What is Sherpa by Pocket FM?

Sherpa by Pocket FM is a free AI fiction writing tool that helps anyone turn ideas into stories. You describe the story you want and Sherpa helps you plan the arcs, draft the episodes and pressure-test the writing. Finished stories can be produced into audio, localized and published to the Pocket FM audience.

What is vibe writing?

Vibe writing is creating a story by describing it in conversation instead of drafting from a blank page. You talk through the idea, characters and world and an AI writing partner turns that conversation into structured episodes. The term follows vibe coding. Sherpa is built for vibe writing long-form fiction.

Yes. Sherpa by Pocket FM is free to use. Most AI writing tools charge a monthly subscription. Sherpa doesn't because Pocket FM earns when a story finds its audience rather than when a Writer sits down to write.

How is Sherpa different from asking ChatGPT to write a story?

General-purpose chat models lose track of a story after a handful of episodes. Characters drift, established facts contradict each other and the plot loses its thread. Sherpa runs on the Narrative World Model, which holds the whole story in memory, so every character, arc, rule and setup stays consistent whether you're on episode five or episode five hundred.

What is a Narrative World Model?

A Narrative World Model is the story memory that Sherpa builds as you write. It holds the characters, the arcs, the timeline, the rules of the world and the causal links between events, so the story stays coherent across hundreds of episodes. It is built by Pocket FM and backed by published research.

Do I need writing experience to use Sherpa?

No. Sherpa was built to remove the blank page, which is the biggest barrier for first-time Writers. If you can describe the story you want to read, you can write it. Sherpa handles the structure, continuity and pacing craft that usually takes years to learn.

What happens to a story after I write it?

A story written with Sherpa can be produced end to end on Pocket FM. Sherpa turns episodes into studio-grade audio narration, localizes the story into other languages through cultural transposition rather than literal translation and publishes it to the Pocket FM listener base. Most writing tools stop at the draft.

Is Sherpa related to Sherpa.ai or the Sherpa travel app?

No. Sherpa by Pocket FM is an AI Story writing tool built by Pocket FM, the audio storytelling platform. It is unrelated to other companies and products using the Sherpa name.

Sherpa by Pocket FM | Free AI Fiction Writing Tool

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

Sherpa

IN BETA

1. The Ballroom Answers

100%

Get detailed feedback and suggestions on your episode before publishing

From a spark of an 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.

Meet the AI intelligence
behind 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.

Maps arcs, character journeys, conflicts and episode beats against the full story context, so every new idea has somewhere coherent to go.

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.

Evaluates engagement, readability, prose, coherence, pacing and genuine enjoyment, then turns that reading into precise revisions that help you become a Writer who finishes.

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 Characters

Past arcs12Current arc3

Storyboard Agent

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

Tracks every character, setting, arc, scene and decision across thousands of drafts and episodes, evolving continuously instead of resetting with each prompt.

All of this wrapped together
by the Narrative World Model, the story memory built by Pocket FM.

Total story memory

No story bible to maintain: your spark, notes and episodes stay connected. Sherpa can trace a detail back to where it first mattered.

Character continuity

Characters act on what they have lived, learned and been told. Their motives and relationships evolve with real story memory.

Causal structure

Setups, payoffs and consequences stay visible across the entire story. The Narrative World Model keeps them alive between episodes.

Canon protection

Sherpa catches clashes before they become contradictions.

Narrative coherence

Plot, characters, themes and world stay connected. The Narrative World Model keeps your story coherent as it evolves.

Grounded intelligence

Sherpa works from your material, not invented canon, whatever genre you write in. It distinguishes a story truth from a new possibility it is suggesting.

The Narrative World
Model
outperforms
general-purpose AI.

Read the research

Built from 1,204 continuation tests spanning 38 series, NarrativeWorldBench measures nine dimensions of story structure. It tests horizons up to 200 episodes, where general-purpose AI increasingly loses narrative state. Sherpa's internal model instead maintains a structured, continuously updated world state for characters, events and unresolved arcs. That is why it held coherence where 21 leading standard models declined. Read more.

Leads long horizon coherence by 19 points

Two hundred episodes in, Sherpa holds 0.84 on plot beat F1. Frontier models fall to 0.65 and below.

Plot beat F1 · Higher is better

0.84

Sherpa

0.65

o3

0.575

Opus 4.5

Leads cultural fidelity by 23 to 26 points

Native judges scored Sherpa at least 0.78 in every language, compared with 0.52 to 0.61 for the baseline.

Native judge score · Higher is better

0.840.61

Hindi

0.790.54

Tamil

0.800.55

Telugu

0.780.52

Marathi

Writers prefer Sherpa in 62% to 71% of comparisons

Twelve professional writers chose Sherpa over every baseline across 240 blind sessions.

Win rate · Higher is better

71%29%

Opus 4.5

68%32%

GPT 5

62%38%

o3

Matched quality at a fraction of the cost

Sherpa runs at $0.85 per million output tokens, versus $3.40 to $76.50 for frontier models.

Cost per 1M tokens · Log scale

$0.85

Sherpa

$3.40

o3

$76.50

Opus 4.5

State-of-the-art story writing research
powering Sherpa.

Princeton
Michigan

From Personas to Plot: Character Grounded Multi Agent Story Generation for Long Form Narratives

Published August 25, 2026

UIUC

More Context Is Not Validation: A Baseline First Audit of Action Grounded LLM Listener Agents

Published July 30, 2026

EMNLP 2026

Adaptation, Not Translation: An Architecture and Evaluation Framework for Long Form Cross Cultural Story Localization

Published June 16, 2026

Published at ICML 2026

Expressive Hindi Audiobook Generation with CLAP Based Retrieval

Published May 26, 2026

Under review, ICML

NarrativeWorldBench: A Frontier Saturated Benchmark and a Latent World Model for Long Horizon Co Creative Audio Drama

Published May 7, 2026

Under review, ICML

Improving Hindi Audiobook Generation with Inference Time Interventions

Published May 5, 2026

That's not all. Sherpa also produces
your story into a studio-grade audio drama.

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

Sherpa's 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

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

Sherpa's text to speech model 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

Stories written with Sherpa.
From around the world.

Brahmyodha: The Destroyer

Vidyut, a boy with hidden powers, must master a divine chakra system and fight enemies determined to keep him from fulfilling his destiny.

Ajit Kumar

214.2M plays

Twists of Love & Revenge

A disinherited designer enters a marriage of convenience to reclaim her legacy, then gets pulled into elite family feuds, manipulation, and revenge.

Venu Reddy

87.8M plays

Her Secret Twins

Six years ago, Cassandra fled with a secret. Now, the powerful father of her twins has found her, forcing a reckoning over family, love, and revenge.

Oyindamola Aduke

60.5M plays

Owen & Liam

Owen and Liam fight for love in a world shaped by power, secrets, and generational conflict, where every choice threatens the bond between them.

Desiree Nephus

23.8M plays

Princess Ebony & the Silver Dragon

Princess Ebony defies her royal family and bonds with a legendary silver dragon, uncovering a secret powerful enough to shatter her kingdom.

EJWalker

9.7M plays

The System Creation: Intergalactic Entry

A pizza delivery driver receives godlike system powers two years early and must rebuild civilization before Earth faces intergalactic judgment.

Steven Ade

7.5M plays

What writers say about writing with Sherpa.

“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

Start writing your story
with Sherpa

Get started

Vibe write your story with Sherpa

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

From a spark of an idea to the final draft.
Sherpa takes you the whole way.

Meet the AI intelligence
behind every story written with Sherpa.

Plan long stories across arcs, characters, and episodes.

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

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