John JayasankarLabs

Independent products · 2026

Instruments I shipped. Built end-to-end. No demos.

Consumer tools, a native macOS app, a live football command center, pricing tools, and a model for when a workflow should get an agent.

  • 08 live
  • 04 featured
  • New York

RideLens · compare board

Illustrative trip · four providers, three sort rules

4  to 1providers  to one board

Illustrative quote types, not live fares · the final fare is always confirmed in the provider app

Phases1-4 · select to hold

Reading the illustrative interfaceOne trip mapped once on live roads across Uber, Lyft, Empower and Curb, and the same quotes ranked by price, soonest pickup or value, with upfront prices, ranges and estimates kept distinct and expired quotes never on top.

Open RideLensCase study (opens in a new tab)

02Also shipped

Narrower instruments. Same bar.

Smaller in scope, held to the same rule. Each carries its own worked example and its own figures, counted the same way.

05 / Decision model

AgentFit

When should a workflow get an agent?

AgentFit scores economic opportunity, technical readiness, controllability, and risk before anyone writes an orchestration graph.

  • 31autonomy gates
  • 6rungs, 0 to 5
  • 15reference workflows

06 / Tool

Cartonry

Packaging dielines: cut, crease, fold, cost.

Production-ready packaging dielines at any size. Export SVG, true-scale PDF, and DXF. Runs entirely in your browser.

  • 11box styles
  • 3export formats
  • 2styles free to export

07 / Pricing

KeepFloor

The Etsy list price that still pays you.

One listing, the published fee stack, and the lowest charmed price that survives Offsite Ads. Math stays on this device.

  • 3price floors
  • 7published fee lines
  • Localmath stays on this device

08 / Workbook

Pricing Hub

Contractor job costing, estimate to invoice.

Estimate, schedule, track crew hours and costs, handle change orders, invoice, and see real profit per job. 24 connected sheets for Excel and Google Sheets.

  • 24connected sheets
  • 893formula checks in Excel
  • 0macros or add-ins

Each figure on these cards is counted from the build’s own repository, or dated where it cannot be counted, and every rule below names the mechanism that enforces it. Last checked 25 September 2026.

03What they share

No demos. The rule each build keeps.

  • 01 · RideLens

    Ranges stay ranges.

    When a fare is a range, both ends stay on the board. RideLens never invents a midpoint to look decisive.

  • 02 · Daylight

    Success is not evidence.

    Daylight separates what it asked for, what macOS accepted, and what it could read back and confirm.

  • 03 · RailDrop

    Never an invented price.

    If the live board is down, RailDrop says so. It never guesses a fare, a change fee, or an itinerary.

  • 04 · Gridiron

    Reported, never guessed.

    Every spot, clock, and chance comes from a source that reported it. A missing ball spot says so; it is never guessed to midfield.

  • 05 · AgentFit

    Fit is not autonomy.

    A workflow can score in the eighties and still warrant nothing beyond human-approved execution.

  • 06 · Cartonry

    Not a picture.

    The 3D fold is the geometry the dieline is cut from, and the tests fold the net and measure it against the dimensions typed.

  • 07 · KeepFloor

    Every published fee, counted.

    The whole published fee stack, including Offsite Ads, then the lowest charmed list price that survives it.

  • 08 · Pricing Hub

    Plain formulas only.

    No subscription, no add-ins, no macros. Every link between sheets is a real formula reference.