharing or printing numbered documents requires a weekly or yearly subscription. Local prices and any eligible trial appear in your app store. Subscriptions renew unless cancelled.
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About Invoice Koi on Product Hunt
“Estimate on site, invoice before you leave the job”
Invoice Koi was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #237 on the daily leaderboard. Invoice Koi is now on iPhone and iPad. Write estimates on site, turn them into invoices, reuse your rates and scan receipts. Draft offline, then subscribe to send. Also available on Android. AI, backup and payments need a connection.
Invoice Koi was featured in iOS (111.1k followers) and Productivity (665.3k followers) on Product Hunt. Together, these topics include over 219.7k products, making this a competitive space to launch in.
Who hunted Invoice Koi?
Invoice Koi was hunted by P WJ. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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P WJ
Hi Product Hunt, I'm Jun, and I make Invoice Koi.
I built it for people who do the work and send the bill themselves: electricians, plumbers, builders and other independent trades. The iPhone and iPad app is now live, alongside Android.
Write an estimate on site and turn it into an invoice without retyping. Keep your own rates in a price book, scan receipts for review, and track time, expenses and payments in one set of books. Drafting works offline; AI, backup and payment collection need a connection.
Setting up and drafting are free. Sending, sharing or printing numbered documents requires a weekly or yearly subscription. Local prices and any eligible trial appear in your app store. Subscriptions renew unless cancelled.
If you only need one invoice, the website also has a free browser generator: https://www.invoicekoi.com/us/invoice-generator/
For anyone who invoices after a job: what part of the paperwork still follows you home?