The short version
- Installing the app, setting up your business and writing drafts is free. Issuing an invoice, estimate or receipt needs an active Koi Pro subscription or eligible store trial for new customers. Existing customers keep their promised core document access. Core invoicing works without an account or a signal.
- Koi Pro also adds photograph backup, the AI reading features, priority support and a lower payment collection fee.
- Payments collected through InvoiceKoi carry a Koi fee of 0.7% plus 0.10 in the payment currency (for example US$0.10, £0.10 or S$0.10) without an active subscription, or 0.35% with one, plus Stripe processing fees. Zero-decimal currencies have no fixed part. These fees are deducted from the payment, not added to the amount your customer pays. Manually recorded cash, bank transfers and other payments have no Koi fee.
- It renews by itself until you cancel it, and you cancel it in the App Store, not here, and not by emailing us.
- Your books are yours. We do not sell them, mine them, or train anything on them.
- The app helps you write an invoice. It is not an accountant, and the numbers on a document you send are your responsibility.
Using the app
You may use Invoice Koi to run your own business, on devices you control, for as long as you like. You may not resell it, pass it off as your own, or take it apart in order to do either.
You are responsible for what you send with it. An invoice produced by this app is a document you have written and chosen to send: the amounts, the tax treatment, the terms and the client's details are yours to check. The app does arithmetic on what you type; it does not know what you are allowed to charge or what your jurisdiction requires of an invoice.
Koi Pro
Koi Pro is an auto-renewing subscription sold through the App Store. It is offered on two solo terms: US$99.99 billed yearly or US$9.99 billed weekly in the US App Store, checked 3 October 2026. Both include the same solo features. Crew plans add seats and are priced separately in the app. Prices and offers vary by country and store. The price for each is shown on the subscription screen in the app before you buy, in your own currency and for your own storefront. That screen is the authority on price; any figure written elsewhere may be out of date.
What it includes:
- Issuing new invoices, estimates and receipts, with no count on them.
- Your receipt photographs and job pictures carried to your account and back, so that losing or replacing the phone does not lose them.
- Use of the reading features (receipts, photographs, documents, spoken notes and Ask Koi) without a daily allowance.
- A lower Koi payment collection fee: 0.35% instead of 0.7% + 0.10, with Stripe processing fees additional.
- Priority support, ahead of the general queue.
The subscription screen shows the price and billing period before purchase. Payment collection requires an account and Stripe setup. A paid workspace verified by our server receives the lower rate. Preserved core document access alone does not qualify for the lower rate or paid AI, photo backup or crew seats. Existing open payment links keep the fee quoted when they were created.
Free trials
Eligible new iOS subscribers may get two weeks free on the annual plan or one week free on the weekly plan. Offers vary by country and store. Nothing starts until you confirm the purchase. Where a trial is offered, its length is shown on the subscription screen before you buy and nothing is charged until it ends. Apple decides who is eligible: a trial is generally offered once per Apple ID per subscription group, so if you have had one before you will be charged from the first day. The app shows the trial only when Apple confirms you can still have it.
If you cancel before the trial ends, you are not charged.
Renewal and cancellation
The subscription renews automatically at the end of each period, and your Apple ID is charged for the next one, until you cancel. To cancel, open Settings › your name › Subscriptions on your device, or the Manage link on the subscription screen in the app, and turn off automatic renewal at least 24 hours before the period ends. Cancelling stops future charges; it does not refund the period you are in.
Deleting the app does not cancel the subscription.
Refunds
Apple takes the payment, so Apple handles refunds. Request one at reportaproblem.apple.com. We cannot issue a refund for a purchase we did not process, though if something in the app went wrong we would like to hear about it either way. See Support.
If you stop paying
Your books stay. They are stored on the device and they are not held hostage: you can still view and export your records, resend invoices already issued, and record or collect payments still owed. Issuing new invoices, estimates and receipts needs an active subscription or eligible store trial again for customers on the subscription offer. Existing customers keep their promised core document access, and nothing is deleted because a subscription ends. What was already backed up stays in your account and can still be restored, and you can take a full portable copy out of the app at any time, on any plan, from Settings › Import and export.
Your account and your data
An account is optional and exists so the books survive the phone. What is kept, where, and for how long is set out in the privacy policy, which is part of these terms.
You can delete your account and everything in it from inside the app, at Settings › Account. That deletes the copy on the server; the books on your phone are untouched.
Things read by the model
When you ask Koi to read a photograph, a document or a spoken note, that content is sent to a third-party model provider to be read and the result comes back. It happens only when you press a button that says so. It is described in full in the privacy policy.
What comes back is a machine's reading and can be wrong. Check a total before you send it to a client.
Availability, and what we do not promise
The app is provided as it is. We do not promise it is free of defects, that the server side is never unavailable, or that it fits a particular purpose of yours. We especially do not promise that a reading by the model is accurate.
Nothing here excludes liability for death, personal injury, or fraud, or any other liability that cannot lawfully be excluded. Beyond that, and to the extent the law allows, our total liability to you for anything arising out of the app is limited to what you have paid us for it in the twelve months before the claim, which, for an account that has never subscribed, is nothing.
Keep your own copies of anything that matters. The app exports a complete portable backup, and taking one occasionally is the sensible habit with any software, this one included.
Ending it
You can stop using the app at any time, and delete your account from inside it. We may end your access if you use the app to break the law or to attack the service. And if we ever discontinue the app, we will say so far enough ahead that you can take your books out.
Changes
If these terms change, the date at the top changes and the current version is always at this address. A change that materially affects a live subscription will be notified in the app before it takes effect. Continuing to use the app after that is how you accept it; if you would rather not, cancel and export your books.
Who we are, and which law
Invoice Koi is published by Fang Ventures Private Limited, registered in Singapore. These terms are governed by Singapore law, and the courts of Singapore have jurisdiction, except that if you are a consumer elsewhere, nothing here takes away a right your own country's consumer law gives you.
Questions about any of this: support@invoicekoi.com.