S vs Aha! Math
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
S
Master English vocabulary by understanding the logic of root words. This app uses visual aids and spaced repetition to help you learn thousands of words and track your progress.
- Root word learning method
- Visual imagination images
- Spaced repetition flashcards
- Vocabulary tree exploration
- Progress tracking garden
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Unlock the power of English vocabulary with the Root Word method! S-RootWords helps you learn thousands of words by understanding their core building blocks. Instead of memorizing isolated words, you'll master the logic behind English meanings. Key Features: - Visual Learning: Each root word comes with an "imagination image" to help you remember the concept instantly. - Ebbinghaus Review: Smart flashcards use Spaced Repetition to remind you to review words right before you forget them. - Structured Trees: Explore vocabulary trees – see how one Root connects to many Branches (Prefixes/Suffixes) and leaves (Words). - Progress Tracking: Watch your vocabulary garden grow as you master new roots and words. Whether you're preparing for IELTS, TOELF, SAT, or just want to expand your English lexicon, S-RootWords is your key to deep understanding. Download now and start planting the seeds of your vocabulary! Terms of Use (EULA): https://s-rootwords.s-eduforge.com/terms-of-use Privacy Policy: https://s-rootwords.s-eduforge.com/privacy-policy
Aha! Math
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Turn the words into a "picture" — and your math intuition shoots way up. Aha! Math teaches one powerful idea: every word problem can be redrawn as rectangles. Once you can see the problem, the answer stops being a guess. ■ Read it right, with the Six-Color Marker Method Before solving, you mark up the question yourself — splitting it into chunks and colouring each one. What you are looking for gets its own colour. The app never splits the sentence for you, because deciding where to cut is the part that builds reading skill. Tap "Aha! in Color" any time to see one sample way to split it. ■ See it as an area diagram Height x width = area. Price per item x how many. Points per question x how many questions. Legs per animal x how many animals. One picture handles all of them, so what you learn on one problem carries over to the next. ■ Hints that build the picture with you Hints add one line to the diagram at a time, until the rectangle whose height and width you already know appears. On some problems the final hints work the calculation through, so you can check your answer. Prefer words? "Another Way: Step by Step" walks through the same problem as a guided sequence of small questions. ■ Practice at your level - Learn the Method — Basics and Advanced - Six-Color Marker Method — Master Level - Practice Problems — Basic, Intermediate and Advanced - Test Mode and Challenge Mode, with a timer and randomly chosen problems ■ Track what is growing Every answer, every marking attempt and every hint is recorded, so you can see which problems still need another look. ■ Pricing All features are free for 14 days. After that, a subscription keeps everything unlocked. Monthly, 3-month, 6-month and annual plans are available. There are no ads anywhere in the app. Please note: the app is displayed in English. Made by Arc Shingakukai, a Japanese cram school, from the method it uses with its own students. ■ Subscription terms Aha! Math Premium is an auto-renewable subscription, available as monthly, 3-month, 6-month and annual plans. Current prices are shown on the Subscription screen inside the app. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. You can manage or cancel it in the Settings app: tap your name, then Subscriptions. Deleting the app does not cancel the subscription. Privacy Policy: https://www.arc-edu.com/aha-math-privacy-policy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: Aha! Math at none against S's shown. On price, update cadence, in-app purchases 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
Both are free to download. S sells 3 in-app purchases, starting at $1.99 per month and Aha! Math sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
S ships an update every 4 days, Aha! Math weekly. Both last shipped on October 31, 2026.
| Parameter | S | Aha! Math |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 4 days — better | Weekly |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 82 MB | 102 MB |
| Age rating | 4+ | 4+ |
| Developer | Sang Ngo | Hiroshi Matsumoto |
In-app purchases
S
- Hàng tháng$1.991 Month
- Hàng năm$9.991 Year
- Trọn đời$19.99
Aha! Math
- Monthly$1.991 Month
- 3 Months$4.993 Months
- 6 Months$9.996 Months
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- Annual$14.991 Year









