Comparison

Numby vs Sign Documents

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

Head to head
About

Numby

This app uses AI to make learning math fun and accessible for children. It offers engaging exercises and adaptive challenges that adjust to a child's skill level, helping them master basic arithmetic and build a strong foundation for future learning.

Highlights
  • AI-driven adaptive learning
  • Master addition, subtraction, multiplication, division
  • Gradual immersion from simple to complex
  • Progress tracking for children and parents
  • Engaging tasks and rewards
  • Simple and pleasant interface
Features
Read full description

We help children learn to add, subtract, multiply, and divide through engaging computational exercises and activities with AI. We are a team of young parents who have developed a unique math educational game with AI that transforms learning math into an easy, engaging, and understandable process for children of all ages. Our goal is to make math accessible and interesting! * Easy mastery of the basics The game allows children from 3 years old to quickly learn numbers and perform mathematical calculations: addition, subtraction, multiplication, and division. * Gradual immersion Children will immerse themselves in math at different levels. Learning in the game follows the principle of progressing from simple to complex. Each level offers new challenges and engaging tasks. * Adaptive learning with AI AI identifies the child’s level during the learning process and adapts tasks accordingly. If difficulties arise, AI provides helpful recommendations to ensure the child understands the calculation process and can successfully perform it in the future. * Simple and pleasant interface The app interface is designed to make daily activities comfortable and interesting for children. * Progress tracking Children and parents can easily track learning progress, allowing them to see achievements and motivating further success. * Motivation to learn The app inspires children to study math through engaging tasks with AI, reminders, and rewards. * Safety The app is safe for children as it contains no advertisements. The math game with AI is the perfect introduction to the basics of counting and building a solid foundation for solving more complex logical and algebraic problems. The app is suitable for preschoolers as well as older children. The more your child plays, progresses through levels, and interacts with AI, the better their math skills will become. SUBSCRIPTION INFORMATION If you choose a subscription in the app: - Payment will be charged to your iTunes account at confirmation of purchase - Subscription will be renewed automatically unless auto-renew is turned off at least 24 hours before the end of the current period - Account will be charged for renewal within 24 hours prior to the end of the current period and identify the cost of the renewal - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the App Store settings after purchase Privacy Policy: https://ai-math.tech/privacy Terms of Use: https://ai-math.tech/terms Teach math with AI!

About

Sign Documents

Streamline document signing and form completion directly from your device. Create custom digital signatures, fill out forms without printing, and securely share signed files. Keep all your important documents organized and accessible.

Highlights
  • Legally binding digital signatures
  • Custom signature creation
  • Form filling without printing
  • Secure document storage
  • Direct sharing of signed documents
Features
Read full description

Sign documents quickly and securely with a professional digital signature tool designed for convenience and reliability. Whether you're approving contracts, filling out forms, or requesting signatures, this app streamlines the entire process—all from your device. Key Features: - Easy Document Signing – Add legally binding digital signatures in seconds. - Custom Signature Creation – Draw or upload your personalized signature. - Form Filling – Complete and sign forms without printing. - Document Storage – Keep your signed files organized and accessible. - Secure Sharing – Send signed documents directly from the app. Subscription Details: Weekly Plan: $4.99/week with a 3-day free trial Annual Plan: $29.99/year Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. You can go to your iTunes Account settings to manage your subscription and turn off auto-renew. Your iTunes Account will be charged when the purchase is confirmed. Privacy Policy - https://docs.google.com/document/d/1fhmboLBhoYJi96Y2nEauC3Gbt8WKzTpDYLjfA6LADPI/edit?usp=sharing Terms of Use - https://docs.google.com/document/d/1rbz0OhOcEd4g4Zwysy800FjhW_aJ0W677GCFeEQGhCw/edit?usp=sharing

Screenshots

Numby4 screens
Sign Documents4 screens

Verdict

The call

The clearest difference is rating: Sign Documents at 4.9 against Numby's 4.3. On price, ratings volume, update cadence and ads 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. Numby sells 3 in-app purchases, starting at $9.99 per month and Sign Documents sells 7 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Sign Documents holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 6 and 17 respectively.

UpkeepUpdate frequency

Numby ships an update every 3 weeks, Sign Documents monthly. Both last shipped on October 24, 2026.

Scorecard1 real difference · 8 level
Numby versus Sign Documents: the parameters behind the verdict, then further details
ParameterNumbySign Documents
PriceFreeFree
Rating4.3 (6 ratings)4.9 (17 ratings) — better
Number of ratings617 — better
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better16.6
Further details — not scored
Size45 MB33 MB
Age rating4+4+
DeveloperWellness TechnologiesAnastasiia Tkachenko

Customer experience

Numby

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%

Sign Documents

All ratings17 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Numby

Subscriptions3
  • Month math with the Ai-Helper7 Days trial$9.991 Month
  • 3 month Math games + AI-Helper7 Days trial$19.993 Months
  • Year Math with the Ai-Helper7 Days trial$49.991 Year
7 purchases

Sign Documents

Subscriptions7
  • Digital Signature Maker3 Days trial$2.997 Days
  • Digital Signature Maker3 Days trial$4.997 Days
  • Digital Signature Maker3 Days trial$6.997 Days
Show 4 more
  • Digital Signature Maker3 Days trial$9.997 Days
  • Digital Signature Maker3 Days trial$19.991 Year
  • Digital Signature Maker$29.991 Year
  • Digital Signature Maker$39.991 Year

Questions

Is Numby free?
Numby is free to download, with in-app purchases available.
Is Sign Documents free?
Sign Documents is free to download, with in-app purchases available.
Which has better reviews, Numby or Sign Documents?
Sign Documents is rated higher. Numby averages 4.3 out of 5 from 6 ratings, while Sign Documents averages 4.9 from 17 ratings.
Do Numby or Sign Documents have ads?
Neither Numby nor Sign Documents shows ads.
Which is updated more often, Numby or Sign Documents?
Numby ships an update every 3 weeks, and Sign Documents monthly. Most recently, Numby was updated on October 24, 2026 and Sign Documents on October 24, 2026.

Other comparisons