If you prioritize privacy and have the technical expertise to manage an open-source deployment, choose private-gpt. It's ideal for developers building AI applications and companies that handle sensitive information, as it runs fully locally without data exposure. However, if you prefer cloud-based solutions or lack technical skills, this might not be suitable for you.
On the other hand, if your needs revolve around processing a high volume of PDFs in a secure environment, go with Stirling-PDF. While it has a free tier, be aware that costs can accumulate based on usage. It's perfect for businesses that require robust document handling but consider avoiding it if you rely on a comprehensive mobile app or want a usage-unrestricted free tool.