Comparison
Choose Buffer if you write your own posts, want a free plan, or post to Instagram, TikTok or YouTube. Choose Quibr if you want each newsletter edition turned into posts for X, LinkedIn, Threads and Facebook without writing them. Buffer is a scheduler: it can show your newsletter’s latest editions through an RSS feed, but you write and queue every post. Quibr is an agent: it reads each new edition, writes the posts in your voice, schedules them across the week and publishes them, for $29 a month. I build Quibr, so weigh that, and check Buffer’s own pages, which I read on 15 October 2026.
Disclosure: I am Vicente Évora, the founder of Quibr (formerly Letterly). Every Buffer price, channel and feature here comes from Buffer’s own pages, read on 15 October 2026, and each one is linked in the sources. Buffer changes its plans from time to time, so check its pricing page on the day you decide.
Buffer is a social media scheduler. You write a post, pick a time, and Buffer publishes it. Quibr is an AI social media agent for newsletter creators. It reads each new edition from your RSS feed, writes posts from it in your own voice, and schedules and publishes them across the week.
Buffer is the bigger and older company. It started as a project in November 2010, and on 15 October 2026 its about page listed 83,468 customers. Quibr was founded in November 2024 by one person, me, and more than 380 newsletter creators have signed up.
| Quibr | Buffer | |
|---|---|---|
| What it is | An AI agent for newsletter creators | A scheduler for posts you write |
| Starts from | Each new edition in your RSS feed, picked up within about 30 minutes | Posts you write. Its content feeds show your newsletter’s latest articles when you open Buffer |
| Who writes the posts | Quibr, against posts you have already published, with a persona for each platform | You, with help from its AI Assistant if you want it |
| Publishes to | X, LinkedIn, Threads and Facebook Pages | 12 channels, including X, LinkedIn, Threads, Facebook, Instagram, TikTok and YouTube |
| Price | $29 a month, one plan | Free for 3 channels, then $5 or $10 a month per channel |
| Free to try | A free plan with one full agent run, no card to sign up, and a seven-day trial | A free plan, and a 14-day trial of the paid plans |
| Control | Manual, Light Touch (a 1 to 24 hour window to step in) or Full Auto, with an emergency stop | Each post goes out when you schedule it |
Buffer charges per channel, and Quibr charges one flat price. For one to three channels, Buffer costs less. For all four of the platforms Quibr covers, Buffer’s Essentials plan comes to $20 a month and Quibr to $29 a month, with the writing done for you.
| Channels | Buffer Free | Buffer Essentials | Buffer Team | Quibr |
|---|---|---|---|---|
| 1 | $0 | $5 a month | $10 a month | $29 a month |
| 2 | $0 | $10 a month | $20 a month | $29 a month |
| 3 | $0 | $15 a month | $30 a month | $29 a month |
| 4: X, LinkedIn, Threads and Facebook | Not possible: the free plan connects 3 | $20 a month | $40 a month | $29 a month |
Buffer’s free plan allows 10 scheduled posts per channel at a time. Its paid plans have a 14-day free trial, and its FAQ says annual billing costs less. Quibr is billed monthly with no contract, with a seven-day free trial and a free plan that includes one full agent run on your latest edition.
Buffer covers more platforms. Its pricing page lists 12 channels: X, LinkedIn, Threads, Facebook, Instagram, TikTok, Bluesky, Mastodon, YouTube, Pinterest, Google Business Profile and Substack.
Quibr covers four: X, including X Communities, and LinkedIn, Threads and Facebook Pages. Threads reuses your X posts, and Facebook posts go to a Page, not a personal profile. If your readers are on Instagram, TikTok or YouTube, Quibr does not post there.
Your newsletter goes out as usual.
Open the content feed that holds your newsletter and find the new edition.
Press Create Post and write it, with the AI Assistant if you like. Repeat for every post and every channel.
Pick a time for each one, and Buffer publishes them.
Your newsletter goes out as usual.
Within about 30 minutes, from your RSS feed.
Posts in your voice, spread across the following days.
Approve every post, step in during the window, or let them go. Quibr emails you when the run finishes.
Buffer is the better choice in these cases:
Quibr is the better choice in these cases:
The trade-offs. Quibr has no Instagram, TikTok or YouTube, it needs a newsletter with an RSS feed to start from, and one person builds it.
Yes. They do different jobs. One way to split them: Quibr turns each edition into posts for X and LinkedIn, and Buffer schedules the posts you make by hand for Instagram or TikTok.
If one account ends up in both tools, keep an eye on how often it posts, so the two queues do not crowd it.
This is my own calendar for one week in September 2026, when Quibr was still called Letterly. It holds the posts the agent scheduled from one edition, across X, LinkedIn, Threads and Facebook, all published.
“Been using Letterly lately and it's nice not having to think about that part anymore.”
For a measured example, the full test run shows the settings, the posts and what one edition brought back. To see how Buffer compares with seven other tools, read the buyer’s shortlist.
For newsletter creators, yes. Buffer schedules posts you write, and Quibr writes the posts from your newsletter, then schedules and publishes them. If you mainly want to schedule posts you write yourself, Buffer is the simpler fit.
Buffer’s content feeds can show your newsletter’s latest editions, but you create each post yourself. Its help page does not describe posting new feed items automatically.
For one to three channels, yes: Buffer’s free plan connects 3, and Essentials is $5 a month per channel. For X, LinkedIn, Threads and Facebook together, Buffer Essentials is $20 a month and Quibr is $29, and Quibr writes the posts.
No. Quibr posts to X, LinkedIn, Threads and Facebook Pages. Buffer covers Instagram, TikTok and YouTube.
Any newsletter with an RSS feed, including beehiiv, Substack, Ghost, Kit and Mailchimp.
Yes. On Manual you approve every post, and on Light Touch you get a window of 1 to 24 hours to step in. Only Full Auto publishes without asking.
Founder of Quibr
Vicente writes Notes to 10K MRR, a weekly build-in-public newsletter on beehiiv, alongside university and a part-time job. Every edition went out on time, and the social posts that were supposed to follow it never did.
He built Quibr to write those posts for him. It started as an idea on 26 November 2024, and the first version shipped in January 2025. Quibr is built and run by one person, and Vicente answers support email himself.
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