Canonical: https://kleidos.dev/overview/cardputer/ Updated: 2026-11-04 1. [Overview](https://kleidos.dev/overview/) 2. M5Cardputer ADV Overview # Kleidos on the M5Cardputer ADV Kleidos turns the M5Cardputer ADV into a password manager: it keeps your passwords encrypted on the board and types them into your computer over Bluetooth, after you unlock it on the board itself. The firmware costs nothing and asks for no account. There is nothing to install yet: version 0.1.0 is not released. The same firmware runs on [nine boards](https://kleidos.dev/overview/#devices), and I recommend none of them over the others: this page is what the Cardputer does with it. Updated 4 November 2026 1. [On screen](https://kleidos.dev/overview/cardputer/#on-screen) 2. [Controls](https://kleidos.dev/overview/cardputer/#board-controls) 3. [Capacity](https://kleidos.dev/overview/cardputer/#holds) 4. [Consumption](https://kleidos.dev/overview/cardputer/#draws) 5. [Price](https://kleidos.dev/overview/cardputer/#cost) 6. [Status](https://kleidos.dev/overview/cardputer/#release) ## Kleidos on its own screen Every recording here is of the Cardputer's own screen, with a demonstration vault on a development build. The same recordings are on the [recordings page](https://kleidos.dev/recordings/#fleet-clips), beside those of the other boards I have filmed.  [Live from the device](https://kleidos.dev/recordings/#provenance) **A one-time code** The Cardputer's vault steps from its passwords to its 2FA page, and both of its 2FA entries stand there, each with the ring that shows how long it has left. They are real codes, computed on the device for the moment the clip was recorded. Each picture's badge says how I made it, and [the legend of the badges](https://kleidos.dev/recordings/#provenance) explains every kind. - Live from the device ## What each control does Each row quotes what the Cardputer itself shows for that control: on the pages it shows the first time it starts, or in the bar at the foot of its vault list. **Enter** What the board says it does: “selects and opens” **Backspace** What the board says it does: “goes back or deletes” **fn with ↑ or ↓** What the board says it does: “move through a list” **fn with ← or →** What the board says it does: “change tab” **The letter keys** What the board says it does: “type a name to find it” I will write a guide to every screen, board by board, once the interface stops changing. ## What it holds, and how it keeps time The vault is the same on every board. What changes with the board is how much it holds, how it keeps time for the one-time codes and where its backups go. **Chip** ESP32-S3 **Input** Keyboard **Screen** 240×135 **Case** 84×54 mm **Capacity** 250 credentials, 40 two-factor codes **Clock** Internal, drifts through a sleep **Card slot** Yes: it writes its own backups ## What it draws from its battery What the Cardputer draws in each state, as the [measurements page](https://kleidos.dev/measurements/#boards) prints it, with what each state is and how each figure was taken. ### M5Cardputer ADV I give no battery estimate for it: nothing on it reads current, and putting the measurement system in its battery wire means taking the board apart. I publish no unlock time for it yet. **Asleep** not yet **Light sleep** not on this board **Normal use** not yet **Wi-Fi** not yet **Bluetooth** not yet Deep-sleeps with the chip still powered: its internal clock keeps counting, but drifts. ## What it costs Kleidos costs nothing: there is nothing to buy from the project and no account to make, and the firmware is free software under [GPL-3.0-or-later](https://www.gnu.org/licenses/gpl-3.0.html). What you pay for is the board. **Price** US$29.90 **Listed by** [M5Stack's own store](https://shop.m5stack.com/products/m5stack-cardputer-adv-version-esp32-s3) **Product code** K132-ADV **Read on** 1 November 2026 That is what the maker's own store asked on the day I read it, before shipping and taxes. Resellers ask their own, and the price moves. ## Where the firmware stands Kleidos is pre-release, at version 0.1.0: there is nothing to install yet, and [the roadmap](https://kleidos.dev/roadmap/#status) says what is left before the first release. **Version** 0.1.0 **To install** Nothing yet: no release is published **Hardened build** In development I have not had the firmware or the cryptography reviewed by anybody outside the project; [the security page](https://kleidos.dev/security/#verify) says what you can and cannot check. - [Previous board M5Stack Core2 v1.3](https://kleidos.dev/overview/m5stack-core2-v13/) - [Next board LilyGO T-Deck Plus](https://kleidos.dev/overview/tdeck-plus/) - [All nine boards](https://kleidos.dev/overview/#devices)