Comparison guide
The best tool depends on what you want to stop doing: writing the posts, scheduling them, or opening an app at all. Letterly, an autonomous agent, fits creators who want to hit send and leave social media alone that week. AI post writers such as Contentdrips fit creators who want to approve every post. Taplio fits creators who only post on LinkedIn. DIY automations in n8n or Make fit people who like to tinker. I am the founder of Letterly, so I am on this list, and I scored every tool with the same four filters.
Disclosure: I am Vicente Évora, the founder of Letterly, and Letterly is one of the tools below. I scored it with the same filters as the others and listed its trade-offs. This guide expands my LinkedIn article of the same name, published on 6 October 2026.
This guide is for newsletter creators with roughly 500 to 5,000 subscribers who publish consistently but struggle to stay active on social media.
It suits writers on beehiiv, Substack, Ghost, Kit (formerly ConvertKit) and Mailchimp, and anyone whose newsletter has an RSS feed.
It is not for agencies that run 20 client accounts. It is not for video-first creators either, because almost every tool here starts from text.
The problem is easy to recognise. You hit send on an edition that took six hours to write. Two days later nobody remembers it, and your X and LinkedIn have been quiet all week because the newsletter used up everything you had.
A post on Reddit’s r/Newsletters puts the same problem in numbers: writing the issue feels like 20% of the work, and reformatting the same content for other socials feels like the other 80%. Read the thread.
Turning a newsletter into social posts means taking a published edition and producing several short posts, threads or carousels from it. Each post is formatted for its platform and spread across the week.
One edition usually holds several standalone ideas. Those ideas can fill days of posting, instead of one announcement on send day.
The process has five steps:
A tool reads your newsletter from an RSS feed, a link or pasted text.
The tool finds the standalone points inside the edition.
The tool rewrites each idea for X, LinkedIn or Facebook, ideally in your own voice.
The tool spreads the posts across the following days.
Posts go out on their own, or after you approve them.
The tools in this guide differ mainly in how many of these five steps they do for you.
Newsletter-to-social tools fall into four types, based on who does the work each week. AI post writers convert an article or recording that you give them. Schedulers help you write, queue and analyse your own posts. DIY automations are workflows you wire together in n8n or Make. Autonomous agents watch your newsletter feed, convert each new edition and schedule the posts without you.
| Type | Starts from | What you do each week | Examples in this guide |
|---|---|---|---|
| AI post writer | An article, link or recording you give it | Start each conversion, then review the posts | Contentdrips, Swell AI |
| Scheduler | Posts you write, with AI help | Write, queue and review the posts | Taplio, Hypefury |
| DIY automation | Whatever you wire up | Build it once, then fix it when it breaks | n8n or Make workflows |
| Autonomous agent | Your newsletter’s RSS feed | Nothing, or approve posts if you choose to | Letterly |
The Letterly Four-Filter Test is the method I used to score every tool in this guide, including my own. Each tool gets four yes-or-no questions, asked in this order:
I wrote these filters for the creator I built Letterly for, so Letterly passes all four by design. Weigh that when you read the scorecard, and use the best-for section below if your priorities are different.
| Tool | 1. Starts from your newsletter | 2. Posts to X and LinkedIn | 3. Works hands-off | 4. Under $40 a month |
|---|---|---|---|---|
| Letterly | Yes. RSS feed, link or pasted text. | Yes. Both, plus Threads and Facebook. | Yes. The agent runs on its own. | Yes. $29 a month. |
| Contentdrips | Yes. Paste an article link and it makes carousels. | Partly. LinkedIn and Instagram, with no X. | No. You start each conversion. | Yes. Free, $15 or $26 a month. |
| Taplio | Not listed. Built for writing LinkedIn posts. | Partly. LinkedIn only. | No. You write and queue the posts. | Barely. Plans start at $39 a month. |
| Hypefury | Not listed. It starts from posts you write. | Partly. LinkedIn yes, X no. | No. You write and queue the posts. | Yes. $6 a channel, or $19 for all. |
| Swell AI | No. It starts from audio and video. | No. You copy the posts elsewhere. | No. You upload each recording. | Yes. Free, or $29 a month for 300 minutes. |
| DIY automation | Yes, if you build it that way. | Yes, for the platforms you connect. | Yes, until a step breaks. | It depends. Tool fees plus your time. |
A cell that says “Not listed” means the vendor’s own page does not mention the feature. That is not proof that the feature is missing, so check before you rule a tool out.
The six options differ most on platforms and price. Letterly costs $29 a month and posts to four platforms. Contentdrips costs up to $26 a month and publishes to LinkedIn and Instagram. Taplio starts at $39 a month and is built for LinkedIn. Hypefury costs $6 a channel or $19 for all channels, and it no longer supports X.
| Tool | Type | Posts to | Price |
|---|---|---|---|
| Letterly | Autonomous agent | X, LinkedIn, Threads, Facebook Pages | $29 a month, one plan, with a 7-day free trial |
| Contentdrips | AI post writer | LinkedIn, Instagram | Free, $15 or $26 a month |
| Taplio | Scheduler | From $39 a month, with a 7-day free trial | |
| Hypefury | Scheduler | Instagram, Threads, LinkedIn, Bluesky, TikTok, Mastodon. Not X | $6 a month per channel, or $19 for all channels |
| Swell AI | AI post writer for audio and video | None. You copy the posts elsewhere | Free, $29 or $49 a month, or $8.99 per 60 minutes |
| DIY automation | Automation | Whatever you connect | A tool subscription plus your time |
Hypefury’s own FAQ answers the question “Does Hypefury still support X?” with “Nope! Hypefury no longer supports X”. If X is where your readers are, rule it out first.
The best newsletter-to-social tool changes with your platforms, your budget and how much control you want. No tool here is best for everyone.
| If you want | Look at |
|---|---|
| Your newsletter turned into posts with no weekly work | Letterly, an autonomous agent |
| LinkedIn and Instagram carousels from an article, started by you | Contentdrips |
| A LinkedIn-only growth toolkit | Taplio |
| Cheap scheduling for posts you write yourself, without X | Hypefury |
| Posts from a podcast or video recording | Swell AI |
| Full control, and you enjoy tinkering | A DIY workflow in n8n or Make |
| The lowest cost to try | Contentdrips’ free plan, or Letterly’s free plan with one full agent run |
Best for solo creators who want their newsletter turned into scheduled posts without opening an app each week. Letterly is an AI social media agent that turns every newsletter edition into a week of posts in the writer’s own voice. Here is what it does:
The trade-offs are real. Letterly has no Instagram or TikTok. Threads reuses your X content instead of getting its own writing. Facebook posts go to a Page, not a personal profile. AI image generation is capped at three a day. There is one plan at $29 a month, and one person builds Letterly, so a bug or two may still turn up.
Best for LinkedIn and Instagram carousels from an article you already have, if you are happy to start each conversion yourself. Contentdrips turns a pasted blog link, a topic or a YouTube video into carousels and text posts, and publishes to LinkedIn and Instagram. Its pricing page lists a blog-to-carousel conversion at 15 AI credits.
The trade-off: X is not among its publishing platforms, and every conversion is manual.
Best for creators whose only channel is LinkedIn and who want a full LinkedIn growth toolkit. Taplio describes itself as an all-in-one AI tool to grow your brand on LinkedIn, and its plans start at $39 a month.
The trade-off: Taplio is LinkedIn only, and $39 a month is the highest starting price of the paid tools here.
Best for scheduling posts you write yourself across several channels, cheaply. Hypefury costs $6 a month per channel or $19 a month for all channels. Its FAQ confirms Instagram, LinkedIn and Threads, and its site also lists Bluesky, TikTok and Mastodon.
The trade-off: its pricing page does not describe newsletter import, and its FAQ says it no longer supports X. Check that before you buy.
Best for creators whose source material is a podcast or video recording. Swell AI takes audio, video, podcast episodes and YouTube links, and writes transcripts, show notes, articles, newsletters and social posts from them. Its homepage lists plans at $0, $29 and $49 a month, plus $8.99 per 60 minutes pay as you go.
The trade-off: Swell AI is not built around text newsletters, and it does not publish the posts for you.
Best for creators who enjoy tinkering. A public n8n template by Ramsey Njire, “Transform Gmail newsletters into insightful LinkedIn posts using OpenAI”, reads newsletters in Gmail, picks out the news items with OpenAI, writes LinkedIn posts and publishes them.
The trade-off: you pay for the tools and an OpenAI key, and when a step breaks you are the support team.
I ran one edition of my own newsletter, Notes to 10K MRR, through Letterly’s agent. This is a sample of one, so treat it as a single real run, not a benchmark.
I set the post counts myself: 20 for X, 7 for LinkedIn and 3 for Facebook. Letterly warns that overlap is likely at 20 X posts, and that LinkedIn posts may start to repeat at 7. Push the sliders that far only if your edition has enough in it. Mine did.
Here is what came out:
Over a longer stretch, my newsletter grew by 546 subscribers in the three months to 23 September 2026, while Letterly posted every edition for me. The chart is beehiiv’s own growth graph. It shows all growth, not growth by source, so it does not prove that Letterly caused it.
Twenty beta users ran Letterly before I charged anyone. Two people who use it have also written about it publicly on X. I picked these two quotes myself, so they are not a random sample.
“It's easy, helpful, and the dev is really great at adding features when requested.”
“Been using Letterly lately and it's nice not having to think about that part anymore.”
Letterly costs $29 a month on one plan that includes every feature and all four platforms. The first seven days are free, and the free plan includes one full agent run on your latest edition, so you see real posts before you pay. There is no contract, and you cancel from your settings whenever you want.
Setup takes about ten minutes. You sign up, paste your newsletter’s RSS feed, connect the accounts you want to post to and add a persona.
Letterly checks your feed every 30 minutes, so it picks up a new edition within about half an hour of publishing. It writes the posts straight away and spreads them over the following days, by default up to three a day on X and two a day on LinkedIn.
Letterly emails you when a run finishes, when your queue of posts runs low and when a post fails to publish. Everything else lives in your calendar.
Support comes from the founder. Write to vicente@letterly.pro and I reply within 24 hours.
Turning a newsletter into social posts goes wrong in a few predictable ways. Most of them are avoidable.
Choose by answering three questions, in this order.
If they come from X, LinkedIn, Threads or Facebook, skip the tools built around Instagram and TikTok.
Approving every post points to a writer or scheduler. Letting it run points to an agent.
Cheap tools usually cost you time instead of money.
If an agent fits, start a free trial of Letterly and connect your RSS feed. If a writer or scheduler fits, start from the price and platform table above and open the vendor’s own page.
To go deeper, read how Letterly works and what is in the plan.
Yes. Tools that watch your RSS feed can detect a new edition, write the posts and schedule them. Letterly does this for X, LinkedIn, Threads and Facebook.
It depends on what you want to stop doing. Letterly is built for creators who want it fully hands-off, Contentdrips for creators who start each conversion themselves, Taplio for LinkedIn only, and n8n or Make for people who like to build their own.
X (including X Communities), LinkedIn, Threads and Facebook Pages. Threads reuses your X content, and LinkedIn and Facebook posts are written separately.
Yes. Letterly’s AI composer lets you write a post, generate one from your past posts, or get three angles on a topic. No edition is needed.
Yes. Letterly pulls the images out of your edition and attaches them to the posts they clearly match. A post with no good match goes out without an image.
Letterly builds a persona from posts you have already published, so each post follows your voice. You can edit any post before it goes out, and you should read the first few from any tool before you trust it with your account.
Yes. It works with any newsletter that publishes an RSS feed, including beehiiv, Substack, Ghost, Kit and Mailchimp.
The tools in this guide range from free plans with limits to $39 a month and up. Letterly costs $29 a month on a single plan, with a 7-day free trial.
About ten minutes. You sign up, paste your RSS feed, connect your accounts and add a persona.
Yes. On Manual you approve every post, and on Light Touch you get an approval window of 1 to 24 hours before each post goes out. Only Full Auto publishes without asking.
For newsletter writers who want posts written and published from each edition, yes. If you only post on LinkedIn, Taplio is the better fit. If you mainly want to schedule posts you write yourself, a scheduler is simpler.
I cannot promise a number. Posting consistently gives more people a chance to find you, but results depend on the posts and your audience. My own newsletter grew by 546 subscribers in three months while Letterly posted every edition, and I cannot prove that Letterly caused all of it.
Check which platforms it publishes to today, whether it starts from your newsletter, whether you can approve posts first, whether there is a free plan, and how you cancel. Use the vendor’s own page, because prices and platforms change.
Founder of Letterly
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 Letterly to write those posts for him. It started as an idea on 26 November 2024, and the first version shipped in January 2025. Letterly is built and run by one person, and Vicente answers support email himself.
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