How to Cross-Post to Bluesky and Mastodon (4 Tools That Work)
If you're active on both Bluesky and Mastodon, you already know the pain. Two separate apps. Two separate logins. Writing the same post twice. Checking two notification feeds.
Bluesky has crossed 40 million users. Mastodon has over 15 million registered accounts across thousands of instances. More people are on both. And if you add Threads to the mix, you're juggling three separate platforms before you even touch X or LinkedIn.
Cross-posting solves this. Write once, publish to all your platforms from one dashboard.
I tested every tool that supports both Bluesky and Mastodon. Four of them actually handle it well. Here's how cross-posting works and which tool fits different setups.
What Is Cross-Posting?
Cross-posting means publishing the same content to multiple social media platforms at once. Instead of opening Bluesky, writing a post, then opening Mastodon, writing the same thing again, you do it once from a single tool.
The good cross-posting tools let you customize per platform. Same core message, but adjusted for each audience. This matters because Bluesky and Mastodon have different character limits, different cultures, and different expectations.
Why Cross-Post to Bluesky and Mastodon?
Both platforms are growing fast, but their audiences barely overlap.
Bluesky attracts people leaving X. It has a familiar Twitter-like feel, algorithmic feeds, and a younger, tech-forward audience. Mastodon draws people who want decentralized, ad-free social media. The culture is more deliberate, longer-form, and community-driven.
If you're building an audience, you want both. But managing them separately is a time sink.
The math is simple. If you post 5 times per week on each platform, that's 10 separate posts to write, schedule, and track. With cross-posting, it's 5 posts that go to both. That's hours saved every week.
How to Cross-Post to Bluesky and Mastodon
Step 1: Pick a tool that supports both
Not every scheduling tool works with Bluesky and Mastodon. Many mainstream tools still don't support either platform. You need one that connects to both APIs.
These four do: OmniSocials, Fedica, Buffer, and Publer.
If you also want Threads, Instagram, LinkedIn, and X in the same tool, your options narrow further. OmniSocials covers all of them.
Step 2: Connect your accounts
For Bluesky: go to Settings > Privacy and Security > App Passwords. Create an app password and paste it into your scheduling tool along with your handle. Full Bluesky setup guide.
For Mastodon: enter your instance URL (like mastodon.social or fosstodon.org) and authorize through the OAuth flow. Works with any instance. Full Mastodon setup guide.
Both connections take about 2 minutes each.
Step 3: Write your post and select platforms
Compose your post in the editor. Check both Bluesky and Mastodon as target platforms. Most tools show a live preview for each platform so you can see how it looks before publishing.
Step 4: Customize per platform (do this)
This is the step most people skip. Don't.
Bluesky and Mastodon have different expectations:
| Bluesky | Mastodon | |
|---|---|---|
| Character limit | 300 | 500 (often higher) |
| Hashtags | Rarely used | Commonly used, important for discovery |
| Content warnings | Not a feature | Expected for sensitive topics |
| Tone | Casual, witty, Twitter-like | Thoughtful, community-oriented |
| Links | Preview cards work well | Some instances don't auto-preview |
Good cross-posting tools let you edit the Mastodon version and Bluesky version separately before publishing. Use this. A 280-character Bluesky post is fine. But Mastodon's audience appreciates the extra space.
Step 5: Schedule or publish
Set a date and time, or publish immediately. The tool sends the post to both platforms within seconds of each other.
For scheduling tips specific to each platform, see the Bluesky scheduling guide and Mastodon scheduling guide.
4 Best Tools for Cross-Posting to Bluesky and Mastodon
#1 - OmniSocials
OmniSocials is the only tool I tested that handles Bluesky, Mastodon, and Threads plus 8 mainstream platforms for one flat price. $10/mo. No per-channel fees.
The cross-posting experience is the best of the four. You write your post once, then switch between platform previews to customize each version. The editor shows you character counts, image requirements, and formatting differences per platform in real time.
What really helps is the unified inbox. After you cross-post, replies come in from Bluesky, Mastodon, Threads, and everywhere else in one stream. No tab-switching.
Key Features
- 11 platforms from one dashboard (Bluesky, Mastodon, Threads, X, LinkedIn, Instagram, Facebook, Pinterest, TikTok, YouTube, Google Business)
- Per-platform customization with live previews
- Unified inbox for all replies and mentions
- Calendar view to see everything scheduled across platforms
- Media library with Pexels and Unsplash built in
Pros
- Flat $10/mo covers everything, no per-channel pricing
- Best cross-posting UX across emerging + mainstream platforms
- Fast, clean interface
- 14-day free trial, no credit card
Cons
- Newer product, smaller user community
- No platform-specific analytics dashboards yet (general post analytics available)
- Mobile app is web-based, not native
Pricing
$10/mo (annual) or $12/mo (monthly). 14-day free trial.
#2 - Fedica
Fedica understands the fediverse better than any other tool. If Bluesky and Mastodon are your primary platforms, Fedica's analytics are unmatched.
Their free plan includes cross-posting between Bluesky, Mastodon, and X. The paid plans add deeper analytics: instance-level reach on Mastodon, follower growth tracking, and best-time-to-post suggestions based on your actual audience activity.
The downside is the interface. It's packed with analytics options and can feel overwhelming at first. But once you find your workflow, it's powerful.
Key Features
- Fediverse-native analytics with instance-level insights
- Free plan with scheduling and basic cross-posting
- Best time to post calculated from your follower data
- Audience demographics across connected platforms
- Thread creation for Bluesky and Mastodon
Pros
- Best free option for Bluesky + Mastodon cross-posting
- Deepest fediverse analytics available
- Understands platform-specific concepts (instances, federation, boosts)
- Active development on decentralized platform features
Cons
- Cluttered UI with steep learning curve
- Fewer mainstream platforms than OmniSocials
- No unified inbox
- Some features locked behind $30/mo plan
Pricing
Free plan available. Pro starts at $10/mo. Business at $30/mo.
#3 - Buffer
Buffer is the simplest option. If you want to cross-post to Bluesky and Mastodon without learning a complex tool, Buffer gets it done.
The free plan gives you 3 channels and 10 scheduled posts per channel. Enough for light cross-posting. The paid plan removes limits but charges per channel. That's where it gets expensive. Bluesky + Mastodon + Threads + X = 4 channels at $6 each = $24/mo.
Buffer doesn't understand platform differences. No content warnings for Mastodon, no character limit adjustments, no per-platform preview. You write one post and it goes everywhere identically.
Key Features
- Clean, minimal UI that anyone can use
- Free plan for 3 channels
- AI assistant for caption suggestions
- Start Page link-in-bio builder
- Basic analytics on paid plans
Pros
- Fastest to set up and learn
- Free plan is usable for basic cross-posting
- Reliable publishing across both platforms
- Good mobile app
Cons
- Per-channel pricing adds up fast ($6/channel/mo)
- No per-platform content customization
- No fediverse-specific features
- Identical post goes to all platforms. No differentiation.
Pricing
Free (3 channels, 10 posts each). Paid starts at $6/channel/mo.
#4 - Publer
Publer supports Bluesky and Mastodon cross-posting with a focus on bulk content.
The standout feature is CSV import. If you've got a spreadsheet of posts for the month, upload it and Publer schedules everything across both platforms at once. The content recycling feature re-queues top performers automatically.
The interface isn't as polished as the others. The platform customization options are limited. But for the price, the bulk features are hard to beat.
Key Features
- Bulk scheduling from CSV or batch upload
- Content recycling for evergreen posts
- Auto-scheduling with suggested times
- Workspaces for managing multiple brands
- Browser extension for quick cross-posting from any page
Pros
- Affordable at $12/mo
- Bulk scheduling is a real time-saver
- Free plan with 3 accounts
- Content recycling works well for consistent posting
Cons
- Dated interface
- Limited per-platform customization
- No social inbox
- Bluesky and Mastodon support feels secondary to mainstream platforms
Pricing
Free (3 accounts). Professional at $12/mo. Business at $21/mo.
Cross-Posting Tips for Bluesky and Mastodon
Don't post identical content
This is the single biggest mistake. Mastodon users can tell when a post was written for Twitter/X. Bluesky users don't care about Mastodon-style hashtags. Each platform has its own norms.
At minimum, adjust hashtags and length. Ideally, rephrase for each audience.
Use Bluesky for engagement, Mastodon for community
Bluesky's algorithm surfaces content to new audiences. Mastodon's chronological timeline means your existing followers see everything but discovery is harder.
Post your most shareable content on Bluesky. Post your most community-oriented content on Mastodon. Cross-post the stuff that works on both.
Add Threads to the mix
If you're already cross-posting to Bluesky and Mastodon, adding Threads is almost free effort. Same post, one more checkbox. Threads has over 300 million monthly active users and growing fast.
OmniSocials covers all three. Fedica and Buffer support Threads too.
Schedule during active hours per platform
Each platform has different peak times. Bluesky tends to be active during US working hours. Mastodon activity depends heavily on which instance you're on and the geographic distribution of its users.
The best approach is to schedule slightly different times for each platform rather than posting to both simultaneously.
Track what works where
The same post often performs very differently on Bluesky vs Mastodon. A hot take might get 50 reposts on Bluesky and crickets on Mastodon. A long, thoughtful thread might do the opposite.
Use your scheduling tool's analytics (or the platform's native analytics) to understand which content works where. Then lean into those patterns.
Quick Comparison Table
| Feature | OmniSocials | Fedica | Buffer | Publer |
|---|---|---|---|---|
| Bluesky support | Yes | Yes | Yes | Yes |
| Mastodon support | Yes | Yes | Yes | Yes |
| Threads support | Yes | Yes | Yes | No |
| Per-platform editing | Yes | Limited | No | Limited |
| Unified inbox | Yes | No | No | No |
| Free plan | 14-day trial | Yes | Yes (3 channels) | Yes (3 accounts) |
| Price for all platforms | $10/mo flat | $10-30/mo | $6/channel/mo | $12/mo |
| Total platforms | 11 | 6 | 8 | 9 |
| Bulk scheduling | No | No | No | Yes |
So, Which Tool Should You Use?
If you're on Bluesky + Mastodon + other platforms, OmniSocials gives you the most platforms for the lowest price. $10/mo flat for 11 platforms with per-platform customization.
If you're fediverse-first and analytics matter, Fedica is the pick. Best free plan for Bluesky and Mastodon, and the analytics go deeper than anything else.
If you want the simplest setup and don't mind paying per channel, Buffer works. Just know that the per-channel pricing adds up.
If you schedule bulk content (30+ posts at a time), Publer's CSV upload saves real time.
For most people managing multiple platforms, the combination of cross-posting with per-platform customization is what matters most. That's where OmniSocials and Fedica pull ahead.
Frequently Asked Questions
Can you cross-post from Bluesky to Mastodon?
Not natively. Bluesky and Mastodon are separate networks with no built-in cross-posting. You need a third-party tool like OmniSocials, Fedica, or Buffer to publish to both platforms from one place.
Is there a tool that supports Bluesky, Mastodon, and Threads?
Yes. OmniSocials supports all three platforms plus 8 others for $10/mo flat. You can write one post and publish it to Bluesky, Mastodon, Threads, X, LinkedIn, Instagram, and more simultaneously.
Should I post the same content on Bluesky and Mastodon?
You can, but customizing for each platform works better. Mastodon users prefer longer, thoughtful posts and expect content warnings. Bluesky has a 300-character limit and a more casual tone. Most cross-posting tools let you adjust the content per platform before publishing.
What is cross-posting on social media?
Cross-posting means publishing the same (or similar) content to multiple social media platforms at once. Instead of writing a post on Bluesky, then rewriting it for Mastodon, you compose it once and send it everywhere from a single tool.
Is cross-posting bad for engagement?
Identical cross-posting can hurt engagement because each platform has different norms and audience expectations. But cross-posting with per-platform customization works well. Adjust the tone, length, and hashtags for each platform while keeping the core message the same.
