Math Practice Platform · Grades 6–8

DeltaMath

Teacher-created math practice platform with immediate feedback, worked examples, and no gamification

Owned by: DeltaMath (Independent, teacher-created)

Indie-built
Created by a math teacher
6–8
Grade range at LMSD
Free tier
Available for core use
Worked examples
Shown after incorrect answers

DeltaMath was created by a high school math teacher (Zach Korzyk) and remains independently operated. It provides math practice problems with immediate feedback and, critically, worked examples shown after an incorrect answer — a pedagogically sound approach that helps students understand their mistakes rather than just know they got something wrong. DeltaMath is one of the very few EdTech platforms used in LMSD that is not owned by an outside firm or venture capital. Its business model is simple: free for basic use, paid subscription (DeltaMath Plus) for premium features.

The Full Picture

The Good

  • Created by a working teacher — pedagogy is the core design principle, not engagement metrics or data collection
  • Immediate corrective feedback with worked examples is one of the most evidence-based practices in math instruction
  • No gamification gimmicks — no SmartScore that drops dramatically, no streaks or leaderboards
  • Assignment builder gives teachers genuine control over problem type, difficulty, and quantity
  • Independent ownership means no firm controlling data or pricing decisions
  • Minimal data collection compared to VC/firm-backed competitors

The Bad

  • Screen-based math practice still displaces pencil-and-paper work, which builds different and important cognitive skills
  • DeltaMath's worked examples can become a crutch — students who skip to the example without attempting the problem first learn little
  • No adaptive algorithm — unlike IXL, DeltaMath assigns the same problem set to all students regardless of skill level
  • Mobile experience is limited — works best on a laptop, creating issues for homework access
  • Premium features require DeltaMath Plus subscription — some teacher-designed features unavailable in the free tier

The Worse

  • Independent ownership is a strength, but also means less formal privacy infrastructure than larger companies — smaller team, smaller security budget
  • No formal FERPA/COPPA compliance audit published on the DeltaMath website — transparency could be improved
  • Student answer data (correct/incorrect, time per problem) is collected; retention and deletion policies are not prominently disclosed
  • Sustainability risk: a single-founder independent EdTech company could be acquired by firm/VC at any time, changing data practices overnight

Privacy Deep-Dive

Ownership

Independently operated by the original teacher-creator; no firm or VC ownership as of 2025

Data Collected

Student login (via Google/Clever SSO), assignment responses (correct/incorrect), time on task, teacher assignment data

Business Model

Free core tier; DeltaMath Plus subscription for premium features — no advertising

COPPA

School accounts; students under 13 accessed through teacher-managed class roster

Data Sharing

Minimal third-party sharing; basic analytics infrastructure

Privacy Policy

Policy available at deltamath.com — less comprehensive than larger platforms; improved transparency recommended

Relative bright spot: DeltaMath is one of LMSD's cleanest EdTech choices — teacher-created, independently operated, no firm ownership, no gamification. The concern is sustainability: an acquisition could change everything. Ask the district to monitor ownership changes.

What It Replaces in the Classroom

DeltaMath online practice
↓ on a screen
Pencil-and-paper problem sets from the textbook or teacher-created worksheets
Digital immediate feedback
↓ on a screen
Teacher circulating during class work, marking incorrect problems and re-teaching in the moment
DeltaMath assignment
↓ on a screen
Math journal with worked problems and student-written explanations
Online homework submission
↓ on a screen
Paper homework collected and reviewed by the teacher

Questions for the District

Has LMSD reviewed DeltaMath's privacy policy and determined it meets district standards for FERPA and COPPA compliance?
Does LMSD have a signed DPA with DeltaMath, and does it address what happens to student data if DeltaMath is acquired?
How many minutes per week do LMSD middle schoolers spend on DeltaMath, and how is this balanced with pencil-and-paper math work?
Does the district monitor for potential acquisition of DeltaMath by firm?

Sources

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