# IMSA vs GridRival

The clearest difference is review sentiment: GridRival at 83% against IMSA's 28%. GridRival also leads on rating (4.7 vs 4.1) and ads (none vs shown). IMSA's advantage is monetization model (ad-supported vs free with in-app purchases). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GridRival holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: GridRival has 2.6K ratings behind it against 70, so its average is the more settled of the two. Written reviews point the same way: 28% of IMSA's written reviews are positive against 83% of GridRival's.

IMSA ships an update every 2 months, GridRival every 3 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | IMSA | GridRival |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (70 ratings)](https://appshunter.io/ios/app/imsa/id789830071/reviews) | **[4.7 (2.6K ratings)](https://appshunter.io/ios/app/gridrival-fantasy-racing/id1458174608/reviews)** |
| Number of ratings | 70 | **2.6K** |
| Positive reviews | 28.3% of reviews | **83.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 93 MB | 97 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [International Motor Sports Association, LLC](https://appshunter.io/developer/795198030) | [Whitespectre SLU](https://appshunter.io/developer/1651210535) |

## What reviewers say

### IMSA

[App page](https://appshunter.io/ios/app/imsa/id789830071)

Stay updated with every IMSA race weekend. Access live video, IMSA Radio, and real-time timing and scoring for the WeatherTech SportsCar Championship and Michelin Pilot Challenge series.

**Highlights:** Live video streaming, IMSA Radio access, Live timing and scoring, Race weekend coverage, WeatherTech SportsCar Championship, Michelin Pilot Challenge

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Brilliant app
- 👍 Great app
- 👍 Very informative
- 👍 Awesome app!
- 👍 Suburb

**What reviewers complain about**

- 🐛 This app would be amazing if you could actually watch the race on the live stream
- 🐛 Won't let me delete account
- 🐛 Timing and scoring terrible
- 🐛 Live scoring needs improvement
- 🐛 It's so broken

**Reported bugs**

- No portrait mode
- Hamburger menu issues
- Incompatible with newer devices
- Outdated information
- Crashes when opened

**Requested features**

- Apple TV app
- Notifications
- Landscape mode
- Live feed
- Live timing and scoring


### GridRival

[App page](https://appshunter.io/ios/app/gridrival-fantasy-racing/id1458174608)

Engage in fantasy sports for motorsports like INDYCAR, F1, NASCAR, and MotoGP. Compete in season-long leagues or daily 'Picks' contests for a chance to win prizes. Analyze data and connect with friends to dominate your fantasy leagues.

**Highlights:** Fantasy games for INDYCAR, F1, NASCAR, MotoGP, Daily 'Picks' contests with prize potential, Season-long fantasy leagues, In-app data and stats tools, Private league creation and chat, Social features for connecting with friends

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 👍 Engaging fantasy experience
- 💡 Unique contract system
- 🚀 Quick scoring updates
- 👍 Helpful customer support

**What reviewers complain about**

- 🐛 Frequent crashes and bugs
- 🐛 Inconsistent notifications
- 🐛 Scoring issues and inaccuracies
- 🐛 Unreliable login and account management
- 🐛 Slow performance during peak times

**Reported bugs**

- App crashes on launch
- Logout issues and inability to log back in
- Incorrect scoring and points allocation
- Glitches with driver contract system

**Requested features**

- Ability to set lineups automatically
- More motorsport series support (IndyCar, NASCAR, etc.)
- Improved league management tools
- Historical performance tracking
- Expanded betting/DFS options


## Frequently asked questions

### Is IMSA free?

IMSA is free to download, with no in-app purchases.

### Is GridRival free?

GridRival is free to download, with no in-app purchases.

### Which has better reviews, IMSA or GridRival?

GridRival is rated higher. IMSA averages 4.1 out of 5 from 70 ratings, while GridRival averages 4.7 from 2.6K ratings.

### Do IMSA or GridRival have ads?

IMSA shows ads; GridRival does not.

### Which is updated more often, IMSA or GridRival?

IMSA ships an update every 2 months, and GridRival every 3 weeks. Most recently, IMSA was updated on October 23, 2026 and GridRival on October 24, 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.*