Privacy Policy

Effective: May 1, 2026 · Last updated: May 1, 2026

Worm Coil ("the app", "we") is built with privacy as a default. This page explains, in plain language, what happens to data while you use the app.

Short version: We don't collect any personal data ourselves. The app does include Google AdMob for occasional interstitial ads (between games) and optional rewarded ads (double coins / revival). AdMob may use your device's advertising identifier (IDFA) for ad personalization — we'll ask first via Apple's standard tracking prompt, and you can decline. Game Center and in-app purchases are handled directly by Apple. You can also remove all ads forever with a one-time in-app purchase.

What we don't do

We don't ask for or collect your name, email, phone number, or location.
We don't use third-party analytics. There is no Google Analytics, no Firebase, no Mixpanel.
We don't run servers. We have no database of users, scores, or activity. Worm Coil is single-player — every other "worm" you see in the arena is a bot running on your device.
We don't sell or share any data ourselves.
We don't show full-screen ads on app launch or while you're playing — only between matches, and only after roughly every third death.

What stays on your device

The following data is created and stored entirely on your device, in iOS's standard UserDefaults. It never leaves your phone or iPad:

Game progress — best worm length, longest endless run, total worms eaten, daily login streak
App preferences — sound on/off, haptics on/off, currently selected skin, currently selected map theme, difficulty
Coin balance and unlocked skins
Purchase status — which skin packs and "Remove Ads" upgrade you've bought (verified against Apple's receipts)
Achievement progress — which milestones you've earned locally (also synced to Game Center if signed in)

Uninstalling the app removes all of this. You can also reset stats at any time via Settings → Data → Reset Stats.

Advertising (Google AdMob)

The free tier of Worm Coil shows two kinds of ads via Google AdMob:

Rewarded ads — optional, opt-in. After a death, you may choose to watch a short ad in exchange for double coins or a one-time revival. You're never forced to watch.
Interstitial ads — full-screen ads that may appear briefly between matches (roughly every third death). Never during gameplay, never at app launch.

Google AdMob may use your device's advertising identifier (IDFA) to personalize ads if you grant permission via Apple's standard tracking prompt on first launch. If you decline (or if you're under 18 in some regions), ads will still appear but be non-personalized — which means they're less relevant, not absent.

What AdMob may collect when serving ads (per Google's own disclosure):

The device's advertising identifier (IDFA), only with your tracking consent
Crash and performance data for the SDK itself, never tied to your identity
The fact that an ad was served and viewed

Google's full advertising privacy policy lives at policies.google.com/technologies/ads. You can opt out of personalized advertising at the iOS level via Settings → Privacy & Security → Tracking, or by declining the prompt the first time the app shows it.

Removing ads forever

If you'd prefer no ads at all, the Remove Ads in-app purchase ($3.99) disables every ad — rewarded and interstitial alike — permanently. The purchase is tied to your Apple ID, so it carries over to future devices and survives reinstalls (use Restore Purchases in Settings).

Apple-handled features

Game Center

If you choose to sign in to Game Center, Apple manages everything: your nickname, your authentication, your friends list, and your leaderboard scores. We never see your Apple ID or personal information. The app submits your best length, endless-mode survival, and worms-eaten totals to leaderboards hosted by Apple, and reports achievement progress to Apple, but those submissions go directly from your device to Apple's servers. We have no servers and we receive no copy.

Game Center is entirely optional. The app is fully playable without signing in.

In-App Purchases

All purchases (Galaxy Pack, Royal Pack, Remove Ads) are processed by Apple's StoreKit. Apple handles payment, billing, and receipt verification. We never see your credit card, billing address, or App Store account details. The app stores only a verified receipt token from Apple, locally on your device, to confirm you own what you've bought.

Permissions we request

Worm Coil requests one permission, only on first launch:

App Tracking Transparency — Apple's standard prompt asking whether AdMob may use your IDFA for ad personalization. Decline and ads still serve, just non-personalized. You can change your mind later in Settings → Privacy & Security → Tracking.

We do not request camera, microphone, photos, contacts, calendar, location, motion, health, or push-notification permissions.

Children's privacy

The app is designed for a wide audience and is suitable for all ages. We do not knowingly collect any personal information from children — or, for that matter, anyone. Because we collect no data, COPPA, GDPR-K, and similar children's-privacy regulations are satisfied by default. If a child uses the device, parents may want to disable in-app purchases via iOS Screen Time → Content & Privacy Restrictions.

Future changes

We won't add new data collection or new third-party SDKs without first updating this page. Material changes will be reflected by an updated "Last updated" date at the top.

Contact

Questions, concerns, or curiosities about privacy? Reach out via the support page.