Free tools
Five things you can do here without an account
Some of what postfast does needs no login, no server and no sign-up — so it runs in your browser instead. Nothing you paste into any of these leaves the page.
Publish Guard
Paste a post, pick the networks, and see every reason it would be rejected.
Open the toolCharacter counter
One count, measured against all seven networks’ limits at the same time.
Open the toolThread splitter
Turn a long piece of writing into a thread that fits, split at sentence boundaries.
Open the toolX API cost calculator
What X actually charges to publish a post — and why a link costs twenty times more.
Open the toolUTM builder
Build a tagged campaign URL without hand-editing a query string.
Open the tool
Common questions
- Do these tools send my text anywhere?
- No. Every one of them runs entirely in your browser. There is no request to postfast’s API, nothing is stored, and nothing is logged.
- Do I need an account to use them?
- No. There is nothing to sign up for and no limit on how often you use them.
- Are these the same checks postfast uses internally?
- The post checker and the X cost calculator are, literally — they import the same shared modules the product’s composer and billing meter use, so they cannot drift from what postfast actually does.
The tools are the small half
postfast composes, schedules and publishes to seven networks, and tells you what will fail before it does. Join the waitlist for early access.