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A decodable is a text written so that words can be sounded out using phonics skills the student has already been taught — plus a small, controlled set of high-frequency words.

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Why decodability matters

When students read text aligned to their current phonics knowledge, they:
  • Apply the skill they just learned in real reading, not just in isolation
  • Build automaticity through repeated successful decoding
  • Develop confidence instead of guessing from pictures or context
When text is not decodable for a student, they fall back on memorization, guessing, and frustration — habits that work against the Science of Reading.

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How LitLab measures decodability

Every story in LitLab — whether from the gallery or generated by AI — gets a decodability score against the phonics skill you select. The score is calculated by:
  1. Breaking each word into graphemes and phonemes
  2. Checking whether each grapheme has been taught at or before the target skill
  3. Flagging any words that require skills not yet taught (other than allowed sight words)
You’ll see this score on every story card, in the generator preview, and inside the Decodability Checker, where you can paste your own text.

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What counts as “decodable” in LitLab

LitLab aligns to your full scope and sequence, not just a generic phonics list.‡ A story decodable at UFLI Lesson 47 may not be decodable at Fundations Unit 4 — and LitLab knows the difference.
See Phonics Alignment for how LitLab maps texts to specific lessons in each program. ‡ LitLab aligns practice to leading phonics programs for identification purposes only. All program names and trademarks belong to their respective owners. No affiliation or endorsement is implied.