Kobo announced in November 2026 a new monthly subscription service called Stack that allows users to upload personal ebooks and documents to Kobo’s servers, syncing reading progress, highlights, and annotations across multiple devices and apps.
Stack is being introduced alongside a major 6.0 firmware update for Kobo’s e-reader software, currently available as an optional beta ahead of a wider official release. Supported file types include EPUBs and PDFs up to 200MB in size. Users can upload files via a drag-and-drop interface on Kobo’s website or by emailing them to a custom address provided with a Stack subscription. Uploaded content is accessible across Kobo’s iOS and Android apps, its website, and compatible e-readers.
E-reader support is currently limited to recent Kobo devices — the Clara BW, Clara Colour, Libra Colour, and Elipsa 2E — though Kobo says support for older devices made between 2018 and 2024 will arrive soon. The initial rollout covers Canada, Ireland, Australia, New Zealand, the UK, and Spain, with no US availability announced. Canadian pricing is $3.99 per month; UK pricing is £2.99 per month. Kobo CEO Michael Tamblyn shared these details on Threads.
Kobo is offering a free 90-day trial for new subscribers. Users who cancel receive a 60-day grace period to download their files and export notes before everything is permanently deleted.
Stack is similar in function to Amazon’s Send to Kindle feature, which lets users upload files to their Kindle library at no cost. Kobo’s version requires a paid subscription, which may be a consideration for users weighing the two services.
Additional features in the 6.0 firmware update include support for multiple library cards through Libby, lower stylus latency on pen-enabled devices, larger font options for accessibility, and support for EPUB files protected by LCP DRM.
Source: The Verge