Transform the bookmarks you've saved, the notes you've written, and the ideas you've captured into polished content worth sharing. AI handles the heavy lifting while your voice stays authentically yours.
One-time purchase. $99 — No recurring fees, ever.
You've saved hundreds of articles, videos, and posts. But when was the last time you actually found and used one? Browser bookmarks are flat lists with no context, no search, and no way to surface what matters when you need it.
Postiller captures more than just links. Our Safari extension extracts the content, generates summaries, and creates searchable embeddings—all on your device. Every bookmark becomes part of your personal knowledge base, ready to inform your next post.
Auto-extracted content
Full article text, not just the URL
AI-generated summaries
Key insights at a glance
Semantic search
Find by meaning, not just keywords
Your Ideas
Your Hashtags
In the shower. During a meeting. At 2am. You jot them in Notes, forget where you put them, and they never become anything. Postiller gives your fleeting thoughts a permanent home where they can grow into content.
Your hashtags aren't just labels—they're topics you care about. When you generate content, Postiller matches your ideas and bookmarks with relevant hashtags automatically, ensuring your posts reach the right conversations.
Generic AI output is obvious. It's why “LinkedIn voice” has become a punchline. But the problem isn't AI—it's that most tools don't know anything about you.
Postiller lets you create detailed personas that capture your tone, your expertise, your opinions, and even phrases you love (or hate). When you generate content, it draws from your bookmarks and ideas while speaking in your authentic voice.
Professional Voice
LinkedIn, Twitter
Tone
Direct, thoughtful, occasionally contrarian
Expertise
Product strategy, team building, early-stage startups
Avoid
“Excited to announce”, buzzwords, humble brags
Traditional search finds exact matches. Semantic search understands meaning. When you search for “leadership during uncertainty,” Postiller surfaces that article about crisis management, your note about decision fatigue, and the podcast you saved about organizational resilience—even if none contain those exact words.
Search across bookmarks, ideas, and notes simultaneously. Find patterns across everything you've collected.
All semantic processing happens locally. Your search queries and content connections never leave your device.
Generate content informed by relevant sources. The AI draws from your specific knowledge, not generic training data.
Most AI apps work the same way: they take your data, send it to their servers, process it with their API keys, and charge you a subscription. You're paying for convenience while giving up control, privacy, and often paying inflated prices.
Bring Your Own Keys (BYOK) flips this model. You connect your own OpenAI, Anthropic, Google, or xAI API key. Your prompts go directly from your device to the AI provider—no middleman, no markup, no data retention. You pay only for what you use at the provider's standard rates.
Typical AI app subscription
$20-30/month
Your actual API costs
~$1-5/month
Based on typical personal usage
OpenAI
GPT-4o, GPT-4o-mini
Best for nuanced writing and complex reasoning tasks.
Anthropic
Claude Sonnet, Claude Haiku
Excellent at following style guidelines and longer content.
Gemini Pro, Gemini Flash
Fast and cost-effective for everyday content generation.
xAI
Grok
Real-time knowledge and witty, unfiltered responses.
On-Device Models
No API Key RequiredNot every task needs an expensive frontier model. The latest Android and iOS devices ship with foundation models built in. On-device AI handles summarization, embeddings, and organization—completely free, completely private, and available even without an internet connection.
These aren't stripped-down models. They're optimized specifically for mobile hardware, delivering fast results while respecting your privacy. Use them for everyday tasks and save your API keys for when you need the absolute best output.
One price. Forever yours.
$99one-time
Everything you need to create professional content while keeping your data completely private. Buy once, use forever.
Available soon on the App Store
Postiller is built with privacy as the foundation, not an afterthought. Your data never touches our servers—we don't even have servers. The app runs entirely on your device. There are no ads, no usage metrics to monetize, and no “pro” tiers to upsell—you get everything.
Typical AI writing app
$10-20/month subscription
$120-240/yr
Postiller
One-time purchase
$99 forever
Postiller pays for itself in less than a year—then it's free forever.
As AI makes software easier to build and consumption costs continue rising, the subscription model makes less sense than ever. You shouldn't pay rent on software that runs on your own device using your own API keys.
Support independent developers creating tools that help everyone bridge the transition into AI—software that improves lives and helps people unlock their full potential, without extracting monthly fees indefinitely.
Note: AI content generation uses your own API keys. You pay providers directly (OpenAI, Anthropic, Google, xAI) at their standard rates—typically $1-5/month for personal use. On-device features like semantic search are completely free.