Arasan
Analysis by Arasan, a chess engine by Jon Dart, since 1994. github.com/jdart1/arasan-chess
Plyfolio runs Arasan on your phone to review finished games, never while you record. Its network file is inside the app, so nothing is downloaded and nothing is sent anywhere.
Plyfolio is made by Remiam Limited. Arasan's author did not make Plyfolio and does not endorse it.
Version included: Arasan 26.1 development source (commit 6e432a2, 4 November 2026), network arasanv10-20261102.nnue. Arasan is used under the licence below, which also covers its network file. Arasan comes with no warranty, as the licence says.
Arasan licence
Arasan chess engine software, including the contents of the src, book, doc, prj, tests, and network directories of the software archive, is distributed under the following License:
Copyright 1994-2026 by Jon Dart
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
In the app
The same list as Settings, Licences in the app.
| Component | Licence | Used for |
|---|---|---|
| Livvic | SIL Open Font Licence 1.1 | The type, in the app and on this site |
| chess.js | BSD 2-Clause | Checking moves, reading and writing PGN |
| React Native | MIT | The app framework |
| Expo | MIT | Building and running the app, storage, sounds, haptics, files and photos |
| React Native Reanimated | MIT | Motion |
| React Native Gesture Handler | MIT | Gestures |
| React Native SVG | MIT | Drawing pieces, boards and charts |
| React Native View Shot | MIT | Saving board images |
| SQLite | Public domain | Storing your library on the phone |
| MapLibre React Native | MIT | Maps of your places |
| MapLibre Native | BSD 2-Clause | Drawing the maps |
| Map data, OpenStreetMap contributors | Open Database Licence (ODbL) 1.0 | What the maps show |
| Map tiles, OpenMapTiles | CC BY 4.0, served by OpenFreeMap | The map tiles |
| Map labels, Noto Sans | SIL Open Font Licence 1.1 | Place names on the maps |
| three.js | MIT | The 3D board, in the app and on this site |
| expo-three | MIT | The 3D board in the app |
On this website
This site also uses Livvic, chess.js and three.js, listed above, and:
| Component | Licence | Used for |
|---|---|---|
| Nuxt | MIT | Building this site |
| Vue and Vue Router | MIT | Pages and navigation on this site |
Tools used only to make the site and its 3D models, and not sent to your browser: marked (MIT), glTF Transform (MIT), meshoptimizer (MIT), three-bvh-csg (MIT) and three-mesh-bvh (MIT). Google Analytics and Google Tag Manager load only with your consent, under Google's terms; see Cookies.
Full licence texts
Each component's full licence text, with its copyright notice, is shown in the app under Settings, Licences. The 3D board and pieces, the Plyfolio marks and the interface icons are our own work.
Company details
- Company
- Remiam Limited, a private company limited by shares, registered in England and Wales
- Company number
- 10829191
- Registered office
- Winchester, Hampshire. [registered office address to confirm]
- ICO registration
- ZA917465
- VAT
- Not VAT registered
- Privacy and legal contact
- [email protected]