1. Data manipulation capability: SheetDB allows for easy data manipulation through its APIs, providing the ability to read, write, and update data in Google Sheets directly. On the other hand, Sheetson focuses on providing a simple JSON API to work with Google Sheets data, limiting the direct data manipulation options available to users.

2. Security features: SheetDB offers OAuth2 authentication to ensure secure access to Google Sheets data, while Sheetson does not offer this level of security, potentially exposing data to unauthorized access.

3. Pricing model: SheetDB operates on a freemium model, offering a free plan with limited functionality and paid plans for more advanced features. In contrast, Sheetson is completely free to use, making it a more cost-effective option for users looking to work with Google Sheets data without any additional costs.

4. Data retrieval methods: SheetDB allows users to fetch data using SQL-like queries, providing a more versatile approach to accessing specific data within Google Sheets. On the contrary, Sheetson primarily relies on specific endpoints for data retrieval, limiting the flexibility in fetching data as needed.

5. Storage capability: SheetDB has the ability to store data directly within Google Sheets, allowing for easy integration and management of data within the same platform. In comparison, Sheetson does not have storage capabilities, relying solely on retrieving and manipulating data already present in Google Sheets.

6. Support and documentation: SheetDB offers extensive documentation and support for users, including API guides and tutorials to help users navigate the platform effectively. Conversely, Sheetson lacks comprehensive documentation and may not offer the same level of support for users looking to leverage its services effectively.

In Summary, the key differences between SheetDB and Sheetson lie in data manipulation capabilities, security features, pricing models, data retrieval methods, storage capabilities, and support/documentation provided to users.