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Vibe write your story with Sherpa

The world's most powerful AI story writing partner.

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What if you could talk your way to a great story?
Meet Sherpa by Pocket FM.

Sherpa
IN BETA
1. The Ballroom Answers
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Get detailed feedback and suggestions on your episode before publishing

Showing the Discuss ideas state.

From your first idea to the final draft.
Sherpa takes you the whole way.

You bring the spark

Your starting idea

A woman receives a letter from her mother three days after her funeral.

Sherpa develops it

Ask a stronger question

Who sent the letter and why now?

Find the story world

The trail leads to a hotel her family sealed years ago.

Raise the stakes

Every clue changes what Eleanor remembers about her mother.

Sherpa structures it

Eleanor returns home, follows the letter to an abandoned hotel, and uncovers the pact her mother died protecting.

The final draft takes shape

The letter was postmarked Tuesday. Her mother had been buried on Sunday. Eleanor read the first line again, then reached for the brass key she had sworn never to use.

Purpose-built AI agents
powering every story written with Sherpa.

Planner Agent illustration for Sherpa by Pocket FM
SherpaIN BETA
Select

A second hand appears in the margins of the score, in different ink. Someone else tried to finish this symphony first, and Mira starts looking for what happened to them.

Select

A second hand appears in the margins of the score, in different ink. Someone else tried to finish this symphony first, and Mira starts looking for what happened to them.

  • Planner Agent

Plan long stories across arcs, characters, and episodes.

As your ideas evolve, Sherpa keeps characters, arcs and Episode plans in context, so you can explore new ideas without losing coherence.

Feedback Agent illustration for Sherpa by Pocket FM
100%

In the heart of a forest few dared enter, nestled deep within the folds of forgotten maps, stood a decaying estate called Elder Hollow Manor.

The walls wept dust and the candles lit themselves, and from the depths of the manor the echoes rose behind her.

Review again
  • Feedback Agent

See every draft through the eyes of an editor and your audience.

Sherpa evaluates engagement, readability, prose, coherence, pacing and listener enjoyment, then turns those insights into focused revisions that help you finish every draft.

Storyboard Agent illustration for Sherpa by Pocket FM

Your storyboard

The Crimson Echoes

An archivist follows a fragment of a cursed symphony back to the house that wrote it.

GothicBuilding dread

Story idea

Themes

World & Setting

Tone & Style

Story Characters

Past arcs12Current arc3
  • Storyboard Agent

Keep one source of truth for the life of the story.

Sherpa tracks characters, scenes, arcs, settings and story changes, helping the storyboard stay aligned with your draft.

Introducing,
the Narrative World Model.
Tailormade for writing stories.

Long stories depend on more than remembering names and events. They depend on knowing what has changed, who knows what, and which story threads remain unresolved.

Pocket FM's Narrative World Model (NWM) builds structured memory from finalized chapters. It records characters, relationships, locations, objects and world rules, alongside scenes, narrative beats and plot threads. These records are connected in a temporal knowledge graph that preserves how the story develops, with links to the supporting text.

When a writer asks a question, NWM retrieves relevant evidence from the story up to the selected chapter. It can connect information across chapters, distinguish when an event happened from when it was revealed, and surface changes in character knowledge or relationships. This provides story-grounded context for writing tools without treating future plans as established facts.

Built from your chapters

Turns finalized prose into structured story records, linked to the text that supports them.

Characters and relationships

Tracks character goals, knowledge, status and relationship changes across the story.

World details

Records locations, object ownership and condition, and the rules established within the story world.

Events and revelations

Distinguishes the order of events from the order in which characters and readers learn about them.

Story threads and payoffs

Connects scenes, narrative beats, open plot threads and their later resolutions.

Relevant context across chapters

Assembles evidence from text search and graph retrieval, scoped to chapters available at that point.

Evaluated on questions that connect story details across chapters.

We evaluated NWM on questions about character knowledge, changing relationships, event order and plot developments using NarrativeWorldBench. Each memory system supplied evidence to the same answering model.NWM Graph Retrieval achieved 89.8% accuracy on a private set of 176 cross-chapter questions, compared with 57.4% for Graphiti. On a public set of 576 story questions across 12 books, it achieved 62.5%, compared with 51.6% for Graphiti. Read more about the Narrative World Model.

Sherpa offers top quality with the fewest canon violations.

When each system continued the same book, judges scored story quality and counted contradictions against its established canon.

Quality vs. canon violations
Sherpa is preferred over other harnesses in all comparisons.

When the same blank page assignment was run through seven Claude Code and Codex configurations, blinded pairwise judges compared every output with Sherpa across four craft axes.

Sherpa preference shareSherpaComparisonTies excluded50% is neutral
Sherpa preference share against agentic harnesses
Sherpa vs Codex (GPT-5.6 Terra · medium)
Sherpa vs Claude Code (Sonnet 5 · medium)
Sherpa vs Claude Code (Sonnet 5 · low)
Sherpa vs Codex (GPT-5.6 Terra · low)
Sherpa vs Codex (GPT-5.6 Terra · high)
Sherpa vs Codex (GPT-5.6 Sol · medium)
Sherpa vs Claude Code (Sonnet 5 · high)
Sherpa has a 92% or higher preference share against other story writing products.

When fifteen episodes were written from a blank page, blinded pairwise judges compared Sherpa with Sudowrite and Fabula across short form, narrative craft, AudioCraft and longform.

Sherpa preference shareSherpaComparisonTies excluded50% is neutral
Sherpa preference share against purpose-built story copilots
Sherpa vs Sudowrite
Sherpa vs Fabula

Research results measure story-memory question answering with automatic scoring, not generated-story quality.
The private questions were model-generated and model-adjudicated. See the paper for methods and limitations.

Sherpa by Pocket FM also produces your story into a studio-grade audio drama.

Write your story in one language and localize it for the world.

Sherpa's story localization adapts names, places, idioms and cultural references while keeping characters and storylines consistent from episode to episode. It does more than translate words, and it can narrate the localized draft too.

  • Adapts culture, not just words
  • Keeps characters and relationships in sync
  • Stays consistent across long stories
Interactive globe highlighting localization markets: English, English, Deutsch, हिन्दी, Español, Português, 日本語, 中文. Drag to spin.

Add studio-grade audio narration to every episode you write.

Sherpa's AI audio drama generator helps each line sound right for the moment, rather than reading every sentence in the same flat tone. Turn the draft into expressive narration, then publish as an episode.

  • Expressive delivery for every scene
  • One voice across every episode
  • Clear, natural narration
  • Draft to published episode

What writers say about writing with Sherpa by Pocket FM.

“Sherpa can suggest hooks, plot points, and directions for episodes based on everything that’s already happened. I can workshop ideas with Sherpa, change what doesn’t fit and build on what does until it lines up with my own vision.”
Steven AdeWriter of The System Creation: Intergalactic Entry
Darlene CampbellWriter of My Lovely Intruder
“Sherpa was helpful in giving me ideas for particular characters and was even responsible for inventing and naming a few of them. I especially liked the resources at my fingertips, and my favorite feature was its ability to help me plan at least ten episodes into the future.”
“It is honestly like having an author’s assistant who knows my book almost as well as I do. I use it to find plot holes, forgotten characters, unresolved storylines, and inconsistencies I may have missed.”
Folasewa AdigunWriter of Vanessa’s Revenge
T. LlewellynWriter of God of the Six Elements
“Sherpa makes it easier to maintain consistency across characters and storylines. It still allows me to keep my own voice and creative direction, and the feedback before publishing an episode is very helpful.”
“I had my entire show of over 600k words arranged for me at a glance. On days when I could not come up with more than 500 words, Sherpa helped me write a full episode while mimicking my writing style.”
Juliet AnineWriter of The One He Can’t Break

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Frequently asked questions