Since 2017, there has been e-invoice service providers developing in two forms: Web app (used with web browser) and Window application (software). Here are some examples:
| Web | Software |
| Viettel | Thai Son |
| BKAV | TS24 |
| VNPT | |
| Evat |
Some differences between Web app and Window Application
| Web app | Window Application (Software ) | |
| Architecture in use | Multi-layer (user client, database and server) | Two layers (between client and server) |
| Number of users | Multiple users at the same time (multiple user accounts) | Only one user at a time (usually only one user account) |
| Interoperability | Easy to use, user-friendly interface | Difficult to use, take time to get used to |
| Equipment system | Run on any computer (use on any internet browser) | Execute on a specific PC |
| Sharing data | Fast and convenient, can review old data anywhere | The system is usually a user |
| Storing data | Save on the server, not worry about losing data | Save on computer, if there is a problem, data will be lost and take time to recover |
| Upgrading version | Quick update | Need more time |
| Security | Complex security architecture | Simple security architecture |
* Note: When choosing an E-Invoice service provider, it should be noted that if that provider is also a Digital Signature manufacturer or an exclusive supplier of a Digital Signature brand, it is necessary to clearly discuss the compatibility of the E-Invoice with the Digital Signature that the business intends to use to sign the E-Invoice.