Overview
DevKit ("the Extension") is a Chrome browser extension that provides developer utilities including a JSON formatter, Base64 encoder/decoder, JWT decoder, regex tester, timestamp converter, UUID generator, color picker, and Pro features available via a one-time purchase.
This Privacy Policy explains what data the Extension processes, how it is used, and your rights as a user. The short version: your data stays on your device.
Data Collection
DevKit does not collect, transmit, or store any personal data on external servers.
Specifically, the Extension does not:
- Track your browsing history or visited URLs
- Read the content of web pages you visit
- Send input data (JSON, tokens, strings, regex patterns, API requests) to any server operated by the developer
- Use analytics, crash reporting, or telemetry services of any kind
- Display advertisements
- Require you to create an account or provide personal information
- Share any data with third parties, except as described in the License Verification section
Local Storage
The Extension uses Chrome's built-in chrome.storage.sync API to store data locally on your
device. This data may be synced across your Chrome profiles via your Google account as part of Chrome's
standard sync functionality.
| Data | Purpose | Tier |
|---|---|---|
| Pro license key | Verify your one-time purchase and keep Pro features unlocked across devices | Pro |
| Pro unlock status | Remember that Pro has been activated without re-verifying on every use | Pro |
| Saved snippets | Store regex patterns, strings, and UUIDs you choose to save in the Snippet Library | Pro |
| User preferences | Remember your last-used tool and display settings | Free & Pro |
Chrome sync storage is governed by Google's Privacy Policy. You can clear all Extension data at any time by removing the
Extension from Chrome or clearing your Chrome sync data in chrome://settings/syncSetup.
License Verification
When you enter a Pro license key, the Extension sends a verification request to the Gumroad API. This request contains only:
- Your license key (a randomly generated string with no personal identifiers)
- The Extension's product ID (a fixed, public identifier)
No other data is transmitted. The sole purpose of this request is to confirm the validity of your purchase. Verification occurs once when you first enter your key, and periodically at startup.
The Gumroad API is operated by Gumroad, Inc. and is subject to their Privacy Policy.
API Tester (Pro Feature)
When you use the API Tester, the Extension sends HTTP requests directly from your browser to the URL you specify. These requests originate from your browser and are not routed through any intermediate server operated by the developer.
You are solely responsible for the data you enter into and transmit via the API Tester. Do not use it to send sensitive credentials or personal data to untrusted endpoints.
Chrome Permissions
The Extension requests the minimum permissions necessary to function:
| Permission | Reason |
|---|---|
storage |
Save your license key, Pro status, snippets, and preferences locally via
chrome.storage.sync
|
clipboardWrite |
Allow one-click copying of formatted output (JSON, UUIDs, encoded strings) to your clipboard |
The Extension does not request access to your browsing history, open tabs, cookies, or web page content.
Third-Party Services
The Extension interacts with one third-party service:
- Gumroad (gumroad.com) – used exclusively for Pro license key verification. See Gumroad's Privacy Policy.
No analytics platforms, advertising networks, error tracking services, or other third parties are used.
Children's Privacy
DevKit is a developer tool intended for use by adults and is not directed at children under the age of 13. The Extension does not knowingly process any data from children.
Changes to This Policy
If this Privacy Policy changes, the updated version will be published at this URL with a new "Last updated" date. Significant changes will also be noted in the Extension's changelog in the Chrome Web Store.
Contact
If you have questions about this Privacy Policy or the Extension's data practices, please contact:
- Name: [Leon Hoscheidt]
- Email: lh.webapps@gmail.com
This privacy policy is written in plain language intentionally. Developer tools handle sensitive data – you deserve to know exactly what happens to yours: nothing leaves your browser except a license key check to Gumroad.