# FOTJ vs Rissa Citizen Science

The clearest difference is update cadence: FOTJ at every 4 days against Rissa Citizen Science's every 4 months. Rissa Citizen Science's advantage is iOS requirement (13.0 vs 17.4). On price, ads, 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.

FOTJ ships an update every 4 days, Rissa Citizen Science every 4 months. The most recent releases landed on October 14, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | FOTJ | Rissa Citizen Science |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 4 months |
| Size | 2 MB | 57 MB |
| Requires iOS | 17.4 | **13.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rodney Dyer](https://appshunter.io/developer/1710556824) | [Rissa Citizen Science](https://appshunter.io/developer/1807336593) |

## What reviewers say

### FOTJ

[App page](https://appshunter.io/ios/app/fotj/id6502670309)

**In-app purchases:** none


### Rissa Citizen Science

[App page](https://appshunter.io/ios/app/rissa-citizen-science/id6744367129)

**In-app purchases:** none


## Frequently asked questions

### Is FOTJ free?

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

### Is Rissa Citizen Science free?

Rissa Citizen Science is free to download, with no in-app purchases.

### Do FOTJ or Rissa Citizen Science have ads?

Neither FOTJ nor Rissa Citizen Science shows ads.

### Which is updated more often, FOTJ or Rissa Citizen Science?

FOTJ ships an update every 4 days, and Rissa Citizen Science every 4 months. Most recently, FOTJ was updated on October 14, 2026 and Rissa Citizen Science on September 9, 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.*