1. Create Your Account
- Go to app.postmimic.app and click "Sign Up"
- Enter your email and password
- Check your inbox for a verification email and click the link
- You start with 5 free AI-generated posts — no credit card required
2. Connect Your Platforms
- From the dashboard, go to Settings → Credentials
- Click "Connect" next to the platform you want to set up
- Supported platforms: X (Twitter), LinkedIn, Facebook, Instagram
- You'll be redirected to the platform to authorize PostMimic
- Once connected, you can publish directly from PostMimic
Note: Facebook personal timeline posting is not supported (Meta removed the API in 2018). You can post to Facebook Pages you manage.
3. Train Your Voice
- Go to the Voice tab
- Option A: Connect your X account and PostMimic will analyze your tweet history automatically
- Option B: Upload a
tweets.jsfile from your X data export (Settings → Your Account → Download an archive of your data on x.com) - PostMimic analyzes thousands of your real posts to build a voice fingerprint capturing your vocabulary, sentence structure, tone, and perspective
- Voice training takes a few minutes depending on how many posts you have
- You can retrain anytime if your style evolves
4. Generate Your First Post
- Go to the Post tab
- Select a topic or let PostMimic suggest one based on trending topics and your interests
- Choose your AI source:
- Cloud AI — uses our servers, counts against your monthly post limit (DeepSeek by default, fast and cheap)
- Your Own API Keys (BYOK) — enter keys from DeepSeek, OpenAI, Anthropic, or xAI in Settings. You pay the provider directly.
- Local AI (Ollama) — runs on your computer's GPU. Free, private, unlimited. Requires Ollama installed (see Download page for setup).
- Click "Generate" and review the result
- Edit if you want, or approve it as-is
- Click "Publish" to post it to your connected platform
5. Set Up a Schedule
- Go to the Schedules tab
- Create a new schedule: pick a platform, set days and times, choose a timezone
- PostMimic will auto-generate and publish posts on your schedule
- Cloud scheduling works even when your computer is off (requires a paid subscription)
- You can review upcoming posts in the Queue tab before they go live
6. Brand Rules Pro & Agency
- Go to Brand Rules in the sidebar
- Set your role/title, tone range, and content guidelines
- Add forbidden topics — PostMimic will never generate content about these
- Add alliance and endorsement rules for political campaigns
- Enable factual constraints (never invent statistics, never quote anyone, etc.)
- Brand rules are injected into every generation to keep content on-brand and compliant
7. Desktop App vs Web Portal
Web Portal
Works in any browser, including iPad Safari. Best for quick generation, schedule management, and on-the-go approvals.
app.postmimic.app →Desktop App
Full-powered app with local AI support (Ollama), offline drafting, and advanced configuration. Available for Windows, Mac (Apple Silicon), and Mac (Intel).
Download →Both connect to the same account — your profiles, schedules, and settings sync between them.
Getting the Best Voice Clone
Your voice clone is only as good as the training data you give it. Here's how to get the best results:
- More data = better voice. 500 posts gives a decent voice. 2000+ posts gives an excellent one. If your voice sounds generic, you probably need more training data.
- Use your real posts, not polished writing. Upload your actual tweets, LinkedIn posts, and Facebook updates — typos, slang, and all. The AI needs to see how you ACTUALLY write, not how you think you should write.
- Retrain after significant changes. If your writing style has evolved, retrain your voice. You can retrain anytime from the Voice tab.
- Use the "About You" field. Go to Voice settings and fill out the "About You" section. Tell PostMimic who you are, what you do, and what you care about. This context shapes every post it generates.
- Set your "Topics to Avoid." If the AI keeps generating content about topics you'd never talk about, add them to the "Topics to Avoid" list in Voice settings.
If Your Posts Sound Robotic or Generic
- Check your voice training. Go to Voice — is it trained? How many posts? If it says "untrained" or has fewer than 100 posts, that's the problem. Upload more data or scan your X account.
- Fill out "About You." A voice clone without context is just copying sentence patterns. Tell it your perspective, your industry, your opinions. This is what makes posts sound like YOU and not like a generic AI.
- Try different engagement strategies. "Informative" produces safer, more generic output. Try "Hot Takes" or "Authentic" for more personality. The strategy controls the ENERGY of the post while your voice controls the STYLE.
- Edit and regenerate. If a post doesn't sound right, don't just publish it. Hit Regenerate to get a different take on the same topic. Or edit it to match your voice better — the AI learns from the patterns, but your final touch makes it yours.
- Check your brand rules. Overly restrictive brand rules can make output sound corporate. If every post sounds like a press release, try loosening the tone range or disabling "content purpose required."
Getting the Best Results Per Platform
X (Twitter)
- Keep it punchy. The best X posts are strong opinions in 1-3 sentences.
- Use the "Hot Takes" or "Ragebait" strategy for engagement.
- Don't force hashtags — PostMimic doesn't add them by default, which is correct for X.
- LinkedIn rewards longer, more thoughtful posts. Aim for 600-1500 characters.
- Use paragraph breaks — walls of text get scrolled past.
- The "Authentic" or "Discussion" strategy works best for LinkedIn.
- Facebook is more casual and community-oriented.
- Questions and personal observations drive engagement.
- Captions should complement the visual content.
- Hashtags matter more on Instagram than other platforms.
Scheduling Tips
- Consistency > frequency. 1 post per day every day beats 5 posts on Monday and nothing until Friday. Set a realistic schedule you can maintain.
- Use jitter. The jitter setting adds a random offset to your posting time so you don't post at exactly 9:00 AM every day. This looks more natural.
- Review your queue. Check the Queue tab regularly. Review scheduled posts before they go live — catch anything that doesn't sound right.
- Time zones matter. Post when your audience is active. For US audiences: 8-10 AM and 5-7 PM in their time zone. The schedule builder lets you set the time zone.
Common Issues
"Failed to generate" error
- Check your internet connection
- If using cloud AI: you may have hit your monthly post limit. Check Dashboard for usage.
- If using Ollama: make sure Ollama is running (open terminal, run
ollama list)
"No X account connected" error
- Go to Settings → Connected Accounts
- Click "Connect X" and complete the OAuth flow
- Make sure the credential is assigned to your active profile
Posts not publishing on schedule
- Cloud scheduling requires a paid subscription (Starter or higher)
- Check that the schedule is set to "Active" (not paused)
- Check that you have a platform credential assigned to the profile
Voice sounds nothing like me
- Upload more training data (aim for 500+ posts)
- Fill out the "About You" section in Voice settings
- Make sure you're using your OWN posts, not someone else's content
Can't log in
- Check your email for the verification link
- Try "Forgot Password" to reset
- Contact support at postmimic.app/support
Need Help?
Submit a support ticket
postmimic.app/support
We respond within 24 hours. Choose a category that best fits your issue:
- Billing & Subscription — payment issues, plan changes, refunds
- Bug Report — something's broken or not working as expected
- Content Quality — posts don't sound right, voice issues
- Setup & Getting Started — help connecting accounts, configuring settings
Documentation
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Blog
postmimic.app/blog — tips, tutorials, and product updates