Read the guideOpen Jason
Pricing / 04

Start free. Remove the ceiling when it matters.

The engine is the same. Pro removes Jason's file-size and project limits and unlocks the Local Data Suite and advanced calculated columns.

Free

$0

The whole engine, with a stated ceiling.

  • Files up to 1,000,000,000 source bytes
  • Three local projects on the device
  • Search, sort, edit, and export
  • All measured performance work
Open Jason free
Pro

$19per month

The same engine with the ceiling removed.

  • No Jason-enforced file-size limit
  • Unlimited local projects
  • Local Data Suite formats and multi-file tools
  • Advanced calculated columns
  • Verified offline access with bounded grace
Upgrade to Pro

Secure checkout, tax calculation, receipts, and billing are handled by Polar.

Plan facts

Limits stated exactly.

Free file limit
1,000,000,000 source bytes, exactly.
Free projects
Three local projects on the device.
Pro file size
No Jason-enforced limit; the device and browser still set practical limits.
Pro projects
Unlimited by Jason; local storage capacity still applies.