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Decodable Book Series Compared: 9 Major Series in Order of Difficulty

By Readigo editorial team · 2026-08-03 · 12 min read

Short answer

The cleanest difficulty ladder runs Bob Books, then Charge into Reading, then Dog on a Log. Bob Books covers first sounds through magic-e in five short sets. Charge into Reading carries the middle stretch - blends, digraphs, long vowels, vowel teams - across 12 small stages. Dog on a Log turns the same phonics steps into real chapter books, the natural last rung before your child reads regular chapters. Every other series in this guide maps onto that same ladder.

Why series comparison is harder than it should be

Every decodable publisher invents its own level names. Bob Books counts sets. Half-Pint Kids uses letters. Dog on a Log uses steps. Charge into Reading uses stages, including a Stage 1.5. None of them line up by name, and a "Level 2" in one series can sit a full year of phonics away from a "Level 2" in another. Under the naming chaos, though, nearly every series follows the same spine. Short-vowel CVC words first. Then digraphs (sh, ch, th). Then consonant blends. Then magic-e long vowels. Then vowel teams and r-controlled vowels. Then multisyllabic words. That spine comes from structured-literacy scope and sequence, and it is the reason you can finish one series mid-way and pick up another without losing your place. So this guide does two things. First, it puts each major series on that shared spine, with its real level counts. Second, it answers the practical question the publishers never answer: your child finished level X of series Y, so what do you hand them next? If you first want the case for decodables themselves, start with what decodable books are. This page assumes you are sold and just need the map.

The ladder: 9 series in order of difficulty

Each entry below covers the same four things. Level structure, phonics span from first book to last, the child it fits best, and format or price tier. Series are ordered roughly by where they start and how far they go. Bob Books - 5 core sets plus extension sets. Set 1 has 12 tiny books built on m, s, t, p, n with short a and i. Set 5 ends at magic-e (bake, rope, hike). Best fit: pre-K to grade 1, the standard first series. Format: small paperbacks, the cheapest tier - a used Set 1 runs $15-20 and most libraries stock it. Half-Pint Kids - 3 levels of 36 books each, 108 titles total. Level A covers consonants, short vowels, and 33 sight words. Level B adds 16 blends and digraphs. Level C reaches long vowels. Best fit: K-1 kids who want color illustrations and real storylines instead of stick figures. Format: small illustrated paperbacks, mid-price. Express Readers - numbered steps by teacher-author Elise Lovejoy. Step 1 (8 books) sticks to VC and CVC words. Step 3 covers digraphs including -ng and -nk. Step 6 (15 books) reaches multisyllabic words. Each book lists its "sticky words" - the not-yet-decodable high-frequency words - up front. Best fit: K-2 home practice with a clear checklist feel. Format: mini paperback sets, mid-price. Whole Phonics - the Level 1 set is 55 books across five mini-series: Off We Go! (8 books, consonants and short a), Levels One to Three (15 books each, CVC through digraphs and beginning blends), and 2 early chapter books for ending blends and compound words. Best fit: K-1 kids who respond to recurring characters and humor. Format: full-color books, premium tier - the complete set lists at $350. Primary Phonics (EPS) - 6 sets of 10 storybooks each, matched to companion workbooks. The sequence starts at short-vowel CVC and Set 6 ends at soft c and g, dge, ph, oi, oy, and igh. Best fit: K-2, especially if you want a workbook-plus-reader structure like a school intervention room. Format: plain slim storybooks, mid-price, sold per set or as a full kit. Charge into Reading - 12 stages from Stage Pre-1 (10 beginning letter-sound books) through Stage 9 (advanced spelling patterns), with single-skill sets in between: 5 short-vowel books at Stage 1, 5 blend books at Stage 2, 6 digraph books at Stage 3, 5 magic-e books at Stage 4, then endings, r-controlled vowels, vowel teams, and diphthongs. Every book targets one sound and is vetted by an Orton-Gillingham-trained specialist. Best fit: the longest single ladder on this list, used in intervention from grade 1 to grade 4. Format: full-length paperbacks with built-in activities, mid-price. Flyleaf Publishing - the Emergent Reader Series is 41 books covering single consonants, short vowels, and high-utility digraphs. Reading Series One adds 10 longer decodable texts for grade 1, and a Decodable Literature Library extends to advanced K-2. Best fit: kids who find typical decodables charmless - Flyleaf reads closest to real children's literature. Format: full-color books used widely in structured-literacy schools, premium tier. Dog on a Log - 9 steps of decodable chapter books by Pamela Brookes, designed for kids with dyslexia. Step 1 already includes consonants, short vowels, and the digraphs ch, sh, th, wh, ck. Step 9 reaches two-syllable words and the first vowel teams (ai, ay, ea, ee). Each step has multiple full chapter books plus shorter Let's GO! versions of the same stories. Best fit: readers 7-11 who need controlled text but refuse baby-looking books. Format: regular-sized paperbacks, budget tier for what you get. Reading A-Z decodables - a digital library with hundreds of decodable titles ordered by phonics skill, from CVC through multisyllabic words. Access is by subscription (around $109 per teacher per year) or free through your child's school. Best fit: volume - when your child needs 20 more books at the same level, this is where you get them. Format: print-at-home PDFs or on-screen reading.

Which series comes after which

Here is the payoff. Match what your child just finished to the right entry point in the next series. The handoffs below follow the shared phonics spine, not the level names. Finished Bob Books Set 2 (all short vowels). Move to Half-Pint Kids Level B, Charge into Reading Stage 2, or Express Readers Step 2. All three pick up at blends and digraphs. Or stay in Bob Books through Set 4 if the plain style is not a fight. Finished Half-Pint Kids Level A or Whole Phonics Level One. Same spot as above - your child owns CVC. Any series' digraph level works next. Charge into Reading Stage 3 is the tightest match because each of its 6 books drills one digraph. Finished Bob Books Set 5 or Charge into Reading Stage 4 (magic-e). This is the big midpoint. Move to Dog on a Log Step 5 for chapter-book format, Charge into Reading Stage 5-7 for endings and vowel teams, or Primary Phonics Sets 4-6 for a workbook-paired route. Finished Flyleaf's Emergent Reader Series. Reading Series One is the in-house next step. If your child wants chapters instead, Dog on a Log Step 4-5 sits at roughly the same phonics load. Finished Half-Pint Kids Level C (long vowels). Charge into Reading Stage 6-9 covers what is left - r-controlled vowels, vowel teams, diphthongs, advanced patterns. So does Dog on a Log Step 6 and up. Finished Charge into Reading Stage 9 or Dog on a Log Step 9. Your child has covered the major code. The next books are not decodables at all - early chapter books like Frog and Toad and Henry and Mudge. Keep one decodable series around only for patching specific weak patterns. A note on one quirk. Charge into Reading teaches blends (Stage 2) before digraphs (Stage 3). Most other series flip that order. If you switch series around this point, check whether your child has actually met both before moving up.

What counts as "level one" in each series

Parents search for "level one decodable books" and get nine different products, because level one means something different in every line. Here is what the first level actually contains, easiest first. Easiest true starts. Bob Books Set 1 (five consonants, short a and i), Whole Phonics Off We Go! (consonants and short a), Charge into Reading Stage Pre-1 (beginning letter sounds), and Express Readers Step 1 (VC and CVC words). These suit a child who knows most letter sounds but has just started blending. Standard starts. Half-Pint Kids Level A and Primary Phonics Set 1 open with the full short-vowel CVC range. Fine for a child who can already blend three sounds. Heavier starts. Flyleaf's Emergent Reader Series includes some digraphs from early on, and Dog on a Log Step 1 packs in consonants, short vowels, and five digraphs at once. A brand-new blender will drown in Step 1. A 7-year-old restarting phonics after a rough start will not. The practical rule: pick the level-one set whose contents your child can read at about 95% accuracy - roughly one miss in 20 words. If they breeze through the sample pages, skip up a level. If they stall more than twice per sentence, the "level one" you picked is actually too hard, and an easier series' first set is the honest starting point.

Matching a series to your child

Three questions settle the choice faster than any review roundup. Where is your child on the phonics spine? Not their age, and not their school's letter-level. If you are unsure, a five-minute reading level test gives you a placement, and our decodable books list by level walks the full progression stage by stage with book picks for each. What format will they actually pick up? A 5-year-old is fine with Bob Books minimalism. A 6-year-old who loves characters does better with Whole Phonics or Half-Pint Kids. A 9-year-old who is behind needs Dog on a Log, full stop - format pride is real and fighting it wastes months. How much volume do they need? Typical readers move through a level in a few weeks and one print series is enough. Kids who need many more repetitions - common with dyslexia - burn through everything at a level and still need more. That is the case for adding Reading A-Z's digital volume on top of a print series, or choosing Dog on a Log, which publishes several full books per step. One thing not to worry about: brand loyalty. The series all teach the same code, which is the entire point of phonics-first instruction. If the debate behind that sentence interests you, phonics vs whole language covers why controlled text won the research fight. Switching series at a level boundary costs your child nothing and often buys back their interest.

Making the daily read-aloud stick

Whichever ladder you pick, the books only work one way - your child reading them aloud, daily, with someone catching the misreads. That someone is usually you, and the hard part is not the listening. It is knowing whether this week's stumbles are the same as last week's, and whether the current level is still the right one. This is where we should be upfront about our own tool. Readigo is an iOS app for kids ages 6–12. It listens while a child reads aloud and scores the reading in real time. The scores cover accuracy, fluency, pace, and clarity, so you can see whether digraphs are finally sticking or whether your child is ready to move from one level to the next - the same judgment call this whole guide is about. You can see the mechanics on how it works. The books stay the core. Ten to fifteen minutes a day in the right decodable series, at the right level, moving up the ladder on evidence instead of guesswork. That is the whole method.

Sources

Frequently asked questions

  • What level one decodable books should we start with?

    Start with Bob Books Set 1, Whole Phonics Off We Go!, or Charge into Reading Stage Pre-1 if your child is brand new to blending - all three open with just a few consonants and one or two short vowels. If your child can already blend CVC words like cat and sun, skip those and start at Half-Pint Kids Level A or Primary Phonics Set 1, which cover the full short-vowel range. The test is accuracy: your child should read about 19 of every 20 words correctly at the level you pick.

  • What are the Reading A-Z decodable book levels?

    Reading A-Z's famous letter levels (aa through Z) belong to its leveled-reader library, not its decodables. The decodable collection is separate and ordered by phonics skill instead - hundreds of titles running from CVC words through digraphs, blends, long vowels, and multisyllabic words. So you place your child by which phonics patterns they know, not by a letter. Access is by subscription, though many schools already have one and will let you print books for home practice.

  • What order should we read decodable book series in?

    You do not need to finish whole series in sequence - you need to follow the phonics spine that runs through all of them: CVC words, then digraphs, then blends, then magic-e, then vowel teams and r-controlled vowels, then multisyllabic words. A clean path is Bob Books Sets 1-2 for CVC, any series' digraph and blend levels for the middle (Charge into Reading Stages 2-3 are the most targeted), then Dog on a Log chapter books from magic-e onward until your child graduates to regular early chapter books.

  • Do we need to buy more than one decodable series?

    Usually not. One print series plus a library card covers a typical reader, since most libraries now stock Bob Books and often Flyleaf. Add a second source in two cases: your child needs far more repetition at each level than one series provides - common with dyslexia, where Reading A-Z's volume or Dog on a Log's multiple books per step helps - or your child rejects the format of the series you own, in which case switching at a level boundary costs nothing.

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