Comparison

Robot Reading vs f(x) Calc

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

Head to head
About

Robot Reading

This app offers a free, ad-free phonics program for children aged 3-9 to learn reading and writing. It uses evidence-based methods like Systematic Synthetic Phonics and the Science of Reading to build foundational literacy skills through engaging games and interactive lessons.

Highlights
  • Systematic Synthetic Phonics approach
  • Interactive reading and writing games
  • Letter-sound recognition
  • Blending and segmenting practice
  • Sight word recognition
  • Sentence building
  • Full lifetime access
Features
Read full description

Robot Reading is a completely free app that helps toddlers and preschoolers aged 3 to 9 learn to read through fun game play and interactive lessons with no ads, no subscription and no catches. Robot Reading is a phonics app for kids that builds genuine reading and writing skills through the latest evidence based education approaches. Designed by expert teachers using Systematic Synthetic Phonics with interactive activities and a fun adventure game children actually want to play. Built on the Science of Reading, the method literacy experts agree is the most effective way to teach children to read. Every lesson is carefully planned and sequenced. No subscription. No ads. No in-app purchase, completely Free. WHY ROBOT READING IS DIFFERENT Most reading apps for kids rely on guessing, picture clues or memorizing whole words. Robot Reading is built on Systematic Synthetic Phonics, the same approach used in top schools backed by decades of literacy research. Your child learns the sound-letter code of English, step by step, so they can read and write any word, not just the ones they have memorized. Every activity is purposefully sequenced. Nothing is random. Each phonics lesson builds on the last, creating real mastery. WHAT YOUR CHILD LEARNS Robot Reading covers the most important core reading and writing skills from your child's first year of school: Letter-sounds (phonics) — every letter-sound relationship, taught clearly from lesson one Blending and Segmenting (reading and spelling) — sounding out and real words using phonics knowledge Letter and word writing — correct letter formation modeled step by step Sight words — the irregular words every young reader needs to recognize instantly Sentences — read and build full sentences with growing independence A complete phonics program for kids ages 3 to 9, aligned with kindergarten and first grade classroom frameworks used across the US. RIGHT FOR EVERY AGE SPECIFICALLY 3 TO 9 Ages 3–5: Give your child the strongest start before school begins. Robot Reading introduces phonics and early reading skills through play, building real foundations before kindergarten. Ages 5–6: Support exactly what your child is learning in class. Just 20 minutes of reading practice, 3–5 times a week, delivers measurable progress across the full school year. Ages 7+: Ideal for children who need extra reading support. The structured, sequential approach makes Robot Reading one of the most effective reading apps for kids with dyslexia or other learning differences — a clear, supported path with no frustration. Completely. FULL LIFETIME ACCESS. 100% free. Full lifetime access. · While other reading apps charge up to $168 a year, Robot Reading gives your child complete access to every lesson, phonics activity, and reading adventure, absolutely free. Every phonics lesson and activity is fully unlocked from day one, no payment needed. One download covers your whole family with multiple child profiles. No subscription fees, no annual renewals, no surprise charges. · No ads, no in-app purchases, no upsells, ever. Works offline so your child can learn anywhere, no internet required. EVIDENCE-BASED. SCHOOL-TRUSTED. TEACHERS-APPROVED. Most reading apps are packed with ads, hidden paywalls, and distracting games that look like learning but deliver very little. Your child spends time on screens but still struggles to read and you are left wondering if anything is actually working. Robot Reading is different. Every lesson is built on the same literacy science used in high-performing schools Systematic Synthetic Phonics, explicit teaching with clear worked examples, instant feedback, and spaced practice that moves phonics knowledge into long-term memory. This is how schools teach reading, now available to every child for free. No ads. No subscriptions. No paywalls. Just real, structured phonics lessons your child will actually enjoy. Download Robot Reading today — 100% free, full access, real results.

About

f(x) Calc

A full-featured scientific calculator designed for math and science students. It offers natural math entry and includes built-in examples to aid learning. A simplified Junior mode is available for everyday use.

Highlights
  • Natural Maths entry
  • Built-in learning examples
  • Junior mode for everyday use
  • Ideal for math and science study
  • Full-featured scientific calculator
Features
Read full description

Full-featured Scientific Educational calculator with Natural Maths entry. Ideal for Maths and Science study with a built-in examples that will help you to learn how to use your calculator.   The perfect backup when you don't have your school calculator. Try the Junior mode for every-day use, with easy access to the most essential functions.

Screenshots

Robot Reading4 screens
f(x) Calc4 screens

Verdict

The call

The clearest difference is price: f(x) Calc at Free against Robot Reading's $2.99. f(x) Calc also leads on update cadence (every 10 days vs every 6 weeks). Robot Reading's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 16.6). On rating, ratings volume, ads and monetization model there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

f(x) Calc is free to download; Robot Reading costs $2.99 up front. f(x) Calc sells 1 one-off in-app purchase. Robot Reading asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Robot Reading against 5.0 for f(x) Calc. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Robot Reading ships an update every 6 weeks, f(x) Calc every 10 days. The most recent releases landed on September 19, 2026 and September 23, 2026 respectively.

Scorecard4 real differences · 6 level
Robot Reading versus f(x) Calc: the parameters behind the verdict, then further details
ParameterRobot Readingf(x) Calc
Price$2.99Free — better
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 6 weeksEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better16.6
Further details — not scored
Size295 MB5 MB
Age rating4+4+
DeveloperThomas GreenDavid Russell

Customer experience

Robot Reading

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews19 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

f(x) Calc

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Robot Reading

No in-app purchases

1 purchases

f(x) Calc

One-time1
  • Full AccessFree

Questions

Is Robot Reading free?
Robot Reading costs $2.99, with no in-app purchases.
Is f(x) Calc free?
f(x) Calc is free to download, with in-app purchases available.
Which has better reviews, Robot Reading or f(x) Calc?
Robot Reading and f(x) Calc are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do Robot Reading or f(x) Calc have ads?
Neither Robot Reading nor f(x) Calc shows ads.
Which is updated more often, Robot Reading or f(x) Calc?
Robot Reading ships an update every 6 weeks, and f(x) Calc every 10 days. Most recently, Robot Reading was updated on September 19, 2026 and f(x) Calc on September 23, 2026.

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