What is Ghosti? The in-compose AI agent for Twitter, explained (2026)

How we researched this. Everything below comes from the vendor’s own pricing page, documentation and public product pages, read first-hand on the date shown. We have not used the product ourselves, so there is no hands-on testing in this review.

What is Ghosti?

Ghosti is a Chrome extension at ghostiapp.com that adds an AI writing agent, branded “Boo,” directly into Twitter. It drafts tweets, replies, threads, and meme captions inside the compose box in a style you configure during a short onboarding. It is draft-only (you always send posts yourself), bring-your-own-key (you supply your own AI provider API key), and Twitter-only today. It is an early-stage product.

Ghosti’s pitch is an “all-in-one social growth agent” that lives where you already write, inside Twitter, rather than in a separate dashboard. Its defining choices are three: it drafts but never posts for you, it never connects to your Twitter account (no OAuth), and it runs on your own AI API key instead of hosted inference. Those choices shape everything about who it fits. This explainer covers what it does, how its voice setup works, the BYOK pricing, the honest state of its reviews, and where it sits against the field.

Ghosti’s homepage pitches it as an all-in-one social growth agent that works inside Twitter. Captured 21 October 2026 from ghostiapp.com.

Who Ghosti is for

Ghosti fits a Twitter-native writer who wants help drafting without leaving the timeline, and who is comfortable managing an AI provider API key to keep costs low. Its build-in-public leanings show: it has a feature that reads a GitHub repo’s recent commits and turns them into posts, so indie hackers and developers are a natural audience. It is a poor fit if you want scheduling, analytics, LinkedIn, a hosted setup with no keys to manage, or a visible signal that a draft actually sounds like you. It is Chromium-desktop-only, so there is no mobile or Firefox/Safari option.

How Ghosti’s voice setup works

During onboarding you set a personality, tone, and writing style, plus your topics, products, examples, and rules. You can also name several creators as “voice inspiration,” and Ghosti blends them into a hybrid style. That is a useful on-ramp for someone who has not yet found their own voice. It is worth being precise about the mechanism, though: this is a style you configure and can borrow from other accounts, rather than a model trained on an automated read of your own posting history (the site does not claim to ingest your past tweets). And Ghosti shows no per-draft voice check, so there is no visible read of how closely a given draft matches you. You trust the setup and edit by feel.

Ghosti’s features

• In-compose writing: Generate Posts, Polish (cleans up a rough draft you typed), and Remix (rewrites a tweet keeping its hook, with Normal and Creative modes), all inside the Twitter composer.

• Reply Guy: reads a tweet’s context and drafts an in-voice reply in one click (you still send it).

• Thread Generator and Thread Remixer: turn a topic into a multi-part thread, or reshape an existing one.

• News Posts: scans fresh headlines in your niche, picks an angle, and drafts a reaction.

• Meme Replies: pairs a meme image from your own meme bank with an AI-written caption. (No AI image generation; it captions existing images.)

• GitHub Tweets: connects to a repo, reads recent commits, and writes build-in-public posts.

• Hunt Mode and a gamified “Boo” agent that earns XP for each action and evolves through nine stages, which is engagement gamification rather than audience analytics.

Two things to know about posture. First, the good part: Ghosti is deliberately draft-only and never asks for your Twitter login or OAuth, which is a real safety contrast with tools that auto-post or automate replies. Second, a fairness note on its privacy copy: Ghosti says nothing leaves your browser, but because it is BYOK, your drafts are by definition sent to whichever AI provider you configured, using your key. That is normal for any AI writer, but the “no data sent anywhere” phrasing overstates it. The claim that is literally true is the narrower one: Ghosti does not take your Twitter account access or route through its own servers.

Ghosti pricing (2026)

Ghosti has two costs: its own subscription, and the AI provider usage you pay for separately because it is BYOK. The subscription is $18.99/mo (a promo price against a listed $24.99) after a 7-day trial, or $49.99/year, which the site frames as early access limited to 50 keys. A $199.99 lifetime “Web3 NFT” plan is listed as coming soon, not yet purchasable. There is no permanent free tier. On top of that, you bring your own API key from one of the major AI providers and pay them directly; Ghosti estimates around $5/mo for roughly 1,000 generations. One caveat: all of these prices are on the vendor’s own page only, with no third-party listing to corroborate them, so confirm the current numbers at ghostiapp.com before you subscribe.

Ghosti’s pricing section on 21 October 2026. The prices in this section match it. Source: ghostiapp.com.

Ghosti pricing (vendor-stated only, on top of your own AI API costs; verify at ghostiapp.com).

A note on how early Ghosti is

Be clear-eyed here. Ghosti has no verifiable third-party reviews: nothing on G2, Capterra, Trustpilot, Product Hunt, or the main AI-tool directories. Its Chrome Web Store listing (“Ghosti X - Twitter AI Agent”) showed a version dated mid-2026 with a single five-star review and only a handful of users at the time we checked, and its own pricing page uses scarcity framing (“only 50 keys”). No maker, team, or company is named on the site. The blog is active with recent posts, so this reads as a genuinely new, low-traction product rather than an abandoned one, but you are backing something unproven. Note too that “Ghosti” collides with several unrelated names (the Ghost publishing platform, Ghostery, various “ghostwriter” tools, and an unrelated ghosti.ai business assistant), so any rating you find elsewhere is probably not this product. The honest read: judge Ghosti on the trial and your own results, not on reviews, because there effectively are none yet.

Strengths and limitations

Where Ghosti is strong

• In-compose UX: it drafts where you already write, with no copy-paste from a separate dashboard.

• Safety posture: draft-only and no OAuth or account access, a real contrast with auto-posting tools.

• Cheap to run at volume: BYOK means generation cost is roughly $5/mo for ~1,000 posts, paid to your provider.

• Nice build-in-public touches: the GitHub-commit-to-post feature and meme captioning are genuinely handy for indie hackers.

Where Ghosti is thin

• Twitter-only (Reddit and LinkedIn are marked coming soon, not shipped), and Chromium-desktop-only.

• No per-draft voice check, so you cannot see how closely a draft matches you; the voice is a configured style, not a model of your own history.

• No scheduling and no analytics; it is a writing assistant, not a publishing suite.

• Very early with no independent validation, an unnamed maker, and vendor-only pricing (plus the friction of managing your own API key).

Ghosti vs VoiceMoat, and alternatives

We build VoiceMoat, so treat this as biased but honest. The two share one real value: both keep a human on every send rather than auto-posting, which is the safe posture on Twitter. From there they diverge. Ghosti’s voice is a style you configure and can borrow from other creators, with no visible match read, and it runs on your own AI key, Twitter-only. VoiceMoat trains on your own posts (separately for Twitter and for LinkedIn), shows a visible Style and Stance check on your drafts (how many of your writing habits it matches), and is hosted, so there are no API keys to manage. VoiceMoat also adds scheduling, live analytics, and a Media Studio for carousels and quote cards. If you want a cheap, in-compose Twitter drafting agent and you are happy managing a key, Ghosti is a reasonable pick. If you want a voice you can verify across both Twitter and LinkedIn without wiring up your own model access, VoiceMoat fits better. Judge both on your own writing.

For the wider field, see the best Twitter tools in 2026 and the best Twitter tools of 2026.

Is Ghosti worth it?

If you write mostly on Twitter, like drafting inside the composer, and do not mind bringing your own AI key, Ghosti is worth a look, and the 7-day trial is the way to test it. Weigh the caveats honestly: it is Twitter-only, Chromium-desktop-only, brand-new with no independent reviews and an unnamed maker, its pricing is vendor-only with a coming-soon lifetime plan, and its voice is a configured style with no visible match read. If you want a verifiable voice across both Twitter and LinkedIn, hosted with no keys to manage, compare it against a two-platform tool like VoiceMoat first, and judge both on your own writing.