Didax

What Didax does

Didax, Inc. is a privately held educational resources publisher and distributor founded in 1976 and headquartered in Rowley, Massachusetts, with 11-50 employees. The company specializes in physical and virtual math manipulatives, supplemental curriculum materials, and formative assessment tools for the PreK-12 education market, serving K-12 schools and districts, individual classroom teachers, and math specialists/coaches primarily across North America.

The core product portfolio spans physical manipulatives (Unifix cubes, pattern blocks, base ten blocks, counters, geometric solids, measurement tools), publisher-aligned manipulative kits (Eureka Math, Eureka Math2, Zearn, Investigations, Math & YOU, Imagine Learning), supplemental curricula including the exclusive Kathy Richardson line (Developing Number Concepts, Assessing Math Concepts, and the LEAP early algebra progression), the AMC Anywhere web-based formative assessment platform, Virtual Manipulatives, and online professional development courses. The technology layer includes the AMC Anywhere web platform for capturing and reporting longitudinal assessment data at student, classroom, school, and district levels.

Didax operates a primarily direct-to-consumer e-commerce model through didax.com with bulk pricing, account management, and a $99 free-shipping threshold (excluding large kit orders), supplemented by an authorized dealer network (didaxdealer.com), a printed catalog quick-order system for school and district bulk purchasing, and a dedicated professional development site (pd.didax.com). Revenue is generated across hardware sales of manipulatives and kits, one-time purchases of curriculum and assessment books, recurring subscription licensing for AMC Anywhere, and professional development services. The company holds no disclosed funding rounds, parent entities, or M&A activity, operating as an independent privately held corporation.

Name

Didax

Legal name

Didax, Inc.

Website

https://didax.com

Company type

Private

Founded year

1976

Operating status

Operating

Headcount range

11–50 employees

Short description

Didax is a privately held K-12 educational publisher and distributor founded in 1976, selling physical and virtual math manipulatives, curriculum-aligned kits, supplemental curricula (including Kathy Richardson's Developing Number Concepts and Assessing Math Concepts), the AMC Anywhere assessment platform, and professional development to schools, districts, and individual teachers in North America.

Ownership category

akta.pro rank

Product category

Educational Manipulatives & Curriculum Resources

NAICS

Educational Support Services (611710)

SIC

Services-Educational Services (8200)

akta.pro primary industry

Student Activity Materials & Manipulatives (Hands-on Learning Kits) (EDACAJAG)

akta.pro secondary industries

Math Remediation & Numeracy Intervention (EDAKADAB), Problem-Solving & Enrichment Classes (Non-competition) (EDAMAEAB)

Keywords

• Math manipulatives
• Educational resources
• Formative assessment
• Curriculum publishing
• Reading resources

Headquarters

HQ city

Rowley

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Physical Educational Manipulatives Sales: Didax generates revenue through the sale of physical math and reading manipulatives including Unifix cubes, pattern blocks, base ten blocks, counters, measuring tools, geometric shapes, and educational games. Products are sold individually or as comprehensive kits.
2. Curriculum Books and Resources: Sale of educational books including Kathy Richardson's Developing Number Concepts series, Assessing Math Concepts assessment guides, and other teacher resource materials.
3. Manipulative Kits and Bundles: Pre-configured kits aligned to specific curricula (Eureka Math, Zearn, Investigations, Math & YOU) containing specific manipulative sets required for lessons, sold as complete packages.
4. Digital Assessment Subscriptions (AMC Anywhere): Web-based formative assessment tool providing real-time reporting and student progress tracking for districts and schools, suggesting a subscription or licensing model for digital access.
5. Professional Development: Didax offers professional development courses through pd.didax.com covering manipulatives usage including Unifix, Ten-Frames, Rekenrek, Base Ten Blocks, Fraction Tiles & Number Lines, and Color Tiles.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

Didax designs, publishes, and distributes educational manipulatives and supplemental curriculum materials for PreK-12 math and reading instruction. Its catalog spans physical manipulatives (Unifix Cubes, pattern blocks, base-ten blocks, geometric solids, measurement sets), publisher-aligned manipulative kits (Eureka Math, Zearn, Investigations, Math & YOU, Imagine Learning), exclusive math curricula (Kathy Richardson's Developing Number Concepts and Assessing Math Concepts, and the LEAP early algebra progression), a web-based formative assessment platform (AMC Anywhere), virtual manipulatives, and online professional development for educators.

Product overview

Didax is an educational publisher and supplier specializing in math manipulatives and reading resources. The core product portfolio includes physical and digital teaching manipulatives for mathematics (covering algebra, base ten, fractions, geometry, measurement, and more) and language arts (alphabet, comprehension, grammar, phonics, reading, writing). The company distributes several branded curriculum programs: Eureka Math and Eureka Math2 manipulative kits aligned to those curricula; Kathy Richardson's Developing Number Concepts (K-3 curriculum with books, activity cards, and manipulative kits) and Assessing Math Concepts (K-2 formative assessment series available as print books or AMC Anywhere web-based platform); LEAP (Learning Through an Early Algebra Progression for K-5); and publisher-aligned kits for Zearn, Investigations, Math & YOU, and Imagine Learning. Didax also offers Virtual Manipulatives (digital/online manipulatives), Unifix Cubes (their flagship interlocking cube product), professional development courses, and various standalone math manipulatives and games. The company serves PreK-12 education markets with products spanning from individual items to comprehensive classroom kits.

Differentiator

Problem solved

Functional benefit

Brands

• Kathy Richardson Math Curriculum: Supplemental curriculum programs including Developing Number Concepts and Assessing Math Concepts (AMC) for K-3 mathematics education.
• AMC Anywhere

Products and services

• Developing Number Concepts K-3 math curriculum by Kathy Richardson including books, activity card kits, and manipulative kits designed to provide sequential, explicit, and repeated math experiences through recommended math station strategies for early numeracy.
• Assessing Math Concepts (AMC) K-2 formative math assessment series by Kathy Richardson covering nine essential components of foundational numeracy including Counting Objects, Changing Numbers, More/Less Trains, Number Arrangements, Combination Trains, Hiding Assessment, Ten Frames, Grouping Tens, and Two-Digit Addition & Subtraction; available as individual books and complete sets.
• AMC Anywhere Web-based online platform delivering Kathy Richardson's Assessing Math Concepts as a digital formative assessment tool that captures student data and provides real-time reporting on progress by student, classroom, school, and district, including automatic calculation of instructional levels and grouping for differentiated instruction.
• Small Group Intervention Tasks Kit Ready-to-teach K-5 intervention resource with 64 small group lessons, 8 sets of task cards, work mats, game boards, cards, dice, and spinners targeting Counting & Cardinality, Comparing, Addition and Subtraction to 10 and to 20, Place Value, 2-Digit Addition and Subtraction, Multiplication, and Division.
• Eureka Math Manipulative Kits Manipulative kits, complete manipulatives, upgrade kits, and supplemental manipulatives for grades K-12 aligned to the Eureka Math curriculum, distributed by Didax as an authorized Eureka Math and Eureka Math2 partner.
• Eureka Math2 Manipulative Kits Complete, upgrade, and supplemental manipulative kits aligned to the Eureka Math2 curriculum for K-12 classrooms.
• Zearn Manipulatives Grade-level manipulative kits and individual items including teddy bear counters, dot dice, pattern blocks, two-color counters, geometric solids, rekenrek, Unifix cubes, and measuring tools for K-5 aligned to the Zearn math curriculum.
• Investigations Manipulative Kits Manipulative kits and individual manipulatives aligned to the Investigations math curriculum for classroom implementation.
• Math & YOU Manipulative Kits Manipulative kits and individual manipulatives aligned to Big Ideas Learning's Math & YOU curriculum.
• Imagine Learning Manipulatives Manipulatives aligned to the Imagine Learning educational software platform for supplemental math instruction.
• Unifix Cubes Interlocking math teaching cubes sold in sets of 100 and 1,000 used as foundational manipulatives for counting, sorting, patterning, and basic operations in early math.
• Virtual Manipulatives Browser-based digital versions of physical manipulatives that allow students to interact with math concepts online, supporting blended and remote learning environments.
• LEAP (Learning Through an Early Algebra Progression) Supplemental math curriculum for Kindergarten through Grade 5 using an early algebra progression approach to build mathematical understanding, sold by grade level.
• Math and Language Arts Manipulatives & Teaching Resources Catalog of physical and digital teaching manipulatives covering math topics (algebra, base ten, fractions, decimals, percents, geometry, graphing, measurement, money, operations, patterns, place value, probability, problem solving, time, vocabulary) and language arts topics (alphabet, comprehension, grammar, handwriting, phonics, fluency, reading, sight words, spelling, vocabulary, writing).
• Didax Professional Development Online professional development courses covering effective use of Unifix, Ten-Frames, Rekenrek, Base Ten Blocks, Fraction Tiles & Number Lines, and Color Tiles for teachers.
• Math Perspectives Professional Development Professional learning programs from the Math Perspectives Teacher Development Center that help teachers understand how children develop math concepts and apply AMC assessment data to inform instruction.
• Rectangular Prism Set Set of four open-top clear plastic rectangular prisms in four sizes (16 pieces total) for exploring volume relationships between prisms using liquids and solids.
• Gallon Measurement Set Five-piece set of sturdy plastic containers shaped like household items (gallon, half-gallon, quart, pint, cup) with clear equivalency markings for teaching liquid measurement and supporting life-skills and science activities.
• Liquid Measure Kit Kit combining the Nesting Liquid Measure Set, Dry Measuring Cups, Liquid Measurement Cups, and Measuring Spoons for teaching liquid and dry measurement concepts.
• Volume Measurement Dominoes Two sets of 24 foam dominoes (48 pieces total) that practice volume concepts by matching formulas to diagrams and centimeter-cube diagrams to written notation.
• Geometric Volume Shapes 5 cm Set of 17 transparent 3-D shapes with removable lids and stoppers (cube, cone, sphere, cylinder, pyramid, prisms) for exploring volume, surface area, and nets using liquids or solids.
• Geometric Volume Set Set of six plastic geometric shapes (cone, sphere, cylinder, cube, pyramid, rectangular prism) each holding the same 10 cm volume for demonstrating and comparing volume concepts.
• Square Stacking Weights (40 pieces) Set of 40 color-coded, stackable weights (5 pink 20g, 5 purple 10g, 10 orange 5g, 20 yellow 1g) for visual mass comparisons in measurement activities.
• Graduated Beaker 500-ml Polypropylene 500 mL beaker with raised outer graduations and tapered spout for measuring liquid volume in science and math activities.

Quantifiable outcome

• 906 teachers and 13,567 students in Grades K-2 showed statistically significant relationships between formative assessment practices and number sense achievement using AMC Anywhere
• +1 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Seven partnerships are on record, tiered core, minor and flagship.

• Eureka Math / Great MindscoreStrategic or Co-development PartnerDidax is an authorized Eureka Math and Eureka Math2 distributor, offering manipulative kits, supplemental materials, and exclusive items aligned to the Eureka Math curriculum. Products include manipulative kits, complete manipulatives, upgrade kits, and supplemental manipulatives specifically designed for Eureka Math lessons.
• ZearncoreStrategic or Co-development PartnerDidax offers Zearn-aligned grade-level manipulatives kits, providing physical manipulatives that correspond to Zearn's digital math curriculum for K-5 instruction.
• InvestigationscoreStrategic or Co-development PartnerDidax provides manipulative kits and individual manipulatives specifically aligned to the Investigations math curriculum for classroom implementation.
• Math & YOU / Big Ideas LearningcoreStrategic or Co-development PartnerDidax offers manipulative kits and individual manipulatives aligned to Math & YOU curriculum by Big Ideas Learning.
• Imagine LearningminorStrategic or Co-development PartnerDidax provides manipulatives aligned to Imagine Learning products for supplemental math instruction.
• Kathy RichardsonflagshipStrategic or Co-development PartnerDidax is the exclusive publisher and distributor of Kathy Richardson's research-based math curriculum resources including Developing Number Concepts, Assessing Math Concepts, and related professional development. Richardson is recognized as one of the nation's leading elementary mathematics educators.
• Math Perspectives Teacher Development CentercoreStrategic or Co-development PartnerMath Perspectives Teacher Development Center provides professional learning programs for teachers implementing Assessing Math Concepts, helping teachers understand how children develop math concepts and apply assessment data to inform instruction.

Scale indicators3 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• Learning Resources: Leading US manufacturer and seller of hands-on educational manipulatives (including interlocking cubes, pattern blocks, counters, and math games) for PreK-12 classrooms and homeschools. Directly comparable to Didax's physical-manipulatives catalog and DTC channel.
• Really Good Stuff: Teacher-focused retailer of manipulatives, pocket charts, games, and classroom organization supplies. Comparable catalog depth and customer base (individual teachers and small schools) to Didax's DTC channel.
• Nasco Education: Distributor of math manipulatives, lab supplies, and curriculum resources to schools and districts. Comparable catalog breadth in math manipulatives and similar K-12 customer base to Didax.
• Lakeshore Learning: Major educational supplies retailer offering manipulatives, activity kits, and classroom furniture across math, reading, and science. Overlaps with Didax's K-12 manipulatives catalog and serves the same teacher and school buyer.
• ETA hand2mind: Direct competitor selling math manipulatives, activity kits, and curriculum-aligned resources (Base Ten Blocks, Cuisenaire Rods, Fraction Tiles) to K-8 classrooms. Strong overlap with Didax's physical manipulatives and aligned-kit business.

Emerging players

• Curriculum Associates: Developer of i-Ready diagnostic and instruction platform, which competes with AMC Anywhere in K-2 formative assessment. Comparable through the assessment-and-instruction product category overlapping Didax's digital assessment line.
• DreamBox Learning: Adaptive digital math platform embedding interactive manipulatives and virtual learning tools. Competes with Didax's Virtual Manipulatives and AMC Anywhere in the digital math instruction category.

Broad incumbents

• Scholastic Education: Large incumbent publisher and distributor of classroom books, literacy programs, and educational resources. Overlaps with Didax's reading/language-arts and curriculum publishing at a much broader scale.
• School Specialty: Large distributor of K-12 instructional materials, manipulatives, and classroom supplies through direct and dealer channels. Comparable supply-chain scale and broad catalog overlap with Didax's manipulatives distribution.
• Great Minds: Publisher of Eureka Math / Eureka Math2, for which Didax is an authorized manipulative distributor. Comparable in math curriculum expertise and a strategic partner, but operates as a publisher-publisher rather than a manipulative-first supplier.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/DidaxEducation
• YouTubeyoutube.com/DidaxEducation
• Facebookfacebook.com/Didax
• Instagraminstagram.com/didaxeducation
• Pinterestpinterest.com/didaxeducation
• TikToktiktok.com/@didaxeducation
• LinkedInlinkedin.com/company/didax-inc.

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Didax