Privacy policy
Last updated 13 November 2026. This covers the website powerups.stumason.dev and the Power-Up "Spreadsheet Importer" for Trello.
The data controller is Stu Mason, a sole trader in the United Kingdom. Contact: support@stumason.dev.
The short version
- Your spreadsheets and your Trello cards do not pass through or get stored on our servers.
- We keep one small record per paying workspace: its Trello workspace id and the ids Stripe gives us for the subscription.
- We do not keep Trello member names, usernames, email addresses or member ids.
- No advertising, no analytics trackers, no selling or sharing of data.
What the Power-Up handles, and where
| Data | Where it goes | Kept by us? |
|---|---|---|
| The spreadsheet you choose | Read inside your browser only. | No. It is never uploaded. |
| Cards, lists, labels, members and custom fields of the board | Between your browser and Trello's own API, using the permission you grant in Trello. | No. |
| The permission token Trello issues when you choose Allow | Stored in your browser by Trello's own Power-Up library. It lasts 30 days. | No. We never receive it. |
| Your column matching for a board | Stored in Trello, as private Power-Up data for you on that board. | No. |
| The undo record of your recent imports (old and new values of the fields that were changed) | Stored in your browser, for the last five imports per board, and in the undo file if you download it. | No. |
| A signed token from Trello saying which board, workspace and member opened the Power-Up | Sent to our server to check for a subscription. It is checked and discarded. | No. Only the workspace id is used for the lookup, and nothing is stored when you have no subscription. |
| Subscription record: Trello workspace id (or board id for a board outside any workspace), Stripe customer id, Stripe subscription id, status and paid-up date | Our server. | Yes, while the subscription exists and for up to 12 months after it ends. |
| Payment details, billing name, email and address | Entered on Stripe's own pages and held by Stripe. | We can see the billing name, email, country and last four card digits in Stripe. We never see the full card number. |
| Emails you send to support | Our mailbox. | Yes, for up to two years. |
Where data is stored
- Cloudflare hosts this website and the subscription record. Cloudflare runs its network worldwide and may store and process that record in data centres in the United Kingdom, the European Union, the United States and other countries where it operates.
- Stripe processes payments, in the United States and Ireland.
- Google hosts the support mailbox, in the European Union and the United States.
Where personal data leaves the United Kingdom, it does so under those providers' standard contractual clauses or an adequacy decision.
Why we hold it
The subscription record and payment data are held to provide what you have paid for and to meet tax and accounting law. Support emails are held so that we can answer you. Cloudflare keeps short-lived technical logs (such as IP addresses) to keep the service secure.
Cookies
This site and the Power-Up set no cookies. Stripe sets its own cookies on its payment pages.
Your rights
You can ask for a copy of what we hold about you, ask us to correct or delete it, or object to how it is used. Write to support@stumason.dev and you will get an answer within 30 days. To remove what is held in your browser, clear the site data for powerups.stumason.dev, and revoke the permission in Trello under Settings, then Applications. In the United Kingdom you can also complain to the Information Commissioner's Office at ico.org.uk.
Changes
If this policy changes in a way that affects what is collected, the date at the top will change and the change will be described here.