PostIdentity, an AI that writes in your voice
Details
- External ID
- 45899381
- Source
- HN
- Company
- —
- Product
- PostIdentity, an AI that writes in your voice
- Website domain
- postidentity.com
- Launched
- Nov. 12, 2025
- Cohort
- —
- Upvotes
- 6
- Upvotes percentile
- 0.27074235807860264
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:25 p.m.
- Updated at
- Sept. 7, 2026, 9:25 p.m.
Description
I built PostIdentity because I was tired of rewriting the same idea for different platforms in different tones. On X I needed something short and casual. On LinkedIn it had to be longer and more formal. I spent more time polishing tone than writing.PostIdentity is a web app that learns how you write and builds AI identities that capture more than just tone. Each identity encodes pacing, intent, and personality to create posts that sound like you or match different styles for brands or clients.Unlike ChatGPT or other AI writing tools, PostIdentity keeps each identity persistent instead of recreating it from a prompt each time. It remembers how you write, the tone you use, and the style of your previous posts, so your output stays consistent. You can also take one idea and generate several versions of it across different identities, for example one for X and another for LinkedIn.You can: - Create multiple identities for different voices or projects - Generate posts instantly using any identity - Refine results to adjust tone or length - Use the Chrome extension to write directly on X and LinkedInSignup is required, but you get an instant demo and 5 free posts when you log in.Demo video (1 min): https://www.youtube.com/watch?v=C9GeT0b4XFEBuilt with React, TypeScript. Uses Supabase, Claude Haiku 4.5 and GPT-5.I’m building this as a side project alongside my full-time job, but I’m putting a lot of hours into it each week. I have plenty of exciting ideas to expand it further and would love to hear what you think could make it more useful, and if you would use this yourself.Happy to answer any questions or share more details if you’re curious.
Enrichment
- Theme
- indie hacker passion projects
- Vertical
- Horizontal
- Function
- Content generation
- Audience
- B2C
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- ai writing in your personal voice
- Manually corrected
- False
Could you build this?
Yes This is a standard LLM-powered SaaS application that takes user writing samples, stores style instructions/few-shot examples in a database, and formats outputs for different social platforms.
Discussion
No comments on this launch.
Competitors
Other products that read as similar to this one — 50 launches clear the similarity bar, closest 8 shown.
Attention rank: #41 of 51 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 5 days after the earliest competitor.
- PostWeavers · ph · 2026-09-22 · 2 upvotes · similarity 0.47
- Ghostwriter · ph · 2026-05-05 · 213 upvotes · similarity 0.39
- Tropes.fyi · hn · 2026-02-20 · 5 upvotes · similarity 0.38
- Dreamwork · hn · 2026-05-07 · 6 upvotes · similarity 0.37
- I built AgentPedia.so for agents to write, debate, and share ideas · hn · 2026-02-11 · 9 upvotes · similarity 0.37
- Postryx AI · ph · 2026-09-08 · 1 upvotes · similarity 0.37
- Posting Machine · ph · 2026-09-12 · 3 upvotes · similarity 0.36
- ReplyME: AI Dating Replies · ph · 2026-09-14 · 2 upvotes · similarity 0.36
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a content generation tool for Government yet.