# Planet Math vs Read 21 Jumpstart

The clearest difference is ads: Read 21 Jumpstart at none against Planet Math's shown. Read 21 Jumpstart also leads on update cadence (every 3 days vs every 2 weeks) and rating (5.0 vs 4.8). Planet Math's advantage is ratings volume (10 vs 3). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Planet Math sells 7 in-app purchases, starting at $2.00 per month and Read 21 Jumpstart sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Read 21 Jumpstart holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 10 and 3 respectively.

Planet Math ships an update every 2 weeks, Read 21 Jumpstart every 3 days. The most recent releases landed on September 24, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Planet Math | Read 21 Jumpstart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (10 ratings)](https://appshunter.io/ios/app/planet-math/id6463144939/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/read-21-jumpstart/id6745806435/reviews)** |
| Number of ratings | **10** | 3 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 583 MB | 102 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fezba Interactive Inc](https://appshunter.io/developer/1704006061) | [Read 21, Corp.](https://appshunter.io/developer/1685163270) |

## What reviewers say

### Planet Math

[App page](https://appshunter.io/ios/app/planet-math/id6463144939)

Master math skills through engaging gameplay with this teacher-approved learning game. It offers various modes, from basic arithmetic to advanced concepts, with competitive online play and leaderboards. Designed to make learning fun and rewarding for students of all levels.

**Highlights:** Teacher-approved educational design, Multiple game modes (Adventurer, Superhero, Brainiac, Mastermind), Covers arithmetic, fractions, algebra, geometry, calculus, Online battles and private rooms, Global leaderboards and achievements, Hand-drawn visuals and energetic soundtrack

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Pack | $2.00 | per month |
| Three Month access | $4.00 | per 3 months |
| Six months of Premium Access | $6.00 | per 6 months |
| Twelve month Premium Access | $8.00 | per year |
| Silver Support | $1.99 | one-time |
| Gold Support | $4.99 | one-time |
| Platinum Support | $14.99 | one-time |


### Read 21 Jumpstart

[App page](https://appshunter.io/ios/app/read-21-jumpstart/id6745806435)

Master reading fundamentals in 21 days with this app. It uses phonics and decoding strategies, with speech recognition for instant feedback. Suitable for all ages, from elementary kids to adults and ESL learners.

**Highlights:** Phonics and decoding strategies, Speech recognition with instant feedback, Timed reading challenges, Science of Reading methodology, Suitable for all ages, ESL friendly

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Read21: Jumpstart | $4.99 | per month |


## Frequently asked questions

### Is Planet Math free?

Planet Math is free to download, with in-app purchases available.

### Is Read 21 Jumpstart free?

Read 21 Jumpstart is free to download, with in-app purchases available.

### Which has better reviews, Planet Math or Read 21 Jumpstart?

Read 21 Jumpstart is rated higher. Planet Math averages 4.8 out of 5 from 10 ratings, while Read 21 Jumpstart averages 5.0 from 3 ratings.

### Do Planet Math or Read 21 Jumpstart have ads?

Planet Math shows ads; Read 21 Jumpstart does not.

### Which is updated more often, Planet Math or Read 21 Jumpstart?

Planet Math ships an update every 2 weeks, and Read 21 Jumpstart every 3 days. Most recently, Planet Math was updated on September 24, 2026 and Read 21 Jumpstart on September 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*