Saved skills, your tone
Snapshot a successful editing pass as a skill. /scene-rewrite, /one-line-pitch, /punch-it-up — your voice, repeatable.
For writers
Sephir for writers.
Saved skills replace your tone-preset doc. Conversation history stays on your device. Sephir uses your existing ChatGPT or Claude subscription — your editor never sees usage metrics.
What you actually use
Four features you’ll touch every day.
ChatGPT Plus, no double bill
Sign in with the ChatGPT subscription you already pay for. Sephir routes Codex over your session. $0 in extra tokens.
Local conversation history
Drafts, character bios, scene outlines — all stored in your browser. Nothing leaves your device unless you opt in.
Clean Markdown export
Drop the chosen draft into Scrivener, iA Writer, Obsidian, or anywhere that opens .md.
A typical day
Five steps, one prompt.
- 01Sign in to ChatGPT.com in your browser as you normally would.
- 02Open the Sephir sidepanel, choose ChatGPT Plus → OAuth → done.
- 03Use /character or /tone-preset to inject your saved skill.
- 04Iterate on a scene with the multi-turn agent. Audit timeline keeps every revision.
- 05Export the final draft as Markdown to your writing app.
Recommended setup
ChatGPT Plus OAuth for everyday drafting. Anthropic Claude on a BYOK key when you want a second opinion on prose. No need for a second subscription.
Try the agent layer free.
BYOK from day one, ChatGPT Plus OAuth in one click, no credit card required for the 7-day trial of Pro.