Chasing Mastery public platform

Build the practice experience your community wishes existed.

Turn any measurable pursuit into purposeful practice, trustworthy progress, an engaging stream, and a story worth sharing—without asking the platform for a private escape hatch.

Build with your agent See how Darts works
Public SDK only Human + agent ready Portable across web and mobile
VERTICAL CAPABILITY STACKMake the work measurable—and memorable.
LIVE
VERIFIED STORY EVENTPersonal best · 42.8 seconds

Anchored to capture at 00:18:43.220

+ Rank
packagestory.emit("personal_best")
Proven by the demanding Darts reference
8Darts Practice Modes
2input paths, one truth
0ambient package grants
1public boundary for everyone
Choose your boundary

Start with what you need to own.

Packages own meaning. Connectors observe the outside world. Complete verticals compose both into one deliberate member and creator experience.

01
Portable experience

Build a Practice Mode

Own the rules, player, Measurements, progression, Story Events, and overlays. Exercise the real package in Workbench before a member ever installs it.

  • Deterministic activity engine
  • Rich iframe + WebView player
  • Immutable, comparable releases
Explore packages
02
Automatic evidence

Connect a real source

Translate a device, game, browser, service, or specialist tool into exact observations through a separately reviewed zero-grant Station sidecar.

  • Exact observation identity
  • Local health and recovery
  • Fixtures through Connector Lab
Explore connectors
03
Deep vertical

Build the whole stack

Combine a natural Pursuit, several useful modes, automatic evidence, progression, creator presentation, and acceptance into the best companion for one community.

  • Darts-class capability map
  • Domain Kit reuse
  • Creator and community story
Study the blueprint
The rule that keeps everything possible

Your experience owns meaning.
The host owns authority.

Darts gets no private privileges. Every official experience crosses the same typed, versioned, revocable boundary available to you.

Your package owns meaningPortable, deterministic, immutable
  • Rules and activity state
  • Measurements and progression
  • Manual player and overlay
  • Story, coordination, narration policy
Typed public boundaryNo ambient authority
The host owns authorityTrusted, recoverable, revocable
  • Identity and authorization
  • Clocks and persistence
  • Devices, Station, OBS and media
  • Routing, retries and recovery
Understand the trust model
Beyond a generic metric form

A vertical is a deep capability stack.

Supporting a pursuit means understanding how serious practitioners train and telling the story of that work—not adding a category label to a timer.

Build a vertical
  1. 01
    DiscoveryPursuit + Library listing + Experience Suite
  2. 02
    PracticeSeveral useful modes + honest Attempt boundaries
  3. 03
    EvidenceManual input + one near-zero-effort automatic path
  4. 04
    ProgressComparable Measurements + ranks + Sprint finish lines
  5. 05
    PresentationPlayer + overlay + semantic Story Events
  6. 06
    CreatorOBS anchors + narration + sealed production evidence
  7. 07
    ProofFixtures + conformance + cross-surface acceptance
The demanding reference

If the public platform can express Darts, it can express your vertical.

Darts Core combines eight modes, a shared rules kit, a rich board, manual and AutoDarts input, corrections, progression, Story Events, overlays, multiplayer, narration, OBS anchoring, and creator evidence—without importing the kernel.

Rich playerAutomatic inputCorrection + replayShared-board matchesNarrationCreator timeline
Trace every capability
BUILT FOR MODERN AUTHORS

Describe the experience. Let your agent learn the boundary.

Codex, ChatGPT, and Claude use the same Chasing Mastery skills, durable brief, pinned local toolchain, Workbench loop, conformance gates, and release handoff. Change providers without changing the product you are building.

Chasing Mastery Author · new activity
› Build a chess Puzzle Rush Practice Mode with a responsive board, accuracy and pace progression, Story Events for streaks and personal bests, and a stream overlay.

I’ll begin by defining the Attempt boundary and evidence model.Then I’ll scaffold a standalone package and open the real artifact in Workbench.

One public platform. Any measurable pursuit.

Build something worth practicing.

Start with the mental model, leave with tested immutable package bytes.

Read the five-minute guide Browse the SDK