App ideas — week of October 12, 2026

Downstream from mining: it logs hardware uptime, pool payouts, power cost, and monthly profit instead of pretending the phone mines.

These users pay to know if their rigs are making money or just burning power.

Why build it: Proven demand: a small app in this space held the US top paid chart on 2 of 7 days with only 6 ratings. Crowded at the top (11 of 49 apps have 10k+ ratings), hence the narrower angle. The data already exists.

Data to build on: Mining pool APIs such as Braiins Pool, Slush Pool, ViaBTC, F2Pool, and Electricity Map or utility tariff data. Catch: each pool has its own auth/API rules and electricity pricing data varies by region.

Turns monster building into printable encounter cards with stats, tags, and initiative order instead of a shareable toy gallery.

They pay for prep time saved. A GM will buy anything that reduces session prep and looks usable at the table.

Why build it: Proven demand: a small app in this space held the US top paid chart on 2 of 7 days with only 3 ratings. Crowded at the top (12 of 56 apps have 10k+ ratings), hence the narrower angle. The data already exists.

Data to build on: Open5e API or the 5e SRD/OGL monster content; obtain by API fetch or packaged SRD text. Catch: license compliance and attribution requirements.

Only does annual-fee payback math, with a simple keep/cancel recommendation and no general perk catalog.

People will pay to avoid wasting a $95 to $695 fee on a card that no longer earns its keep.

Why build it: Proven demand: a small app in this space held the US top paid chart with no ratings yet. Crowded at the top (19 of 66 apps have 10k+ ratings), hence the narrower angle. The data already exists.

Data to build on: Card benefit pages from issuers, public card comparison pages, and manual user-entered spend/use logs; card terms can be copied from issuer websites but must be maintained by hand because no stable open benefits database exists.

Recipes that focus on low-calorie, gluten-free, or vegan options.

Health-conscious consumers are often willing to pay for specialized recipes.

Why build it: Proven demand: a small app in this space held the US top paid chart on 5 of 7 days with only 177 ratings. Crowded at the top (16 of 59 apps have 10k+ ratings), hence the narrower angle. The data already exists.

Data to build on: Existing health and nutrition databases can be referenced for ingredient substitutions.

Focuses on workplace emotions and provides tips for professional interactions.

Companies may pay for tools that improve workplace communication and mental health.

Why build it: Proven demand: a small app in this space held the US top paid chart with no ratings yet. Crowded at the top (8 of 61 apps have 10k+ ratings), hence the narrower angle. The data already exists.

Data to build on: Existing workplace mental health resources and surveys can inform content.

Simplifies the metering process with a more user-friendly interface and educational tips.

This audience may pay for an easy-to-use tool that helps them learn photography basics.

Why build it: Proven demand: a small app in this space held the US top paid chart on 3 of 7 days with only 6 ratings. Crowded at the top (9 of 64 apps have 10k+ ratings), hence the narrower angle. Content must be authored — that's also the moat.