Joltfly free online games and device tests, $1.2K a month, self-reported

Joltfly provides free online games, challenges, trainer games, tests, calculators, and device-testing tools. Its $1.2K a month was founder-reported on the Indie Hackers product page (not independently verified), as of September 30, 2026.

What it actually sells

Joltfly provides free online games, challenges, trainer games, tests, calculators, and device-testing tools. Its tests cover reflexes, aim speed, target accuracy, reaction time, typing speed, reading speed, mouse features, display calibration, field of view, aspect ratio, and display power consumption.

How it charges

The pages we read show no price. They offer free online games, challenges, trainer games, tests, calculators, and device-testing tools, with no currency amounts or paid plan shown on the pages provided.

Where customers come from

The visible website offers free online tools and content.

What stands out

Joltfly combines trainer games with mouse tests, display calibration, color, gamma, contrast, backlight, pixel-mapping tests, field of view, aspect ratio, and display power consumption. The site launched in 2021, and more than 95% of its descriptive content was developed in-house.

From the official site

Are you looking to improve your gaming skills or have fun with trainer games and online device testing?

The Mouse Test help users of Joltfly to test the different features and aspects of their mouse & touchpad devices.

Excerpts from the official website, fetched October 1, 2026.

Where it sits in the data

Joltfly's $1.2K a month is higher than 44% of the 6,604 projects with founder-reported monthly revenue in our dataset; the median across them is $2K. Snapshot: 2026-09-30. The dataset only covers founders who chose to publish their numbers, so it leans toward businesses that work; use it for scale, not as an average.

Currency

All figures are in US dollars as published. A rough yuan or euro conversion is not applied here because prices, taxes and acquisition costs differ by country.

Could you build something like this?

In my view, this is a product for gamers who want entertainment or want to measure gaming and device-performance skills. The buyer could be an individual user seeking a free browser tool, while distribution would need to come from search, recommendations, communities, or direct visits.

The difficult parts are maintaining accurate device tests, keeping tools lightweight across devices, handling technical edge cases, and supporting users who need clear results. A new product would also compete with established games, utilities, and browser-based tools.

Verdict: Needs real work.

One thing to take from it

Joltfly shows a broad collection of free browser-based tools built around specific user tasks. Its product shape spans entertainment, skill practice, device testing, display calibration, and calculators, with no price shown on the pages read.

Sources

Joltfly official website, fetched October 1, 2026
Joltfly about page, fetched October 1, 2026
Indie Hackers product page: revenue founder-reported on the Indie Hackers product page (not independently verified), as of September 30, 2026

Revenue, team and start-cost figures are what the founder reported at the interview date, not current figures and not a prediction of what you will earn. Product and pricing facts come from the business's own website as checked on 30 September 2026. Method & sources · Disclosure