• Calculate reviewer agreement percentage and dissenting contribution count from safe integer contribution totals.
• Apply the same explicit rule consistently during ingest, quality control, reporting, or preservation planning.
• Expose records that need human review without silently rewriting the source data.

The denominator counts contributions, not unique people, so repeated votes can change the result unless deduplicated first.^[1]

• Agreement with an accepted value measures consensus, not correctness, independence, inter-rater reliability, or confidence intervals.
• Preserve the original value and record the rule version when using this result in an archival workflow.

• OCR Confidence Score Below Threshold Word Counter

  Use OCR Confidence Score Below Threshold Word Counter to count OCR confidence scores strictly below a configurable 0–1 review threshold and return the affected fraction. Choose this tool when you need to calculate reviewer agreement percentage and dissenting contribution count from safe integer contribution totals.

• Proportion Confidence Interval

  Use Proportion Confidence Interval to estimate a population proportion with a two-sided normal-approximation confidence interval. Choose this tool when you need to calculate reviewer agreement percentage and dissenting contribution count from safe integer contribution totals.

• Transcription Progress Character Count Percent Calculator

  Report transcription progress as the percentage of transcribed characters relative to the total expected character count.

• OCR Confidence Score Below Threshold Word Counter

  Count OCR word confidence scores that fall below a review threshold and report the affected fraction of the transcribed words.

• Country Code ISO 3166 Alpha-2 Validator

  Validate whether a normalized two-letter value is a currently assigned ISO 3166-1 alpha-2 country code. Reserved and user-assigned letter pairs are not accepted.