Free tool for cold email
Paste a subject line and a cold email to check its length, opening, ask and links, the words that can look like spam, leftover template tokens and the way to say no. Free, with no account, and nothing leaves your browser.
The checks run in your browser. What you paste never leaves your device, and nothing is kept.
Plain code, not a model: the same answer every time, and why.
Words before the sign-off. Istos keeps first emails under 130.
Length, capitals, promotional words, and a fake “Re:” or “Fwd:”.
Merge tags and placeholders such as {{first_name}}, [Name] or <company>.
Warm-ups such as “I hope this email finds you well” or “My name is”.
How many sentences are about you (I, we, our) and how many about them (you, your).
Questions and calls to action. More than one ask is flagged.
More than one link, shortened links, and files mentioned.
A short list of promotional words, runs of exclamation marks, capitals and money signs.
A plain line that lets them opt out without reaching for the spam button.
The Leads agent writes each first email short, about one thing, with one ask and an opt-out line. Every draft waits in your queue, and nothing sends until you approve it.
Each check is plain code, not a model, so it gives the same answer every time and says why. It reads words, not intent, so a good email can still trip one, and a bad one can pass. The full guide, with a worked example: How to write a first email a founder will answer.