ChessPrep Support

Last updated: 6 August 2026

ChessPrep is made by one person, Arkadii Kliashtornyi. Write to ark.motion.4k@gmail.com — every message is read, and you will normally get an answer within two or three days. There is no phone line and no chatbot in the loop.

Quick answers

I forgot my password

On the sign-in screen choose “Forgot password?” and enter the recovery key you were shown when you created the account. That is the only way to reset a password, so keep the key somewhere safe — you can save a fresh one any time in Settings → Account & recovery. If the key is lost the account cannot be opened again, but everything on a device where you are still signed in stays there and can be exported.

My openings are not on my other device

Openings sync through your account, so sign in with the same username on both devices and give it a few seconds. The sidebar shows the sync state. If a device has been offline, open the app while it has internet and let it finish before closing it.

I want a copy of my data, or I want it deleted

Settings has both, in two places: Privacy & your data → Export my data downloads everything we hold about your account as a JSON file, and Danger zone → Delete account erases it from our servers permanently. You can also ask by email and we will do it for you.

The engine will not start, or the app feels slow

The analysis engine is Stockfish compiled to WebAssembly and it downloads once (tens of megabytes), so the first analysis on a new device needs a decent connection. If it never appears, reload the page; if it still fails, tell us which browser and device you use. Everything except the opening explorer, cloud sync and the puzzle pack works offline.

Installing ChessPrep on a phone

ChessPrep is a web app you can install: in Chrome or Edge use Install app from the browser menu, and in Safari on iOS use Share → Add to Home Screen. It then opens in its own window, with no browser bars.

Changing the language

Settings → Language. English, Russian and Spanish are available, and the choice is stored with your account so it follows you to your other devices.

Premium and payment

ChessPrep is in beta and both plans are free — nothing is charged, and no payment details are collected anywhere in the app. If paid plans start later, existing accounts will be told first.

Reporting a bug

Email ark.motion.4k@gmail.com with what you did, what you expected and what happened instead, plus your device and browser. A screenshot helps more than anything else.

Reporting a person or abusive content

Chat messages and community posts carry a Report action, and you can block anyone from your friends list — a blocked account cannot message you again. Reports reach the owner directly and are acted on within 24 hours. Anything urgent or serious can go straight to ark.motion.4k@gmail.com with the word “report” in the subject.

Contact

Email: ark.motion.4k@gmail.com
Responsible person: Arkadii Kliashtornyi, an independent developer in Germany
Website: chessprep.org

We answer in English and Russian. Please do not include passwords or recovery keys in an email — we never need them and can never read them.