HueFill: Rainbow & Gradient Text for Google Docs™ — Privacy Policy

Last updated: 10 November 2026

HueFill is an add-on for Google Docs™ that colours the text you select: a rainbow, a gradient of your own colours, or your colours in turn. This policy says what it does with data, including the Google user data it receives.

What Google user data HueFill accesses

• The document you use it in (scope documents.currentonly). HueFill reads the text you select, to find its letters and words, and sets their text or highlight colour and, if you ask for growing letters, their font size. Remove colours sets the selection’s text and highlight colours back to the defaults. It has no access to your other documents or files.
• Your email address (scope userinfo.email). It is how your purchase is found: HueFill looks up the Stripe customer with this email and, when you start a checkout, creates one. It is also shown in HueFill so you can check which Google account is used for your free colourings and purchase. Google’s installation screen may also say the add-on can ‘associate you with your personal info on Google’. That is Google’s standard sign-in association; HueFill does not request, read or store your profile information.
• Sidebars and menus (scope script.container.ui), to show HueFill inside Docs™.
• Connections to outside services (scope script.external_request), to exactly one: Stripe (api.stripe.com), to check purchases and sell the one-time unlock.

How HueFill uses that data

• Your text is read and coloured inside Google’s Apps Script. The preview in the sidebar shows a sample sentence, not your text. Your text is not stored, and not sent anywhere else.
• Your settings (your purchase status and your Stripe customer number) are kept in your own Google account’s storage for the add-on, with a mark that the deletion described under CaptionFill below has been done.
• Free allowance records, in the same account storage, keep how many of your free colourings are spent. The latest one adds a random identifier, a one-way fingerprint made from the document’s ID and a random value, its status and its number of letters, so that a retry is not counted twice. No document text is stored in these records.
• A count of your runs: once HueFill is on the Marketplace, your account storage counts your colourings, so that after a few it can ask you, once, whether you would review it. It is used for nothing else.
• CaptionFill: HueFill takes the place of CaptionFill on the same Google Workspace Marketplace listing. The first time HueFill opens for your account, everything CaptionFill kept in your account’s storage is deleted: its free allowance records, its count of your runs and its billing cache.
• Payments are made on Stripe’s checkout page. Stripe receives your email, card and billing address; HueFill never sees your card. We can see in Stripe your email, your billing country and your purchase, which we need to provide the service and to account for tax. Stripe’s Privacy Policy applies.

HueFill uses Google user data only for the features above. It does not sell or rent it, does not use it for advertising, and passes it to no one except as those features need: your email to Stripe. HueFill has no servers of its own. The contents of your documents are never sent to us or to anyone else. HueFill uses no analytics service; it counts in its own error log how many accounts reach each usage step described below.

HueFill does not use Google user data, including data received from Google Workspace™ APIs, to develop, improve or train AI or machine-learning models, generalized or personalized.

HueFill’s use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.

Who HueFill shares Google user data with

• Stripe (our payment processor, Privacy Policy) receives your email address, to find your purchase and, when you buy, to create your customer record and take the payment. Stripe receives nothing else of your Google user data: no document content.
• Your document never leaves Google’s services.

Nothing else is shared, transferred or disclosed: HueFill does not sell, rent or trade Google user data, and does not give it to advertisers, data brokers, analytics providers or any other third party. We would disclose it only if the law required us to, and only what it required.

How HueFill protects that data

• Encryption in transit. Everything HueFill sends or receives travels over HTTPS (TLS): between your browser and Google, and from Apps Script to Stripe.
• Encryption at rest. Your document, HueFill’s settings and its error log are stored by Google, which encrypts the data it stores. Your customer record is stored by Stripe, which encrypts it too.
• Access controls. HueFill runs inside Google’s Apps Script, as you, with only the scopes above and only in the document you open it in. We have no access to your documents or to your settings. Your customer record sits in our Stripe account, which only we can sign in to. HueFill reaches Stripe with a restricted key that stays on Google’s servers and never reaches your browser.
• Never stored: the contents of your document outside it, your card details, and your Google password or sign-in tokens.
• Errors: when something fails, its error message (such as a Stripe error) goes to HueFill’s error log in Google Cloud™, which only we can read.
• Usage steps: each of these steps adds one line to the same error log, naming only HueFill and the step: the sidebar opens, it opens on the Pro offer, Unlock Pro is chosen, text is coloured, a colouring stops at the free allowance. The line holds no document content, colour, email address or file name. Google adds to every line in the log its own key for the account, which does not name you, is used only by HueFill and changes every 30 days. We use it only to count how many accounts reach each step, and never link it to payments, email addresses or other records.

Keeping and deleting

• The error log, usage steps included, is deleted after 30 days.
• The colours and sizes HueFill set are part of the document and stay until you change them or delete the document.
• Free allowance records have no automatic expiry; the next counted colouring replaces the latest one’s record without resetting the count used.
• Your settings and free allowance records stay in your Google account’s storage for HueFill and contain no document text. Uninstalling HueFill (Extensions > Add-ons > Manage add-ons) stops it; removing it at https://myaccount.google.com/connections also ends its access to your account, after which nothing reads them.
• To have your data at Stripe deleted, write to us and we delete your Stripe customer. The records of your payments are kept for five years after the end of the financial year they belong to, as Danish bookkeeping law requires, and deleted after that.

Contact

Questions about this policy or your data: spyridwn.pd@gmail.com.