What no tool will do, however much you pay

Short answer. Some of the restrictions are set by the platforms themselves. No scheduler gets around them — not a cheap one, not an expensive one, not an "official partner". If you have run into anything on the list below, changing tools is pointless.

*Checked 28 July 2026. Every statement is backed by a link to platform documentation or to two independent vendors.*

You cannot put a trending sound into a scheduled TikTok video

Buffer: "TikTok's API does not provide access to its full music library". source

Planable: "Because Planable is dependent on the TikTok API, it currently doesn't support adding sounds". source

Two unrelated tools, one reason. A video with sound is published only by hand, in the app.

You cannot mention a person or a company from a personal LinkedIn profile

Buffer: "the LinkedIn API only allows for mentioning from LinkedIn Pages, and you can only mention businesses or individuals who follow that page". source

Planable says the same thing. source

You cannot publish a PNG to Instagram through any tool

Instagram documentation: "JPEG is the only image format supported". source

The Instagram app accepts PNG — through the API no one will let it through.

You cannot go past the daily publishing limit

• Instagram: no more than 100 posts through the API per rolling 24 hours. source
• Threads: no more than 250 posts a day per profile; a carousel counts as one. source

No tool will raise this limit: it sits on the platform's side.

You cannot message someone on LINE who has not added you as a friend

Messages go only to those who have added the official account themselves. source

Broadcasting "to a list" on LINE is impossible in principle.

You cannot set up a Viber bot for free

Since 5 February 2024, bots are created on commercial terms only. source

What is more, a bot is set up from a personal account on a phone — "on behalf of an organisation" will not work.

You cannot show someone else's Threads feed in your own app

Posts obtained through the API may be shown "solely to the person who created it". source

And one that is not obvious: a post no one will see

At Pinterest, on the entry access tier (Trial), the pins and boards you create are "visible only to creator". source

Formally the publishing goes through. In fact only the author sees it. If your tool has not been moved to the Standard tier, there will be no result — and nothing in the list of capabilities reflects this.

What to do about it

See also: the full list of platform limits · why a notification arrives instead of a published post · catalogue index