PhonoLex Market Differentiation

Competitive research for the Therapy Packs commercialization cycle (PHON-158). Web research conducted 2026-07-12; prices verified from vendor sites on that date unless flagged. Confidence flags: LessonPix and TPT block automated fetches, so those facts come from search-indexed vendor pages and are marked where uncertain.

1. Competitive matrix

Product	Core offering	Phonological search	Images	Sentences	Contrast sets	Psycholing. data	Price (indiv.)
LessonPix	Picture-materials maker, 60–80K symbols, 100+ templates	Best incumbent: sound × position × blends × syllable count (SoundFinder)	Core strength (own symbol library)	None	Minimal pairs only (MinPair Finder)	None	$48/yr
Boardmaker 7 (Tobii Dynavox)	AAC/special-ed symbol platform, PCS 74K symbols, curriculum, student app	None (label/category search only)	Core strength (PCS standard)	None	None	None	$99–199/yr; $399 perpetual
Word Vault (Home Speech Home)	Word-list app: 8,100 words / 87 lists, phrases, stories	Browse by sound/position/blends — static curated lists, not queryable	Pro tier (~2K flashcards)	1,800 canned phrases/sentences	3,800 pre-built minimal pairs	None ("common and functional" by judgment)	Free; Pro $5.99/mo / $54.99/yr
Mommy Speech Therapy	Free printable PDF worksheets per sound/position	None (static PDFs)	Yes (in PDFs)	Canned sentence worksheets	None	None	Free (email-gated)
Ultimate SLP	40K real-photo materials + 100+ interactive games (teletherapy)	Keyword search over curated decks	Core strength (photos)	Not documented	Not clearly documented	None	$12.95/mo / $139.92/yr
SLP Now	Literacy-based materials library (6K+) + planner + data + Medicaid	None	Worksheet images	Canned	Static packs	None	$29/mo / $249/yr
SLP Toolkit	Assessment/progress-monitoring/caseload workflow (no therapy stimuli)	N/A	N/A	N/A	N/A	N/A	$24/mo / ~$215/yr
The Digital SLP	Teletherapy-native digital materials	None documented	Yes	Canned	Static	None	$35/mo / $329/yr
Everyday Speech	SEL/social-communication curriculum + videos	N/A (different niche)	Video	N/A	N/A	None	$599.99/yr
TPT marketplace	~390K "speech therapy" listings; buy-once packets	None (static PDFs/Boom decks)	Per-packet	Canned	Static minimal-pair decks	None	$3–12 items; $60–125 bundles
Articurate Word Lab ⚠️	New (~Jan 2026) "AI-powered" word lists + minimal pairs; claims 10K words / 8K pairs	Claimed; depth unverified	Unknown	Unknown	Minimal pairs claimed	Unknown	Unverified
PhonoLex	Queryable 125K-word phonological lexicon + contrast engine + 236K-sentence corpus + norms	Full: phoneme × position × CV shape × syllables × exclusions × similarity	Mulberry mapping shipping (PHON-162)	Corpus retrieval by constraint (unique)	Minimal + maximal + multiple opposition (unique)	~160 columns incl. AoA, frequency percentiles (unique)	$149/yr test

2. What the incumbents actually are

LessonPix ($48/yr) is the product to respect. It is the only incumbent with real phonological indexing — SoundFinder does sound-by-position with a blends toggle and syllable-count filter, and MinPair Finder does single-sound contrasts — and every result comes with a printable picture, which is why SLPs love it. It stops at the picture-word level: no sentences, no opposition sets beyond minimal pairs, no CV-shape or feature-level queries, no norms of any kind, and vocabulary is bounded by what has a symbol. Famously cheap ($36/yr for 13 years, $48 since Oct 2025) with per-seat group discounts.

Boardmaker ($99–199/yr) is not a phonology competitor — it's the AAC/special-ed symbols-and-curriculum platform (PCS symbols, student app, district admin). Zero sound-based search. Its strengths (assignment, progress tracking, district distribution) are delivery-layer features PhonoLex doesn't have yet, not selection-layer ones.

Word Vault (free/$54.99-yr Pro) is the strongest free incumbent for "word list by sound and position": 8,100 hand-curated words in fixed lists, a full difficulty hierarchy (syllables → words → phrases → sentences → stories), 3,800 pre-built minimal pairs. But the lists are frozen — you cannot compose constraints ("initial /ɹ/, 2 syllables, exclude /s/, high frequency") — and "common and functional" is clinical judgment, not norms. Its free web lists dominate the word-list search traffic PhonoLex's sample-pack pages (PHON-176) will compete for.

Ultimate SLP / SLP Now / Digital SLP ($140–329/yr) are curated-library subscriptions differentiated by engagement (photo games), workflow (planner + data + Medicaid), and teletherapy delivery respectively. All are keyword-search-over-decks; none has a queryable word database.

SLP Toolkit ($215/yr) sells the paperwork side (assessment, progress monitoring, caseload) with no therapy stimuli at all — evidence that SLPs currently buy materials and data tooling separately.

TPT is the real incumbent: a marketplace habit, not a product. $3–12 impulse buys, $60–125 comprehensive phonology bundles, peer provenance ("made by a real SLP"), and permanent ownership. The psychology to beat is buy-once-keep-forever versus subscription.

Articurate Word Lab (articurate.app, ~Jan 2026) is the one AI-wave entrant claiming phonologically precise generation (AI word lists, 8,000+ minimal pairs). Site content was too thin to verify depth or pricing. Watch it; the rest of the 2024–26 AI wave in SLP is documentation (SOAP-note tools) and generic LLM worksheet generation, not phonology.

3. Where PhonoLex is genuinely different (defensible today)

1. A queryable lexicon instead of curated lists. Nobody else lets a clinician compose constraints — phoneme × position × CV shape × syllable count × exclusions × sound similarity — over a 125K-word phonology-complete database. The best incumbent (LessonPix SoundFinder) offers three facets over picturable words; everyone else ships frozen lists.
2. Contrast generation beyond minimal pairs. Maximal opposition and multiple opposition sets, computed over continuous feature distances from learned phoneme vectors, exist nowhere else in this market. Minimal pairs elsewhere are static decks; PhonoLex generates all three contrast types for any target.
3. Psycholinguistic grounding. ~160 norm columns (AoA, frequency percentiles, concreteness, etc.) driving selection and difficulty ordering. No competitor surfaced any data grounding at all — "data-driven stimulus selection" is literally unoccupied territory.
4. Corpus-attested sentences by constraint. 236K curated sentences retrievable under the same constraint vocabulary, with target highlighting. Every incumbent's sentence material is canned worksheets.

Claims 1–3 are the marketing spine; claim 4 is the "nobody else can do this" demo moment.

4. Where PhonoLex is behind

• Images — LessonPix/Boardmaker/Ultimate SLP have 40–80K images; Mulberry mapping (PHON-162) gives us ~3,400 symbols skewed to early vocabulary. Sufficient for pediatric packs, not parity. Every SoundFinder result is picturable by construction; ours won't be (hence the has_image filter).
• Games/engagement layer — none; explicitly out of scope this cycle.
• Delivery/assignment/data collection — Boardmaker's student app, SLP Now's data platform; PhonoLex has neither (the audio R&D loop is the eventual answer).
• Distribution and trust — incumbents have years of SLP word-of-mouth; we have zero installed base and a proprietary-data story that must be explained (the "explainable to clinicians" bar).

5. Pricing assessment

Verified individual-tier landscape (2026-07-12): LessonPix $48 → Word Vault Pro $54.99 → Boardmaker Personal $99 → Ultimate SLP $139.92 → [PhonoLex test $149] → SLP Toolkit ~$215 → Speech Therapy Plans $227 → SLP Now $249 → Digital SLP $329 → Everyday Speech $599.99.

• $149/yr is low-middle: ~40% below the materials-membership median (~$238), directly adjacent to Ultimate SLP — expect head-to-head comparison there.
• Useful framing against TPT habit: one comprehensive phonology bundle ($116–125) ≈ one year of PhonoLex.
• The founding $99 undercuts everything except LessonPix/Word Vault, which compete on price but not capability.
• Out-of-pocket reality: SLPs self-fund like teachers (~$500–750/yr benchmark; no SLP-specific survey exists — data gap). $149 fits inside it.
• Recommendation: keep the $149/$99 test. The risk is not the number; it's subscription-vs-ownership psychology. Mitigations already planned: free tier with real value, editable exports the clinician keeps forever (owned artifact, TPT-like), founding cohort framing.

6. Implications for the current cycle

• Sample packs (PHON-176) should target the exact queries Word Vault/Mommy Speech own today (initial /s/, /k/ vs /t/ minimal pairs, fronting words) — and demonstrate what they can't do: opposition sets, sentence retrieval, difficulty ordering by norms.
• Landing copy (PHON-170, PHON-179) leads with the two-minute pack promise, backed by the three defensible claims — never "125K words / 160 columns" raw (per plan §2.5).
• Images (PHON-162) are table stakes for pediatric credibility; prioritize coverage of the sample-pack vocabulary and show the has_image filter early, since LessonPix users will ask first.
• Watch item: verify Articurate Word Lab's actual capability before the founding-clinician launch; if it's real, differentiation shifts harder onto contrasts + sentences + norms.

7. Open items for advisor review

• Which of the three defensible claims lands hardest with working SLPs (ordering for the landing page)?
• Is the Ultimate-SLP-adjacent price point right, or does the LessonPix anchor ($48) drag expectations down for anything picture-centric?
• Do SLPs perceive maximal/multiple opposition generation as a must-have or a nice-to-have? (Determines whether it's marquee copy or supporting detail.)
• Sample-pack target list: advisor to pick the 3–6 highest-frequency real-world prep tasks.

Source index

Per-vendor sources are inline above; key verified pages: SLP Toolkit pricing, Ultimate SLP annual, Boardmaker 7 purchase options, SLP Now pricing, The Digital SLP, Everyday Speech, Word Vault, LessonPix pricing change, LessonPix SoundFinder, Mommy Speech Therapy worksheets, TPT speech therapy browse, NEA educator self-spending, Articurate Word Lab.