Comparison

ERSB Lite vs Numbuko

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ERSB Lite

This app builds early reading skills for students progressing from foundational literacy. It uses systematic instruction and assessments to help individuals read independently, proving effective for those with intellectual disabilities and autism.

Highlights
  • Early literacy skill development
  • Systematic instruction
  • Ongoing assessments
  • Progress to 2nd-grade reading level
  • Effective for intellectual disabilities
  • Effective for autism
Read full description

Note: This is the Free version of ERSB. Level 1 with 5 lessons is Free! The rest of the levels are available through the in-app store. Early Reading Skills Builder™(ERSB) curriculum, based on a multi-year research project from the University of North Carolina at Charlotte, is a stepping stone for graduates of Attainment’s ELSB Curriculum. ERSB takes students who mastered these early literacy skills to a 2nd grade reading level. It incorporates systematic instruction and ongoing assessments to teach students to read independently. It’s been proven effective for students with moderate to severe intellectual disability and/or autism, including those with complex communication needs.

About

Numbuko

Read full description

Numbuko is a colourful and creative way for children to explore number patterns. Informed by research at the University of Edinburgh, UK, Numbuko squares are like many colour rods used in mathematics, but can magically change colour according to the number attached, giving children interactive feedback. Unlike ‘drill and practice’ apps, Numbuko lets children explore number relationships, such as addition, subtraction, fractions, odd and even, and tens and units. Features • Explore fundamental maths concepts for numbers 1-99 • Build and share creative patterns • Add/Remove colour - Encourage predictions • Add/Remove division lines between squares - Encourage/Discourage counting • Save configurations • Find out about the background research Numbuko aims for children to freely explore independently and learn through talk with an adult

Verdict

The call

The clearest difference is in-app purchases: Numbuko at none against ERSB Lite's 5. ERSB Lite's advantage is update cadence (every 2 months vs every 108 months) and iOS requirement (13.0 vs 17.6).

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

UpkeepUpdate frequency

ERSB Lite ships an update every 2 months, Numbuko every 108 months. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.

Scorecard3 real differences · 7 level
ERSB Lite versus Numbuko: the parameters behind the verdict, then further details
ParameterERSB LiteNumbuko
PriceFree — better—
Rating4.0 (3 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 2 months — betterEvery 108 months
AdsNo—
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPad — better—
Requires iOS13.0 — better17.6
Further details — not scored
Size253 MB2 MB
Age rating4+4+
DeveloperAttainment CompanyAndrew Manches

In-app purchases

5 purchases

ERSB Lite

One-time5
  • Levels 12-16$29.99
  • Levels 17-21$29.99
  • Levels 22-26$29.99
Show 2 more
  • Levels 2-6$29.99
  • Levels 7-11$29.99
None

Numbuko

No in-app purchases

Questions

Is ERSB Lite free?
ERSB Lite is free to download, with in-app purchases available.
Is Numbuko free?
Pricing for Numbuko is not currently listed on the App Store.
Which is updated more often, ERSB Lite or Numbuko?
ERSB Lite ships an update every 2 months, and Numbuko every 108 months. Most recently, ERSB Lite was updated on November 1, 2026 and Numbuko on October 26, 2026.

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