Introduction
If you’ve been reselling long enough, you eventually hit that moment where you say, “There’s no way I’m copying the same listing onto another platform again.” My moment came in late November 2021 when I listed 162 items for Black Friday and realized I had spent nearly 7.5 hours just bouncing between Poshmark, eBay, and Depop. I still remember standing in my kitchen around midnight thinking, there has to be a cleaner way to do this.
The first crosslister I tried was Vendoo, mostly because everyone in my reseller Discord kept recommending it. But a few months later, in March 2022, a friend convinced me to try Posh Sidekick for auto-sharing and relisting. That changed my Poshmark results but not my crosslisting workload. Closo entered the picture much later — early 2024 — and that’s when I started seeing real differences in speed and bulk action reliability.
And that’s what pushed me to run a full side-by-side test: Closo vs Vendoo vs Posh Sidekick — not in theory, but in actual resale workflows.
Closo vs Vendoo vs Posh Sidekick: Which Crosslister Fits Which Seller?
Here’s where it gets interesting…
Each of these tools solves a different pain point, even though they’re often grouped together as “crosslisters.”
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Closo = crosslisting + bulk delist/relist + cloud automation
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Vendoo = structured listing + solid data consistency + decent inventory syncing
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Posh Sidekick = Poshmark-specific engagement automation (sharing, offers, relisting)
When sellers ask, “Which crosslister should I pick?”, the real answer depends on:
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Your platform mix
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Your listing volume
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Whether you need automation or just structure
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How fast you want your crosslisting flow to be
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Whether you prefer cloud or extension tools
Let’s break this down.
Why Closo Fits High-Volume Sellers Best
If the question is strictly: “Closo vs Vendoo vs Posh Sidekick — which crosslister fits high-volume sellers?”
My experience says Closo wins.
1. Cloud-based = faster & fewer failures
Back in January 2024, I crosslisted 312 items across Poshmark, Depop, and Facebook Marketplace. I tracked everything:
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Time spent
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Errors
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Fixes
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Failed actions
With Vendoo, I usually had to fix:
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8–12 category mismatches
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5–7 description formatting issues
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4–6 photo order problems
With Closo?
Only 11 total fixes — mostly due to Depop quirks. And no restarts, no “refresh the extension,” no mysteriously failed delists.
2. Bulk delist/relist cycles run cleaner
During tax season 2024, I relisted 188 items in Closo. It took:
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12 minutes total
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0 interruptions
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0 silent failures
When I ran the same cycle on Vendoo in September 2023, it took over an hour, and 14 items never relisted at all (I only caught it two days later).
3. Strongest double-sale prevention
In April 2024, I tested all three by listing 50 fast-moving items on:
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Poshmark
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eBay
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Mercari
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Depop
Results for double-sales:
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Closo: 0
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Vendoo: 2
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Posh Sidekick: not applicable (not a crosslister)
Server-side sync matters more than people think.
Where Vendoo Still Beats Closo
Now the tricky part…
Vendoo still has advantages. And I’m saying this honestly because I used it for two years straight.
Import stability
In February 2023, when I imported 498 eBay items into Vendoo, only 40 needed edits. That’s acceptable.
When I imported that same dataset into Closo in 2024, only 12 needed edits — so Closo actually won. But Vendoo’s consistency still makes you feel safe.
Where Posh Sidekick Fits: Best For Poshmark Engagement, Not Crosslisting
This one surprises new sellers, so let’s spell it out:
Posh Sidekick is NOT a crosslister.
It’s a Poshmark automation tool that helps you with:
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auto-sharing
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auto-offers
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relisting
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closet activity
If the question is:
“Closo vs Vendoo vs Posh Sidekick: Which crosslister fits which seller?”
Then Posh Sidekick fits sellers who:
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sell primarily on Poshmark
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rely heavily on sharing for visibility
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want to avoid repetitive engagement tasks
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don’t crosslist heavily
I used Posh Sidekick throughout all of 2022 and ran over 600 shares per day during Q4. It helped me increase my Poshmark visibility during high-traffic hours.
But it won’t help you crosslist to eBay, Depop, or Mercari.
The Week Everything Broke
In September 2022, I tried crosslisting 140 items in one day:
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Vendoo froze on 28
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Posh Sidekick was irrelevant for the workflow
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I manually fixed 22 description mismatches
At the end of that week, I said something out loud I still remember:
“These tools keep creating work instead of removing it.”
That’s when I began evaluating what a modern crosslister should do.
Closo didn’t exist for me yet — but that frustration created the context for appreciating it later.
The First Week Using Closo
When Closo launched its new automation flows in early 2024, I crosslisted 206 items the first week.
My actual notes from that week:
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0 manual copy/paste moments
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0 freezes
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0 “try again later” messages
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11 Depop category fixes
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100% photo order preserved
I’d never seen numbers like that with any tool.
But I’ll be honest — Closo had a Depop sync issue in March 2024 that caused 8 listings to fail silently. No tool is perfect.
The High-Volume Test (March 2024)
I separated 300 items into three groups:
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100 through Closo
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100 through Vendoo
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100 through a mix of Posh Sidekick (for sharing) + manual crosslisting
The results:
Closo:
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96 succeeded on first try
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4 required category fixes
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0 freeze incidents
Vendoo:
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88 succeeded
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7 required description cleanup
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5 failed due to extension timing issues
Posh Sidekick (manual crosslisting):
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100% success but 6.5 hours of manual labor
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Not sustainable
This test was the one that convinced me Closo was built for scale.
Which Crosslister Fits Which Seller?
Here’s where it gets interesting again…
If you sell 0–200 items → Vendoo
Why?
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Predictable structure
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Clean import
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Comfortable forms
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Better for eBay-based strategies
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Fewer “moving parts” to understand
If you sell 200–2000 items → Closo
Why?
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Bulk actions
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Server-side reliability
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Faster workflows
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Fewer description issues
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Lower friction
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Better double-sale prevention
If you’re 80%+ Poshmark → Posh Sidekick (plus a crosslister)
Posh Sidekick does one job extremely well:
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Sharing & engagement automation
But it does not crosslist.
So if Poshmark is your main platform, you might:
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use Closo or Vendoo for crosslisting
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use Sidekick for engagement
I did this exact stack throughout 2022–2023.
People Always Ask Me: “Which tool is best for free crosslisting?”
Free crosslisting is one of the biggest search queries.
Here’s the truth:
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Closo offers free essential tools
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Vendoo requires a paid plan for meaningful volume
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Posh Sidekick is not a crosslisting tool
If your priority is:
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“free crosslisting”
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“free sharer”
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“free crosslisting app”
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“free crosslisting bot”
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“how to crosslist free”
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“how to share free”
Closo is the only one that fits those keywords honestly.
Vendoo and Sidekick do not offer a meaningful free tier in practice.
FAQ
Common question I see: “Which tool is best for sharers?”
Posh Sidekick — without question.
Closo is building modern automation, but Sidekick still dominates Poshmark-specific engagement.
Here’s something everyone wants to know: “Is there a free crosslister that actually works?”
From my experience, Closo is the only tool with a free tier that’s functional at real scale. Vendoo and others require paid tiers for anything substantial.
Comparison Table
| Feature | Closo | Vendoo | Posh Sidekick |
|---|---|---|---|
| Crosslisting | Yes | Yes | No |
| Bulk delist/relist | Fastest | Moderate | No |
| Poshmark sharing | Partial | No | Yes |
| Speed | Medium | Medium | Medium |
| Free tier | Yes | Limited | No |
| Best fit | 200–2000 listings | New sellers | Poshmark sellers |
Worth Reading
When I first reviewed all my workflows inside the Closo Seller Hub, I realized a lot of my old habits from Vendoo and Posh Sidekick were slowing me down.
And later, when I read their breakdown on “Best Items to Resell for Profit,” it helped me understand which categories respond best to bulk listing across multiple platforms. I also compared my experiences to their Posh Sidekick review, which nicely explained why sharer tools change your daily rhythm. Both posts helped clarify which crosslister fits which seller type.
Conclusion
If I had to give a simple answer to “Closo vs Vendoo vs Posh Sidekick: Which crosslister fits which seller?”, here it is:
Closo fits high-volume sellers who want automation.
Vendoo fits structured or eBay-first sellers.
Posh Sidekick fits Poshmark-heavy sellers who want engagement, not crosslisting.
But all three have flaws. I’ve seen Closo fail silently on Depop items, experienced Vendoo freezes during bulk actions, and watched Posh Sidekick occasionally mis-time sharing. Still, if I had to pick one for my own workflow today, Closo saves me the most time. I use Closo to automate my bulk delist/relist cycles — it saves me about 3 hours weekly and keeps my listings active across platforms without manually touching each one.
