DoublOne Studios Limited

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DoublOne Studios Limited is an independent software studio based in London that develops privacy-focused productivity, creativity, and wellness applications such as LeedPDF, PinkRain, Paperman, and DoublShot.

London, United Kingdom
doubl.one

About DoublOne Studios Limited

DoublOne Studios Limited is a small, independent software studio that designs and builds calm, privacy-first tools for everyday computing. Their portfolio includes apps like LeedPDF for natural-feeling PDF annotation, PinkRain for gentle health and wellness tracking, Paperman for adding paper-like textures to screens, and DoublShot for polished screenshots, along with other utilities and open‑source projects focused on design, productivity, and media.([doubl.one](https://doubl.one/)) The company operates under the DoublOne brand and emphasizes local-first, privacy-respecting software that runs natively on users’ devices without invasive data collection.

A charge labeled "POLAR* DOUBLONE-STUDIO" likely reflects a purchase, in‑app upgrade, or one‑time license for one of DoublOne’s paid apps (for example LeedPDF, Paperman, DoublShot Pro, or PinkRain) processed through Polar, a merchant‑of‑record billing platform for developers.([apps.apple.com](https://apps.apple.com/us/app/leedpdf/id6751741956?mt=12&utm_source=openai)) Polar appears on the descriptor as the payment/billing intermediary (“POLAR*”), while "DOUBLONE-STUDIO" (a truncated form of DoublOne Studios) identifies the actual software creator you bought from. The amount will typically correspond to an App Store/macOS purchase price, a one‑time license fee, or a small subscription tied to one of their apps or services.

To verify the charge, you can first cross‑check recent purchases in the Apple App Store or Mac App Store under your Apple ID, comparing the app names, dates, and exact amounts with the transaction on your card. Then, visit doubl.one and review the specific product pages or pricing, or search your email (including spam) for receipts from Apple, Polar, or DoublOne around the transaction date.([doubl.one](https://doubl.one/)) If you still don’t recognize it, contact DoublOne via their published email (hello@doubl.one) or support links, or reach out to your card issuer to dispute the charge; providing them with the full descriptor, date, and amount will help them identify whether it originated from a Polar‑processed software purchase linked to your accounts.([doubl.one](https://doubl.one/))

Bank Statement Variations

1 known variations

These are the raw merchant codes that appear on bank and credit card statements that we've identified as belonging to DoublOne Studios Limited.

  1. POLAR* DOUBLONE-STUDIO 3479730671

Frequently Asked Questions

Why does my statement show POLAR* DOUBLONE-STUDIO instead of DoublOne or the app name?

Polar is a merchant-of-record billing platform that handles payments, taxes, and invoicing on behalf of software makers. In this case, Polar appears first on the descriptor ("POLAR*") as the billing provider, and "DOUBLONE-STUDIO" is a shortened reference to DoublOne Studios Limited, the developer of the app or software you purchased.([polar.new](https://polar.new/?utm_source=openai))

Which purchases from DoublOne could result in a POLAR* DOUBLONE-STUDIO charge?

You may see this descriptor if you purchased or upgraded one of DoublOne’s paid products, such as LeedPDF, Paperman, DoublShot Pro, GoldenDay, PinkRain, or similar utilities sold under the DoublOne brand. The amount usually matches the listed price or in‑app purchase tier shown on the App Store or DoublOne’s product sites around the time of the charge.([doubl.one](https://doubl.one/))

How can I confirm which specific DoublOne product I was billed for?

Check your Apple App Store or Mac App Store purchase history for the same date and amount as the card transaction; you should see an app such as LeedPDF, PinkRain, Paperman, or DoublShot listed there. Then, compare that with any email receipts from Apple, Polar, or DoublOne and with pricing shown on doubl.one or the relevant product page to confirm the exact source of the charge.([apps.apple.com](https://apps.apple.com/us/app/leedpdf/id6751741956?mt=12&utm_source=openai))

Is the POLAR* DOUBLONE-STUDIO charge a one-time payment or a recurring subscription?

Most of DoublOne’s current apps are sold as one‑time purchases or one‑time in‑app upgrades, so many charges will be one‑off. However, some DoublOne products (such as certain AI or email tools) may use recurring subscription models, billed via Polar. To check, review the transaction in your App Store subscriptions or Polar customer portal (if available) and look for recurring billing information or renewal dates.([doubl.one](https://doubl.one/))

How do I cancel a recurring subscription from DoublOne processed via Polar?

If the subscription is managed through the Apple App Store or Mac App Store, go to your Apple ID settings, open Subscriptions, find the relevant DoublOne app, and choose Cancel. If you subscribed through a web checkout powered by Polar, look for a “Manage billing” or “Manage subscription” link in your original receipt from Polar or DoublOne; that portal will let you downgrade or cancel your plan. If you cannot locate it, email hello@doubl.one with your full name, charge details, and the email used at checkout.([polar.new](https://polar.new/?utm_source=openai))

How can I request a refund for a POLAR* DOUBLONE-STUDIO transaction?

For App Store purchases (iOS/macOS), request a refund through Apple’s “Report a Problem” page using your Apple ID; Apple controls billing and refunds for those transactions even if DoublOne is the developer. For any web-based payments collected via Polar, locate your Polar or DoublOne receipt and either use the embedded refund/help link or contact DoublOne directly at hello@doubl.one, including the date, amount, and last four digits of the card so they or Polar can locate the transaction.([apps.apple.com](https://apps.apple.com/us/app/leedpdf/id6751741956?mt=12&utm_source=openai))

Why do I see a small or duplicate POLAR* DOUBLONE-STUDIO amount pending on my card?

Polar or your payment processor may place temporary authorization holds when validating your card, when upgrading a plan, or when retrying a failed payment; these holds can appear as small or duplicate pending amounts with the same descriptor. Such authorizations usually fall off automatically within a few business days and do not settle as final charges—only the completed purchase or subscription fee should remain posted on your statement.([polar.new](https://polar.new/?utm_source=openai))

How can I contact DoublOne if I still don’t recognize this charge?

You can contact DoublOne Studios Limited through their official website at doubl.one or by emailing hello@doubl.one, which is listed in both their site and App Store publisher details.([doubl.one](https://doubl.one/))

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