An ever growing list of random startup ideas in no particular order...
- CCG with full online/offline integration
Collectible card game (like mtg) with a good client that recognizes cards and can put them into your account. Cards would have a unique number such that they can only be claimed by one account (some care must be taken here). Upselling through the online client, possibly with dispensing physical cards 1:1. The client would allow online play against other players or a single player mode, with only your cards.
- Broker for future inheritances
Who needs money when they're dead. You would broker sales of the inheritance of old people. With the population ageing there's plenty of people that have a reason not to care much about their inheritance. What if they could sell it ahead of their time? It's a bit of a gamble and the rules will be weird but the ageing person would receive money before their death to have fun with and the other party gets a random inventory of inheritance. Of course you'll have to deal with scams, angry family, protecting the inheritance between payment and death, etc. Good luck to you.
- Baby pacifier that stays put
If you have kids you'll know about this one. Sell a pacifier that doesn't pop out every five minutes. Fresh parents will throw their money at you.
- Something that tastes like CocaCola but you can drink it without health repercussions
Like, water with a strong taste :) Oh that's what it is, well then fix the health problem!
Digital Rubiks Cube-> GoCube on Kickstarter seems to be close to this. Doesn't look like you can digitally setup the cube but there's some learning and stuff involved. Seems to be a success on kickstarter. Let's see how it fares. (Releases Q2/2019, far away from the time of writing)
A physical cube with leds for each face, bluebooth connection to whatever, an app to drive the color of each face. Not to cheat but to practice. You put the cube in a certain position and you do whatever you're trying to practice. Reset and restart. It shouldn't be hard to do that, the hardware is small enough for it. Somebody just has to build it.
- Source management SaaS with proper diffing
Github with PR diffing done right. The problem is that current diffing algo's are too rigid and not optimized for code review. Just for automated consumption. While that definitely has a few interesting use cases you could do much better in the context of code review. Ignoring whitespace that includes newlines, detecting trivial changes (even if it's user guided, like "this var name changed"). Better semantics in terms of what actually changed in a diff. This would be a game changer and there is sooo much low hanging fruit.