Sparkfield
Sparkfield Privacy Policy
Effective October 26, 2026
Sparkfield is made by Happy Heart Software LLC.
What stays on your device
Your brainstorms (prompts, ideas, reactions, metrics and scores) are stored in your browser on this device. They’re never stored in an account, and we don’t receive or keep copies. Clearing your browser’s site data deletes them.
Your Happy Heart Plus key, if you add one, and your sign-in, if you sign in, are stored in your browser too.
Happy Heart Plus
Sparkfield’s AI features come from Happy Heart Plus (plus.happyheartsoftware.com), which handles your Plus, buying and AI requests under its own privacy policy. On the web, “Get Plus”, “Manage Plus” and “Add credits” open Plus’s pages.
You can use Plus with your Happy Heart Software account instead of a key. Signing in happens on accounts.happyheartsoftware.com, under its own privacy policy. Sparkfield receives your account ID and email address (to show who’s signed in) and a sign-in token, which it sends to Plus in place of a key. Signing out removes the sign-in from this browser and signs you out of the accounts service.
The Android app
Sparkfield’s Android app, from Google Play, has this site built in: your brainstorms stay on your phone, and it sends the same requests to Plus and accounts as the website does. Signing in opens in your phone’s browser and comes back to the app; signing out in the app removes the sign-in from the app only.
In the app, “Get Plus” buys Sparkfield Plus through Google Play: Google handles the payment under Google’s privacy policy, and the app sends Plus the purchase token Google gives it, with your sign-in, so Plus can check the purchase with Google and turn Sparkfield Plus on for your account. Each time the app starts while you’re signed in, it also sends Plus any Google Play purchase Plus hasn’t received yet. “Manage Plus” opens your Google Play subscriptions.
What is sent, and when
Only when you ask for ideas or Sparkfield scores them (after each round of ideas, when you add your own, and when you change the metrics), Sparkfield sends the request to Plus with your sign-in or your Plus key. The request holds the brainstorm’s prompt, its metrics, and the ideas needed to steer or score (the ones you liked, passed on, wrote, or haven’t reacted to yet). Plus gets an answer from an AI model and returns it to you, without keeping what you sent or got back.
What we don’t do
No analytics, advertising, tracking, cookies or third-party scripts in Sparkfield. Fonts and all other files load from Sparkfield’s own site, or come built into the Android app.
Contact
contact+sparkfield@happyheartsoftware.com
The news by email link opens the signup on our company blog (blog.happyheartsoftware.com), outside the app. If you sign up there and confirm, we receive your email address and use it only to email you new posts, at most once a month; the blog’s privacy policy covers it. Sparkfield itself sends nothing when you tap the link.