The online puja apps and Sevahey are built on different models, and which one suits you depends on what you are actually trying to do. Each page below sets out the differences in checked facts, with the source and the date beside every claim, and says plainly where the other service is the better choice.
Every claim about another company is read off that company's own public pages and carries a link and the date it was read. Nothing on these pages describes a competitor's quality or the outcomes they produce, only what they publish about themselves. Where a fact is not publicly stated, the row is left out rather than estimated.
Each page also carries a section on where the other service is genuinely better. That is not modesty, it is the point: a comparison that wins every row is an advert, and it is not much use to someone actually deciding.
Attested seva is a prayer performed at a place of worship on someone else's behalf by a named, verified person who returns evidence that it happened: GPS-tagged photographs, a short video, prayer audio where recording is permitted, and a handwritten note, usually the same day. Read the full definition, or see everything Sevahey cannot do.