Querycairn: Explain Plans

Read PostgreSQL Plan JSON

$0.99 · Designed for iPad. Not verified for macOS.

Import PostgreSQL EXPLAIN JSON offline, compare estimated and actual rows, trace loops and predicates, and turn plan evidence into review actions. Querycairn is a private query-plan interpretation bench for developers, database administrators, consultants, and technical teams who need a focused second screen without pasting schema or plans into a website. Surface the nodes where row-estimate error and loop amplification make a seemingly small plan expensive. KEY FEATURES - PostgreSQL EXPLAIN JSON import - Recursive plan-node inventory - Estimated-versus-actual row view - Loop and predicate risk scoring - Node owner and hypothesis notes - Statistics and index checklist - Plan findings export - Database credentials never requested - Native structured-file or CSV import - Local PDF, workspace JSON, and domain-artifact export - 48 original offline technical reference plates - No account, ads, analytics, tracking, IAP, or subscription Querycairn interprets recorded PostgreSQL plan fields and entered context; it does not connect to a database, execute SQL, recommend an index automatically, or prove a change is safe. EXPLAIN ANALYZE executes the statement. Use controlled data, representative parameters, and expert review.

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    Information

    Seller
    • Robert Corbin
    Size
    • 39.3 MB
    Category
    • Developer Tools
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Robert Corbin
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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