About

In the algorithmic landscape of social media, the metadata of your content - the caption - is as critical as the creative asset itself. This tool is not merely a counter; it is a pre-flight compliance engine for digital marketers. It ensures your copy lands the "hook" before the truncation point (the dreaded "Read More"), adheres to strict API character limits, and maintains an optimal readability score.

Platform algorithms prioritize dwell time and engagement. Captions that are cut off mid-sentence or stuffed with irrelevant hashtags trigger negative heuristic signals. By analyzing L (Length), S (Sentiment), and R (Readability), this tool provides a quantitative framework for qualitative writing.

Formulas

We utilize the Flesch-Kincaid Grade Level algorithm to determine the readability of your caption. A lower score indicates higher accessibility for a general audience.

{

Score = 0.39total wordstotal sentences + 11.8total syllablestotal words − 15.59

Sentiment is calculated using a lexicon-based polarity scoring system:

{

S_total = n∑i=0 val(w_i)where w is a token found in the dictionary.

Reference Data

Platform	Max Characters	Truncation (Approx)	Max Hashtags	Ideal Length (Rec.)
Twitter / X	280 (Standard)	N/A	N/A	70-100 chars
Instagram	2,200	125 chars	30	138-150 chars
LinkedIn	3,000	210 chars	N/A	25 words
Facebook	63,206	477 chars	N/A	40-80 chars
TikTok	2,200	65 chars (varies)	30+	150 chars
Pinterest	500	N/A	20	200 chars
YouTube Shorts	100	N/A	15	Title optimized

Frequently Asked Questions

The truncation point is not fixed by character count alone; it is determined by the rendering engine of the app (iOS vs. Android) and the user's screen width. However, 125 characters for Instagram and 210 for LinkedIn are the safe zones accepted by industry standards to ensure your "hook" remains visible.

Yes. On Instagram, keywords in the caption text are now indexed for search, whereas previously only hashtags were. Placing key hashtags in the sentence flow (semantic placement) is better for searchability, while "blocks" of hashtags at the end serve categorization.

High-arousal emotions (both positive and negative) drive sharing. A neutral score (close to 0) often indicates a flat, informative tone that may lack the emotional trigger required for viral engagement.

Stop words are common fillers like "and", "the", "is". A high ratio implies fluff. Lowering this ratio makes your copy punchier and more information-dense, which is crucial for short-attention-span feeds.