NewHomeschool ELA courses for K-5 — a voiced daily English lesson
SpellingJoy
For Teachers

Best Apps for RTI / Response to Intervention (2026)

Adaptive, data-driven apps for Tier 1, 2, and 3 instruction in reading, math, and spelling.

STSpellingJoy Team
•Last Updated: March 30, 2026
Teacher working with students on intervention activities

Our top picks

1

Lexia Core5 Reading

Best for reading intervention

Lexia Core5 is a research-backed adaptive reading program used in 1 in 4 US schools. Strong focus on Science of Reading principles and early literacy intervention.

Best for:Research-backed Tier 2/3 reading interventionPrice:School pricingGrades:Pre-K-5Platforms:Web, iOS, Android

Pros

  • Research-backed (Science of Reading)
  • Adaptive learning paths
  • Strong for struggling readers

Cons

  • Primarily sold to schools
  • Not available for individual purchase
  • Interface can feel clinical
2

IXL

Best progress monitoring

IXL is a comprehensive adaptive learning platform covering all subjects from Pre-K through 12th grade.

Best for:Adaptive practice with real-time diagnostics across subjectsPrice:$79-159/yrGrades:Pre-K-12Platforms:Web, iOS, Android

Pros

  • Comprehensive K-12 coverage
  • Adaptive learning
  • Detailed analytics

Cons

  • Expensive
  • Spelling is small part of ELA
Our pick
3

SpellingJoy

Best free spelling intervention

SpellingJoy is a 100% free spelling practice platform for K-6 students. Unlimited spelling games, unlimited tests, 134+ word lists, custom list creation, and progress tracking - all completely free with no subscriptions and no hidden costs.

Best for:Free spelling practice with placement test and progress trackingPrice:100% FreeGrades:K-6Platforms:Web

Pros

  • 100% free - unlimited games, tests, and lists
  • No subscription or hidden costs ever
  • K-6 curriculum with 134+ word lists

Cons

  • Web-only (no native mobile apps yet)
  • Classroom features coming soon
4

Prodigy

Best for math engagement

Prodigy uses game-based learning to teach math, with a newer English/ELA component.

Best for:Game-based math intervention that keeps struggling students motivatedPrice:$59-180/yrGrades:Grades 1-8Platforms:Web, iOS, Android

Pros

  • Engaging game format
  • Free basic version
  • Curriculum aligned

Cons

  • In-game purchase prompts
  • Premium expensive
  • Primarily math-focused
5

DreamBox

Best adaptive math

DreamBox is an adaptive K–8 math program that provides rigorous and personalized instruction using interactive visuals and intelligent scaffolding. Widely used in schools and homes.

Best for:Intelligent math scaffolding that adapts in real timePrice:$12.95/moGrades:K-8Platforms:Web, iOS

Pros

  • Personalized learning adapts in real time
  • Strong visual and conceptual explanations
  • Aligned with Common Core and state standards

Cons

  • Premium pricing
  • Can be overwhelming for some younger students
6

Reading Eggs

Best for early reading

Reading Eggs provides a comprehensive reading program for children ages 2-13 with lessons, games, and books.

Best for:Structured phonics-based reading intervention for K-2Price:$70-100/yrGrades:Ages 2-13Platforms:All platforms

Pros

  • Wide age range
  • Comprehensive program
  • Includes spelling component

Cons

  • Expensive
  • Can be overwhelming
7

Khan Academy Kids

Best free all-around

Khan Academy Kids offers free, comprehensive early learning content covering reading, math, and more for children ages 2-8.

Best for:Free adaptive practice for Tier 1 universal screening supportPrice:FreeGrades:Ages 2-8Platforms:iOS, Android, Amazon

Pros

  • Completely free
  • Comprehensive curriculum
  • No ads

Cons

  • Only goes to age 8
  • Not specialized for spelling
  • No web version

Frequently asked questions

What is RTI (Response to Intervention)?

RTI is a multi-tiered framework schools use to identify and support students who are struggling academically. Tier 1 provides high-quality instruction for all students, Tier 2 offers targeted small-group intervention, and Tier 3 delivers intensive one-on-one support. Apps play a growing role at every tier by providing adaptive practice and data-driven progress monitoring.

What are the best apps for Tier 2 and Tier 3 intervention?

Lexia Core5 is widely regarded as the gold standard for reading intervention at Tier 2 and 3, used in 1 in 4 US schools. For math, DreamBox provides adaptive scaffolding ideal for small-group and intensive instruction. SpellingJoy offers free spelling intervention with a built-in placement test to pinpoint skill gaps.

How can I track RTI progress with apps?

Look for apps with built-in progress monitoring dashboards. IXL provides real-time diagnostic reports aligned to standards. Lexia Core5 offers detailed teacher analytics showing student growth over time. SpellingJoy includes free progress tracking so teachers can monitor spelling improvement without any subscription cost.

Are there free apps that work for RTI?

Yes. SpellingJoy is 100% free and includes placement tests, 134+ word lists, and progress tracking suited for spelling intervention. Khan Academy Kids offers free adaptive learning for early learners. Prodigy has a free tier for math practice. These can supplement paid intervention tools at any RTI tier.

How do I choose an RTI app for my classroom?

Focus on three criteria: (1) adaptive difficulty that meets students at their level, (2) detailed progress reports you can use for RTI documentation, and (3) alignment with your curriculum standards. Also consider whether the app supports the specific subject area where students need intervention, such as reading, math, or spelling.

Our Verdict

Lexia Core5 is the top choice for reading intervention at Tier 2 and 3, backed by Science of Reading research and used in thousands of schools nationwide.

For math intervention, DreamBox offers intelligent adaptive scaffolding, while IXL provides the strongest cross-subject progress monitoring for RTI documentation.

For spelling intervention, SpellingJoy delivers free placement tests, 134+ word lists, and progress tracking - everything you need for RTI without spending a dollar.

ST

About the Author

SpellingJoy Team

The SpellingJoy team is dedicated to creating free, high-quality spelling resources for K-6 students and their families. We test every app we review and provide honest assessments to help parents make informed decisions.

Related articles

Apps for Struggling Readers

Targeted reading support

Apps for Differentiated Instruction

Multi-level classroom tools

Spelling Apps for Special Needs

Inclusive spelling practice