# Premium apps

> A network of 19 focused, deterministic tools. Every tool has a human page, a JSON API, an OpenAPI description and an MCP tool that all return the same result (inputs, result, units, assumptions, sources, timestamps).

## Machine interfaces
- Tool catalog (JSON): https://apps.usefulweb.site/api/v1/tools
- OpenAPI (all tools): https://apps.usefulweb.site/openapi.json
- MCP server (all tools + workflows): https://apps.usefulweb.site/mcp
- Pick a tool for a natural-language request: POST https://apps.usefulweb.site/api/v1/tools/prompt-to-tool-router/calculate {"request": "..."}

## Tools
- [Kerfwise Cabinet Builder](https://kerfwisecabinetbuilder.usefulweb.site/): Parametric cabinet → every part with cut sizes, edge banding, drilling and hardware. API: POST https://apps.usefulweb.site/api/v1/tools/kerfwise-cabinet-builder/calculate
- [Kerfwise Cut List & Cost](https://kerfwisecutlist.usefulweb.site/): Cabinets or a Kerfwise project → cut list, edge banding, hardware, sheets and costs. API: POST https://apps.usefulweb.site/api/v1/tools/kerfwise-cut-list/calculate
- [Kerfwise Sheet Nesting Optimizer](https://kerfwisesheetnesting.usefulweb.site/): Nest rectangular parts on sheets with kerf, trim and grain: layouts, yield, offcuts, SVG + DXF. API: POST https://apps.usefulweb.site/api/v1/tools/kerfwise-sheet-nesting/calculate
- [Kinetica Collision Check](https://kineticacollisioncheck.usefulweb.site/): Robot pose + obstacles → collisions, minimum clearance and self-collision between links. API: POST https://apps.usefulweb.site/api/v1/tools/kinetica-collision-check/calculate
- [Kinetica Forward Kinematics](https://kineticaforwardkinematics.usefulweb.site/): DH table or URDF + joint values → TCP pose, every joint frame, Jacobian and manipulability. API: POST https://apps.usefulweb.site/api/v1/tools/kinetica-forward-kinematics/calculate
- [Kinetica Inverse Kinematics](https://kineticainversekinematics.usefulweb.site/): Target TCP pose → all joint solutions found, residuals, joint limits and reachability. API: POST https://apps.usefulweb.site/api/v1/tools/kinetica-inverse-kinematics/calculate
- [Kinetica Trajectory Planner](https://kineticatrajectoryplanner.usefulweb.site/): Waypoints (PTP, LIN, CIRC) + limits → timed joint samples, cycle time and peak velocities. API: POST https://apps.usefulweb.site/api/v1/tools/kinetica-trajectory-planner/calculate
- [Ohmforge AC Sweep (Bode plot)](https://ohmforgeacsweep.usefulweb.site/): Frequency response of a circuit: Bode magnitude/phase, −3 dB corner and unity gain. API: POST https://apps.usefulweb.site/api/v1/tools/ohmforge-ac-sweep/calculate
- [Ohmforge DC Operating Point](https://ohmforgedcoperatingpoint.usefulweb.site/): SPICE netlist in, node voltages, branch currents, power and overload warnings out. API: POST https://apps.usefulweb.site/api/v1/tools/ohmforge-dc-operating-point/calculate
- [Ohmforge LED Resistor Calculator](https://ohmforgeledresistor.usefulweb.site/): Series resistor for LEDs, rounded to a standard value and checked with a real diode model. API: POST https://apps.usefulweb.site/api/v1/tools/ohmforge-led-resistor/calculate
- [Ohmforge Transient Simulation](https://ohmforgetransient.usefulweb.site/): Simulate a circuit over time: waveforms, Vpp/RMS/frequency, CSV and a chart. API: POST https://apps.usefulweb.site/api/v1/tools/ohmforge-transient/calculate
- [Threadsmith Design Stats](https://threadsmithdesignstats.usefulweb.site/): Stitch count, colours, trims, thread, bobbin, sewing time and density of a DST/EXP file. API: POST https://apps.usefulweb.site/api/v1/tools/threadsmith-design-stats/calculate
- [Threadsmith Digitizer](https://threadsmithdigitize.usefulweb.site/): Turn shapes, SVG paths, text or a whole project into embroidery stitches with stats and preview. API: POST https://apps.usefulweb.site/api/v1/tools/threadsmith-digitize/calculate
- [Threadsmith Stitch File Writer](https://threadsmithstitchfile.usefulweb.site/): Write Tajima DST or Melco EXP machine files from a stitch list or a Threadsmith project. API: POST https://apps.usefulweb.site/api/v1/tools/threadsmith-stitch-file/calculate
- [Twinworks Bottleneck Analysis](https://twinworksbottleneckanalysis.usefulweb.site/): Find the constraint of a production line and test fixes: ranked bottlenecks with what-if gains. API: POST https://apps.usefulweb.site/api/v1/tools/twinworks-bottleneck-analysis/calculate
- [Twinworks Buffer & Parameter Sweep](https://twinworksbuffersweep.usefulweb.site/): Sweep a buffer size (or any parameter) and get the throughput curve with confidence intervals. API: POST https://apps.usefulweb.site/api/v1/tools/twinworks-buffer-sweep/calculate
- [Twinworks Factory Simulation](https://twinworkssimulate.usefulweb.site/): Simulate a production line: throughput, lead time, WIP, OEE and the bottleneck, with CIs. API: POST https://apps.usefulweb.site/api/v1/tools/twinworks-simulate/calculate
- [Twinworks Line Balancing](https://twinworkslinebalance.usefulweb.site/): Assign assembly tasks to stations for a takt time: efficiency, balance delay and smoothness index. API: POST https://apps.usefulweb.site/api/v1/tools/twinworks-line-balance/calculate
- [Twinworks Queueing Check](https://twinworksqueueformulas.usefulweb.site/): M/M/1, M/M/c, M/D/1, M/G/1 and Kingman waiting times — optionally verified by simulation. API: POST https://apps.usefulweb.site/api/v1/tools/twinworks-queue-formulas/calculate

## Workflows