If you're looking for alternatives to Adobe PDF Services API specifically for OCR and redaction, here are strong options depending on whether you want a cloud API, enterprise SDK, or open-source/self-hosted approach.

1) ABBYY Vantage / Cloud OCR SDK

Best for: High-accuracy OCR, complex documents, forms, multilingual text

• OCR: Excellent accuracy, especially on scanned docs and low-quality images
• Redaction: Not typically its strongest feature; usually you’d combine OCR with a PDF redaction tool
• Pros: Very strong document understanding, enterprise-ready
• Cons: Can be expensive; redaction workflows may require extra tooling

2) AWS Textract + PDF tooling

Best for: Cloud OCR at scale, forms/tables extraction

• OCR: Strong OCR with form and table extraction
• Redaction: Not built-in as a true PDF redaction service; you’d need to apply redaction separately with a PDF library
• Pros: Scalable, good integration with AWS ecosystem
• Cons: Not a complete PDF redaction solution by itself

3) Google Cloud Document AI / Vision OCR

Best for: OCR and document classification/extraction

• OCR: Good OCR, especially through Vision API; Document AI is better for structured docs
• Redaction: Typically not a redaction product; use with a PDF editor/library
• Pros: Good for enterprise workflows
• Cons: Redaction requires additional implementation

4) Microsoft Azure AI Document Intelligence

Best for: OCR plus structured document extraction

• OCR: Solid OCR, handwriting support in some cases
• Redaction: Not a native redaction service
• Pros: Good enterprise integration, decent accuracy
• Cons: Redaction needs separate PDF handling

5) iText PDF SDK

Best for: Programmatic PDF redaction and manipulation

• OCR: Not an OCR engine itself
• Redaction: Strong PDF redaction capabilities when combined with OCR or text extraction
• Pros: Mature PDF library, suitable for true redaction workflows
• Cons: Commercial licensing; OCR must come from elsewhere

6) Apryse (formerly PDFTron)

Best for: Full PDF SDK with OCR and redaction

• OCR: Supports OCR via integrations and SDK features
• Redaction: Very strong redaction capabilities
• Pros: One of the closest alternatives to Adobe for PDF workflows
• Cons: Commercial product; pricing may be significant

7) Foxit PDF SDK

Best for: PDF editing/redaction in enterprise apps

• OCR: Available via integrations or related products
• Redaction: Supported
• Pros: Enterprise-grade PDF workflow tooling
• Cons: OCR may not be as strong as dedicated OCR vendors

8) Open-source stack: Tesseract + PDF libraries

Best for: Cost-sensitive, self-hosted solutions

• OCR: Tesseract is the common open-source OCR engine
• Redaction: Can be done with libraries like PyMuPDF, PDFBox, qpdf, or pikepdf
• Pros: Low cost, flexible, self-hosted
• Cons: More engineering effort; OCR accuracy usually lower than enterprise cloud services

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Recommended combinations

If you need both OCR and redaction in one commercial SDK:

• Apryse
• Foxit
• iText + OCR engine

If OCR quality is your top priority:

• ABBYY
• Google Cloud Vision / Document AI
• AWS Textract
• Azure Document Intelligence

If you need true, secure PDF redaction:

Look for tools that support actual content removal, not just drawing black boxes on top. Good choices:

• Apryse
• iText
• Foxit
• PyMuPDF / PDFBox / qpdf for DIY implementations

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Important redaction note

Many tools only provide visual masking. Real redaction must:

• Remove underlying text, images, annotations, metadata, and layers
• Rebuild PDF objects safely
• Prevent text recovery

If compliance matters, verify the tool does true redaction.

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If you want, I can also give you:

1. a comparison table,
2. open-source-only alternatives, or
3. best options by budget/use case.