Comparison

Slopes vs Notable Stories

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

Head to head
About

Slopes

Explore graphical solutions to ordinary differential equations with this interactive educational tool. It offers six distinct activities, including plotting vector fields, solving systems of equations, and visualizing oscillations. Ideal for homework, classroom use, or research projects.

Highlights
  • Interactive ODE exploration
  • Vector field plotting
  • Systems of equations solver
  • Numerical approximation methods
  • Bifurcation diagram creation
  • Preloaded and custom examples
Features
Read full description

Slopes is an interactive environment for exploring graphical solutions to ordinary differential equations. Slopes consists of six activities with preloaded examples to get you started and the ability to input your own content. "Slopefields" and “Phase Planes” both plot vector fields and solutions corresponding to multiple initial conditions. “Systems” dynamically solves systems of up to six equations. “Oscillations” solves second-order constant coefficient equations and animates the corresponding spring-mass system or RLC circuit. “Methods” constructs numerical approximations of a single ordinary differential equation using Euler’s method as well as Second and Fourth Order Runge-Kutta methods. "Bifurcations" creates a bifurcation diagram and shows the stability of equilibrium points. Slopes is a playground for ODEs. You can use it for homework, in-class activities or a new research project.

About

Notable Stories

Create personalized, AI-illustrated storybooks with professional narration for children. Describe any story idea, and the app generates a unique book with custom illustrations and voiceovers. Features include voice cloning and age-appropriate content for ages 0-8.

Highlights
  • AI story generation
  • AI-illustrated storybooks
  • Professional AI voice narration
  • Clone your voice for narration
  • Age-appropriate content (0-8 years)
  • Child-safe reading mode
  • Share stories with family and friends
Features
Read full description

Notable Stories creates AI-illustrated, AI-narrated storybooks personalised for your children. Simply describe the story you want — a brave little dragon, a lost puppy, a trip to the moon — and Notable Stories generates a unique illustrated storybook with professional voice narration in seconds. FEATURES - AI Story Generation — unique stories every time - Beautiful AI Illustrations — watercolor, cartoon, and more - Professional Voice Narration — AI voices - Clone Your Voice — narrate stories in your own voice - Age-Appropriate Content — tailored for 0-8 years - Reading Lock — child-safe mode for independent reading - Share Stories — send stories to family and friends Perfect for bedtime, road trips, and sparking a love of reading. Terms of Use: https://app.notablestories.com/terms Privacy Policy: https://app.notablestories.com/privacy

Screenshots

Slopes4 screens
Notable Stories4 screens

Verdict

The call

The clearest difference is in-app purchases: Slopes at none against Notable Stories's 2. Slopes also leads on ratings volume (41 vs 1) and iOS requirement (15.0 vs 17.4). Notable Stories's advantage is update cadence (every 4 weeks vs every 2 months). On price, rating, ads and device support 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

Both are free to download. Notable Stories sells 2 in-app purchases, starting at $4.99 per month. Slopes asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Slopes against 5.0 for Notable Stories. That said, the two scores are not equally well evidenced: Slopes has 41 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Slopes ships an update every 2 months, Notable Stories every 4 weeks. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

Scorecard5 real differences · 5 level
Slopes versus Notable Stories: the parameters behind the verdict, then further details
ParameterSlopesNotable Stories
PriceFreeFree
Rating4.9 (41 ratings)5.0 (1 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings41 — better1
Update frequencyEvery 2 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.4
Further details — not scored
Size21 MB3 MB
Age rating4+4+
DeveloperTim LucasLeon Lipp

In-app purchases

None

Slopes

No in-app purchases

2 purchases

Notable Stories

Subscriptions1
  • Monthly Subscription$4.991 Month
One-time1
  • Story Pack$4.99

Questions

Is Slopes free?
Slopes is free to download, with no in-app purchases.
Is Notable Stories free?
Notable Stories is free to download, with in-app purchases available.
Which has better reviews, Slopes or Notable Stories?
Notable Stories is rated higher. Slopes averages 4.9 out of 5 from 41 ratings, while Notable Stories averages 5.0 from 1 ratings.
Do Slopes or Notable Stories have ads?
Neither Slopes nor Notable Stories shows ads.
Which is updated more often, Slopes or Notable Stories?
Slopes ships an update every 2 months, and Notable Stories every 4 weeks. Most recently, Slopes was updated on October 6, 2026 and Notable Stories on October 8, 2026.

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