Comparison

Cotter AL Abacus vs Flashnote Derby

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

Head to head
About

Cotter AL Abacus

This educational tool uses a unique double-sided abacus to teach arithmetic concepts through visualization and quantity recognition. It helps learners develop mental strategies for faster mastery of basic math skills.

Highlights
  • Double-sided abacus design
  • Grouped in fives and tens
  • Focuses on quantity recognition
  • Develops mental math strategies
  • Supports visual learning
  • Includes sample lessons
Features
Currently charting
Read full description

Cotter AL Abacus, used with the RightStart™ Mathematics program, now available on your iPhone and iPad! This abacus will teach, not calculate like the Japanese and Chinese abacus, while using subitizing (quantity recognition) and visual strategies to support learning and understanding. Perfect for visual learners! This unique double-sided abacus is grouped in fives and tens for quick recognition of quantities. The second side of the abacus focuses on trading to the thousands. Learn the facts easily by: * visualizing quantities, * minimizing counting, and * developing mental strategies. Those learning arithmetic with the Cotter AL Abacus have a better understanding of basic concepts and need less time to master arithmetic. Although children do enjoy using the abacus, it does not become a crutch. Stan, age 5, was asked how much is 11 plus 6. He replied, “17!” When he was asked how he knew, he replied with a grin, “I’ve got the abacus in my mind.” App has links to sample addition, subtraction, multiplication, and division lessons as well as detailed use information.

About

Flashnote Derby

This app transforms music note learning into an engaging game for young musicians. It offers various ways to practice and play, with customizable drills to suit any student's level. Track progress and make learning fun, whether at home or in lessons.

Highlights
  • Gamified note recognition races
  • Practice mode with no timer
  • Play notes on instrument or MIDI
  • On-screen piano keyboard input
  • Customizable clefs and note ranges
  • Multiple engaging themes
  • Teacher tools for assignments and progress tracking
Features
Currently charting
Read full description

Flashnote Derby is a fun, effective way for kids to learn to read music through fast-paced note flashcard games. Perfect for piano, guitar, band, orchestra, and general music students, this teacher-created app turns note recognition into an engaging game that works equally well at home or in music lessons. ———— Learn to Read Music — Fast Each race is a fast-paced challenge: identify notes correctly as you learn to read music faster and speed your horse toward the finish line. Missed or slow answers allow the other horse to catch up. After each round, students can review the notes they missed— turning every race into a meaningful learning opportunity. ———— New! Practice Mode (No Timer, No Stress) Students can now choose a relaxed 'practice mode' with unlimited time for each note. Perfect for beginners, this mode builds accuracy and confidence before racing competitively. ———— Multiple Ways to Answer Players can answer flashcards in a variety of ways: • Play the note on any instrument. Flashnote Derby listens and recognizes what you play (including transposing instruments). • Use a MIDI instrument • Tap on-screen letter names • Or play notes on the on-screen piano keyboard ———— Fully Customizable for Any Student Tailor each drill to match your student’s level: • Treble, bass, alto, or tenor clef • Select specific note ranges or individual notes • Add sharps, flats, or full key signatures • Adjust time limits (or remove them entirely in Practice Mode) • Expand difficulty all the way up to five-and-a-half ledger lines above and below the staff. As skills grow, you can increase the challenge. Higher difficulty earns higher scores—keeping students motivated. ———— Multiple themes keep practice fresh In addition to the classic horse race, students can take flight with the whimsical Pretty Pegasus course, blast through an arcade-style space challenge in Ecliptic Encounter, or switch to the seasonal Reindeer Race during the holidays. ———— Built for Teachers, Loved by Students Flashnote Derby is designed to fit easily into lessons: • Quick to set up and perfect for a 1–2 minute warm-up • Send homework assignments directly to students • Track progress automatically • See which notes need more review Teachers see real improvement. Students stay engaged. Parents appreciate the progress. ———— Why Flashnote Derby Works Many students struggle because drilling note names feels boring and difficult. Flashnote Derby turns this essential skill into a game—one they’ll want to keep playing. A little daily practice adds up quickly, and students learn to read music with confidence. ———— Get on the road to confident music reading today! Download Flashnote Derby and help your young musician master notes with joy—not frustration.

Screenshots

Cotter AL Abacus4 screens
Flashnote Derby4 screens

Verdict

The call

The clearest difference is review sentiment: Flashnote Derby at 71% against Cotter AL Abacus's 47%. Flashnote Derby also leads on rating (3.8 vs 3.5) and ratings volume (105 vs 6). Cotter AL Abacus's advantage is price ($1.99 vs $4.99) and iOS requirement (13.0 vs 16.6). On update cadence, ads, in-app purchases and chart position 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

Cotter AL Abacus costs $1.99 and Flashnote Derby $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Flashnote Derby holds the better App Store score, 3.8 against 3.5. That said, the two scores are not equally well evidenced: Flashnote Derby has 105 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 47% of Cotter AL Abacus's written reviews are positive against 71% of Flashnote Derby's.

UpkeepUpdate frequency

Cotter AL Abacus ships an update every 9 months, Flashnote Derby every 6 months. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.

Scorecard6 real differences · 5 level
Cotter AL Abacus versus Flashnote Derby: the parameters behind the verdict, then further details
ParameterCotter AL AbacusFlashnote Derby
Price$1.99 — better$4.99
Rating3.5 (6 ratings)3.8 (105 ratings) — better
Positive reviews47.1% of reviews70.7% of reviews — better
Number of ratings6105 — better
Update frequencyEvery 9 monthsEvery 6 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#198#74 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better16.6
Further details — not scored
Size76 MB110 MB
Age rating4+4+
DeveloperActivities for Learning inc.Luke Bartolomeo

Customer experience

Cotter AL Abacus

All ratings6 ratings
Positive50.0%
Neutral16.7%
Negative33.3%
Written reviews17 reviews
Positive47.1%
Neutral5.9%
Negative47.1%

Flashnote Derby

All ratings105 ratings
Positive64.8%
Neutral11.4%
Negative23.8%
Written reviews133 reviews
Positive70.7%
Neutral6.0%
Negative23.3%

Bugs and requests

Cotter AL Abacus

Not enough reviews yet to summarise bugs or requests.

Flashnote Derby

Reported bugs

15 issues
  • App crashes on launch or during use
  • White screen on startup that auto-closes
  • Note recognition fails, particularly for E note
  • Low instrument octave recognition issues
  • Data and student names lost after updates
Show 10 more
  • Settings menu disappears or becomes inaccessible
  • Speed selection buttons unresponsive
  • Email preset sending feature non-functional
  • Password reset system broken
  • Master device cloning feature not working
  • Audio detection marks answers before notes are played
  • Incorrect display scaling on iPad and tablets
  • Slider controls difficult to use on mobile devices
  • App incompatible with Safari and some browsers
  • Family sharing not recognized despite being enabled

Requested features

16 requests
  • Restore previous speed options (Walk, Trot, Canter, Gallop)
  • Option to customize number of test notes (return 10/20 options)
  • Remove or tone down negative feedback sounds
  • Add more theme options (animals, seasonal themes)
  • Untimed mode without racing element
Show 11 more
  • Two-octave keyboard display for better note differentiation
  • Support for sharps and flats
  • Alto and tenor clef options
  • Female jockey character option
  • Combined treble and bass clef exercises
  • Better search visibility in app stores
  • Family sharing support improvements
  • External audio interface compatibility
  • Improved mobile responsiveness for sliders and controls
  • Better instructional videos with audio/visual note examples
  • Personalized high scores for multiple users

In-app purchases

None

Cotter AL Abacus

No in-app purchases

None

Flashnote Derby

No in-app purchases

Questions

Is Cotter AL Abacus free?
Cotter AL Abacus costs $1.99, with no in-app purchases.
Is Flashnote Derby free?
Flashnote Derby costs $4.99, with no in-app purchases.
Which has better reviews, Cotter AL Abacus or Flashnote Derby?
Flashnote Derby is rated higher. Cotter AL Abacus averages 3.5 out of 5 from 6 ratings, while Flashnote Derby averages 3.8 from 105 ratings.
Do Cotter AL Abacus or Flashnote Derby have ads?
Neither Cotter AL Abacus nor Flashnote Derby shows ads.
Which is updated more often, Cotter AL Abacus or Flashnote Derby?
Cotter AL Abacus ships an update every 9 months, and Flashnote Derby every 6 months. Most recently, Cotter AL Abacus was updated on October 12, 2026 and Flashnote Derby on October 10, 2026.
Which is more popular, Cotter AL Abacus or Flashnote Derby?
Cotter AL Abacus currently peaks at #198 in the App Store charts, and Flashnote Derby at #74. Chart position reflects recent download velocity rather than total install base.

Other comparisons