| Price from | £9.99/mo | — |
| Free plan | — | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| Plans published | 1 | 2 |
| Spec score · AI Tax Software | 8.1 (#10) | 7.7 (#20) |
| Product | Bart is an AI-powered tax assistant that sorts transactions, tracks deadlines, and files to HMRC. | OK Tax is a source code package and API service that an agent uses to prepare a tax return locally with review checkpoints before filing. |
| Security | The security policy says data in transit uses TLS, server data is encrypted at rest with AES-256, and sensitive fields receive additional AES-256-GCM application-level encryption. | The privacy policy says the company uses administrative, technical, and organizational measures intended to protect information, but does not guarantee perfect security or confidentiality. |
| Support | The homepage says users can chat with Bart anytime; the Google Play listing provides support at [email protected]. | The site lists [email protected] for help and privacy questions. |
| Supported income | Bart currently supports quarterly updates for self-employment income; UK and foreign property income are not currently supported. | Supported scope includes W-2 income, interest and dividends, basic stock sales, crypto activity, freelance and Schedule C income, basic rental real estate, and selected Form 1040-NR cases. |
