Play it now: https://taylor-software.github.io/juice/ — free, no account, your campaigns stay on your device.

A cross-platform (iOS / Android / web / desktop) Flutter app implementing the Juice solo-RPG oracle by jrruethe — Fate Check, all generators (quest, scene, NPC, settlement, wilderness, dungeon, treasure, names, meaning, immersion, plot points, extended NPC tables), plus a persistent campaign journal (your prose, scene dividers with a chaos-factor snapshot, and every roll you choose to keep — searchable, taggable, and exportable as Markdown or a styled standalone HTML page for sharing) with threads tracking and flexible, system-agnostic character sheets (free-text stats, current/max tracks with steppers, tags, notes — one model covers D&D, Ironsworn, or Mythic NPCs). An encounter tracker runs initiative order (drag to override), turns and rounds, status tags, and defeated states — combatants pulled from your characters share their sheet's HP track live — and drops an end-of-encounter summary into the journal. A Maps tool draws your dungeon room-by-room as you roll it (pan/zoom, tap a room for its detail, linger rolls) and reveals a wilderness hex map as you travel (env-colored hexes from the same verified drift tables, Lost markers, manual reveal for prep); both persist per campaign and snapshot into the journal.

The Ask-the-Oracle tools also include a generic Roll High oracle — a 7-step likelihood ladder (Almost Certain … Almost Impossible) with six graded answers (Yes, and → No, and), in d100, d20, and 2d6 variants. Each table row is machine-verified for exact dice-range coverage in build_oracle.py.

A general dice roller tool parses full dice notation — NdX, d%, dF (Fate), modifiers, multi-group sums like 2d6+1d8+3, keep/drop (4d6kh3/kl/dh/dl), and d20adv/d20dis — with a per-die breakdown (dropped dice struck through), quick-tap dice chips, session history, and one-tap add-to-journal.

Oracle and dice results land in the journal as structured entries: a summary, the individual roll rows, a one-tap re-roll, and open-in-tool to jump back to the tool that produced them.

• Slash commands: type / in the journal to roll a fate check, dice, or a quick generator without opening a tool — the result lands inline.

• Campaign header: a collapsible band over the journal shows the current scene, Mythic chaos, pinned threads, starred characters, and crawl state — each opens its tool. Set the campaign's default oracle here.

• Oracle interpreter (on-device AI, optional): any oracle result in the journal can be expanded into four short readings — literal, symbolic, complication, foreshadow — by a small language model that runs entirely on your device (WebGPU in the browser; arm64 on mobile). One-time model download (~670 MB web / ~480 MB mobile) after explicit consent; nothing you write leaves your device. The dice stay authoritative — the model only suggests, you decide. Readings can draw on the most relevant earlier journal entries, retrieved on device, so interpretations remember your campaign's people and places. Set your campaign's genre and tone from the sheet to steer the voice. Web uses Gemma 3 1B (Google, Gemma license); mobile uses Qwen3 0.6B (Alibaba, Apache 2.0). Mobile builds target arm64 (Android) and iOS 16+.

Also includes Mythic GME support (Fate Chart with Chaos Factor dial, Scene Test, Event Focus rolling against your tracked Threads/Characters lists, and all 47 Meaning Tables). Mythic Game Master Emulator © Word Mill Games, content used under CC-BY-NC 4.0 — this app is free and non-commercial.

A Party toolkit begins with Behavior Tables — all thirteen Triple-O spark and specific d66 tables (© Cezar Capacle / Critical Kit, CC-BY-SA 4.0) for deciding what characters do, with the zine's spark combos (Action + Focus, Action + Method, Action + Motivation) and one-tap add-to-journal. The Party Emulator runs the Triple-O check itself: name the Obvious / Option / Odd (or let dice assign a group's three courses), then roll a d6 — or Double-Down with 2d6 and keep your favorite. Doubles grow the behavior into a character Trait, adding a new tag or marking an existing one prominent on the character sheet. PET procedures complete the emulator: each character keeps an Agenda, a Focus, and tokens — ACT rolls the agenda with a coin (the Ask as written or inverted) plus a modifier die (as written / inverted / exaggerated) and grants a token on an agenda match, spending a personality tag yields two readings, and session start deals a fresh Focus, a real-life event, and a clean slate of tags. Sidekick Dialogue gives characters words: 2d6 lines keyed to a persisted mood (doubles change the mood first), tone/topic/said-how chips, and a 19-hex conversation hexflower that walks between history and current events with a me/you/us priority die — and any rolled line can be voiced into a full in-character utterance by the on-device interpreter.

Optional Ironsworn family rulesets (toggle in the app-bar tune icon): moves browser with action/progress rolls, and all oracle tables drawn from official Datasworn data (© Shawn Tomkin). All four titles are supported:

• Ironsworn (CC-BY 4.0)
• Ironsworn: Delve — expansion; folds into the Ironsworn Moves tool (CC-BY 4.0)
• Ironsworn: Starforged (CC-BY 4.0)
• Starforged: Sundered Isles — expansion; folds into the Starforged Moves tool (CC-BY-NC-SA 4.0)

Ironsworn and Starforged are separate game families and are mutually exclusive; enabling one family turns the other off. Expansions require their base game and are disabled automatically when their base is turned off.

An in-app Help tool (in the launcher, plus a "?" on every tool's header) covers every tool with a user guide, gives a quick-reference summary of each supported system, and ends in a credits page listing all content licenses — with Flutter's package-license viewer one tap away.

Oracle content: github.com/jrruethe/juice, CC BY-NC-SA. This app is an unofficial implementation of those tables. Party emulator content: Triple-O © Cezar Capacle / Critical Kit, CC-BY-SA 4.0 (the derived table data in assets/emulator_data.json stays CC-BY-SA 4.0); PET & Sidekick © Tam H (hedonic.ink), CC-BY 4.0.

Live app: https://taylor-software.github.io/juice/

This repo ships the source that matters (lib/, assets/, test/, pubspec.yaml). The platform runner folders (android/, ios/, web/, macos/, windows/, linux/) are not committed — generate them once:

cd juice_oracle
flutter create .          # regenerates platform folders; keeps lib/, pubspec, assets
flutter pub get
flutter run               # pick a device, or: flutter run -d chrome / -d macos

flutter create . is non-destructive to your lib/, pubspec.yaml, and assets/ — it only fills in the missing platform scaffolding.

flutter analyze          # should be clean
flutter test             # engine + widget tests
python3 build_oracle.py  # re-runs the engine verification, re-emits the asset

build_oracle.py is the source of truth for the table data and the engine logic. It checks the Fate Check against the PDF's documented table and the designed probabilities (≈50% yes-like, 5.56% Random Event, 5.56% Invalid Assumption under Normal; ≈66.6% yes-like under Likely), then writes oracle_data.json. The Dart engine mirrors it and is re-checked by test/fate_engine_test.dart.

lib/
  engine/      dice, models, oracle data loader, Oracle (fate check + generators)
  state/       Riverpod providers (oracle loader + persisted journal/threads/characters)
  features/    fate / generators / tables / tracker screens
  shared/      theme, result card, home shell (journal + tool launcher), tool host/registry
assets/oracle_data.json   all tables, generated by build_oracle.py

Every table is data-driven: one JSON asset + a generic roller. Adding or correcting a table is data entry, not new widgets.

I can't compile Flutter in my build environment (no SDK / no pub.dev access), so criteria 1 is the one piece left for your machine. Items 2–5 are verified by code + tests here.

A few tables in the PDF are visual or OCR-ambiguous. These are implemented as best-effort and should be checked against the original before you rely on them:

• Wilderness Monster Encounter grid / NPC Dialog grid — encoded and verified against the PDF (see build_oracle.py verify sections 6–7).
• Name generator skew pattern — the source uses a per-row skew pattern over the syllable columns; here each column is rolled independently (d20) and concatenated. Names are plausible but not the exact weighted distribution.
• Abstract Icons — implemented: all 60 icons (CC BY-NC-SA 4.0 per the official itch.io release) vendored under assets/abstract_icons/, rolled as 1d10 row + 1d6 column from the Names & Details tool.
• Location compass grid — implemented: 1d100 onto the 5×5 compass grid, formula verified against the PDF's cell ranges (build_oracle.py verify section 11), rolled from the Exploration tool.

If you want any of these brought to full fidelity, point me at the relevant PDF page and I'll encode it and add a verification.