Comparison

Geometry Stash vs Keopi

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

Head to head
About

Geometry Stash

Access geometry theorems, postulates, and corollaries with descriptions and diagrams. Create and share custom slides with a built-in editor, exporting them in various formats. Ideal for students and educators needing a portable reference.

Highlights
  • Geometry theorem reference
  • Diagrams for geometric terms
  • Custom slide creation editor
  • Vector graphic slide export
  • iOS Spotlight Search integration
  • Slide Over and Split View support
  • Bulk slide import for educators
Features
Read full description

Reviewing geometry on the go has never been easier. Just swipe to a term to view its description and diagram! "Instead of paging through their textbook for the theorems, now students can use this app" -Wired "Geometry Stash is truly ideal for anyone needing a quick reference guide for geometric theories" -SlapApp Which theorem completes the proof? Refresh your knowledge of the most commonly used theorems, postulates, and corollaries with Geometry Stash. Swipe to a term to check it out! Make your own slides to share with others using a built in editor. Write custom slides with drawing commands with instant preview. Share slides in a snap — Airdrop, iCloud, Message, Mail, and more! Your creations will be rendered as vector graphics that retain their crisp and sharp edges no matter what device others and you use! Additional Features: • Custom slide creation: Write your own slides through drawing commands in JSON, a lightweight data-interchange format. Edit on your device, computer, anywhere. • iOS Spotlight Search: Find your slides using iOS Search. • Slide Over and Split View: View slides alongside other study material. • iCloud Drive: Access created slides on all your devices. Write on the computer and view on the go. • Portability: Export slides as JSON, Image file, or Text. • Guided Access: Limit editing slide functionality to keep learners on track. • Bulk Import: Distribute multiple custom slides using a single bulk import file. Ideal for educators and administrators! What others have said about Geometry Stash: "Geometry Stash Offers Comprehensive Mathematical Guide" - The iPhone App Review "My pick for Geometry Stash in terms of what to use it for is actually studying for exams. It certainly beats the flash card system I used for my SATs" - AppBite "Don't let your Math assignments get you down when you have Geometry Stash to help you through" - CooliPhoneApps.com "[Mirroring] would be great in a classroom or for a group study session" - EDUInReview

About

Keopi

Features
Read full description

Learn AI. For real. Keopi is a gamified AI literacy app for everyone — kids, teens, and adults. Whether you're curious, confused, or overwhelmed by AI, Keopi gives you the confidence to understand it, use it, and think critically about it. You're going to be great at this. — THREE PILLARS OF AI LITERACY — Keopi teaches through three core pillars: • Prompting — Communicate with AI clearly and get better results. • Evaluation — Spot hallucinations, biases, and bad outputs. • Ethics — Understand the responsibility that comes with using AI. — WHAT'S INSIDE — • Daily exercises — Five fresh challenges every day, under five minutes. • AI Sandbox — Practice prompting with real AI in a safe, guided space (teens and adults). • Deep Dive courses — 26 modules covering Python, Swift, agents, ethics, and more. • Curated AI news — A daily digest of what's happening in AI, explained simply (teens and adults). • Streaks, achievements, and living badges — Build a learning habit that sticks. • On-device AI — Private learning powered by Apple's Foundation Models. — BUILT FOR EVERY AGE — Age-appropriate from day one. Keopi adapts what you see based on your age tier, so kids get a safe introduction, teens get deeper material, and adults get the full experience. — KEOPI PREMIUM (Optional Subscription) — Unlock everything with Keopi Premium: • Monthly — $4.99 USD / month, auto-renewing • Yearly — $29.99 USD / year (works out to $2.50 / month — save 50%), auto-renewing Premium unlocks: • All 26 Deep Dive courses • Unlimited AI Sandbox conversations • Streak freezes to protect your progress • The Master Prompt Engineer badge Or earn free Premium access by collecting all 5 living badges through daily practice — no payment required. Payment is charged to your Apple ID at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the period, at the displayed price. You can manage or cancel subscriptions in your Apple ID account settings after purchase. — PRIVACY FIRST — Keopi is built with privacy as a foundation: • No personal information collected from children under 13 • Learning progress stays on your device • No third-party analytics or advertising • No cookies, no tracking, no data sold • COPPA-compliant by design — LINKS — Terms of Use (EULA): https://keopi.xyz/terms Privacy Policy: https://keopi.xyz/privacy Support: support@keopi.xyz Made with care. You're going to be great at this.

Screenshots

Geometry Stash4 screens
Keopi4 screens

Verdict

The call

The clearest difference is in-app purchases: Geometry Stash at none against Keopi's 3. Geometry Stash also leads on iOS requirement (15.6 vs 26.2). On price, update cadence, 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. Keopi sells 3 in-app purchases, starting at $4.99 per month. Geometry Stash asks for nothing beyond the download.

UpkeepUpdate frequency

Geometry Stash ships an update every 6 weeks, Keopi every 2 months. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

Scorecard2 real differences · 8 level
Geometry Stash versus Keopi: the parameters behind the verdict, then further details
ParameterGeometry StashKeopi
PriceFreeFree
Rating4.7 (11 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings11 — better—
Update frequencyEvery 6 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better26.2
Further details — not scored
Size3 MB6 MB
Age rating4+4+
DeveloperAnson LiuFrancisco Rodriguez

Bugs and requests

Geometry Stash

Reported bugs

2 issues
  • Wrong theorems
  • Minor bugs fixed

Requested features

7 requests
  • More detailed illustrations
  • More theorems
  • More definitions of terms
  • More activities for students
  • Interactive elements
Show 2 more
  • Teacher control section
  • More formulas and theorems (e.g., slope formulas, orthocenters)

Keopi

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Geometry Stash

No in-app purchases

3 purchases

Keopi

Subscriptions2
  • Keopi Premium Monthly$4.991 Month
  • Yearly Premium$29.991 Year
One-time1
  • Streak Freeze 3-Pack$0.99

Questions

Is Geometry Stash free?
Geometry Stash is free to download, with no in-app purchases.
Is Keopi free?
Keopi is free to download, with in-app purchases available.
Do Geometry Stash or Keopi have ads?
Neither Geometry Stash nor Keopi shows ads.
Which is updated more often, Geometry Stash or Keopi?
Geometry Stash ships an update every 6 weeks, and Keopi every 2 months. Most recently, Geometry Stash was updated on October 15, 2026 and Keopi on October 6, 2026.

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