Should you build your own posterly?
Social scheduler for 18 platforms built agent-first: an MCP server and API let AI agents draft, learn your voice, and post directly
A basic compose-queue-publish loop against open-API networks (Mastodon, Bluesky, Telegram) is a weekend build, same as any scheduler. What's specific to posterly and harder to fake is the agent-native layer: an MCP server exposing tools like generate_captions, get_learned_voice, and find_available_slot so a coding agent can draft and post on your behalf, plus a voice model that's actually learned from your posting history and its own performance data rather than a one-off few-shot prompt. Add Google Business Profile review management, per-platform video transcoding, and client approval workflows for agencies, and the moat is upkeep and depth, not the initial compose/publish loop.
ENOriginal research content in English. Original prompt preserved in English.
Build me a personal social scheduler an AI agent can drive, to replace posterly. Requirements:
- Node + Express + better-sqlite3, with both a localhost compose page and
a small local HTTP API (list_slots, create_post, get_recent_posts) so a
coding agent can call it directly instead of only a human using the UI.
- Three open-API targets: Mastodon (access token), Bluesky (app password
via @atproto/api), and a Telegram channel (bot token). One adapter file
per network so a fourth is addable later.
- A /caption endpoint: given a topic, call an LLM API (key in .env) with
my last ~20 published posts as style examples, so drafts sound like me
instead of a generic AI voice. Cache the examples so it's not refetching
the DB on every call.
- Slot-based queue: posting times per weekday in my timezone, new posts
fill the next free slot, or pin an exact datetime; duplicate a post
across networks with per-network text.
- A node-cron tick every minute publishes due posts, marks each row sent
or failed before sending (no double-posts), retries failures 3 times.
- Attached images in media/ next to the database, resized per network
with sharp; a history page of the last 100 sent posts linking out.
- Runs on my always-on box; localhost only, no accounts, no telemetry.
- Out of scope: Instagram, LinkedIn, TikTok, Facebook, and Google Business
Profile (approval-gated APIs, say so in the README), review management,
client approvals, video transcoding, and analytics.
- README: getting a Mastodon token, a Bluesky app password, a Telegram
bot token, and pointing a coding agent at the local API.The prompt opens pre-filled in your agent. Review it before running.
What would building your own look like?
A local API and compose queue that publishes to open-API networks on a schedule, with a caption endpoint an agent can call directly instead of a UI-only AI button.
What you will need
- OAuth/API access per social network
- always-on box for the scheduler
- database
- media storage
- LLM API key for caption generation
Anyone can wire an LLM to a caption box; keeping a voice model current against real engagement data, holding pre-approved OAuth apps for the platforms that gate access behind business verification, and exposing a stable MCP/API surface an agent can drive reliably are all ongoing work, not a one-time build. Agencies additionally pay for the client-review layer, which needs its own auth and approval state machine.
x18 maintained platform integrations, including approval-gated ones (Instagram, LinkedIn, TikTok, Facebook, Google Business Profile)
xa voice model trained on your actual post history and what performed well, not a static prompt template
xGoogle Business Profile review replies and photo management
xclient approval portal and content-plan review for agencies managing multiple brands
xper-platform video/image transcoding tuned to each network's limits
xa hosted MCP server + REST API built for agents, not bolted on after the fact
How much does posterly cost?
- Monthly billing
- $15/mo$15/mo
- Per year
- $180/yr$180/yr
- Annual billing
- $144/yr20% cheaper than paying monthly
- On a Brazilian card, with 3.5% IOF
- R$78.39/moR$753/yr
Saved to My list. You will see a notice on this site when the price changes.
You complete the purchase on posterly’s site. Vibe Radar does not handle payments.
| Plan | Monthly | Annual (per month) | What is included |
|---|---|---|---|
| starter | $7≈ $7 | $5.58≈ $5.58 | 5 connected social accounts, 1 seat, 1 brand, 0 link-in-bio pages, 300 AI credits/month |
| pro | $15≈ $15 | $12≈ $12 | 12 connected social accounts, 3 seats, 5 brands, 5 link-in-bio pages, 800 AI credits/month |
Free tierno free tier
Billing termsmonthly + annual; 7-day trial and 7-day money-back guarantee
Additional costsThe MCP/API is a separate $3/month add-on; the Agency API is $29/month. X publishing can require separately priced X capacity because of X API costs.
verified 2026-10-20 · source ↗
Is it cheaper to build or buy posterly?
Adjust the numbers: hours to build, your hourly rate, running costs and the subscription price.
Over 24 months, subscribing is cheaper.
Starting hours estimated from the analysis (multi-day). Does not price what you give up (support, integrations, security).
Can I rebuild posterly?
Kinda. The core of posterly is buildable in a weekend with the prompt on this page, but there are real gaps: 18 maintained platform integrations, including approval-gated ones (Instagram, LinkedIn, TikTok, Facebook, Google Business Profile), a voice model trained on your actual post history and what performed well, not a static prompt template. Read the honest list above before committing.
How much does posterly cost?
posterly costs about $15/mo (Pro, checked 10/20/2026), which is $144 per year.
What do I lose by replacing posterly?
Honestly: 18 maintained platform integrations, including approval-gated ones (Instagram, LinkedIn, TikTok, Facebook, Google Business Profile); a voice model trained on your actual post history and what performed well, not a static prompt template; Google Business Profile review replies and photo management; client approval portal and content-plan review for agencies managing multiple brands; per-platform video/image transcoding tuned to each network's limits; a hosted MCP server + REST API built for agents, not bolted on after the fact. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to posterly?
Yes: Postiz (Open-source social scheduler, self-hostable, covers much of the DIY core for open-API networks.). Using prior art is also vibecoding; the prompt is for when you want it exactly your way.